On Mon, Apr 02, 2012 at 04:37:23PM +0100, Chris Webb wrote: > We initially saw a problem after an upgrade from 0.15.x to 1.0.
Perhaps git-bisect(1) can help you track down the change that introduced this between 0.15 and 1.0. > Once I've got a guest with broken networking, the network stays down even if > I do things like 'ip link set eth0 down; sleep 5; ip link set eth0 up'. > Killing and restarting the same VM, it runs fine next time. It sounds like this is not the issue, but are you sure the bridge has forwarding delay set to 0 or Spanning Tree Protocol disabled? With STP enabled no traffic will be forwarded by the bridge for a configured timeout, and depending on the timing of your VM bootup you could see weird things. You can check with brctl showstp br0. Stefan
