Although it was written in the context of Xen, you might also want to have a look at the netloop nloopbacks parameter as described in <http://www.novell.com/communities/node/4094/xen-network-bridges-explained-with-troubleshooting-notes>. On a Xen cluster with 3 physical interfaces per node I had to increase that parameter to keep interfaces from going numb. I don't know how this translates to the libvirt/kvm world. Devin -- Some people are like Slinkies: Not really good for anything, but you can't help but smile when you see one tumble the stairs. - Anonymous