![]() If R2 is the only device on LAN1, it is unlikely that its IP address will change. This is not too big of a problem if R2 is the only network device connected to LAN1. R2's external IP address should really be static. So it is important to set up a static IP address on the network devices for which you intend to forward ports. As stated earlier, if the IP address of a network device for which ports you've forwarded ports changes, the ports will not be forwarded to the correct place. If a device does not have a static IP address, then it has a dynamic IP address. The network devices for which ports are being forwarded need to have a static IP address. Static IP addresses allow you to assign an IP address to a network device and ensure that its IP address does not change. How do I stop my port forward settings from breaking? The result is that your ports are no longer forwarded to the correct IP address. When your port forward settings stop working, the most likely cause is that the network device for with you have forwarded ports has obtained a different internal IP address than the internal IP address that it had when you originally configured your port forward settings. That's great, but if you have not configured static IP addresses for the network devices for which you have forwarded ports then your port forwarding settings are just waiting to break. You have now set up port forwards in your double router network and everything is working without a hitch. If you are having trouble forwarding ports or just don't want to deal with the hassle of doing it manually, check out Network Utilities a software tool that automatically forwards your ports. (The Proper network device is the device on which you run the program for which you are forwarding ports.) In our example, we would log into R2, and then forward ports to 10.0.0.15. The next step is to forward ports from R2 to the proper network device whether it be a computer, XBOX, or PS3. Note: In order to connect to R1's web interface one will probably have to plug a computer directly into R1 and establish a connection on LAN1. In this example, we would log into R1 and forward ports to 192.168.1.5. To do this we need to forward the ports in R1 to R2's external IP address. We want to forward ports from the WAN of R1 to a computer connected to LAN2. Let's talk about how to forward ports through this network. Here is another diagram to help show the network divisions: The IP addresses that are on LAN2 are 10.0.0.1 and 10.0.0.15. Notice that the IP addresses that exist on LAN1 differ from the IP addresses on LAN2. Let's assign IP addresses to everything, and see how it would look. The computers then connect to LAN2 and receive data from R2. R2 provides NAT through its internal IP address. R2 then provides NAT to the LAN2 network below it. Another way to say that is, R2's WAN IP address is external to R2 but internal to R1. Notice that R2's external IP address does not connect to the internet, but to another private network. R2 connects to LAN1 with an external IP address. The only thing connected to LAN1 is the router R2. R1 also has an internal IP address that provides NAT to the internal LAN1 network below it. R1's external IP address connects R1 to the Internet, just like any other network. Our network here is a bit more complex than the basic network. The internal IP address connects the router to the internal network. The external IP address is the one that connects that router to the WAN (Wide Area Network). Network Address Translationįor the sake of readability, "Router #1" and "Router #2" will be referred to as "R1" and "R2" respectively.Įvery router does NAT (Network Address Translation) and has both an internal IP address and an external IP address. Now that we have identified these things we can go on to learn how they affect us. If there is a LAN then there is an accompanying WAN. There are TWO WANs (Wide Area Networks).There are TWO LANs (Local Area Networks).Both "Router #1" and "Router #2" have TWO IP addresses an Internal IP address and an External IP address.Below is a diagram of a double-routered network. This guide will attempt to provide you with the information you need to know in a way that is as simple and straightforward as possible.Īs you can imagine, port forwarding through two routers is a bit more complex than port forwarding through one router. It presents fundamental port forwarding concepts and will make understanding this guide easier. If you have not read our What is Port Forwarding page, now would be a good time to do so. We have FREE software that will automatically detect if you are in a double router setup. J(Last Updated: August 24, 2021) | Reading Time: 4 minutes
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