How to solve the double NAT problem? Detection and troubleshooting guide

Double NAT (Network Address Translation) can be quite annoying as it can lead to audio issues. For some people this is not really a problem as it does not affect the internet connection.

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Ethernet cables are seen on the back of a wireless router in Washington, DC, March 21, 2019.

However, double NAT may affect online gaming, port forwarding rules, etc. Specifically, it mainly leads to one-way audio issues, as well as unsuccessful call transfers, outgoing call error messages, faulty setup of talkgroups, periodically dropped calls, and other sound issues. .

According to Nextiva, double NAT occurs when two or more routers are on the same network. Although Internet and computer performance are not affected, it can cause VoIP issues.

How to solve the double NAT problem? detect it first

PC World explained how to detect the double NAT problem. First, you need to check the IP addresses. After that, check if there are private or public addresses (private IP addresses: to, public IP addresses to

How to solve the double NAT problem?  Detection and troubleshooting guide

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The new Vodafone LTE(L) broadband router and modem are displayed at the Vodafone booth at the CeBIT technology fair on February 28, 2011 in Hannover, Germany.

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Next you need to check if the traceroute has double NAT. You can do this by opening the command prompt and entering the code “tracert”. After that, click on the start menu and type “cmd”.

If there are two IP addresses listed in the traceroute, then double NAT is active.

Another method is to log into a router’s web GUI. This will allow you to see if the WAN IP address is private or public. If it is a private IP address, there is a double NAT.


Fixing the annoying problem of double NAT is quite easy to do. You can try different methods, and most of them are effective but not 100% accurate. Here are a few:

  • Unplug one of your routers. This will allow you to ensure that only one of them is active. But, you need to make sure that the remaining one is your ISP’s gateway.
  • Try putting the ISP’s gateway into relay mode or bridge mode. This will remove NAT, DHCP and firewall from the gateway.

If you want to see more troubleshooting tips for Double NAT, you can visit this link.

Recently, the co-inventor of Ethernet, David Boggs, died at age 71.

On the other hand, some ISPs have decided to offer multi-gigabit internet speed options.

For more information on routers, the Internet, and other related topics, always keep your tabs open here on TechTimes.

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Written by: Griffin Davis

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