I'm following the directions found in this article over at Mac OS X hints about spoofing a mac address. I'm running 10.4.2 on a dual 2 G5, and I typed in "sudo ifconfig en0 ether" and "ifconfig en0 ether" and got the same results (sudo is "sudo", not my user name) which gave me my MAC address. I then tried changing my MAC address by doing "ifconfig en0 ether aa:bb:cc:dd:ee:ff" where the letters are new address I wanted, and I got: "ifconfig: malformed ether address" Then I tried "username (my real user name) ifconfig en0 ether aa:bb:cc:dd:ee:ff" and got: "-bash: username: command not found" Then I tried "sudo ifconfig en0 ether aa:bb:cc:dd:ee:ff" and it asked me for my password, then I entered it and it froze the computer. This has happened several times, so I'm not sure what I'm doing wrong. Any help would be appreciated. Also, is there a good article that explains what each set of numbers/letters are? I was messing around and I found that when changing the last 6 letters/numbers (using this link) it doesn't change the equipment manufacture, but that's as far as I got.