Port Forwarding Script

[admin at kclinux.net]

I'm currently setting up a Red Hat 7.3 server for a client of mine.  The
server is going to be a internet gateway, firewall, etc etc etc.  But for
my client's I.T. department to remotely connect to the Windows 2000/XP
workstations, I need port forwarding.  Thats simple enough.  Does anyone
know of a web based (PHP preferred) that does port forwarding?  Like go to
the web page, enter the computer's IP address, and it sets port XXX to
connect to port XXX on the workstation?