Unfortunately i don't see anything telling in the wireshark log. Could you try out the instructions in comment #33 (taking into account the corrections in comment #35)?
When a VM is running, what do ifconfig -a netstat -nr show? ** Changed in: qemu-kvm (Ubuntu) Assignee: Serge Hallyn (serge-hallyn) => (unassigned) ** Changed in: qemu-kvm (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to bridge-utils in Ubuntu. https://bugs.launchpad.net/bugs/616064 Title: Broken networking in kvm guests To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bridge-utils/+bug/616064/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs