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Block a port on only one NIC?

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I have a NT Workstation that has to be set up as an FTP server to communicate with a piece of specialized medical equipment, and that workstation has 2 NICs, one for the equipment and one for the LAN. I want to make port 21 unavailable to the LAN while keeping it available to the equipment. Is there a way to block a port on only one NIC in WinNT 4 Workstation, or via a decent piece of software? Is there another scenario that is suggested to secure port 21 on the LAN?

Thanks for any assistance!
Johnny5
 
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