#SECURITYSPY PORT FORWARDING MODEM AND ROUTER HOW TO#

Okay, let's talk about how to forward ports through this network. 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 a 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). NAT or 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 the key parts of the network we can go on to learn how they work together. 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.If your device is plugged into the second router, then you have to set up two port forwards, or put the second router in the DMZ of the first router.Ĭheck out the image below that shows a network with two routers. This is no different than the port forwarding guides on the rest of this site. You can simply forward ports to the device in the first router and you are done. If your device is plugged into the first router, then setting up a port forward is straight-forward. If you are using wireless networking, then you can not always be sure because your device might hop back and forth between the two networks. If you are using a wired network, then you simply need to follow the wire and see which router it plugs into. If you are trying to forward ports on your network and you have two routers, then the first step you are going to have to take is determining which router your destination device is currently connected to. Which router is your device connected to?

#SECURITYSPY PORT FORWARDING MODEM AND ROUTER FREE#

Remember, our Double Router Detector is free and it does this for you, automatically. If both of your first two hops are on one of these networks then you have two routers. If both first hops are a class C network, then you have two routers between you and the internet.Īlmost all home routers use a class C network in one of the following ranges: If you run a trace rout to a known external IP, such as Cloudflare's well known 1.1.1.1 address, you can look at the first two hops to determine if they are class C networks or not. The other way to determine if you have two routers on your network is to use a command line tool called tracert. Double Router Detector will automatically detect if you are in a double router setup.

#SECURITYSPY PORT FORWARDING MODEM AND ROUTER SOFTWARE#

The easiest method is to use our FREE software Double Router Detector. How do you know if you have two routers on your network? There are two ways that you can determine if you have more than one router on your network. Use a VPN To Forward Ports Through Two Routers.Step 3: DHCP reservation or static IP address.Step 2: Forward ports from R2 to device.Which router is your device connected to?.The following guide provides more detailed information about networking with two routers. We share some fundamental port forwarding concepts that help with understanding how routers work. J(Last Updated: June 07, 2022) | Reading Time: 8 minutesĪs you can imagine, port forwarding through two routers is a bit more complex than port forwarding through one router.įor some background information about networking check out our What is Port Forwarding? article.

Securityspy port forwarding modem and router