Cheap but Manual, backup internet uplink

Situation; Customer is without internet for 20+ hours and fails to call us and ask if we can help.

Hardware required:
Firewall tested with Fortigate (40x series needs extra steps to set a port as Wan2)
USB-C to Ethernet adapter/dock, ideally with power pass thru. looks like this
Android cell phone with data plan. Tested with Samsung S21. May work with Apple + Lightning but I don’t know the settings.

Firewall Setup:
Setup your firewall Wan2 as DHCP,
setup an alternate route through Wan2 interface,
Rules to allow Internal to Internet via Wan2

Phone Setup:
Plug the Ethernet dock into Cell phone Usb-C port
Settings, Connections, Mobile Hotspot and Tethering, Ethernet tethering (this will only be lit up when a compatible adapter/dock is plugged in)

Link:
Plug a USB power supply into the Power Pass Thru port of the Ethernet dock. Being a Hotspot/Router will drain your battery fast.
Now connect an ethernet cable from the Ethernet dock to the Wan2 port of your Firewall

Your network should now be able to get to the internet as normal.
I would avoid streaming media as this link isn’t going to be as fast as your normal connection and a lot more expensive.

sduncan