MAC Address filtering from a file

Hi list, Looking for some pointers if this is possible and to some documentation on howto if it is. I have EAP-PEAP working and would like a second layer of security by locking access to only allowed MAC addresses. Ideally a file containing a MAC address on each line. If the MAC address is in the file then allow it to connect (providing the authentication is also correct) but if the MAC address isn't in the file then deny access regardless of authentication. Thanks Steve -- Steven Carr Systems Development Officer SLS/ITS/Systems - (0191) 515 3953