User Defined MAC Address
If you must define your own MAC address, you can enter it here. If you do not
use a unique value, you may not be able to communicate to your wired network at
all. For this reason, it is STRONGLY RECOMMENDED that you use the Factory MAC
address. A MAC address is 12 hexadecimal digits. You do not need to use
delimiters, but if you want you can use spaces or the colon character.
The User Defined MAC Address only takes effect after re-starting your machine.