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To: Cogito who wrote (83671)	7/10/2009 2:00:51 PM
From: shlurker	Respond to of 213177

Thanks for providing the correct buzzwords to search for: "MAC address cloning" This explains it, for example: "...ISPs ensure each customer receives only one dynamic address using several methods. Dial-up and many DSL services typically require the customer to log in with a username and password. Cable modem services, on the other hand, do this by registering and tracking the MAC address of the device that connects to the ISP. The device whose MAC address is monitored by an ISP can be either the cable modem, a broadband router, or the PC that hosts the Internet connection. The customer is free to build a network behind this equipment, but the ISP expects the MAC address to match the registered value at all times. Whenever a customer replaces that device, however, or changes the network adapter inside it, the MAC address of this new equipment will no longer match the one registered at the ISP. The ISP will often disable the customer's Internet connection for security (and billing) reasons...." compnetworking.about.com