We're finding that sometimes reused floating IP addresses won't be reachable, for some reason. And I remembered that, we found the same issue once for the reference solution once, it was fixed here: [1]
Basically because the linux kernel, under some conditions will ignore the gARP requests, and reset a timeout value that would keep ignoring those requests. But if it received a REPLY packet instead, it worked. I believe that we may want to do the same in ovn controller. [1] https://github.com/openstack/neutron/commit/82831b9d8d4bd61f90610df9eca8c7f6e447f8d8
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