What is NAT port forwarding?

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Describe in brief how you would set up port forwarding on a NAT router to allow a PC on the LAN to publish its web to the internet.

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It’s fairly simple depending on what equipment you are using for your router/firewall but here are the basics.

The following are examples:

You have a range of public IP addresses avaiable from your ISP – and your internal IP address scheme is class C

Your work station that you want to open the web services to has a static IP address of (note: must be static).

What you need now is to pick an available IP address from your public IP address and say we pick

Now you must tell the router that any external requests to must be redirected to

After the mapping above has been done you must then tell the router/firewall what types of traffice you want to allow through to such as HTTP or port 80, FTP, POP3, SMTP and so on.

Those are the principles and will not change from router to router or firewall to firewall.

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  • Buddyfarr
    that is true, if you are using a simple NAT firewall like a netgear one all you have to do is go to your browser and type in the address, usually and hit enter. If it doesn't already have a password set one immediately. Then go to the Port Forwarding link on the left. If web is the only thing you want to do then add the HTTP and HTTPS (secure HTTP) service and enter the IP address of your internal server that is running the web server. then the router will forward all incoming traffic for port 80 (HTTP) and 443 (HTTPS) to that internal server. if you want to do email then use port 25 for SMTP, and port 110 for POP3. For remote desktop support use port 3389.
    6,850 pointsBadges:

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