Double NAT

What is double NAT?

NAT lets several devices share an internet-facing IPv4 address. Double NAT means traffic passes through two layers of address translation. One example is your own router plugged into a provider's box that also acts as a router.

Double NAT often works without a noticeable problem. Google's guidance explains when it can matter, including some games and incoming connections. Its presence alone does not explain a slow call.

Check whether it affects your task

Write down the app's exact error and what fails, such as joining a game or reaching a home service from outside. If your usual tasks work, there is no need to change the network just to remove this label.

If a task fails, give the provider or app's support team the models of both boxes and how they connect. Ask them to confirm the cause before changing routing. Translation inside the provider's network cannot necessarily be removed with a home-router setting.

Before changing router modes

A provider may suggest bridge mode on its box, or the maker may support access point mode on your own router. These choices change which box manages the home network. They are not interchangeable on every mesh system.

Ask for instructions for the exact models, including any account details or connection values required, which cable goes into which port, and how to return to the old mode. Check whether provider phone or TV service, parental controls, or mesh features depend on the current setup.

Save the old configuration and cable layout. Schedule downtime for everyone using the network, then test the original app and other household services. If the change fails, follow the agreed restore steps or contact support. Do not use a factory reset as a routine undo step.

Do not use DMZ as a beginner workaround: it broadens incoming exposure and does not remove the second NAT layer.