How can I forward a port in Windows XP for Vuze and µTorrent?

ndauvbieny October 5, 2011

What is the need of doing a port forward? What is it? And what it is done for?

I am using a cable modem. Do I need to do it? Anyone please explain the fundamentals behind it. And please don’t refer to any sites for self-read. I’ve had enough of them to no avail. Please help!

  1. James Bruce
    October 6, 2011 at 8:40 am

    As to whether you need to do it or not, download uTorrent, set it up to randomize port and automaically confure with uPnP - then see if it gives you non-connectable error. If it does, chances are it cannot autconfigure for you, and you *do* need port forwarding. Give it a while to check though, these things aren't instant. 

    October 6, 2011 at 5:54 am

    Hello, can you tell us a bit more about what firewall you are using?  If you do not have a router, I do not think you can use your modem to port forward ports.  Is your modem just a modem or a modem/router combo.  If you do not have a router, you will have to open the port on your firewall.  Usually, you would pick a high port (over 50,000) for torrenting.  If you are using utorrent, you do not need to port forward a port, just clicking on the UPnP with random port is enough.  Port Forwarding works better when you have set up a static ip address.

  3. Jeff Fabish
    October 5, 2011 at 11:37 pm

    Port Forwarding allows an external service to connect to a given port, which otherwise would have been invisible. In some cases, it's simply for optimization. Instead of a packet attempting to use every port until one is available for use, you can tell your gateway to take any requests for X port and redirect it to Y port.

    In order to understand port forwarding, you need to understand networking. Basically, each computer on the network has an address, which is similar to your home address, it's how programs know which computer to send the data to. Programs originating from the internet send data ('packet') to your IP address. When you have port forwarding enabled, if that port is listed to be forwarded, it will take the packet's header information and rewrite the destination port to be that of the one you forwarded it to.

    ( represents the internet application, "computer" represents
    your computer. ":100" is the port it's trying to connect to)

    Before port forwarding: ====> Your Computer:100

    After port forwarding: ====> Computer:304

    Your router/modem told the request to port "100" that it must instead go to port "304".

  4. Mjevolve
    October 5, 2011 at 8:53 pm

    simple put , a computer has a set of entry and exit points for the internet traffic , known as Ports .
    there are almost 
     ports .

    some of them are reserved for standard defacto communications like port 80 for HTTP .
    while most are left as is ..

    port forwarding in simple means , you are opening a entry / exit point for an application on a computer  so as to allow free communication .

    in apps like the uTorrent , which work on the P2P network , 
    you need a definitive Port , to connect , 
    so as to allow seamless network traffic to and fro the application .

    on how to Forward A Port you need to check here ----  .

    you have to allow / specify a port to forward in your router / modem .
    and every router / modem has different way .

    the above site has a huge repository of known and available routers and modems through out the world with detailed instructions on how to do it .

    dont worry , just select your router make and select the app you want to port forward for , and it will be very easily explained ..


    you also need to forward that same port through your firewall also , 
    if you are running one .
    for that you will have to consult the Firewall's Help file ..

    hope it helps ..

    tell if you need more help ....