WAN Failover to USB LTE... failing
I recently acquired a Pantech UML295 USB LTE modem (Verizon) and have connected it to my Protectli firewall box. pfSense recognizes the device and shows the USB_LTE gateway as up (I see very minute amounts of traffic on the traffic graph) and I've configured WAN Failover per the official Netgate docs, but when I try yanking my primary WAN cable, all traffic grinds to a halt.
I did test the USB modem in my Windows laptop and connectivity worked as expected, so I know at least that much works. I even tried removing the "Block RFC 1918 networks" rule from the USB_LTE device just in case there was something there that was blocking connectivity on the 192.168.32.x network, but I can't for the life of me figure out where the issue if or how to troubleshoot.
Has anyone gotten a similar configuration to work? At this point I'm trying to decide if the issue lies with pfSense or with the modem.