Wouter van Ooijen wrote

>Get yourself some old ethernet cards, copy the ethernet address, and
>destroy the cards.
>
That's a nice solution, you can still use the card, let me explain:

As long as the ethernet-devices are not on the same network they can 
have the same MAC-adress. This doesn't even mean when it's connected to 
the internet directly, it can't have the a device on the other side of 
the world with the same MAC. Mostly internet providers have their own 
routers where you connect to which make the connection to the internet, 
sometimes through other many routers.

Shortly it's possible when this is true: mac1 - router - mac1 (mac1 
connected to the router to internet, mac1 directly to the internet)
This is true, except when there are more routers connected to one 
central dhcpserver or central registration-device.

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