I recently imported an RHEL VM - and after getting it to boot - I could not get the network to play. This is how to accomplish this
The machine caches the physical mac address and this causes it to not recognise the new mac-addresses with the NIC cards
rm file in /etc/udev/rules.d/70-persistent-net.rules
In case previously the NIC cards were set as specific values
Go and edit the settings
Reboot and that should be it !!