[Xen-users] Networking stops working for no apparent reason

[Arik Raffael Funke <arik@xxxxxxxx>]

Hi,

I have a Xen system with two NICs. One is delegated to domU which serves 
as router  (for an adsl modem) and one is bridged between the router 
domU, and the physical local net (including dom0).
Or: adsl NIC --- domU(router) --- xenbr (NIC2) --- internal net & dom0

This was working quite well for two weeks, however, for no apparent 
reason the networking has become very unstable over the last few days. 
There are no obvious error messages in either dom0 or domU but when I 
try pinging from the router domU to either dom0 or other domUs, I only 
get "Network unreachable.". Connections on the adsl NIC are still ok.
This is weird, as the system might run for a a day or two - or only 
minutes. Shutting down domUs, networking, xend, libvirtd, etc and 
restarting has no effect. Only restarting the entire system helps.
I am using Centos 5.4 with gitco xen hypervisor 3.4 and xenlinux 
2.6.18.8 on the router domU.
I would appreciate any hints on how to go about debugging the xen 
network. For all I can see it "should" to work just fine...
Many thanks,
Arik


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