This is probably a duplicate of:
https://bugs.launchpad.net/ubuntu/+source/xen-3.3/+bug/154271

I always disable tx checksumming on xen domu's to avoid this problem.  I
would be curious to hear from chris lea as to what exactly breaks when
doing this.  I have never noticed any problems with incorrect packets
being sent out.  My understanding is that with tx checksumming off only
the hardware assistance is disabled and tx checksumming is then handled
by software (by the kernel I assume).

For people who want to see if they are being affected by bug 154271 you
should enable tx checksumming on the domU, run tcpdump during a large
network transfer, and look for packets larger than 1500 bytes being
sent.

-- 
networking stalls between domU using vif
https://bugs.launchpad.net/bugs/246789
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