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Next time you are leaching off of someone else's wifi use this command before you start your bittorrent ...for legitimate files only of course.
It creates a hexidecimal string using md5sum from the first few lines of /dev/urandom and splices it into the proper MAC address format. Then it changes your MAC and resets your wireless (wlan0:0).
eth0 = the name of the interface
00:01:02:03:04:05 = the new mac adresse
the same thing for wireless card $ sudo iwconfig eth1 hw ether 00:01:02:03:04:05