A Media Access Control (MAC) address is burned into every network card made. With Windows Server 2008, it is possible to allow or deny a computer or client from getting an IP Address based on a list of MAC Addresses. This is controlled by the DHCP server and is a new feature in Windows Server 2008. It does not require a domain controller, but I am still using one anyway. I use a Lubuntu Linux machine as the client. This shows that this works on devices other than Windows machines. This security can be used to prevent "Man in the middle" attacks.
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