That's outside the scope of this guide, but essentially means "trust everything and forward it all onto this other device to deal with". If that's not possible, you may also want to try setting up a DMZ (demilitarized zone) pointing to your other router. Some ISP-provided routers don't let you do this. This disables all routing features, including any built-in Wi-Fi, effectively turning it into a simple modem.
If you can configure both routers, the one closest to the public side (usually the one provided by your ISP) should be switched to Bridge mode. For instance, if you use added Google Wi-Fi, alongside an existing ISP-provided router. You might even have caused a double-NAT issue yourself by adding another router to your network. Unfortunately, it's not always possible to fix a double-NAT situation. Port forwarding won't help in this case because the ports will still be blocked on that other router which you can't control, so the packets will never reach your own router. This is commonplace in college dormitories and some apartment complexes where your internet options are limited. So let's take a look at how you can manually create port forwarding rules. Even if you haven't disabled UPnP, sometimes it just doesn't work right. If you've disabled UPnP because you consider it dangerous, you'll have to set up these port forwarding rules manually for every application that needs them. It would then be able to open up ports for its own nefarious purposes, such as allowing remote control of your machine. Some people consider this to be a security flaw though, since any malware that finds itself installed on your computer is trusted by the router. Load Balancer, upon receiving the traffic on a certain frontend port, will forward traffic to the target virtual machine on a specific backend port. Applications can request a port to be opened and the router will automatically set up the required port forwarding rules. Port forwarding lets you connect to specific virtual machines by using the Load Balancer frontend IP address and port number. UPnP was invented to automate this process. Under Protocol, select the option Both (this allows for both protocols to be. In order to allow data to be sent from the public internet to an internal computer, your device must therefore tell the router to forward on all messages that arrive on a particular port. This is where the ports will be forwarded to. But this can also cause problems for any application that needs information sent back to it from the internet the router will simply block it as a security feature. This is an essential security feature which prevents malicious requests from reaching services that might be running on your home network. Most ports are blocked by default on routers.
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