On Thu, Apr 22, 2004 at 02:49:10PM +0800, Shadow X wrote:
> 
> 
> 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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