Connecting Router to modem router

[santoshreddy3]

Hi,

  I have bought Nighthawk AX4300 router. I have an existing Netgear modem router device. I'm looking for instructions to connect new router to existing modem router device. I tried connecting but getting security error while accesing the websites. 

[FURRYe38]

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.
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.

RAX##? AX4300 is not a model number. 

For any RAX## routers, Netgear has set up a community forum specifically for the NightHawk RAX WiFi 6 Router products:
https://community.netgear.com/t5/Nighthawk-Routers-with-WiFi-6-AX/bd-p/en-home-routers-nighthawk-wif...

Please use this link to the main forum product list to review and choose where to make your posts. 
https://community.netgear.com/t5/NETGEAR-Forum/ct-p/en-netgear

]
Thank you.