If your ISP gateway cannot be put in bridge mode, the usual way to stop a second router from doing NAT is to switch that downstream router to Access Point (AP) mode—if your model supports it. The ISP gateway then handles routing, while the second device provides Wi-Fi and wired connections. Check both devices’ instructions first: menu names, setup steps, and available features vary by model.
What double NAT means—and when it matters
Network Address Translation (NAT) lets a router connect devices on a private network to the wider internet. Double NAT occurs when two devices on the connection perform NAT, commonly an ISP gateway followed by a separate router. Because they can create separate private networks, devices on opposite sides may be harder to reach from one another.
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Double NAT is not automatically a performance problem. Google Home and Nest Help says most people do not notice a performance effect; it describes any added delay as on the order of milliseconds, without giving a specific range. The configuration can matter for online gaming, port forwarding, UPnP, or communication between devices on separate private networks. NETGEAR also lists possible issues with VPN connections, port forwarding and triggering, and some secure websites. These are potential symptoms, not proof that double NAT is the cause.
Check your network layout before changing settings
The common setup is ISP gateway first, then your own router. Double NAT is plausible if both devices are routing, but check their status pages or configuration if available. A second router used only as an access point is not the same as a second router performing NAT.
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If your goal is simply to extend Wi-Fi coverage or add Ethernet ports, another router in routing mode may not be necessary. NETGEAR notes that an extender, mesh system, or unmanaged switch may better fit those needs.
Switch the downstream router to AP mode
AP mode is the practical option when bridge mode is unavailable on the ISP gateway and the second router supports AP mode. In this arrangement, the gateway remains the router; the downstream device stops handling routing and NAT. The precise setup—including how to connect the devices and handle the downstream device’s IP address—depends on its manufacturer and model.
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- Find the mode setting. In the downstream router’s administration settings, look for “Access Point mode,” “AP mode,” or a similar operating-mode option. Not every router offers it.
- Follow the model-specific setup. Apply the router maker’s instructions for the uplink connection and IP-address settings. For the NETGEAR models covered by its guide, the example path is Advanced > Advanced Setup > Wireless AP; labels and menus may differ on other models. NETGEAR’s example uses a dynamically assigned address from the existing router.
- Account for the gateway’s Wi-Fi. In its guidance for a NETGEAR router connected to an ISP gateway, NETGEAR says to turn off the gateway’s Wi-Fi when the NETGEAR router is used in AP mode. This is vendor-specific advice, not a universal requirement; check your gateway’s instructions before changing its wireless settings.
- Reconnect and check the original problem. Once the configuration is applied, reconnect devices and check the issue that led you to make the change—for example, whether devices can reach each other or whether a game or port-forwarded service works.
For model-specific guidance, see NETGEAR’s AP-mode instructions and ASUS’s explanation of router operation modes. Confirm your particular model supports the mode before relying on a generic menu path.
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Know which features may change in AP mode
AP mode changes which device controls network functions. The ISP gateway takes over routing, and features on the downstream router may become unavailable. The exact changes are model-specific:
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- NETGEAR says guest network, website blocking, VPN service, and remote management are disabled on the routers covered by its AP-mode guidance.
- ASUS describes its AP mode as disabling firewall, IP sharing, and NAT by default.
These examples are not a universal list. Check the documentation for both devices to see which settings and services remain available in your setup.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.AP mode versus bridge mode
Both approaches can remove one layer of routing, but they do so on different devices. Bridge mode on the ISP gateway, when available, disables its routing so the downstream router can handle it. AP mode instead leaves routing with the gateway and turns the downstream router into an access point.
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- Routing control: AP mode leaves it with the ISP gateway; bridge mode gives it to the downstream router.
- Features: AP mode may disable features on the downstream router. Bridge mode may preserve that router’s routing features, while affecting gateway-specific services. Check with your ISP and consult the device manuals before choosing.
- Availability: Support for either mode depends on the exact equipment and, for gateway settings, the provider’s configuration.
Sources and model-specific details
- Google Home and Nest Help: Fix double NAT when two routers run at the same time (accessed October 7, 2026; publication date not shown).
- NETGEAR Support: How do I fix problems caused by my NETGEAR Orbi or Nighthawk router connected to an ISP gateway? (last updated July 7, 2025).
- NETGEAR Support: What is the difference between router mode and AP mode? (last updated July 7, 2025).
- ASUS Global Support: Introduction of Operation Mode (last updated January 28, 2026).
- NETGEAR Support: Installing a NETGEAR or Orbi router after enabling bridge mode or turning off Wi-Fi on an ISP gateway (last updated October 17, 2025).
- NETGEAR Support: How do I change my NETGEAR router to AP mode? (last updated July 7, 2025).
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