Live migration garp

Hello All, I am facing issues under openstack rocky with last libvirt available on centos 7. There is an open discussione here: https://bugs.launchpad.net/neutron/+bug/1866139 About sending garp when an instance live migrate. What must send garp ? The problem is this: when live migrate a vm from a node to another it stops to responds to ping requests. It starts to respond only when it send a network request for example when its chrony daemon pools a server. Anyone could help me, please? Best Regards Ignazio