When I initially setup my OPNsense router, I did not setup the WAN interface. As such, now when I click on WAN, it has no settings and shows the Assignment page instead. I'm fine with that as I would like to create my own custom WAN/NAT interface anyways.
But, how do I do that? At the moment, I have an interface named WAN_rtr1_Cox_01. It is basically setup as a (LAGG) LAN interface at the moment. How do I make it to be a WAN/NAT interface, preferably subject to automatic rules, etc.??? The documentation doesn't seem to provide much guidance on this matter. It will have a static ip4 and dynamic ip6 address.
First off, turn off DHCP on it. Select it under the Interfaces menu and give it the IPv4/v6 settings it needs. Then under settings/gateways add it as a gateway.
Edit: I should mention you can rename it too.