When you retain the MAC address when migrating, you might inadvertently create a duplicate MAC address. You can change the MAC address for the migrated virtual machine.

After migration, there are communication problems among your virtual machines.

You created a duplicate MAC address during the migration process.

1

In the vSphere client, power off the virtual machine.

2

In the inventory, right-click the virtual machine and choose Edit Settings... from the context menu.

The Edit Settings window opens.

3

On the Virtual Hardware tab, expand the Network adapter.

4

Next to the MAC Address text box, choose "Manual" from the drop-down menu.

The MAC Address text box is editable.

5

Specify a unique MAC address.

6

Click OK.

Check to see whether the unique MAC address solves your communication problem.