Program/Command/Script to change the Airport and Ethernet MAC address on OSX 10.5.X MacBook Pro
ifconfig en0 lladdr your_new_mac
ifconfig en0 ether your_new_mac
Dont work on 10.5.5
So please dont give me these methods unless there something extra to do to make them work.
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is "en0" really the name of your interface? Try ifconfig -a or netstat -i and get the real name of the interface and substitue en0 for that. Also make sure you are running this command as the root user.