In OpenShift 4.13.rc-5, if you use the NetworkAttachmentDefinition with "ovn-k8s-cni-overlay" type and "subnet" option, the VMs will receive an IP address via DHCP. However, after a live migration, the VMs may appear to still have the same IP address as before, but they lose connectivity to other machines on the network. To fix this issue, you can use the command `nmcli con down / up`, which will restore the connectivity. However, this will result in the VM receiving a new IP address.