[Answer ID: 14473]
How to: Change WAN MAC address on UserFriendly Firmware.
Change WAN MAC address on Professional Firmware link is : here
A Media Access Control address (MAC address) is the network interface (Ethernet Hardware) address.
Some ISPs register MAC address. If you wish to change MAC address to a previously registered address or change it to new MAC address follow the instructions bellow:
1- Launch browser to 192.168.11.1
2- Click Internet/LAN | Internet tab.
3- Click option "Use this address
4- Enter MAC address: six group colons seperated Hexadecimal digits in capital letters. For example (00:24:AA:BB:CC:EE).
5- Click "Apply" button to execute the change.