During a Live Migration, the system loses all network configuration. After the reboot, nothing functions and manual reconfiguration of IP address, subnet mask, gateway, and DNS was required.

Found the OS config /etc/sysconfig/network/ had new ethernet interfaces. They had to reboot and then got a menu to add an IP address and hostname, just like the initial setup.

Live Migration is moving from one hyper-V host server to another, similar to Vmotion in VMWare.

After reconfiguration, network settings showed Ethernets and their information.

The Hyper-V Virtual Machine has a Dynamic MAC address on the Ethernet Network Interface Card (NIC) which changes after reboot or Live Migration, causing the Linux VM to lose IP settings since they are associated with the system’s MAC address.

To resolve this issue, you will need to follow below steps:

1- Power off the Hyper-V VM.
2- Open Hyper-V VM Settings.
3- Assign a Static MAC Address to the Ethernet NIC.

Unlike most controls for networking, this must be set while the VM is powered off.