Joined: 24 Aug 2014 Posts: 26 Location: Pennsylvania
Posted: Tue Jun 04, 2024 13:43 Post subject: Double NAT Linksys WRT1900AC
At times I have problems accessing my desktop with other PCs on my home network. I did some network troubleshooting and the result was that I have double NAT. I have DD WRT, build 44048 on my Linksys WRT1900AC router. I have operating mode set as Gateway and from what I have been able to learn this may be my problem. I think it should be set to router. Am I right in my thinking? I am using a Netgear DM 200 Modem.
The *first* thing you need to do is upgrade to a more recent build. 44048 vestigial fallback build is no longer required and has unpatched vulnerabilities. You may wish to flash and stay on the last K4.9 release, or flash current release - but the most important thing to remember is you will be required to reset to defaults after you flash and reboot because the nvram variables have changed on certain bits.
Joined: 24 Aug 2014 Posts: 26 Location: Pennsylvania
Posted: Tue Jun 04, 2024 17:26 Post subject:
I thank you both. I will update as you suggested and go from there. Could you tell me if I was correct in setting the mode to router instead of gateway?
Joined: 24 Aug 2014 Posts: 26 Location: Pennsylvania
Posted: Thu Jun 06, 2024 3:09 Post subject:
My router is a WRT 1900AC ver1. Is r53633 the build I should install?
Is there a good tutorial on the process for updating to a new build? It has been quite sometime since I worked with dd-wrt and I want to do this correctly.
Which build depends on intended use and ISP bandwidth...
10 mbps, probably very slow by most standards. But we can stream movies pretty well, once in awhile it seems the resolution suffers, but mostly works well. It is just my wife and I and she does not use the Internet much.
Joined: 08 May 2018 Posts: 15243 Location: Texas, USA
Posted: Thu Jun 06, 2024 18:45 Post subject:
Your modem can be placed in modem mode only to remove double NAT, but double NAT shouldn't be your issue with connecting between devices on the LAN side of your WRT1900AC. Placing the modem in modem-only mode may require changing WAN connection type in DD-WRT, so if it is connecting to the internet just fine, I don't see a reason to change that. It could be other DD-WRT / Windows configuration issues or using such and old build. Need more information to determine the problem, specifically screenshots of DD-WRT configuration, including wireless, that apply.
