RAX54 internet connection not secure

[jlwaldrup]

See original Case number 46693438 in product support.

Frontier Fios is ISP (originally Verizon).

Verizon Gateway router model GS1100.

Netgear router is Nighthawk AX6                   AX5400 6-stream WIFI router    Model RAX54

LAN cable out from GS1100 to input port for Nighthawk router.

LAN cable out to windows 10 desktop pc.

wireless connection for windows 11 laptop to Netgear40-5G.

Bitdefender VPN installed on both.

VPN gives error code 12 for both computers and will not connect.

Web address bar indicates sites are not secure on both pc and laptop.

Internet connections secure if I switch LAN connection and wireless connection back to Verizon router.

This setup worked for 2 months and suddenly quit working several days ago. 

[FURRYe38]

Your ISP Modem already has a built in router and wifi. This would be a double NAT (two router) condition which isn't recommended. 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 option #2 first...

[PaulGo]

FiOS and other fiber connections do not use a modem the ONT acts as a modem.  If you are just using internet you can connect the RAX54 directly without the G1100.  If you need the G1100 for TV or telephone then this thread may help:

https://community.verizon.com/t5/Home-Internet-Fios-and-High/Bridge-G1100-So-Your-Router-Becomes-Pri...