Comment 10 for bug 633392

> You think this is an issue with the kernel?

Did you get a chance to run this test with libvirt shut down? If so,
then the kernel and hardware are the only thing left in the equation.
If not, then it's not inconceivable, but unlikely, that libvirt is
periodically doing something nefarious. Is there anything suspicious in
/var/log/syslog around the time that the connection hangs?

I will try to reproduce this using a lucid kvm guest with a similar
network configuration. But I'm marking this as affecting the kernel
in the meantime in case someone over there has seen this before
or seen it discussed.