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However using an IP address instead of a domain name is not very convenient, in addition the external IP address can change as most ISPs assign these addresses using DHCP. Therefore when using port forwarding you might also what to consider using Dynamic DNS. Port Forwarding Example Below is a screen shot of my home router configuration which shows the ports I've forwarded. Notice my router doesn't have a field for the external IP address as it isn't really necessary. However some do and it is usually then configured to 0. 0. 0. Checking Open Ports You can see from the screenshot above that I've opened ports 1800 and 1884 and 8884. I used the online open port check to check those ports and also one that shouldn't be open and you can see the results below. Note: I've hidden my external IP address for security reasons. Summary Port forwarding Maps external IP addresses and ports to Internal IP addresses and ports allowing access to internal services from the Internet. It is configured on home routers and it is necessary because home routers use NAT which isolates the home network from the Internet.
This step is important as the forwarding will be set to send packets to a specific internal IP address. Depending on your Application you may need a list of ports that need to be available from the the external network (i. Internet) and forwarded to the internal network. To configure port forwarding on your router you will need Admin privileges. This site has a comprehensive guide covering 100s of routers, and also port lists for many of the games/applications. Regardless of exactly how you configure it, as it varies by device, what you are essentially doing is creating a mapping table that maps an external address and port to an internal address and port. This video shows how to configure port forwarding on a BT Home Hub. This video shows you how to set it up on a Linksys router. It also shows you how to set a static IP address for your machine. Once you have forwarded the ports you may want to check that they are really open using an open port checker. Connecting to a Forwarded Port To connect to the forwarded port from the Internet you will need to know the external IP address of the Router and the Port number that has been forwarded.