Network stalling

[Tim Durack <tdurack@gmail.com>]

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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:>

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