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Originally Posted by ian@huth
Mac addresses are unique to the equipment and not a particular area. They identify that piece of equipment, the manufacturer, model No, etc. When NTL receive a batch of new modems they each have their own unique mac address and could end up in any part of the country. I have had batches of equipment arrive with mac addresses all being quite different from one another, not sequential numbering.
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I am well aware of that, I also know how easy it is with some ethernet processor IC's to simply change the MAC address to anything you want.
This requires a little knowledge and downloading the datasheet for the device fitted to the modem.
The reason why I mentioned areas, is I am guessing the best area to install a modem with a spoofed MAC address would be off the same ubr as the genuine one. I would of thought it would make identification of the real modem from the illegal one difficult, as it wouldn't stand out like a sore thumb.
Thats why I think information on as many MAC addresses with areas as they can get would be useful.