Spoofing Your MAC Address in OS X

For those of you that have no idea what this is about, just skip this entry and move right along.  Nothing to see here.
For those of you that are interested, this can be quite useful when you have multiple wireless devices and for some strange reason you're only allowed to connect two at the same time to the hotel wifi.
Standard disclaimer: this shouldn't hurt anything, but could screw something up, get you in trouble, or make your pants catch on fire.  Your mileage may vary.  Use with caution, discretion and care.

Gathering Relevant Information

• Identify the default mac address of your OS X machine
• ifconfig en1 |grep eth > ~/default_mac.txt; cat ~/default_mac.txt
• Identify the mac address of one of your many wifi devices
• iPod Touch, iPhone: Settings > General > About  > Wi-Fi address
• Copy this down and store it in a file in the same format of colon separated values- AA:00:BB:22:CC:33
• echo AA:00:BB:22:CC:33 > iphone_mac.txt

Changing OS X Settings 

Snow Leopard 10.6

• Temporarily deactivate the airport card
• sudo  /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resources/airport -z
• Set the new mac address
• cat iphone_mac.txt | sudo ifconfig en1 lladdr 
• Verify the new settings
• ifconfig en1 |grep eth

Leopard

• See the instructions over at irongeek.com

Resetting to the Default

• Simply repeat the above process but use the mac address that you stored in the default_mac.txt file.  Remember that we didn't try to clean up the grep'd output so their might be garbage in there.  Open the file and grap the hex of the default mac address
• Restarting the Mac should reset the mac to the airport hardware default