@d0ugmac1 I'm not sure how to setup link detection. I'm using an OC300 controller. I am able to consistently re-create this problem. When the backup wan does not have an internet connection...

@Virgo Yes, primary wan is working. Everything started working normally when I unplugged the backup wan Ethernet cable from the router. All devices (30+) are connecting to the internet with no...

Primary WAN = FIOS Backup WAN = 5G Hotspot with RJ45 port (not USB) Primary WAN is working fine. When backup WAN router/modem has issues such as being powered up but offline/loss of internet...