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ssh hangs in initial handshaking when using IPv6 to connect with a
NetBSD 4.0 ssh server. I tried NetBSD on i386 and amd64.
Here is the output from ssh -v when it fails: (I censored the IPv6
address)
rhia...@glicca:~$ ssh -v radl
OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct 2007
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to radl [2001:xxxx:xxxx::1] port 22.
debug1: Connection established.
debug1: identity file /home/rhialto/.ssh/identity type -1
debug1: identity file /home/rhialto/.ssh/id_rsa type -1
debug1: identity file /home/rhialto/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.4
NetBSD_Secure_Shell-20061114
debug1: match: OpenSSH_4.4 NetBSD_Secure_Shell-20061114 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.7p1 Debian-8ubuntu1.2
debug1: SSH2_MSG_KEXINIT sent
and here it hangs, until the other side times out.
When using IPv4 it works fine.
strace shows that ssh hangs in a select() call:
....
read(3, "u", 1) = 1
read(3, "r", 1) = 1
read(3, "e", 1) = 1
read(3, "_", 1) = 1
read(3, "S", 1) = 1
read(3, "h", 1) = 1
read(3, "e", 1) = 1
read(3, "l", 1) = 1
read(3, "l", 1) = 1
read(3, "-", 1) = 1
read(3, "2", 1) = 1
read(3, "0", 1) = 1
read(3, "0", 1) = 1
read(3, "6", 1) = 1
read(3, "1", 1) = 1
read(3, "1", 1) = 1
read(3, "1", 1) = 1
read(3, "4", 1) = 1
read(3, "\n", 1) = 1
write(3, "SSH-2.0-OpenSSH_4.7p1 Debian-8ub"..., 40) = 40
fcntl64(3, F_GETFL) = 0x2 (flags O_RDWR)
fcntl64(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0
write(3, "\0\0\3\24\10\24\264\267\3426\226\\6\254\305\267H\265QT"..., 792) = 792
select(4, [3], NULL, NULL, NULL
It is apparently an Ubuntu 8.04.1-specific problem, since some other people I
polled on a #netbsd irc channel reported that they could repeat the problem on
Ubuntu-based machines but the problem did not occur for other Linux
distributions. I'm using eeebuntu on an Eee 901 which is based on 8.04.01.
I found a xubuntu 8.04 live cd which does not show the problem so probably the
problem is quite specific.
rhia...@glicca:~$ lsb_release -rd
Description: Ubuntu 8.04.1
Release: 8.04
rhia...@glicca:~$ apt-cache policy ssh
ssh:
Installed: (none)
Candidate: 1:4.7p1-8ubuntu1.2
Version table:
1:4.7p1-8ubuntu1.2 0
500 http://nl.archive.ubuntu.com hardy-updates/main Packages
500 http://security.ubuntu.com hardy-security/main Packages
1:4.7p1-8ubuntu1 0
500 http://nl.archive.ubuntu.com hardy/main Packages
hm, does that think I don't have ssh installed? I wonder which ssh I am then
supposed to be using...
It does claim to be "OpenSSH_4.7p1 Debian-8ubuntu1.2, OpenSSL 0.9.8g 19 Oct
2007"
I expect the ssh client to continue after SSH2_MSG_KEXINIT, like when
using IPv4.
** Affects: openssh (Ubuntu)
Importance: Undecided
Status: New
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ssh hangs in initial handshaking when using IPv6
https://bugs.launchpad.net/bugs/281882
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