OK.. Most routers are very similar, but this setup comes from a Linksys.
First...
Figure out what the IP address is on your machine. To do this... Goto Start/Run, and type CMD. A DOS type window will launch. Type in "IPCONFIG /ALL" no quotes. IT will display your local IP address as well as some other info. Assuming your router wasn't ever changed, your IP address will show up as 192.168.1.xx
Second.
We need to log into the Router. Go to your internet browser and type in the default IP address of the router http:// 192.168.1.1
It will ask for a user name and password. The default is
user: left blank
password:admin
or
admin, admin
or admin, left blank (It all depends on your firmware version)
A GUI will launch, and then you will need to go to the applications and gaming tab, or the port forwarding tab. It depends on what firmware you are running. You will only see one or the other.
Third.
You will see some sort of table with verbaige about port range forwarding. This is where you will enter the parameters. These ports are very important. IT is how your computer responds to the internet, as well as different software programs.
On the left side you should see a spot to give it a name. Name this entry anything you like. The port range should start from 6703 to 6703. Next to that you will see drop down boxes for TCP, UDP or BOTH. Select BOTH. A little further to the right, you will see an entry spot for an IP address. This is where you will enter your computers IP address, 192.168.1.xx (The xx is a variable to whatever number the router assigned to your computer) typically a number between 1 - 50.
Fourth
Make another entry below this one with the port range 2300 to 2400. The rest is the same as above. Make sure the enable check boxes are checked.
Fifth
Save settings at the bottom of the screen, and your good to go. Exit out and launch the game.
This should do it.
Patrick