[Bug 164] X-forwarding when connecting to an IPv6-enabled host doesn't work.

[Colin Watson]

In article <Pine.LNX.4.44.0210281202420.30858-100000 at netcore.fi>
on openssh-unix-dev, Pekka Savola wrote:
>In any case, I'd like to see demonstrated failures.
>
>SSH over IPv6 + X-forwarding works just fine for me...

The two we've had reported (and which I can reproduce here) are:

  http://bugs.debian.org/152545
  http://bugs.debian.org/153154

In brief, $DISPLAY is set to 'localhost:10.0' but ssh binds to ::1:6010;
::1 is ip6-localhost here, not localhost. Even if I did have an X11 over
IPv6 implementation, the incorrect $DISPLAY would prevent it being used.

Perhaps it could be configurable whether X11 forwarding uses IPv6.

  $ uname -a
  Linux eurydice 2.4.20-pre10 #1 Fri Oct 11 19:25:05 BST 2002 i686 AMD Duron(tm) Processor  AuthenticAMD GNU/Linux
  $ ssh -6 -X ::1
  colinw@::1's password:

  [...]

  $ ping6 localhost
  unknown host
  $ ping6 ip6-localhost
  PING ip6-localhost(ip6-localhost) 56 data bytes
  64 bytes from ip6-localhost: icmp_seq=1 ttl=64 time=0.056 ms

  [...]

  $ netstat -an | grep 6010
  tcp        0      0 ::1:6010                :::*                    LISTEN
  $ xterm
  xterm Xt error: Can't open display: localhost:10.0
  $ DISPLAY=ip6-localhost:10.0 xterm
  _X11TransSocketINETConnect: Can't get address for ip6-localhost
  xterm Xt error: Can't open display: ip6-localhost:10.0

Thanks,

-- 
Colin Watson                                  [cjwatson at flatline.org.uk]