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Re: Unable to route to Internet on R7800 unless DHCP server is on.

AndyPast
Tutor

Unable to route to Internet on R7800 unless DHCP server is on.

I re-IPed my house with a range: 172.25.100.0/24

 

I changed the IP address on my router to 172.25.100.1

 

I changed my DHCP server (a pi-hole) to give out addresses between 172.25.100.100 and 172.25.100.251, with a gateway of 172.25.100.1.

 

I then rebooted the pi-hole and the router. Then I started to reboot devices.

 

And that's when the trouble started...

 

All my devices got a 172.25.100.x address.  DNS was set to 172.25.100.2 (The pi-hole IP) and the default gateway was 172.25.100.1.

 

With those settings NOTHING could get on the Internet.  I rebooted the router.  I rebooted the pi-hole. I double checked settings.  Nothing worked.

 

What finally did work, was to turn off DHCP on the pi-hole and turn on the DHCP on the router. Any IP address the router assigned could get on the Internet.

 

At this point I figured it was a security setting of some kind. So I went into Security→Access Control.  But Access Control was disabled. And devices I configured with static IP addresses could get to the Internet, but only when DHCP was on.

 

When my router was set to 192.168.1.1, I was able to use the pi-hole as a DHCP server. But with the new private address range, I was unable to do so.

Model: R7800|Nighthawk X4S AC2600 Wifi Router
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AndyPast
Tutor

Re: Unable to route to Internet on R7800 unless DHCP server is on.

Well, I fixed it.  It a case of the fat fingers.  The Pi-Hole default gateway had a comma instead of a period  in it.

 

So, it was DNS and human error.

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Message 2 of 5

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AndyPast
Tutor

Re: Unable to route to Internet on R7800 unless DHCP server is on.

Well, I fixed it.  It a case of the fat fingers.  The Pi-Hole default gateway had a comma instead of a period  in it.

 

So, it was DNS and human error.

Message 2 of 5
FURRYe38
Guru

Re: Unable to route to Internet on R7800 unless DHCP server is on.

Glad you got it working. Be sure to save off a back up configuration to file for safe keeping. Saves time if a reset is needed.
https://kb.netgear.com/24231/How-do-I-back-up-the-router-configuration-settings-on-my-Nighthawk-rout...
Enjoy. 📡

 

Message 3 of 5
AndyPast
Tutor

Re: Unable to route to Internet on R7800 unless DHCP server is on.

Thanks for the tip.  I'm debating getting a WiFi 6 router.

Message 4 of 5
FURRYe38
Guru

Re: Unable to route to Internet on R7800 unless DHCP server is on.

One could get something WiFi 6 or 6E and connect in AP Mode via ethernet connection to the R7800 if you want to keep the R7800 working as a router. 

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