An Nforce 2 (with Built in Lan) have a BIOS capability to change the MAC address of its built-in LAN card.
 
ex: AA-AA-AA-AA-AA-AA
 
Anyway, a squid precompiled to authenticate MAC, can do that. If what u want is internet authentication (since u didn't specify specific service)

> Anyone have an idea regarding Username, Password and MAC address
> authenticate combination for a certain client?
>

Two major disadvantages:

1. MAC addresses cannot be transmitted across gateways.
2. MAC addresses can be easily forged. This is the key component of ARP
spoofing attacks.

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