It all started because I wanted to use Pi-hole... :LOL:

[mikes91]

I use Verizon 5G Home Internet and their XCI55AX cell router. My journey to OPNsense started when I decided I wanted to use Pi-hole but the XCI55AX router will not allow the end user to change the DNS settings, so what I must do is put their router in passthrough mode and use my own router instead.

If anyone has already done this, I would appreciate whatever you are willing to share regarding the appropriate configuration settings. I've gotten as far as installing OPNsense VM on my Proxmox installed mini-pc (a Beelink SER5 Ryzen 7 5825U) and poking around a bit to get oriented.

Any and all advice/pointers will be appreciated.