[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Launchpad has imported 28 comments from the remote bug at https://bugzilla.gnome.org/show_bug.cgi?id=783569. If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. On 2017-06-08T19:17:14+00:00 Nicholas Stommel wrote: Created attachment 353426 fixes DNS leaks over some NM-VPN connections using systemd-resolved I have patched the Network Manager to fix DNS leaks over network-manger VPN links (like those created with network-manager-openvpn) when using systemd-resolved as the default dns-manger/resolver on Ubuntu. This addresses some critical security concerns with DNS leaks over NM-VPN links. Please see the following high-priority bug at launchpad: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317 There, I attached a patch for the current version of the network manager on Ubuntu 17.04 (1.4.4-1ubuntu3 zesty). Per request of kai.heng.f...@canonical.com on launchpad, I have patched the latest upstream source, made sure that it compiles correctly without warnings, and attached it here. So far, this is known to solve DNS leaks with network-manager-openvpn but could also solve DNS leaks for other VPNs that use TUN, TAP, or Cisco GRE network interfaces through the network-manager. It would be great to backport this fix to the current Ubuntu distribution! Reply at: https://bugs.launchpad.net/network- manager/+bug/1624317/comments/75 On 2017-06-09T07:51:45+00:00 Thomas Haller wrote: there is ipv4.dns-priority setting Quoting `man nm-settings`: "Intra-connection DNS priority. The relative priority to be used when determining the order of DNS servers in resolv.conf. A lower value means that servers will be on top of the file. Zero selects the default value, which is 50 for VPNs and 100 for other connections. Note that the priority is to order DNS settings for multiple active connections. It does not disambiguate multiple DNS servers within the same connection profile. For that, just specify the DNS servers in the desired order. When multiple devices have configurations with the same priority, the one with an active default route will be preferred. Note that when using dns=dnsmasq the order is meaningless since dnsmasq forwards queries to all known servers at the same time. Negative values have the special effect of excluding other configurations with a greater priority value; so in presence of at least a negative priority, only DNS servers from connections with the lowest priority value will be used." Why is that not the right solution? Reply at: https://bugs.launchpad.net/network- manager/+bug/1624317/comments/77 On 2017-06-09T08:07:38+00:00 Bgalvani wrote: Hi, in addition to what Thomas said, I think it is wrong to assume the connection is a VPN based on the link type, since you can have non-VPN tun/tap/gre/gretap connections as well, and they are affected by this patch. Also, it seems to me that commit [1] should already fix the leak for VPNs that don't get the default route... did you try if git master of NM is still affected by this bug? If it is, can you please attach the output of 'nmcli connection show ' for the VPN, and the output of 'systemd-resolve --status'? I mean, without your patch, to verify why the existing commit is not working. Thanks! [1] https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=c4864ba63f4a13e9938a978787490005f5ba48fb Reply at: https://bugs.launchpad.net/network- manager/+bug/1624317/comments/78 On 2017-06-09T16:30:24+00:00 Nicholas Stommel wrote: Oh, sorry I didn't think of that :/ I suppose that commit is a better fix. I'll see if that works instead. Reply at: https://bugs.launchpad.net/network- manager/+bug/1624317/comments/79 On 2017-06-09T21:07:27+00:00 Nicholas Stommel wrote: Created attachment 353487 current version of nm-systemd-resolved.c in Ubuntu network manager Wait...that commit from [1] is already found in the zesty version of network-manager 1.4.4-1ubuntu3. See attachment. This suggests that if this is still an issue on Ubuntu 17.04, the problem is still present and unsolved. [1] https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=c4864ba63f4a13e9938a978787490005f5ba48fb Reply at: https://bugs.launchpad.net/network- manager/+bug/1624317/comments/81 On 2017-06-09T21:58:24+00:00 Nicholas Stommel wrote: So the issue persists I believe. Unfortunately I just broke totally broke my
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Description changed: [Impact] - * NetworkManager incorrectly handles dns-priority of the VPN-like + * NetworkManager incorrectly handles dns-priority of the VPN-like connections, which leads to leaking DNS queries outside of the VPN into the general internet. - * Upstream has resolved this issue in master and 1.8 to correctly + * Upstream has resolved this issue in master and 1.8 to correctly configure any dns backends with negative dns-priority settings. - - [Test Case] - - #FIXME# - - * detailed instructions how to reproduce the bug - - * these should allow someone who is not familiar with the affected -package to reproduce the bug and verify that the updated package fixes -the problem. - - #FIXME# [Regression Potential] - * If this issue is changed DNS resolution will change, for certain + * If this issue is changed DNS resolution will change, for certain queries, to go via VPN rather than general internet. And therefore, one may get new/different results or even loose access to resolve/access certain parts of the interent depending on what the DNS server on VPN chooses to respond to. [Other Info] - - * Original bug report + + * Original bug report I use a VPN configured with network-manager-openconnect-gnome in which a split-horizon DNS setup assigns different addresses to some names inside the remote network than the addresses seen for those names from outside the remote network. However, systemd-resolved often decides to ignore the VPN’s DNS servers and use the local network’s DNS servers to resolve names (whether in the remote domain or not), breaking the split-horizon DNS. This related bug, reported by Lennart Poettering himself, was closed with the current Fedora release at the time reaching EOL: https://bugzilla.redhat.com/show_bug.cgi?id=1151544 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Bug watch added: bugzilla.gnome.org/ #783569 https://bugzilla.gnome.org/show_bug.cgi?id=783569 ** Changed in: network-manager Remote watch: GNOME Bug Tracker #783569 => bugzilla.gnome.org/ #783569 ** Bug watch removed: GNOME Bug Tracker #783569 https://gitlab.gnome.org/783569 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Bug watch removed: Red Hat Bugzilla #1151544 https://bugzilla.redhat.com/show_bug.cgi?id=1151544 ** Bug watch removed: github.com/systemd/systemd/issues #3421 https://github.com/systemd/systemd/issues/3421 ** Bug watch removed: GNOME Bug Tracker #746422 https://gitlab.gnome.org/746422 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Changed in: network-manager (Ubuntu Zesty) Status: Confirmed => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I'm not sure if setting negative priority really solves the dns leaks problem because I'm on 17.10 and I do have dns leaks. If I'm connected to my ISP over a LTE network and the connection is unstable then it could happen that DNS queries will be sent over my ISP network and not over my VPN connection. The only solution that works for me currently is sudo systemctl disable systemd-resolved.service sudo service systemd-resolved stop Put the following line in the [main] section of your /etc/NetworkManager/NetworkManager.conf: dns=default Delete the symlink /etc/resolv.conf rm /etc/resolv.conf Restart network-manager sudo service network-manager restart Caution! Be aware that disabling systemd-resolvd might break name resolution in VPN for some users - according to the original thread https://askubuntu.com/questions/907246/how-to-disable-systemd-resolved- in-ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
@bagl0312 I agree, there really should be some kind of GUI default way to set negative DNS priority when setting up certain VPN connections. The average user shouldn't experience a nasty surprise when DNS leaks happen by default. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hi, I confirm that with the command: sudo nmcli connection modify ipv4.dns-priority -42 there is not anymore DNS leakage. However I am wondering why this command is needed, why the fix released cannot include it by default ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Per former comments setting 17.10 to fix released. ** Changed in: network-manager (Ubuntu Artful) Status: Confirmed => Fix Released ** Changed in: network-manager (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Confirming is working again in 17.10 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
