OK,

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.
https://kb.netgear.com/20927/How-do-I-change-my-NETGEAR-router-to-AP-mode

Try option # 2 first with the RAX.

Or go for easy and try option #3

THeOrbix wrote:

If your seeing 10.xomething on the LAN side then the RAX is connected to something upstream that is already using 192.168.1.1 and the RAX will see this and avoid it by auto changing to 10.something.

Yes FURRYe38, this is exactly my situation. To recap:

- The home modem is connected to my FTTH link.

- The modem is manufactured by ZTE, it has been provided by my ISP provider (Fastweb, an Italian company, I'm living in Italy)

- The modem has DHCP enabled and issues addressess starting from 192.168.1.50

- The RAX20 is connected to the modem via Wifi, it receives the 192.168.1.51

- The RAX20 has DHCP enabled and issues addresses in the 10.0.0.x range to all connected devices (inlcludes those that are repeatedly "losing their IPs" and failing to reconnect).

Forum Discussion

RBR850 backhaul out of sync