[quote author=Compunuts link=board=4;threadid=4124;start=0#42002 date=1027052692]
The NIC's MAC address is different from your DSL/Cable modem's MAC address. What we commonly call as cable/DSL modems are nothing more than brouters ( bridge+router ). The modem is the one that cable companies keep track of in their network. What your hook up to it is entirely different story.
Rogers Cable in Newfoundland keeps track of the NIC's MAC address. I know, because I had to call in the NIC's MAC address to get hooked up. Before calling in the NIC's MAC address, I could not connect to the Internet.
I'm not positive abou this, but I think there are other cable ISPs who also do the same thing.
I had Shaw Cable Internet when I lived out west. There, it did not matter what NIC I used.
I've also read where people have hooked up cable/DSL routers and had to emulate the NIC's MAC address to get hooked up.