Hi ROY HICKS61:
If you still require assistance, please let us known your Windows operating system, Internet Service Provider (ISP) and make/model of your router. Was this router supplied by your ISP or have you purchased a third-party router (D-Link, Linksys, Netgear, etc.), and do you know if your router connects to another WiFi modem or broadband gateway provided by your ISP?
If you have a Windows 10 operating system include the version and build (see the How-To Geek article How to Find Out Which Build and Version of Windows 10 You Have) and let us know which troubleshooter(s) at Settings | Update & Security | Troubleshoot you ran. You've posted your question in the Windows Vista board of this forum, we'll ask the Forum Mods to move your question to the correct board if you have a different OS.
In the mean time, you might find some helpful information in the PCWorld article How to Identify and Resolve Double-NAT Problems, which states in part:
"...Having more than one NAT device usually happens when you connect your own router to a gateway installed by your internet service provider (ISP) that also includes the NAT and routing functions. Some ISPs install only a simple modem that lacks the NAT and routing functions, which eliminates the problem altogether. But most ISPs assume their customers don't have routers, however, so they’ll provide you with a combo device whether you want it or not..."
If you purchased a third-party router the support site for your ISP might also be able to provide guidance. For example, my ISP is Shaw Communications (Canada) and their support article How To: Set Up a Third Party WiFi Router explains how customers can bridge a third-party router to a Shaw modem.
32-bit Vista Home Premium SP2 * Firefox ESR v52.9.0 * Norton Security Deluxe v22.15.2.22
HP Pavilion dv6835ca, Intel Core2Duo T5550 @ 1.83 GHz, 3 GB RAM, NVIDIA GeForce 8400M GS