[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
Update: it works if I change the cipher (to blowfish, in this instance). Doesn't work using aes128. -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/281882 Title: ssh hangs in initial handshaking when using IPv6 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/281882/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
I'm seeing this same issue on Ubuntu 14.04 LTS using OpenSSH 1.0.1f. mab@source:~$ ssh -v mtaxxx OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to mtaxxx [ip address hidden] port 22. debug1: Connection established. debug1: identity file /home/mab/.ssh/id_rsa type -1 debug1: identity file /home/mab/.ssh/id_rsa-cert type -1 debug1: identity file /home/mab/.ssh/id_dsa type 2 debug1: identity file /home/mab/.ssh/id_dsa-cert type -1 debug1: identity file /home/mab/.ssh/id_ecdsa type -1 debug1: identity file /home/mab/.ssh/id_ecdsa-cert type -1 debug1: identity file /home/mab/.ssh/id_ed25519 type -1 debug1: identity file /home/mab/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH_6.6.1* compat 0x0400 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server-client aes128-ctr hmac-md5-...@openssh.com none debug1: kex: client-server aes128-ctr hmac-md5-...@openssh.com none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY Connection closed by ip6 address I can ping6 the host, see the traffic getting there in tcpdump, but SSH won't connect (over v6). -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/281882 Title: ssh hangs in initial handshaking when using IPv6 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/281882/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
ssh -6 ip6-localhost should trigger this, but it does not at least on 12.04. Does anyone else still see this issue? -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/281882 Title: ssh hangs in initial handshaking when using IPv6 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/281882/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
** Tags added: ipv6 -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
I can confirm this problem on Intrepid with kernel 2.6.27-11-server This really bites when you try to SSH in from a Mac to an avahi name, which seems to go with ipv6 by default. -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
** Changed in: openssh (Ubuntu) Status: New = Confirmed -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
I am unable to duplicate this issue on my local Ubuntu Intrepid 8.10 (x64) desktop, even before making any of the changes suggested in this message. For those who are affected by this: ssh -4 somehost will use IPv4 only to connect, which would appear to be a viable workaround. To make IPv4 only a global default for the client, edit /etc/ssh/ssh_config and add a line AddressFamily inet to the end of the default file (i.e., in the entry for Host *). At the server end of things, one can configure sshd to use IPv4 only by adding a line ListenAddress 0.0.0.0 to /etc/ssh/sshd_config and restarting sshd. -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
Do you have IPV6 enabled or did you blacklist it like most people did? an ifconfig dev will tell you if you have an ipv6 address. Also do you have localhost defined in /etc/hosts like is now default in Jaunty? The workaround works fine, but if we are going to enable ipv6 by default a real fix needs to be put into place. -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
I now have eeebuntu 2.0 (based on ubuntu 8.10, kernel 2.27.8-eeepc) on my Eee, and strangely enough, I don't get an IPv6 address most of the time. Just now I tried restarting rtadvd (the routing advertising daemon) on the router and after that, I did have an IPv6 address (but that may be coincidence). Anyway, the ssh connection works fine. So the problem fortunately seems limited to a small set of kernel versions. -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
** Changed in: openssh (Ubuntu) Status: Invalid = New -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
While the referenced email thread ( http://kerneltrap.org/mailarchive /openbsd-misc/2007/4/24/148531 ) is quite interesting, it doesn't seem to refer to IPv6 at all. I also don't use the pf packet filter (firewall), but ipf, and not even between my internal hosts. So the cited possible solution doesn't appear to be relevant at all. I made a packet trace with wireshark on both ends, and it seems to indicate a TCP checksum error by the sender (Ubuntu). This is seen from both the Ubuntu side and the NetBSD side. I have attached a text version, where I have somewhat anonymised the Ethernet and IPv6 addresses. So that would make it a kernel or an ethernet driver issue. The Ubuntu machine is an Eee 901. [ 51.729198] ATL1e: eth0 NIC Link is Up100 Mbps Full Duplex ** Attachment added: Packet trace as seen from the server side http://launchpadlibrarian.net/23084820/packets.txt -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
Thanks for taking the time to report this issue. As already mentioned this seems to be an error in the handling of Ubuntu Openssh generated packages by the *bsd firewall pf. Marking therefore as invalid here. Feel free to reopen at any time. ** Changed in: openssh (Ubuntu) Status: New = Invalid -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
[Bug 281882] Re: ssh hangs in initial handshaking when using IPv6
** Changed in: openssh (Ubuntu) Sourcepackagename: None = openssh -- ssh hangs in initial handshaking when using IPv6 https://bugs.launchpad.net/bugs/281882 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to openssh in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
