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T-Mobile NOK 5G21 Gateway and Netgear R8000P - Now DNS Problems
I was successfully using my Netgear Nighthawk R8000P router to connect to the internet through my Spectrum cable modem for a couple years. When I saw T-Mobile had a cheaper internet service than Spec...
Summary: I was having trouble getting to some subset of internet sites. I was getting what looked like DNS errors of some sort. I THOUGHT that this problem started happening when I started switching from my Spectrum internet service to T-Mobile's internet service. I THOUGHT things started going bad when I connected my T-Mobile NOK 5G21 gateway to my Netgear R8000P router. What I forgot about was, not too long ago, I DID upgrade my Netgear router to the most recent firmware version (V1.4.2.84_1.3.42).
In plemans' reponse to my posts, he suggested that the most recent version of the Netgear firmware might be having (or causing) some trouble with DNS resolution. Plemans suggested I update the Netgear firmware to an older version. So I downloaded firmware version V1.4.1.68_1.3.28. This was the firmware version immediately prior to the recent firmware upgrade. Much to my surprise and delight, this seems to have fixed this problem.
I am still working through some of the options plemans suggested regarding how to connect the T-Mobile gateway to the Netgear router. So far, the T-Mobile gateway configuration screens do not support bridge mode, a DMZ (at least, as far as I can tell). I am not sure I want to put the Netgear router into AP mode (I will lose too much functionality). I have connected (via ethernet cable) the T-Mobile gateway to the Netgear router and it all seems to be working OK. But I am almost certainly getting double NAT in this configuration (again, as plemans suggested).
Bottom Line: The main problem with the DNS resolution I think as been solved.
MANY THANKS to plemans for providing what looks like the solution to my problem.
Firmware Version: V1.4.2.84_1.3.42
2 things you can try if you're staying on the spectrum modem.
1. enable ipv6. then reboot the router/devices
2. downgrade the firmware a version. I've seen dns issues on the firmware version .
if you stay with tmobile, you can try the same but also it causes a double nat with the 2 routers.
A double nat happens when you cascade more than 1 router.
https://kb.netgear.com/30186/What-is-Double-NAT
Fixes? There’s 3 options but only use 1.
1. Put the modem/gateway in modem only/pass through mode. This disables its routing functions.
2. Leave the modem/gateway in router mode but put the Netgears IP address into its DMZ. This forwards the data to the netgear. You can either leave the modem/gateway’s wireless enabled or disabled. Just make sure its using a different wifi channel to prevent interference
3. Put the Netgear into access point mode. This disables its routing functions. Wifi/ethernet still works but it does disable some features.
https://kb.netgear.com/26765/Which-features-are-disabled-on-my-NETGEAR-router-when-it-is-set-to-AP-Mode
Questions:
1. How do I downgrade the router firmware?
2. You say that if I choose to stay with T-Mobile, I can try to "Put the modem/gateway in modem only/pass through mode". Are you saying to put the T-Mobile gateway into modem only/pass through mode? If so, I can try that, but the T-Mobile gateway has a limited number of options and controls. I haven't come across anything in its configuration screens (yet) that allows for that choice or option. I may have to reach out to T-Mobile tech support if I choose to go that way.
ServiceGear wrote:
Questions:
1. How do I downgrade the router firmware?----you download the firmware from the support site (downloads---->+view previous versions). Then follow the manual update process but use the older firmware. Pretty easy to do.
2. You say that if I choose to stay with T-Mobile, I can try to "Put the modem/gateway in modem only/pass through mode". Are you saying to put the T-Mobile gateway into modem only/pass through mode? If so, I can try that, but the T-Mobile gateway has a limited number of options and controls. I haven't come across anything in its configuration screens (yet) that allows for that choice or option. I may have to reach out to T-Mobile tech support if I choose to go that way. -----I just mean you'd need to use 1 of those 3 options to fix the double nat. You just have to use what works for your setup.
Summary: I was having trouble getting to some subset of internet sites. I was getting what looked like DNS errors of some sort. I THOUGHT that this problem started happening when I started switching from my Spectrum internet service to T-Mobile's internet service. I THOUGHT things started going bad when I connected my T-Mobile NOK 5G21 gateway to my Netgear R8000P router. What I forgot about was, not too long ago, I DID upgrade my Netgear router to the most recent firmware version (V1.4.2.84_1.3.42).
In plemans' reponse to my posts, he suggested that the most recent version of the Netgear firmware might be having (or causing) some trouble with DNS resolution. Plemans suggested I update the Netgear firmware to an older version. So I downloaded firmware version V1.4.1.68_1.3.28. This was the firmware version immediately prior to the recent firmware upgrade. Much to my surprise and delight, this seems to have fixed this problem.
I am still working through some of the options plemans suggested regarding how to connect the T-Mobile gateway to the Netgear router. So far, the T-Mobile gateway configuration screens do not support bridge mode, a DMZ (at least, as far as I can tell). I am not sure I want to put the Netgear router into AP mode (I will lose too much functionality). I have connected (via ethernet cable) the T-Mobile gateway to the Netgear router and it all seems to be working OK. But I am almost certainly getting double NAT in this configuration (again, as plemans suggested).
Bottom Line: The main problem with the DNS resolution I think as been solved.
MANY THANKS to plemans for providing what looks like the solution to my problem.