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

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

> 
> 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 had similar problems where Dom0 would stop correcting TCP checksums
when routing packets out over a GRE tunnel. It caused huge amounts of
frustration. I resolved the problem by disabling checksum offloading
everywhere. Another server does this occasionally too.

It's a bit different to your situation, but had the same pattern of
working for a bit then stopping.

Try disabling checksum offloading everywhere and see if it becomes more
stable.

James



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