How to spoof Firewire MAC address or hide Firewire and Ethernet - Need to add more than 2 Google Play Music accounts to machine
Spoofing MAC address is not straightforward if you do it all by yourself but there is one great package to do jus that. If you don't already have npm installed do so by following the link. Then install spoof package. By doing npm install spoof --global. Then it's very easy to change you MAC address, do spoof --help for instructions.