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| Subject |
Solving a Double-NAT networking issue |
| Author |
Eric McIntyre |
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Networking issues with Double-NAT
What is a Double-NAT?
Answer: A Double-NAT setup is typically 2 firewalls (routers) on your Home LAN or Small Business network. This Double-NAT setup typically causes port blocking issues that block incoming requests bound for your Web Server, Mail Server and other devices such as a NAS or IP Camera.
If you want to remotely view an IP camera at your home or business, or host a web server, mail server or file server, you need to solve this Double-NAT problem. Each network setup is different but we have created some PDF files that show examples of some typical Double-NAT setups. Find the setup example that looks most like yours and you'll find the solution at the bottom of each example.
Cable Modem Example – Double-NAT caused by adding a VOIP/Vonage router
DSL Modem Example – Double-NAT caused by your DSL modem also being a router
DSL Modem Example – Double-NAT caused by adding a VOIP/Vonage router
Keep in mind that these are only a sample of what a Double-NAT can look like. You could even have a combination of these or even a Triple-NAT. These examples should guide you in the right direction to fix the problem and try again.
Note: Instead of actually moving the devices on the network as a fix, you could forward all the ports along the way through each NAT/Router. This is more complicated and takes longer to achieve your results. If you do decide to forward the ports through each router, be sure that the second router in the chain uses a STATIC LAN IP in the same range as the first router in the chain or you may “break” the port forwarding during an IP change on router #2.
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