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Forum Discussion
server IP address could not be found
Router R7900P
Firmware v1.4.3.88_1.3.50
OS / multiple
ISP AT&T with a gateway router Model: 2Wire 5268AC
I have been getting the error above in the subject line for about 6 months or so for URLs which require some level of authentication - https. It can be persistent for some sites but others I can manage to get past this error by refreshing the page. Seems like a timing issue, perhaps.
My router setting are pretty basic. I've been using this setup for four years without any issues except for the past 6 to 8 months.
I tried using the cloned MAC as was suggested in another post, but that didn't resolve the issue.
I feel I've isolated this down to a netgear issue as I have bypassed the netgear router and not seen the issue when I'm using the AT&T device as a router and not a gateway.
Any help would be appreciated.
8 Replies
Your modem already had a built in router and wifi. This would be a double NAT condition which isn't recommended. https://kb.netgear.com/30186/What-is-Double-NAT
https://kb.netgear.com/30187/How-to-fix-issues-with-Double-NAT
Couple of options,
1. Configure the modem for transparent bridge or modem only mode. Then use the NG router in router mode. You'll need to contact the ISP for help and information in regards to the modem being bridged correctly.
2. If you can't bridge the modem, disable ALL wifi radios on the modem, configure the modems DMZ/ExposedHost or IP Pass-Through for the IP address the NG router gets from the modem. https://kb.netgear.com/25891/DMZ-on-NETGEAR-routers
https://kb.netgear.com/24086/How-do-I-set-up-a-default-DMZ-server-on-my-Nighthawk-router
3. Or disable all wifi radios on the modem and connect the NG router to the modem, LAN to LAN configure AP mode on the NG router.Try #2 first...
#1 isn't an option with AT&T so I attempted #2.
I have set a DMZ on the AT&T router with the router as the permissible device. After a reboot of both routers, it works great for a little while.
And then it starts behaving in the same way. I don't want to move to option #3 as I really prefer managing everything through Netgear. Plus I use my guest wifi for my company provided equipment and I will lose the guest wi-fi if I go Lan-to-Lan.
As I may have stated earlier, I had my NG subtending off of my AT&T router for 4 years and it was never a problem until this year.
AT&T my service and I received a new router, Arris BGW210-700.
This router allows me to manage more configurations within the gateway router. I have configured an IP passthrough. The problem still persists. I still don't prefer to go with the Netgear as AP route.
Here are some notable observations:
- After power-cycling my entire network in the order of ATT, Netgear, LAN devices, the problem seems to be resolved. About 20 minutes later it resumes. If it was a double NAT issue wouldn't it be consistent?
- It happens on Windows (work and personal) and some smart TVs. My wife says it happens on her Macbook, but I have not observed it. I cannot replicate in on my MacPro.
- It happens more frequently on Chrome and Edge. Infrequently on Firefox. It only happens on https sites.
Do you have IP Pass thru setup fully on the modem for the NG router?
Is the wifi fully turned OFF on the modem?
Try enabling IPv6 on the router as well.
What CAT# LAN cable do you have between the modem and router? CAT6 is recommended.
Has a factory reset been performed since last FW update?
The AT&T wifi is off and has been.
The IP Passthrough is set up correctly.
It's a cat-5 cable between the two.
I've set up Ipv6 as per your recommendation. And it seems make the sense to try.
So far it seems to have worked. I'm going to give it a few more days of checking. I'll check back in.
