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10.3: Change Ethernet MAC address from the Terminal
Authored by: Bytesmiths on Nov 07, '03 01:45:31PM
I can't swear it actually worked, but this is documented on the Jaguar man page. I also recall doing this in Solaris 7 -- some five years ago -- so I suspect it has been with us from the beginning of MacOS X.

Not that it isn't useful to be reminded of such things, though...

One caveat -- you may have to re-install certain software after doing such a thing. Some licensing activation schemes tie an install to the MAC, and the software will cease working if it thinks it's been copied to a different machine.

Unless you know what you're doing, messing with the MAC is generally not advised!

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