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Sometimes its necessary to forward a port. One example is when you want to use a bittorrent client behind a firewall. Incoming connections will be blocked. It’s neccessry to tell the firewall that a certain port should be forwarded to a certain host.

This is usually no problem if you have a router. All modern routers have the possibility to forward ports. If you have a shared internet connection on a computer running Windows, you can still achieve this. This is applicable if you have two network cards on your computer. One connected to the internet and the other connected to another computer which can access internet through this computer.

Choose:

Control Panel -> Network Connections 

Right click on your shared internet connection, and choose Properties

Click on the tab Advanced.

The click on the Options button in the Internet connection sharing section. You should see the following window.

Now, let’s say you want another computer with IP address 192.168.0.34 be able to use a bittorrent client on port 6881. We have the following network scenario

We have to tell Windows to forward port 6881 to this computer on our network.

In the window just opened:

Choose Add.

In the description field, enter Bittorrent (TCP)

In the IP address field, enter 192.168.0.34 or whatever is the address of the computer using the bittorrent.

Make sure TCP is choosen

In the external port number field, enter 6881.

In the internal port number field, enter 6881.

Click OK

Choose Add once more

As name, type Bittorrent (UDP)

Enter the 192.168.0.34 once more in the address field.

This time, choose UDP.

Enter the same external and internal port number, i.e. 6881.

Click OK.

Repeat this for any other port you want to use for bittorrenting.

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