Also, another thing to consider is to set your FShost machine up to be a static IP. This will save you untold grief!

A big problem exists with routers and dynamic IP addresses. If you forward a game port to a specific IP, then later on down the road, the dynamic IP addresses get re-assigned in a different order, the ports will be forwarded to the wrong machine.
I have seen people get programs to work perfectly for a few weeks and then quit for no apparent reason...or so they think.
Bottom line, save yourself the static...Go Static!!
http://www.portforward.com/ has all the info you could ever need for this.
Good Luck
Chuck
CYXU