As a follow-up action of yesterday's IPv6 sub-team meeting, I would like to start a discussion about how to support l3 agent HA when IP version is IPv6. This problem is triggered by bug [1] where sending gratuitous arp packet for HA doesn't work for IPv6 subnet gateways. This is because neighbor discovery instead of ARP should be used for IPv6. My thought to solve this problem turns into how to send out neighbor advertisement for IPv6 routers just like sending ARP reply for IPv4 routers after reading the comments on code review [2]. I searched for utilities which can do this and only find a utility called ndsend [3] as part of vzctl on ubuntu. I could not find similar tools on other linux distributions. There are comments in yesterday's meeting that it's the new router's job to send out RA and there is no need for neighbor discovery. But we didn't get enough time to finish the discussion. Can you comment your thoughts about how to solve this problem in this thread, please? [1] https://bugs.launchpad.net/neutron/+bug/1357068 [2] https://review.openstack.org/#/c/114437/ [3] http://manpages.ubuntu.com/manpages/oneiric/man8/ndsend.8.html Thanks, Xu Han -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20140827/2c11e8a0/attachment.html>