Fix Double NAT when two routers run at the same time

In most cases, Double Network Address Translation (Double NAT) does not affect Wi-Fi performance. But it can be an issue if you play online games or use port forwarding rules and Universal Plug and Play (UPnP). Learn more about Double NAT.

If Double NAT causes problems, you have a few options:

(Recommended) Remove ISP-provided router from your network 

If this router is independent of your modem, power off and unplug this router and directly connect your modem to your Google Nest Wifi router or primary Google Wifi point.

If this router is combined with your modem, enable bridge mode on your modem/router combo. This will take care of the potential Double NAT issue.

  1. Connect a computer directly to your router with an Ethernet cable.
  2. Log into your router or modem/router combo and find its settings to enable bridge mode.
  3. To access your router’s settings, you might have to open an internet browser and enter your router’s IP address in the address bar like this:

     

Steps will vary depending on the device. Many Internet Service Providers (ISPs) and manufacturers provide instructions on how to do this.

AT&T
Verizon

For the following modems:

  • VersaLink 7500 gateway
  • VersaLink 327W gateway
  • Actiontec 704WG gateway
  • Westell 6100 modem

Visit: http://www.verizon.com/support/residential/internet/highspeed/networking/setup/questionsone/123765.htm

For the Actiontec GT784WNV modem, visit: 
https://www.verizon.com/support/residential/internet/equipment/actiontec-gt784wnv

For the Actiontec MI424WR, visit:
https://www.verizon.com/support/residential/internet/equipment/actiontec-mi424wr

For the D-Link 2750B, visit:
https://www.verizon.com/support/residential/internet/equipment/dlink-2750b

Comcast

For Comcast Home users, follow the instructions in this help article: Enable or Disable Bridge Mode on a Wireless Gateway.

For Comcast Business users, contact Comcast Business support and ask them to set your modem to "Passthrough" or "Bridge" mode.

Time Warner Cable
(Not Recommended) Enable Bridge mode on your Google Nest Wifi router or primary Wifi point 

A single Google Wifi point or Google Nest Wifi router that is not part of a mesh system can be set to bridge mode.  Bridge mode disables the DHCP and routing functions so double NAT is no longer an issue. In bridge mode, this single mesh point will operate as a pure Wi-Fi access point connected over an Ethernet wire to the primary modem/router. Note: Bridge mode will only work if you’re using a single Nest Wifi router or Google Wifi point. If you’re creating a mesh network with multiple Wifi devices, your Nest Wifi router or primary Wifi point cannot be in bridge mode.

This is because the Nest Wifi router or primary Wifi point needs to control settings and communication within your Wi-Fi network. If it’s in bridge mode, in addition to losing mesh capability, you’ll also lose some of Google Nest Wifi or Google Wifi’s functionality:

  • Priority device will be unavailable.
  • DNS can’t be edited.
  • WAN settings can’t be edited.
  • Guest Wi-Fi will be unavailable.
  • Wi-Fi speed results in Network check will be unavailable (But download and upload results will still work).
  • Philips Hue pairing and controls will be unavailable on OnHub devices.

Additionally, bridge mode disables many of Google Wifi and Google Nest Wifi’s security protections. This is because your upstream router (the modem/router combo in the above scenario) is the one performing DNS steering, packet inspection, executable patching, etc.

Google Wifi and Google Nest Wifi’s automatic security updates maximizes your privacy and security. These protective features are most effective, and in some cases, only effective, when all traffic passes through your Nest Wifi router or primary Google Wifi point (instead of through another router).

If you have a third party router, you can wire a Nest Wifi router or primary Google Wifi point to it, then mesh additional Wifi points downstream. 

If you still want to turn your Nest Wifi router or primary Wifi point into a bridge, you can follow the steps below:

With the Google Home app

  1. Open the Google Home app Google Home app.
  2. Tap Wifi  and then Settings  and then Advanced Networking.
  3. Tap Network mode and then your Wifi router or point and then Bridge mode.

With the Google Wifi app

  1. Open the Google Wifi app .
  2. Tap the Settings and actions tab  and then Network & general.
  3. Tap Advanced networking and then Network mode and then your Wifi point and then Bridge mode.
  4. Tap Save.
You cannot transition your Nest Wifi router or primary Google Wifi point into bridge mode if your WAN IP is a public IP address. To enable bridge mode, there needs to be another router between your modem and your Nest Wifi router or primary Google Wifi point. If your Nest Wifi router or primary Google Wifi point’s WAN port has a public IP, that means it’s directly connected to your modem. In this scenario, the bridge mode option in the app will be unavailable.

Additional questions

What is Double NAT?

You can connect two routers to extend the Wi-Fi coverage in your home. But when you have two routers, each with their own private Wi-Fi network, your personal devices can have a hard time communicating with each other. This scenario is called Double NAT.

For example, let’s say you want to wirelessly print a picture from your computer. If you have two Wi-Fi networks, it’s possible that your computer is on one network while your printer is on the other. And if both networks are private, your computer won’t be able to tell your printer to print the picture.

Double NAT

This can also result in performance issues if you play online games or use port forwarding rules and UPnP.

To fix this, bridge mode lets multiple routers share one single Wi-Fi network. Here’s what that could look like:

Bridge mode

Double NAT isn’t necessarily a problem. For most people, Double NAT does not affect Wi-Fi performance. But it can be an issue if you play online games or use IP address assignments, port forwarding rules, and UPnP.

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