[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
I can reproduce @earth2mark-eeepc's findings at another Starbucks. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
I have the latest systemd recommended by #1727237, and this issue still occurs at Starbucks as well. The Starbucks WIFI defect is #1767900 which appears to be a duplicate of this one. ii systemd237-3ubuntu10 amd64system and service manager I'm in a Starbucks now. #1727237 (the systemd above) does not fix my issue. aruba.odyssys.net is still not resolved using the stub- resolv.conf file (linked from /etc/resolv.conf). cd /etc sudo /bin/rm resolv.conf sudo /bin/ln -s ../run/systemd/resolve/resolv.conf resolv.conf Using the original resolv.conf however, as per the changes above, does work. I did not make any changes to /etc/hosts. The real resolv.conf above contains the google nameservers and is sufficient to resolve aruba.odyssys.net. nameserver 8.8.8.8 nameserver 8.8.4.4 search home -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
> The internal resolver of systemd does not properly search the local dns. > Only fqdn's will resolve. This is easily mitigated and does not require > a whole bunch of enabling or disabling of things. That is unrelated to this bug report. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
I have encountered this bug as well. I have raised it with systemd-resolved. The internal resolver of systemd does not properly search the local dns. Only fqdn's will resolve. This is easily mitigated and does not require a whole bunch of enabling or disabling of things. The DHCP process will almost always provide a valid DNS locally and the DHCP client in systemd does actually create a valid resolve.conf. You just have to point /etc/resolv.conf to it. At the time of writing the systemd people refuse to accept that this is a bug. They continue to refer to it as a documentation issue. I honestly don't believe they are testing it. # Just making sure I'm out of the / dir cd /etc # resolv.conf is a link to ../run/systemd/resolve/stub-resolv.conf Which directs thing to use the local resolved. So I nuke it. sudo rm resolve.conf # Then I go and use the actual resolv.conf that actually works. sudo ln -s ../run/systemd/resolve/resolv.conf resolv.conf The above workaround is good. It will allow you to take your laptop onto all different types of networks. It will work correctly. This is for at least systemd version 237 and above. I haven't checked to see if 236 has the proper file generated or not. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
I'm now questioning if it is at all sensible to use EDNS by default. It seems like the fallback should be widened for all NXDOMAIN lookups. I've validated, that lookups fail, when DNSSEC enabled (however with a SERVFAIL, rather than NXDOMAIN). Note DNSSEC is not enabled 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/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
Can confirm that the dns logs indicate that systemd-resolved is not
falling back from UDP+EDNS0 to UDP in response to these NXDOMAIN
answers.
The existing patch only implements this fallback when the portal name
being looked up includes 'secure' as a substring:
+if (DNS_PACKET_RCODE(p) == DNS_RCODE_NXDOMAIN &&
t->current_feature_level >= DNS_SERVER_FEATURE_LEVEL_EDNS0) {
+
+char key_str[DNS_RESOURCE_KEY_STRING_MAX];
+dns_resource_key_to_string(t->key, key_str, sizeof
key_str);
+if (strstr(key_str, "secure") != NULL) {
+t->current_feature_level =
t->current_feature_level - 1;
+
+log_warning("Server returned error %s,
suspecting DNS violation DVE-2018-0001, retrying transaction with reduced
feature level %s.",
The packet capture shows a number of DNS lookups, but not containing the
substring 'secure'; and none that appear to correspond to the captive
portal itself. This may require a different sort of solution than the
previous bug, I'm not sure.
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DNS cannot be resolved in Hotel Hotspot
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[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
Status changed to 'Confirmed' because the bug affects multiple users. ** Changed in: systemd (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/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1766969] Re: DNS cannot be resolved in Hotel Hotspot
Wireshark logs for default conf of Kubuntu and logs with workaround ** Attachment added: "wireshark logs" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+attachment/5127251/+files/dnsresolv.7z ** Tags added: dns systemd systemd-resolv ** Description changed: I was asked to create a new bug for this in https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727237 as it seems to be a different issue. I have installed the nightly image of Kubuntu Bionic from 25th of April. There systemd is in version 237-3ubuntu10. + When connecting to the wifi hotspot in my hotel (Quality Hotel Augsburg) + I cannot open the hotspot landing page that should give me access to the + WIFI. With Windows and on an Iphone it's working. + + For the following distributions I can confirm it not working: + Kubuntu 17.10 + Kubuntu 18.04 (nightly image 25th of April 2018) + + The logs were taken on 18.04. + Workaround: sudo systemctl disable systemd-resolved.service sudo service systemd-resolved stop - sudo rm /etc/resolv.conf - sudo nano /etc/NetworkManager/NetworkManager.conf - >> add "dns=default" under [main] + sudo rm /etc/resolv.conf + sudo nano /etc/NetworkManager/NetworkManager.conf + >> add "dns=default" under [main] sudo service network-manager restart + Then I can connect to the WIFI and I see the login page in Firefox. - Then I can connect to the WIFI and I see the login page in Firefox. - - To capture some data I did the following: - - connect to Hotspot - - enter golem.de + To capture some data I did the following: + - connect to Hotspot + - enter golem.de Case 1: Fresh default Kubuntu install - With a default Kubuntu install it does not work. I can connect to the WIFI and get IP and DNS from DHCP but I cannot resolve any hostname. When trying to open the router ip directly in the browser it forwards to hotsplots.de which cannot be resolved. + With a default Kubuntu install it does not work. I can connect to the WIFI and get IP and DNS from DHCP but I cannot resolve any hostname. When trying to open the router ip directly in the browser it forwards to hotsplots.de which cannot be resolved. Case 2: With aforementioned Workaround I connect to the wifi, I open firefox and the login page shows up (if I havent been connected yet. In the capture I already was able to connect to the hotspot which allows immediately to connect to the webpage) ** Description changed: I was asked to create a new bug for this in https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1727237 as it seems to be a different issue. I have installed the nightly image of Kubuntu Bionic from 25th of April. There systemd is in version 237-3ubuntu10. When connecting to the wifi hotspot in my hotel (Quality Hotel Augsburg) I cannot open the hotspot landing page that should give me access to the WIFI. With Windows and on an Iphone it's working. - For the following distributions I can confirm it not working: + For the following distributions I can confirm it not working: Kubuntu 17.10 Kubuntu 18.04 (nightly image 25th of April 2018) The logs were taken on 18.04. Workaround: sudo systemctl disable systemd-resolved.service sudo service systemd-resolved stop sudo rm /etc/resolv.conf sudo nano /etc/NetworkManager/NetworkManager.conf >> add "dns=default" under [main] sudo service network-manager restart Then I can connect to the WIFI and I see the login page in Firefox. To capture some data I did the following: - connect to Hotspot - enter golem.de Case 1: Fresh default Kubuntu install With a default Kubuntu install it does not work. I can connect to the WIFI and get IP and DNS from DHCP but I cannot resolve any hostname. When trying to open the router ip directly in the browser it forwards to hotsplots.de which cannot be resolved. Case 2: With aforementioned Workaround I connect to the wifi, I open firefox and the login page shows up (if I havent been connected yet. In the capture I already was able to connect to the hotspot which allows immediately to connect to the webpage) + + PS: I'll be in this hotel till Friday 27th if more information are + required. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1766969 Title: DNS cannot be resolved in Hotel Hotspot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1766969/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