The issue I had either was this bug or something else, but somehow it's apparently working in 17.10. Basically, the domain(s) of the corporate vpn that I connect to resolve over the VPN again, while everything else resolves as usual. This worked fine in 16.10, was entirely broken in 17.04 and is back to working in 17.10. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
#103 did fix it Adding: [ipv4] dns-priority=-42 to system-connections config file or runing 'sudo nmcli connection modify ipv4.dns-priority -42' and restarting networkmanager service did fix dns leaking using ProtonVPN on openvpn for me, thanks. But i didn't quite understand the problem! Is it the provided openvpn config file misconfigured or a networkmanager bug? As i said, in others distros doesn't happend! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I'm not sure about split-horizon DNS, frankly I think that is a different bug entirely. However, I have had no problems with DNS leaks over my VPN connections whatsoever on Ubuntu 17.10. The bugfix I personally requested from the NM-devs and backported to Ubuntu 17.04 (running NetworkManager v1.4.x) was effectively just patching the negative dns-priority bug related to systemd-resolved. From 'man nm- settings': "Negative values have the special effect of excluding other configurations with a greater priority value; so in presence of at least a negative priority, only DNS servers from connections with the lowest priority value will be used." This means that DNS servers configured for the non-VPN connection will be 'unseated' and ONLY the VPN-configured DNS servers are used. Ubuntu 17.10 is running NetworkManager v1.8.4, so Thomas Haller's merged bugfix is present and working. You MUST use the command: 'sudo nmcli connection modify ipv4.dns-priority -42' or similar to actually set negative DNS priority for the VPN connection. Restart the network manager with 'sudo service network-manager restart', then connect to the VPN. Examine the output of 'systemd-resolved --status' and use the 'Extended' test on dnsleaktest.com to verify that you are not leaking DNS queries. I use openvpn, but setting negative dns priority should work for preventing DNS leaks over regular VPN connections of all kinds as a kind of 'catch-all'. Auto-connecting to openvpn through the GUI is a little troublesome in 17.10, but this 'fix' worked for me: https://askubuntu.com/questions/967408/how-to-automatically-connect-to-vpn-in-ubuntu-17-10/967415#967415 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
The corresponding GNOME bug has been marked fixed in https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=02d56ec87 that commit is in the 17.10 version, if that doesn't work then it's another issue or the upstream report should be reopened ** Changed in: network-manager (Ubuntu) Importance: Undecided => High ** Changed in: network-manager (Ubuntu Artful) Importance: Undecided => High ** Changed in: network-manager (Ubuntu Zesty) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
This bug still exists in Ubuntu 17.10 (ProtonVPN). In distros as Arch, Manjaro and Fedora it never happened. Is this going to 18.04 LTS as well?! Why no one cares? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Trying the above fix does not work for 17.10. This is highly unfortunate. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
It already looks like some kind of a tradition for ubuntu to break something critical in every single release and keep those bugs as long as possible. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I guess I'll have to go back to 16.04 or 16.10, despite someone providing a bugfix and several people confirming it, nobody from Ubuntu seems to care. Crazy, considering how much corporate employees depend on such BASIC features like this working. Very disappointing. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I can't even get vpn and/or socks5 to work. This is dangerous, perhaps it should be stressed that people shouldn't use 11.10 as a daily OS until this is fixed. I know, I know, me should know better. I'm just glad I checked before assuming I was in a secure tunnel. Otherwise 11.10 is working fine without any show stoppers for moi. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hi! There is a fix submitted as a patch i. The thread I have been using for a while. Works flawlessly for me. -- Securely sent with Tutanota. Claim your encrypted mailbox today! https://tutanota.com 13. Sep 2017 14:55 by 1624...@bugs.launchpad.net: > Does anyone know if this happens to be fixed in 17.10? I have little > hope that the fix is ever going to make into 17.04... > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1624317 > > Title: > systemd-resolved breaks VPN with split-horizon DNS > > Status in NetworkManager: > Unknown > Status in network-manager package in Ubuntu: > Confirmed > Status in network-manager source package in Zesty: > Confirmed > Status in network-manager source package in Artful: > Confirmed > > Bug description: > [Impact] > >* NetworkManager incorrectly handles dns-priority of the VPN-like > connections, which leads to leaking DNS queries outside of the VPN > into the general internet. > >* Upstream has resolved this issue in master and 1.8 to correctly > configure any dns backends with negative dns-priority settings. > > [Test Case] > > #FIXME# > >* detailed instructions how to reproduce the bug > >* these should allow someone who is not familiar with the affected > package to reproduce the bug and verify that the updated package fixes > the problem. > > #FIXME# > > [Regression Potential] > >* If this issue is changed DNS resolution will change, for certain > queries, to go via VPN rather than general internet. And therefore, > one may get new/different results or even loose access to > resolve/access certain parts of the interent depending on what the DNS > server on VPN chooses to respond to. > > [Other Info] > >* Original bug report > > I use a VPN configured with network-manager-openconnect-gnome in which > a split-horizon DNS setup assigns different addresses to some names > inside the remote network than the addresses seen for those names from > outside the remote network. However, systemd-resolved often decides > to ignore the VPN’s DNS servers and use the local network’s DNS > servers to resolve names (whether in the remote domain or not), > breaking the split-horizon DNS. > > This related bug, reported by Lennart Poettering himself, was closed with > the current Fedora release at the time reaching EOL: > > https://bugzilla.redhat.com/show_bug.cgi?id=1151544 > > To manage notifications about this bug go to: > https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Does anyone know if this happens to be fixed in 17.10? I have little hope that the fix is ever going to make into 17.04... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
#82 Helped me as well. And I'm 17.04... It'd be nice to see this fixed... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Can confirm: #82 does the trick. Thanks Nicholas, you're awesome! Let's hope this goes into 17.04 release or at least in zesty-updates. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
post #82 saved my day, no more dns leaks Note: getting here took my days -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I am so sick of bugs like this in Ubuntu. Every single time I upgrade I regret it. Is this going to be available anytime this century or do I need to learn to juggle configuration scripts? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
