openssh unix dev - Mar 2002 - [Bug 164] X-forwarding when connecting to an IPv6-enabled host doesn't work.

http://bugzilla.mindrot.org/show_bug.cgi?id=164





------- Additional Comments From stevesk at pobox.com  2002-03-14 06:17 -------
can you provide sshd -d output?  i want to see any
debug messages from x11_create_display_inet().




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------- Additional Comments From carljohan at kjellander.com  2002-03-14 10:12
-------
Created an attachment (id=41)
Patch to configure.ac to make sshd forward X11 on both IPv6 and IPv4.




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------- Additional Comments From carljohan at kjellander.com  2002-03-14 10:30
-------
What is the meaning of DONT_TRY_OTHER_AF? It's only enabled on linux and
is the source of this problem. Without it sshd opens forwarding on both
IPv6 and IPv4.

Are there any bad sideeffects of this?




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carljohan at kjellander.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |minor



------- Additional Comments From carljohan at kjellander.com  2002-03-14 11:16
-------
Maybe this isn't a bug at all, maybe it's a feature. DISPLAY is set to
localhost:0 and localhost doesn't resolve to ::1 as standard.

Adding this line to /etc/hosts makes apps connect to the IPv6 tunnel.

::1 localhost

But I still can't figure out why linux is the only system that shouldn't
open the tunnel on both IPv4 and IPv6.

Changing the severity to minor.



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------- Additional Comments From djm at mindrot.org  2002-03-14 11:25 -------
The reason is that we are running afoul of a fix to avoid a quirk in Linux's
IPv6 support. IIRC a wildcard bind() on IPv4 will cause a subsequent IPv6 bind()
to fail. 

Since we are not using wildcard binds in the localhost X11 case, the following
patch should help. Please report on whether this is the case.



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------- Additional Comments From djm at mindrot.org  2002-03-14 11:27 -------
Created an attachment (id=42)
Tries all AFs when binding to localhost




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------- Additional Comments From carljohan at kjellander.com  2002-03-14 13:27
-------
Nope that didn't work. Maybe you reversed the meaning of AI_PASSIVE?

I'm attaching a patch that uses x11_use_localhost instead.



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------- Additional Comments From carljohan at kjellander.com  2002-03-14 13:29
-------
Created an attachment (id=43)
Attach to both AFs even in linux when connecting to localhost




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