[Solved] Strange network problem with Xen 4.0 on stable

[fra-du@tourde.org (François TOURDE)]

Hi.

For the archives:

Le 15883ième jour après Epoch,
François TOURDE écrivait:

> Hi list.
>
> I'm using Xen (long time ago), and I've a strange problem with one of
> the DomU. It's the only DomU with this behaviour. It doesn't reply to
> ping and can't have access to the net.
>
> In detail:

[...]

> Packets seems to be forwarded from Dom0 to DomU, but not from DomU to Dom0:

[...]

> Routes are:
>
> Dom0:
> root@srv04:~# ip route
> 88.191.222.127 dev vif115.0  scope link  src 88.191.108.41 
> 88.191.223.138 dev vif114.0  scope link  src 88.191.108.41 
> 88.191.229.230 dev vif113.0  scope link  src 88.191.108.41 
> 88.191.226.108 dev vif116.0  scope link  src 88.191.108.41 
> 88.191.108.0/24 dev eth0  proto kernel  scope link  src 88.191.108.41 
> 88.191.110.0/24 dev eth1  proto kernel  scope link  src 88.191.110.41 
> default via 88.191.110.1 dev eth1 
> default via 88.191.108.1 dev eth0 

Even with accept_source_routing on all concerned interfaces, the
vif114.0 packets that should be sent to outside network are routed by
eth1, not the receiving interface eth0.

Disabling eth1 (not yet used) solves the problem.