@ Nicholas Stommel (nstommel) Could you please help to update the bug description SRU template to fix this issue in 17.04? I do not fully understand the issue at hand, but I do have access to VPN and can set VPN setting in Netowrk Manager to route all traffic through VPN. After doing that, I should check dns-leak website?! to make sure all responses come from the VPN's DNS server rather than my ISP/public DNS servers? A write up of easy steps would be nice like: 1) check dns leak website, record dns servers 2) connect to vpn 3) check dns leak website again expected: servers in #3 should be behind vpn, and different from public dns servers listed in #1. Or some such. Would you be able to distill testcase steps into easy steps that anybody with a VPN connection setup via network manager can reproduce? This way we will be able to validate this issue and release a stable release update. ** Description changed: + [Impact] + + * NetworkManager incorrectly handles dns-priority of the VPN-like + connections, which leads to leaking DNS queries outside of the VPN into + the general internet. + + * Upstream has resolved this issue in master and 1.8 to correctly + configure any dns backends with negative dns-priority settings. + + [Test Case] + + #FIXME# + + * detailed instructions how to reproduce the bug + + * these should allow someone who is not familiar with the affected +package to reproduce the bug and verify that the updated package fixes +the problem. + + #FIXME# + + [Regression Potential] + + * If this issue is changed DNS resolution will change, for certain + queries, to go via VPN rather than general internet. And therefore, one + may get new/different results or even loose access to resolve/access + certain parts of the interent depending on what the DNS server on VPN + chooses to respond to. + + [Other Info] + + * Original bug report + I use a VPN configured with network-manager-openconnect-gnome in which a split-horizon DNS setup assigns different addresses to some names inside the remote network than the addresses seen for those names from outside the remote network. However, systemd-resolved often decides to ignore the VPN’s DNS servers and use the local network’s DNS servers to resolve names (whether in the remote domain or not), breaking the split-horizon DNS. This related bug, reported by Lennart Poettering himself, was closed with the current Fedora release at the time reaching EOL: https://bugzilla.redhat.com/show_bug.cgi?id=1151544 ** Changed in: network-manager (Ubuntu Zesty) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Also note artful has 1.8.0, thus this fix may be included there already, or e.g. will only need a simple git cherry-pick of the upstream 1.8 branch fix. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** No longer affects: systemd (Ubuntu) ** No longer affects: systemd (Ubuntu Artful) ** Project changed: systemd => network-manager ** Changed in: network-manager Importance: Undecided => Unknown ** Changed in: network-manager Status: New => Unknown ** Changed in: network-manager Remote watch: None => GNOME Bug Tracker #783569 ** Also affects: network-manager (Ubuntu Zesty) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/network-manager/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Will this fix be released for 17.04 ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I can also confirm that the latest patch fixes the problem. Thank you very much for your work! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
@Stephan the Penguin god has not forsaken us, my friend :D So glad it works for you guys, thanks for the nice feedback! This issue bugged me so much I sorta made it my mission haha. It's fantastic I finally got this thing sorted out with some help from the Gnome NM devs :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
@Nicholas Stommel THANKS THANKS THANKS Hell it works !!! Oh dear Penguin god, I was almost close to install fedora or sth else. I owe you a beer ! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hello Nicholas, just tested the solution proposed in post #82. My configuration is ubuntu-gnome 17.04 lsb_release -a: No LSB modules are available. Distributor ID: Ubuntu Description:Ubuntu 17.04 Release:17.04 Codename: zesty uname -a: Linux 4.10.0-24-generic #28-Ubuntu SMP Wed Jun 14 08:14:34 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux The solution seems to work. I have a working DNS tested with several openvpn configuration files and server (tested nordvpn + other personal VPNs). No DNS leakage is observed anymore Thanks for your work! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Please test with the new patch or patched .deb and follow the steps to set negative ipv4 dns-priority. I (and lead NM-dev Thomas Haller himself) believe this resolves the bug. Thanks, and I hope this helps you all! :) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
After setting the ipv4.dns-priority of the VPN connection to a negative number and patching the source or installing the conveniently packaged .deb below, you should not experience DNS leaks over NM-VPN. (Output from extended test at https://dnsleaktest.com ) Test complete Query round Progress... Servers found 1 .. 1 2 .. 1 3 .. 1 4 .. 1 5 .. 1 6 .. 1 IP HostnameISP Country 173.239.226.69 ip-69-226-239-173.east.us.northamericancoax.com LogicWeb Inc United States To install the .deb package, simply use: cd ~/Downloads && sudo dpkg -i network-manager_1.4.4-1ubuntu4_amd64.deb NOTE: make sure apt does not replace the package with: sudo apt-mark hold network-manager Make sure to stop all network services and restart the network manager using: sudo service network-manager stop sudo service networking restart sudo service network-manager start To build the source and apply the patch yourself, use the following steps: sudo apt-get build-dep network-manager cd ~/Downloads && mkdir nm-patch && cd nm-patch apt-get source network-manager cd network-manager-1.4.4 cp ~/Downloads/systemd-resolved-dns-priority-fix.patch . patch -p1 < systemd-resolved-dns-priority-fix.patch rm systemd-resolved-dns-priority-fix.patch dpkg-buildpackage -us -uc -b (wait a while, it will take some time to compile) Then install the generated network-manager_1.4.4-1ubuntu .deb package using: cd ../ && sudo dpkg -i ** Attachment added: "network-manager_1.4.4-1ubuntu4_amd64.deb" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4900613/+files/network-manager_1.4.4-1ubuntu4_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I have successfully backported Thomas Haller's excellent upstream solution as detailed in https://bugzilla.gnome.org/show_bug.cgi?id=783569 This took some time as things have changed quite a bit upstream, but the patch works on the current zesty 17.04 1.4.4-1ubuntu3.1 network-manager! This is a much better fix than the stopgap SetLinkDomains "." bus call based on link type I included in the previous patch. It should be reviewed for current application/submission to the package maintainers as it is basically a direct backport of Haller's fix merged upstream. NOTE: You MUST set the ipv4.dns-priority to a negative number for the network-manager to unseat DNS configurations for other non-VPN interfaces. This patch allows for correct behavior with negative ipv4 .dns-priority: "Negative values have the special effect of excluding other configurations with a greater priority value; so in presence of at least a negative priority, only DNS servers from connections with the lowest priority value will be used." Usage of a negative dns-priority disables DNS configuration for all other interfaces, ensuring there are no DNS leaks over a VPN connection using systemd-resolved. Before Haller's bugfix, this feature did not work with systemd-resolved. To set the ipv4.dns-priority, open the VPN connection profile you have configured through NM like so: sudo nano /etc/NetworkManager/system-connections/ and adding the line (value of -42 recommended by Haller) "dns-priority=-42" so that the file contains something like: [ipv4] dns-priority=-42 dns-search= method=auto Alternatively, use the command sudo nmcli connection modify "" ipv4.dns-priority -42 And you should see that the config file for that connection contains the same line as shown above. After doing so and patching/installing the patched network manager, you should not experience DNS leaks. When I am connected to PIA's servers through network-manager-openvpn using the patched network manager and a negative ipv4.dns-priority set for my VPN connection, the output of systemd-resolved looks like this (notice that the Verizon ISP DNS server was 'unseated' and is absent for the primary wireless link wlo1): Global DNSSEC NTA: 10.in-addr.arpa ...(long list of NTAs omitted)... test Link 4 (tun0) Current Scopes: DNS LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 209.222.18.222 209.222.18.218 Link 2 (wlo1) Current Scopes: LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no If anyone is curious about support for the routing-only domain in NM, see the following bug https://bugzilla.gnome.org/show_bug.cgi?id=746422 which is about adding support for routing-only domains for systemd- resolved (still work in progress). ** Bug watch added: GNOME Bug Tracker #746422 https://bugzilla.gnome.org/show_bug.cgi?id=746422 ** Patch added: "systemd-resolved-dns-priority-fix.patch" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4900587/+files/systemd-resolved-dns-priority-fix.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hey all, so it seems like Thomas Haller at the bug thread https://bugzilla.gnome.org/show_bug.cgi?id=783569 may have actually fixed this issue upstream! Not sure how to backport the fix though, I tried and didn't have any luck, so this may be up to the package maintainers. I think this might actually be fixed though! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I was encountering DNS issues on Ubuntu 17.04 using OpenVPN. Your patched NetworkManager worked for me Nicholas. Thank you ! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Unfortunately my patch is not a good solution for upstream application. I agree with what Beniamino Galvani mentioned, that "it is wrong to assume the connection is a VPN based on the link type, since you can have non-VPN tun/tap/gre/gretap connections as well, and they are affected by this patch." However, it seems that this issue with DNS leaks over NM-VPN connections and broken VPN split-horizon DNS using systemd-resolved still exists upstream and doesn't have a good fix. I think this issue needs some attention and work from the Gnome- NM/systemd/Canonical devs, I've reached my limit here. :( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Actually I take that back. The issue is not fixed by the commit referenced on https://bugzilla.gnome.org/show_bug.cgi?id=783569 as it is already present in the current version of the network-manager. So we still have a major problem folks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Changed in: systemd (Ubuntu) Assignee: (unassigned) => Dimitri John Ledkov (xnox) ** Also affects: network-manager (Ubuntu Artful) Importance: Undecided Status: Confirmed ** Also affects: systemd (Ubuntu Artful) Importance: High Assignee: Dimitri John Ledkov (xnox) Status: Confirmed ** Tags removed: rls-aa-incoming -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
My apologies, it seems like this issue could have already been addressed upstream. See https://bugzilla.gnome.org/show_bug.cgi?id=783569 Anyway, I'll see if I can backport the fix provided there and whether or not it works. Sorry guys :/ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I have upstreamed the patch at https://bugzilla.gnome.org/show_bug.cgi?id=783569 ! Hopefully this can be incorporated into future releases of network-manager :) ** Bug watch added: GNOME Bug Tracker #783569 https://bugzilla.gnome.org/show_bug.cgi?id=783569 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
If that's the case, would you mind to upstream the patch? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
No, it's not an upstream patch. My patch can be applied directly to the current source on 17.04 obtained using 'apt-get source network-manager', so that would be network-manager 1.4.4-1ubuntu3 from http://us.archive.ubuntu.com/ubuntu zesty/main amd64 Packages -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Nicholas, does the patch come from upstream? We should backport the patch into Ubuntu's NM properly, so everyone can benefit. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
In reference to John Bedford's comment: >bedfojo (commercial-johnbedford) wrote on 2017-06-06: #57 >Nicholas, thank you very much for your work on this patch. >It works correctly for me: no DNS leak detected by either https://ipleak.net >or >https://dnsleaktest.com for me, when both detected leaks in the unpatched >version. >Running Ubuntu-MATE 17.04. >Could we perhaps get this upstreamed into NM? >bedfojo (commercial-johnbedford) wrote on 2017-06-06: #58 >I should add that I'm using network-manager-openvpn and >network-manager-openvpn-gnome. I think it would be great if we could get this patch upstreamed into the network-manager! I've attached a finalized version of the patch with a more informative / verbose syslog message that also accounts for cisco gre/gretap connections not in #49. Please use this patch when building network-manager for Ubuntu 17.04. I will also attach a .deb build of network-manager for easy installation and testing for anyone interested. So far, this is known to solve dns leaks with network-manager-openvpn but could also solve dns leaks for other VPNs that use TUN, TAP, or Cisco GRE network interfaces through the network-manager. You should now see a message in your syslog when connecting that looks like the following: NetworkManager[32636]: [1496880041.6435] systemd-resolved[0x55cc602ce430]: Link #12 type is VPN TUN or TAP, fixing DNS leak... Make sure to stop apt from replacing the patched .deb using: sudo apt-mark hold network-manager To verify that you are using the 'routing-only domain', use the command systemd-resolve --status and look for the line "DNS Domain: ~." under the VPN link number. Alternatively, check that you are not experiencing DNS leaks using the 'extended test' on https://dnsleaktest.com/ Cheers :) ** Patch added: "resolved-vpn-dns-leak-fix.patch" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4891740/+files/resolved-vpn-dns-leak-fix.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Attachment added: "patched network-manager .deb for easy testing on Ubuntu 17.04" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4891741/+files/network-manager_1.4.4-1ubuntu4_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Patch removed: "patch for network-manager source" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4889747/+files/resolved-vpn-dns-leak-fix.patch ** Patch removed: "possible cisco network-manager-openconnect-fix" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4890352/+files/resolved-vpn-dns-leak-fix.patch ** Attachment removed: "patched network manager .deb for easy fix installation on Ubuntu 17.04" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4889755/+files/network-manager_1.4.4-1ubuntu3_amd64.deb ** Attachment removed: "updated patched .deb packaged network-manager for easy testing" https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1624317/+attachment/4890421/+files/network-manager_1.4.4-1ubuntu3_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Huh, weird, yeah it's quite possible it's a different issue entirely, or a problem related to network-manager-openconnect. Because the routing- only domain is clearly listed as DNS Domain ~. so systemd-resolved should only send queries to the specified dns servers for the interface vpn0. Yeah...not sure sorry. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
The DNS servers have always been listed under the vpn0 link when I run systemd-resolve --status, even before your patch. I still get no internal network name resolution, even when hard coding the DNS servers in network manager. Maybe I've got a different issue than what others are seeing, but I have confirmed that on 16.10 the vpn works correctly, resolves internal names, and doesn't leak, but on 17.04 it no longer works. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Huh. No, actually my patch DID work. See the line under vpn0 that says DNS Domain: ~. So the correct bus call was made and all dns queries SHOULD be directed to the link-specified listed DNS servers. Your problem actually appears to be that there are no link-specified dns servers. See the line that says DNS Servers: Please try manually specifying the correct DNS servers in the network-manager-openconnect gui settings. That should fix your problem I believe. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Thanks for taking your time to work though this. My link name is vpn0 Link 3 (vpn0) Current Scopes: DNS LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: DNS Domain: ~. Link 2 (enp30s0) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 192.168.1.1 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Tim, I have a question for you. When you connect through network-manager-openconnect-gnome, and type systemd-resolve --status, what is your link name called? Something like 'tun0' or 'tap1' or the like? Because I've been looking around at the openconnect wiki at http://www.infradead.org/openconnect/building.html, and it seems like openconnect requires tun/tap drivers. So theoretically, it should have worked with the original patch containing just the conditional expression: if (link_type == NM_LINK_TYPE_TUN || link_type == NM_LINK_TYPE_TAP) As in, this should evaluate to true as the link should be of type tun or tap. It seems like the updated patch containing the conditional expression if (link_type == NM_LINK_TYPE_TUN || link_type == NM_LINK_TYPE_TAP || link_type == NM_LINK_TYPE_GRE || link_type == NM_LINK_TYPE_GRETAP) might, however, help address users of network-manager-vpnc/network-manager-vpnc-gnome. If anyone uses network-manager-vpnc/network-manager-vpnc-gnome, let me know if the newer patch containing the cases for NM_LINK_TYPE_GRE and NM_LINK_TYPE_GRETAP fixes DNS leaks for you on a Cisco PPTP/IPsec VPN. I am unable to test this out as I don't have access to any such Cisco VPN services. Anyway, if the network manager doesn't correctly register the openconnect interface as being link type TUN or TAP, I don't really know how to fix it as that could be a problem on network-manager- openconnect's end or the result of some way it doesn't properly notify the network manager. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Jordi, Sure thing, glad I could help. :) I wonder if somebody can figure out how to help Tim with network-manager-openconnect. I tried adding two more conditions for cisco vpn gre connections but apparently it didn't work or those aren't the kind of links used. Not sure how to address that because the innards of network-manager and how it interacts with plugins is fairly complex, but maybe someone could modify the patch to account for that. For anyone just using network-manager-openvpn, the first patch and .deb uploaded are all that is needed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hi Nicholas, I upgraded to 17.04, installed your patch and I can now say that dns leaks when using network-manager-openvpn + network-manager-openvpn-gnome are gone for good now. Awesome work, thanks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Sorry to here that, I'm frankly not sure what to do about that then :/ At the very least the original patch fixes stuff for openvpn, which is good. Perhaps someone else could figure out the cisco openconnect thing. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Maybe I'm doing something wrong, but I installed the deb, and even did a full reboot, and I'm still leaking my personal IP in the DNS leak test, and am still unable to ping servers on the inside of the VPN network when connected to the ANY connect VPN. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Anyone using Cisco PPTP/IPsec/openconnect VPN, please test the network manager with the aforementioned patch or with the updated built .deb provided here. The updated patch should address more types of VPN links. Thanks! ** Attachment added: "updated patched .deb packaged network-manager for easy testing" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624317/+attachment/4890421/+files/network-manager_1.4.4-1ubuntu3_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Tim Shannon, from the comment about network-manager-openconnect-gnome, please use this updated patch to build the network manager. I added conditions for the cisco GRE and GRETAP link types, see https://en.wikipedia.org/wiki/Generic_Routing_Encapsulation and http://www.cisco.com/c/en/us/td/docs/security/security_management/cisco_security_manager/security_manager/4-4/user/guide/CSMUserGuide_wrapper/vpgredm.html#69194 so I think this might fix the issue connecting through network-manager-openconnect-gnome Please build the network-manager with the following patch and see if DNS leaks are fixed over cisco openconnect VPN links. Thanks! ** Patch added: "possible cisco network-manager-openconnect-fix" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624317/+attachment/4890352/+files/resolved-vpn-dns-leak-fix.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I should add that I'm using network-manager-openvpn and network-manager- openvpn-gnome. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Yeah, apologies as I'm not sure what link type that openconnect uses / how to identify an openconnect link. It would be a simple matter to add a conditional for that in the file I patched, please try that. For now my patch only addresses openvpn tap or tun links, but I'm sure it could be expanded if possible. Anyone using network-manager-openvpn please test. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Nicholas, thank you very much for your work on this patch. It works correctly for me: no DNS leak detected by either https://ipleak.net or https://dnsleaktest.com for me, when both detected leaks in the unpatched version. Running Ubuntu-MATE 17.04. Could we perhaps get this upstreamed into NM? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Not working for me, but I assume that's because I'm using network- manager-openconnect-gnome? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hi! Thanks for the patch Nicholas. I will upgrade to 17.04, test it and report back tonight or tomorrow at most. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
>From the Debian man pages, it seems like this is not in fact a problem of systemd itself, as it allows for domain routing exclusively for dns servers on a single interface using the routing-only domain. My patch effectively just tells the NetworkManager to make a systemd bus call for the routing-only domain when the connection is a vpn tun or tap link. In fact, this feature of systemd, the routing-only domain, is a marked improvement from the glibc API, which has no equivalent concept of dns servers limited to a system link. The SetLinkDomains method of the systemd-resolved API allows for this behavior. >From SYSTEMD.NETWORK(5): "The "routing-only" domain "~." (the tilde indicating definition of a routing domain, the dot referring to the DNS root domain which is the implied suffix of all valid DNS names) has special effect. It causes all DNS traffic which does not match another configured domain routing entry to be routed to DNS servers specified for this interface. This setting is useful to prefer a certain set of DNS servers if a link on which they are connected is available. This setting is read by systemd-resolved.service(8). "Search domains" correspond to the domain and search entries in resolv.conf(5). Domain name routing has no equivalent in the traditional glibc API, which has no concept of domain name servers limited to a specific link." -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I can confirm this works for multiple vpn connections and after wakeup from system suspend on Ubuntu 17.04. I encourage you to install the patched .deb or follow the instructions to build it from source and see for yourself. I'm honestly so glad this fixes dns leaks for using openvpn through the network manager gui on Ubuntu that I'm switching my primary machine to 17.04. :) Please let me know if this resolves your problems with DNS leaks using a vpn via the network manager. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
The attachment "patch for network-manager source" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team. [This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.] ** Tags added: patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
