Comment 1 for bug 715180

br100 is not set up because of a wrong intent in method ensure_bridge(). I'll link my branch later...

--- nova/network/linux_net.py.orig 2011-02-08 15:51:07.690001548 +0100
+++ nova/network/linux_net.py 2011-02-08 15:50:35.413334881 +0100
@@ -203,9 +203,9 @@
         if(FLAGS.use_ipv6):
             _execute("sudo ip -f inet6 addr change %s dev %s" %
                      (net_attrs['cidr_v6'], bridge))
- _execute("sudo ip link set %s up" % bridge)
- else:
- _execute("sudo ip link set %s up" % bridge)
+
+ _execute("sudo ip link set %s up" % bridge)
+
     if FLAGS.use_nova_chains:
         (out, err) = _execute("sudo iptables -N nova_forward",
                               check_exit_code=False)