I have a broadband connection on WAN and an LTE modem connected to my WAN/LAN1 port. I need to configure it to only use the WAN/LAN1 port when the WAN port fails, but that's not how it's working. With current configuration it's always appearing to use the WAN/LAN1 connection, my connection speed and my external IP address are that of the LTE ISP.
Load balancing settings:
Link backup rule: