Bug#530763: linux-image-2.6.26-2-vserver-686: Weird IPv6 routing in vserver guests

[Jonathan Nieder <jrnieder@gmail.com>]

Hi Pierre,

Pierre Tourbeaux wrote:

> I have a strange problem of IPv6 routing inside my vserver guests.
[...]
> So, the services hosted on this guest are reachable from IPv6 hosts, this is OK.
> But, when I initiate a connection from the guest to an external host in IPv6,
> the source IP is 2001:6f8:202:291::2 and not 2001:6f8:33c::3. This is like
> NAT in IPv6, something goes wrong...
>
> I had a full working setup before upgrading in Lenny. I was on Etch with
> util-vserver from backports.org (0.30.216~r2772-6~bpo40+1) and the following
> kernel : http://files.si7v.fr/kernel/2.6.22.19-vserver-ipv6/ to have Vserver
> IPv6 support.
>
> Feel free to change my bug report if it concerns the package util-vserver. I
> don't know if it's kernel related.

Sorry for the long delay.  A few questions (please forgive my
ignorance):

 - does running an older or newer kernel on the host help (this would
   rule out a userspace problem)?
 - what does "iptables --list" on the host say?
 - if this is reproducible with a recent kernel (or even if not), any
   hints for someone trying to reproduce it?  Step by step
   instructions for starting from a fresh Debian installation to
   experiencing the bug would be best.