I have a simple OPNsense system. One LAN, one WAN connected to a cable modem. My ISP is not very reliable and I want a backup connection for a critical host. I intend to add a 4G modem as WAN1 and follow the directions in the documentation for a multi-WAN setup. However I only want the one host to fallback to the 4G connection.
In "Step 4 - Policy based routing" it says to change the default LAN pass rule to add the WANGWGROUP as the gateway. Instead of this I intend to add another rule above this whose source matches my critical host and assign it the WANGWGROUP.
Will this work?
I don't see why not....