The actual patch is attached above and can be applied to the source code which you can build yourself. But for your convenience, I have attached the .deb file below: ** Attachment added: "patched network manager .deb for easy fix installation on Ubuntu 17.04" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624317/+attachment/4889755/+files/network-manager_1.4.4-1ubuntu3_amd64.deb -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Please note that this patch and fix only works for Ubuntu 17.04 which relies on systemd-resolved as a DNS/DNSSEC stub resolver, as well as an LLMNR resolver. You also need to be using a network-manager plugin like network-manager-openvpn-gnome. Install and configure an openvpn connection after going 'sudo apt-get install network-manager- openvpn-gnome', importing a config file, connecting (if possible), and observing the fact that there are DNS leaks (queries WILL be routed to your ISP) with online tools like those at https://dnsleaktest.com. Otherwise, just know that systemd-resolved naturally leaks DNS queries over all configured domains on all interfaces by design unless a specific system bus call is made. In this case, the SetLinkDomains(in i ifindex, in a(sb) domains) method, if passed the interface index followed by an array containing the "routing-only" domain "~." (see https://manpages.debian.org/testing/systemd/systemd.network.5.en.html) and the boolean true. But enough with the technical details, lets move on to the fix! First, make sure you have all necessary packages to build the network manager, install with: sudo apt update sudo apt-get build-dep network-manager cd ~/Documents mkdir nm && cd nm apt-get source network-manager cd network-manager-1.4.4/ Copy the patch file into the network-manager-1.4.4 directory: cp ~/Downloads/resolved-vpn-dns-leak-fix.patch . Apply the patch with: patch -p1 < resolved-vpn-dns-leak-fix.patch Remove patch from source directory before compilation: rm resolved-vpn-dns-leak-fix.patch Compile and build .deb package for installation (this will take a while): dpkg-buildpackage -us -uc -b The compiled .debs should be in the parent directory you created nm: cd ../ First, stop all network services: sudo service network-manager stop sudo service networking stop Install just the patched network manager (the other .debs are not necessary): sudo dpkg -i network-manager_1.4.4-1ubuntu3_amd64.deb Bring network services back up: sudo service networking start sudo service network-manager start Connect to standard openvpn via network-manager-openvpn GUI (or other plugin) Search the syslog for something like: NetworkManager[876]: [1496716774.9849] systemd-resolved[0x55b0132ec2b0]: Link type is VPN TUN or TAP, fixing DNS leak... and verify that the VPN link (for example tun0) includes the descriptor: DNS Domain: ~. using the command: systemd-resolve --status When compiling network manager, several bogus links are created and will show up when you type 'systemd-resolve --status', don't worry they will disappear once you reboot. Then open your browser, navigate to https://dnsleaktest.com and select Extended test You should only see your VPN provider's DNS servers. For example, with PIA you should see something like: Test complete Query round Progress... Servers found 1 .. 1 2 .. 1 3 .. 1 4 .. 1 5 .. 1 6 .. 1 IP HostnameISP Country 173.239.220.5 ip-5-220-239-173.east.us.northamericancoax.com GoLightSpeed United States Now, to prevent Ubuntu apt from replacing your patched, VPN-DNS-leak- free version of network manager that relies on systemd-resolved, use the command: sudo apt-mark hold network-manager Thats all, you're done. Congrats, no DNS leaks on Ubuntu 17.04! I hope that I was able to make your life easier and more secure using openvpn or other vpn services through the built-in GUI for the Gnome NetworkManager on Ubuntu 17.04 :) (Side note: I am a college student and C/C++ dev who loves Ubuntu <3 Also, this took quite a bit of research on the GLib API, systemd-resolved API, and much much tracing using our good friend 'grep -r' for built in functions and enums of the Gnome network manager itself. No additional compiler warnings are generated, the patch conforms to the C90 standard, and the syntax style used throughout the network manager source code was maintained.) I will attach the small text patch generated using 'diff -u' along with the patched generated .deb file for your convenience. Cheers, and I hope this helps you all! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Patch added: "patch for network-manager source" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624317/+attachment/4889747/+files/resolved-vpn-dns-leak-fix.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Also affects: network-manager (Ubuntu) Importance: Undecided Status: New ** Changed in: network-manager (Ubuntu) Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
** Tags added: rls-aa-incoming -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
@Vincent, re the "If lookups are routed to multiple interfaces, the first successful response is returned", this is indeed the problem with systemd-resolved as I see it, as that method will never be stable for a split DNS setup... You can never reliably predict if you'll get a good or a bad IP for the connections you're currently using. dnsmasq allows a solution to this, because NetworkManager can tell dnsmasq to use the LAN DNS for default stuff, but use the VPN DNS for lookups in the example.lan domain and 10.in-addr.arpa, for example. The dhcp-options you mention is for a direct call to openvpn if I'm not mistaken(?). That would work if you're content with launching every VPN connection by hand. In my case, I use a bunch of different VPN clients and as such, solving this in NetworkManager is a much more universally applicable fix. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
To clarify... I believe NetworkManager is the culprit here - or systemd- resolved is fundamentally broken (i don't have the working knowledge to guess which it is). So my comment #44 is more about getting a working system than addressing any issue with systemd and/or NetworkManager. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Thomas: I am not an expert on this, but as far as I can tell from the documentation you are seeing a different dns replying at times because (I quote the systemd.resolved.service doc) "Multi-label names are routed to all local interfaces that have a DNS sever configured (...) If lookups are routed to multiple interfaces, the first successful response is returned". So basically all the dns servers defined in all of your links are fair game. DNS requests are sent to all of them at the same time and whichever replies first win the day! My understanding is that you have to specify dhcp-options DOMAIN-ROUTE . in your openvpn connection settings to force dns requests to all domains to go through the vpn link and ignore the dns on other links. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
So I have come up with a working solution that actually solves all MY needs in this regard. Hopefully it will be of use or inspiration to some of you guys too... Part 1 -- Switch NetworkManager to use dnsmasq (this will NOT work with resolved!) # apt-get install dnsmasq-base Add dns=dnsmasq to /etc/NetworkManager/NetworkManager.conf [main] section # systemctl disable systemd-resolved # systemctl stop systemd-resolved # systemctl restart network-manager Part 2 -- Modify VPN configuration (in /etc/NetworkManager/system-connections) DNS, Routes and reverse IP for the VPN networks can be tricked to work by modifying the [ipv4] section of the VPN configuration file: dns-search=example.lan;example2.lan;example.net # <-- make sure dns requests for these domains and all subdomains are sent to the VPN DNS servers, allowing the split DNS to work never-default=true # <-- make sure the VPN will not be made the default route ignore-auto-routes=true # <-- if you want to manually select the routes route1=192.168.1.0/24 # <-- sets up a route - with reverse dns forwarding to the vpn dns server for network 1 route2=192.168.2.0/24 # <-- sets up a route - with reverse dns forwarding to the vpn dns server for network 2 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I'm on 17.04 too and suffering from this issue for a while. As I understand this issue, the problem may actually very well be in Network-Manager rather than in systemd-resolved, but the problem is indeed very visible with resolved. Here's how I experience the problem (the root of my problems are a split DNS setup, just like most other people following this ticket). This is the state of my resolved... With no VPN connected (wireless and wifi only): Link 7 (vpn0) Current Scopes: none LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no Link 3 (wlp4s0) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 192.168.8.1 DNS Domain: int.example.com Link 2 (enp0s31f6) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 192.168.8.1 DNS Domain: int.example.com With VPN connected: Link 7 (vpn0) Current Scopes: DNS LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 192.168.180.48 192.168.180.49 DNS Domain: example.lan Link 3 (wlp4s0) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 192.168.8.1 DNS Domain: int.example.com Link 2 (enp0s31f6) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 LLMNR setting: yes MulticastDNS setting: no DNSSEC setting: no DNSSEC supported: no DNS Servers: 192.168.8.1 DNS Domain: int.example.com Now, I have one split DNS entry, testserver.example.net. On a public DNS, it will resolve to a public IP - On the example.lan DNS servers, it will resolve to a private IP. Doing the following a couple of times is bound to sometimes return the private IP and sometimes the public IP: systemd-resolve --flush-caches && ping -c1 testserver.example.net So for things to work in this particular example, I'd need the 192.168.8.1 DNS to either be disabled completely or only used for int.example.com. 192.168.180.48 and 49 as provided by the VPN would somehow need to be the default/active nameserver. Note that for my VPN connection in Network Manager, I've *not* enabled the "use this connection only for resources on its own network". In an attempt to work around this problem, I decided to configure network-manager for dnsmasq, which worked fine back in the 16.04 days. Basically the setup worked, but Network-Manager only added the VPN DNS servers for the VPN provided search domain example.lan. Needless to say this works even worse than the resolved solution, because now I get the wrong answer for testserver.example.net every time. It does seem to indicates that perhaps there's something fishy about how network-manager passes DNS servers to resolved. I have not found a way to force network- manager to completely replace the configured DNS servers for a VPN connection, but that might provide a usable workaround. Hopefully this can shed some light on things? