Jacob, what operating and kernel are you using? what ovs datapath (dpkg -l openv\*) ? what version of openstack? Maybe it is an issue getting in and/or out of the router namespace. Try running tcpdump on the qr-xxxxxx-xx (from namespace) and the physical interface in br-ex (from root namespace), and do a ping from namespace to outside. Then compare the timestamps on the two tcpdumps. Then try a ping from outside to in. Jame Page reported a router performance issue recently, and setting ovs_use_veth=true somehow fixed it. http://lists.openstack.org/pipermail/openstack/2013-October/001811.html Re, Darragh.