Re: Network stalling

[Tim Durack <tdurack@gmail.com>]

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Do you mean the network scripts are broken, or the handling of interfaces in 
Dom0 is causing issues with a routed setup?

I'm configuring everything manually. The fact that I have to build gre 
tunnels to make things work as expected suggests their is something broken 
in the netfront/netback code to me.

Tim:>

On 8/31/05, Nivedita Singhvi <niv@us.ibm.com> wrote:
> 
> Tim Durack wrote:
> > Guess I should add my experiences:
> >
> > Running unstable (approx. two weeks old now.)
> >
> > Dom0 vif1.0 -> guest eth0: icmp works, ssh fails, tcp seems to have 
> checksum
> > issues. Building gre tunnels over this works around the problem. I 
> thought
> > maybe this was device driver related (tg3), so I tried bcm5700 with the 
> same
> > result.
> 
> > Tried a similar setup with a machine with e100 driver. This time I get 
> udp
> > checksum errors instead of tcp, so dns fails but ssh works ;-( A gre 
> tunnel
> > is my current workaround.
> >
> > I say checksum issues because ethereal is complaining about transport 
> layer
> > checksums when I do a capture to diagnose the problem.
> >
> > Tried various combinations of disabling tx/rx/sg/to with ethtool in both
> > Dom0 and guest, to no avail. Also tried hacking the driver code to
> > permanently disable offloads. Tried looking for the difference between
> > stable/unstable netfront and netback, but didnt get far.
> >
> > A bridged setup works, ip address on Dom0 veth0, Dom0 vif0.0 bridged 
> with
> > Dom0 vif1.0. Real pain in the neck to firewall though, due to all the
> > interfaces. Never managed to get Masquerading to work in this setup, so 
> went
> > back to a routed network with gre tunnels...
> >
> > I can try a more recent unstable if it might help, but I haven't seen 
> any
> > evidence of anything having fixed this. Love to have a simple routed 
> setup
> > working.
> 
> Tim, it's very likely that your initial problem has been resolved
> in unstable - Ian, Keir, et. al have put in quite a few fixes which
> have closed most of the outstanding issues we had. I think there
> are only a few remaining issues. However, currently routing is
> broken in unstable, so you might want to hold off on testing current
> unstable until that gets fixed.
> 
> thanks,
> Nivedita
>

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