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Here is a solution that seems to work for me. Note that I use a simple openvpn client configuration file that I run directly from the console. I don't use a GUI for my vpn connection, but I assume you can do the same via a gui interface. Within my openvpn client config file, I call a script called update- systemd-resolved as a replacement to the standard update-resolv-conf used previously. That script is available here: https://github.com/jonathanio/update- systemd-resolved After that, after connecting, when I run systemd-resolve --status I can see that a new link is added for tun0 with the proper dns entries. But that's only a first step, because it seems that with systemd.resolved.service (I quote) "Multi-label names are routed to all local interfaces that have a DNS sever configured (...) If lookups are routed to multiple interfaces, the first successful response is returned". So basically it's still sending requests on all interfaces, including the main eth0 or whatever it is on your system, and the fastest one wins (in my case because eth0 points to my router that acts as a dns server, it always wins). To avoid leaks, we want only requests to go to the tun0 link. Then I read that "Routing of lookups may be influenced by configuring per-interface domain names". If you read the instructions in the update-systemd-resolved, you'll see that it allows to specify dhcp- options DOMAIN-ROUTE to force a specific domain to go through that interface. You can use a single dot to mean all domains. So basically I added dhcp-option DOMAIN-ROUTE . to my clienf config to send everything exclusively to tun0 and that seems to do the trick. So combined with the instructions from the github page, this is what I have on my config: # avoid dns leak when using systemd-resolved dhcp-option DOMAIN-ROUTE . script-security 2 setenv PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin up /etc/openvpn/update-systemd-resolved down /etc/openvpn/update-systemd-resolved down-pre -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Hi, I have been posting quite a bit of information on bug https://bugs.launchpad.net/ubuntu/+source/openvpn/+bug/1652525 As I didn't really realize there was this one open too, sorry. Maybe something is going to be useful for you. Cheers, J -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Yeah, setting the nameserver in /etc/resolve.conf doesn't seem to work for me either. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
Re: [Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
You can still add the vpn nameserver to /etc/resolv.conf . Epic blunder by both systemd-resolv maintainer and Ubuntu packagers for stacking a broken configuration together for at the 3rd release. Does anyone know how to escalate this? On May 4, 2017 19:04, "Winckler"wrote: > It's a really ugly workaround, but I'm using iptables to block > connections to my ISP's DNS. I manually create and remove iptables rules > using a script but at least this allows me to work remotely. I hope this > get fix soon. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1624317 > > Title: > systemd-resolved breaks VPN with split-horizon DNS > > Status in systemd: > New > Status in systemd package in Ubuntu: > Confirmed > > Bug description: > I use a VPN configured with network-manager-openconnect-gnome in which > a split-horizon DNS setup assigns different addresses to some names > inside the remote network than the addresses seen for those names from > outside the remote network. However, systemd-resolved often decides > to ignore the VPN’s DNS servers and use the local network’s DNS > servers to resolve names (whether in the remote domain or not), > breaking the split-horizon DNS. > > This related bug, reported by Lennart Poettering himself, was closed > with the current Fedora release at the time reaching EOL: > https://bugzilla.redhat.com/show_bug.cgi?id=1151544 > > To manage notifications about this bug go to: > https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
It's a really ugly workaround, but I'm using iptables to block connections to my ISP's DNS. I manually create and remove iptables rules using a script but at least this allows me to work remotely. I hope this get fix soon. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Yeah currently none of the workaround mentioned in the previous comments seem to work at all for me on 17.04. Not sure what to do at this point. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
indeed, this is COMPLETELY broken on 17.04. It seems systemd-resolved is the only thing being used. My DNS resolving over anyconnect (openconnect) does not work AT ALL anymore. I don't know which brilliant mind decided to change things like that, knowing there are so many bugs open. any work arounds known are greatly appreciated (disabling systemd- resolved did not help) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I dup'ed another bug onto this, as I think they are essentially the same. While Martin worked on the domain-restricted cases the reporter and others outlined that this is not what this bug is about. TL;DR: - anything (like vpn) provides new DNS servers on an extra link - lets call them "internal" and "external" sources of DNS info - systemd-resolved asks ALL local interfaces concurrently and takes the fastest answer - now we have two breaking use cases: - if "internal" and "external" are intentionally configured to report differently (override a DNS name to internal host) you can no more rely on getting the internal resolution - by asking "external" even if "internal" holds an answer is a dns leak as in [1] At least for the VPN cases - and most here seem to be that - what we would need is a way to "disable" the DNS resolving on the original interface. >From man systemd-resolved: Multi-label names are routed to all local interfaces that have a DNS sever configured, plus the globally configured DNS server if there is one. [...] If lookups are routed to multiple interfaces, the first successful response is returned (thus effectively merging the lookup zones on all matching interfaces). If the lookup failed on all interfaces, the last failing response is returned. >From the bug I dupped we have the output of $ systemd-resolve --status (There is also tcpdump data there) Both confirms that is lists all links and their DNS Link 4 (tun0) Current Scopes: DNS [...] DNS Servers: 209.222.18.222 209.222.18.218 Link 3 (wlp3s0) Current Scopes: DNS LLMNR/IPv4 LLMNR/IPv6 [...] DNS Servers: 192.168.0.1 Combined with the concurrent-quere-prefer-first behavior above that might be the root cause for all or most of the people chiming in here. [1]: https://www.dnsleaktest.com/ ** Changed in: systemd (Ubuntu) Importance: Medium => High ** Tags added: zesty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Stephan, it is response time dependent - if your campus has a slow DNS answer then the others e.g. on your normal uplink will be preferred. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Same problem here with Ubuntu 17.04 on 2 computers. Strange thing is, my private VPN pptp connection with my campus does not use their dns...the paid VPN (Cyberghost) works fine. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Do someone plan to fix this issue? