Dear list, I've stumbled upon a weird condition in Neutron and couldn't find a bug filed for it. So even if it is happening with the Kilo release, it could still be relevant.
The setup has 3 network nodes and 1 compute node currently hosting a virtual network (GRE based). DVR is enabled. I have just added IPv6 to this network and to the external network (VLAN based). The virtual network is set to SLAAC. Now, all four mentioned nodes have spawned a radvd process and VMs are getting globally routable addresses. Traffic has been statically routed to the subnet so reachability is OK in both ways. However, the link-local router address and associated MAC address is the same in all 4 qr namespaces. About 16% packets get lost in randomly occuring bursts. Openvswitch forwarding tables are flapping and I think that the packet loss occurs at the moment when all 4 switches learn the MAC address through a GRE tunnel simultaneously. Another router address and the external gateway address resides in a snat namespace, which exists in only one copy. When I tell the VM to route through that, there is no packet loss. Is there any way to change the behavior to either get rid of the MAC address conflict of push a default route to the VMs through the stable gateway? Thanks, Tomas _______________________________________________ OpenStack-operators mailing list OpenStack-operators@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators