I have recently been given the responsibility of setting up our company's new Comcast Business IP Gateway.  The router is the SMC 8014.

What I'm trying to do seems simple, but I'm running into roadblocks wherever I look!

I want to:

Block all incoming traffic to port 80, EXCEPT traffic from a specific IP address.

We have an outside support company that supports one of our internal computers.  I need to block all incoming access to port 80, but ALLOW the outside support to access the computer with their specific IP address.

To me, this sounds possible, but if it isn't....let me know.  Below are the settings for port forwarding on our new router - I see where I can forward ALL traffic from specific port(s) to an internal IP (the computer that needs support), but I don't see how to allow only ONE IP address to have access.

Any help would be greatly appreciated...thanks in advance!