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Maybe this is related? https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1667825 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Is this the "Additional DNS servers" and "Additional search domains" IPv4 settings? Basically, while my VPN is enabled I want to use specific a DNS server behind the VPN, but only to resolve (sub)domains underneath that search domain. This used to work for me in 16.10 and is now broken in 17.04. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Confirmed that is still an issue on 17.04. Comment #20 doesn't work, as that line does not exist. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Same problem here, using vpnc, Ubuntu 16.04.2. Workaround #20 did the job. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I can confirm that using the workaround in #6 makes the VPN operable again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Sorry, I mean in comment #20! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Here is my output for @piti: Positive Trust Anchors: . IN DS19036 8 2 49aac11d7b6f6446702e54a1607371607a1a41855200fd2ce1cdde32f24e8fb5 Negative trust anchors: 10.in-addr.arpa 16.172.in-addr.arpa 17.172.in-addr.arpa 18.172.in-addr.arpa 19.172.in-addr.arpa 20.172.in-addr.arpa 21.172.in-addr.arpa 22.172.in-addr.arpa 23.172.in-addr.arpa 24.172.in-addr.arpa 25.172.in-addr.arpa 26.172.in-addr.arpa 27.172.in-addr.arpa 28.172.in-addr.arpa 29.172.in-addr.arpa 30.172.in-addr.arpa 31.172.in-addr.arpa 168.192.in-addr.arpa corp home internal intranet lan local private test Using system hostname 'Thinkpad-T440s'. New scope on link *, protocol dns, family * Found new link 3/wlan0 Found new link 2/eth0 Found new link 1/lo New scope on link eth0, protocol llmnr, family AF_INET6 Excercising transaction 8616 for on scope llmnr on eth0/AF_INET6. Delaying llmnr transaction for 4242us. New scope on link eth0, protocol llmnr, family AF_INET Excercising transaction 28149 for on scope llmnr on eth0/AF_INET. Delaying llmnr transaction for 51982us. Sent message type=method_call sender=n/a destination=org.freedesktop.DBus object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=Hello cookie=1 reply_cookie=0 error=n/a Got message type=method_return sender=org.freedesktop.DBus destination=:1.128 object=n/a interface=n/a member=n/a cookie=1 reply_cookie=1 error=n/a Sent message type=method_call sender=n/a destination=org.freedesktop.DBus object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=RequestName cookie=2 reply_cookie=0 error=n/a Got message type=method_return sender=org.freedesktop.DBus destination=:1.128 object=n/a interface=n/a member=n/a cookie=4 reply_cookie=2 error=n/a Sent message type=method_call sender=n/a destination=org.freedesktop.DBus object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=AddMatch cookie=3 reply_cookie=0 error=n/a Got message type=method_return sender=org.freedesktop.DBus destination=:1.128 object=n/a interface=n/a member=n/a cookie=5 reply_cookie=3 error=n/a Switching to system DNS server 127.0.1.1. Got message type=signal sender=org.freedesktop.DBus destination=:1.128 object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=2 reply_cookie=0 error=n/a Got message type=signal sender=org.freedesktop.DBus destination=:1.128 object=/org/freedesktop/DBus interface=org.freedesktop.DBus member=NameAcquired cookie=3 reply_cookie=0 error=n/a Timeout reached on transaction 8616. Retrying transaction 8616. Excercising transaction 8616 for on scope llmnr on eth0/AF_INET6. Sending query packet with id 8616 on interface 2/AF_INET6. Timeout reached on transaction 28149. Retrying transaction 28149. Excercising transaction 28149 for on scope llmnr on eth0/AF_INET. Sending query packet with id 28149 on interface 2/AF_INET. Got LLMNR query packet for id 8616 Sending response packet with id 8616 on interface 2/AF_INET6. Got LLMNR query packet for id 28149 Sending response packet with id 28149 on interface 2/AF_INET. Got LLMNR reply packet for id 8616 Processing incoming packet on transaction 8616. Got LLMNR reply packet for id 28149 Processing incoming packet on transaction 28149. Timeout reached on transaction 8616. Retrying transaction 8616. Excercising transaction 8616 for on scope llmnr on eth0/AF_INET6. Sending query packet with id 8616 on interface 2/AF_INET6. Timeout reached on transaction 28149. Retrying transaction 28149. Excercising transaction 28149 for on scope llmnr on eth0/AF_INET. Sending query packet with id 28149 on interface 2/AF_INET. Got LLMNR query packet for id 8616 Sending response packet with id 8616 on interface 2/AF_INET6. Got LLMNR query packet for id 28149 Sending response packet with id 28149 on interface 2/AF_INET. Got LLMNR reply packet for id 8616 Processing incoming packet on transaction 8616. Got LLMNR reply packet for id 28149 Processing incoming packet on transaction 28149. Timeout reached on transaction 8616. Retrying transaction 8616. Excercising transaction 8616 for on scope llmnr on eth0/AF_INET6. Sending query packet with id 8616 on interface 2/AF_INET6. Timeout reached on transaction 28149. Retrying transaction 28149. Excercising transaction 28149 for on scope llmnr on eth0/AF_INET. Sending query packet with id 28149 on interface 2/AF_INET. Got LLMNR query packet for id 8616 Sending response packet with id 8616 on interface 2/AF_INET6. Got LLMNR query packet for id 28149 Sending response packet with id 28149 on interface 2/AF_INET. Got LLMNR reply packet for id 8616 Processing incoming packet on transaction 8616. Got LLMNR reply packet for id 28149 Processing incoming packet on transaction 28149. Timeout reached on transaction 8616. Retrying transaction 8616. Transaction 8616 for on scope llmnr on eth0/AF_INET6 now complete with from none (unsigned). Record Thinkpad-T440s. IN fe80::95eb:8e44:c908:cafc successfully probed. Freeing transaction 8616. Timeout reached on
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
I can confirm, that the issue with systemd-resolved is still very much present on Ubuntu 16.10. If Forticlient runs (split horizon), then the name resolution is very slow or nonexistent (timeouts). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
OMG..this is still unresolved? I moved to Linux mint because of this. On Sat, Mar 11, 2017 at 3:49 PM, Markus J Schmidtwrote: > Same problem with VPNC and 16.04.2. Worked before on fresh upgrade to > 16.04.0. > > At the moment I am not able to work remote. Please fix this! > > ** Tags added: xenial > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1624317 > > Title: > systemd-resolved breaks VPN with split-horizon DNS > > Status in systemd: > New > Status in systemd package in Ubuntu: > Confirmed > > Bug description: > I use a VPN configured with network-manager-openconnect-gnome in which > a split-horizon DNS setup assigns different addresses to some names > inside the remote network than the addresses seen for those names from > outside the remote network. However, systemd-resolved often decides > to ignore the VPN’s DNS servers and use the local network’s DNS > servers to resolve names (whether in the remote domain or not), > breaking the split-horizon DNS. > > This related bug, reported by Lennart Poettering himself, was closed > with the current Fedora release at the time reaching EOL: > https://bugzilla.redhat.com/show_bug.cgi?id=1151544 > > To manage notifications about this bug go to: > https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions > ** Bug watch added: Red Hat Bugzilla #1151544 https://bugzilla.redhat.com/show_bug.cgi?id=1151544 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Same problem with VPNC and 16.04.2. Worked before on fresh upgrade to 16.04.0. At the moment I am not able to work remote. Please fix this! ** Tags added: xenial -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1624317] Re: systemd-resolved breaks VPN with split-horizon DNS
Same here. Issue still on going with zesty 17.04 and quite painfull to deal with. One other approach is to re-symlink resolv.conf to /run/systemd/resolve/resolv.conf but openconnect then update /run/resolvconf/resolv.conf making this a total mess. I don't get it, this should be fairly trivial... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1624317 Title: systemd-resolved breaks VPN with split-horizon DNS To manage notifications about this bug go to: https://bugs.launchpad.net/systemd/+bug/1624317/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs