The windows ics sucks for port forwarding but it works. You can't forward all ports to another computer in your network unless you don't want the computer w/ the internet connection to get hosed
Just forward ports for the services that you need.
Webserver: forward port 80
FTP server: forward port 21
If you want a better way of doing this and you have a broadband connection just get a router, it saves a lot of hassle and is very reliable. Get a Netgear or Linksys.
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