Hello and thanks for you answer , I tried to enable post copy live migration on compute node, restarted the nova compute service
on compute nodes but when I try to live migrate a vm I have the same issue: I loose a lot of packets.
If I try with an instance which have a daemon which ping the default gateway, the live migration works fine and I do not loose packets.
I think this is a big issue.
I tried with rocky and queens with iptables_hybrid and both have the issue.