Port forwarding.....

Posted on 2005-04-18
Last Modified: 2010-04-10
Hi,can someone please tell what port forwarding is.....thanks........
Question by:robin_alexander
    LVL 95

    Expert Comment

    by:Lee W, MVP
    LVL 5

    Accepted Solution

    well basically if you have a router and you want somone to access say a webserver on a machine 'behind' the router, an external user can connect to port 80 but because you have multiple computers on the router how will it know which computer to send the port 80 traffic' to?
    The idea behind port forwarding is that you can set port 80 on the router to be 'mapped' to a specific IP address of a computer 'behind' the router.

    hope that helps

    LVL 4

    Expert Comment

    usually in a network containing a router, the ports of the computers connected to the router are not visible outside the network...suppose three computers A, B, C are connected to a router, in order to make a particular port of say, computer A, visible outside (which is mostly required when u are trying to seet up a server using this computer, or for similar applications, like file sharing etc,...), u need to forward the corresponding port of computer A on the router...for example...port 21 for FTP, port 80 for a web server, etc...

    the port forwrding is usually done in the router open uop the router configuration page (usually by default) and set the particular port by using the IP address of that computer on the network...

    Featured Post

    Find Ransomware Secrets With All-Source Analysis

    Ransomware has become a major concern for organizations; its prevalence has grown due to past successes achieved by threat actors. While each ransomware variant is different, we’ve seen some common tactics and trends used among the authors of the malware.

    Join & Write a Comment

    Let’s list some of the technologies that enable smooth teleworking. 
    Meet the world's only “Transparent Cloud™” from Superb Internet Corporation. Now, you can experience firsthand a cloud platform that consistently outperforms Amazon Web Services (AWS), IBM’s Softlayer, and Microsoft’s Azure when it comes to CPU and …
    Viewers will learn how to connect to a wireless network using the network security key. They will also learn how to access the IP address and DNS server for connections that must be done manually. After setting up a router, find the network security…
    Here's a very brief overview of the methods PRTG Network Monitor ( offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

    734 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    19 Experts available now in Live!

    Get 1:1 Help Now