Comment 2 for bug 1866139

Hi Arjun,

Isn't it qemu's responsibility to send a GARP when it starts the the vm on the destination host? Likely that's why you're not finding the relevant code in openstack, because it's in qemu. But qemu does not anything about floating ips so we have to do that from neutron.

So this may be a qemu bug (qemu not sending the garp), an openstack bug (openstack not configuring/using qemu correctly), or even a later network problem blocking the garp before it reaches the switches needing to learn the new port for the mac.

I hope this helps with debugging.