[libvirt] Paused networking on VM up/down with NAT fwd

[Serge Hallyn]

Hi all,

some time ago bug
https://bugs.launchpad.net/ubuntu/maverick/+source/qemu-kvm/+bug/584048
was fixed in libvirt.  It's the one where when a VM is started or stopped
which has a lower macaddr than what the bridge currently has, the bridge
changes macaddr and networking pauses.  The fix was to make sure that a
macaddr assigned by libvirt will start with 'fe:' making it higher than
the physical interface.

But this doesn't help when virbr0 isn't associated with any physical
nic, as in the common NAT case!

Is there anything we can do to help that case?

thanks,
-serge