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Blocking certain MAC addresses

I'm running a windows NT network, using TCP/IP Protocol with DHCP and using WINS for name resolution. How can I block clients' MAC addresses? If it can be done through firewall, please suggest an effective firewall.
If using WINS with DHCP for name resolution, you can actually have IP Addresses assigned based on the MAC addresses and have these IP addresses restricted or blocked .If you have a switch or a router , you can also block clients MAC addresses by defining an ACL on it. You can also achieve the same thing using a firewall. Some good firewalls are Gauntlet, PIX & Checkpoint.

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