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Need help with a complex project. I am able to use OpnSense firewall but as a single WAN interface and hand it off downstream to a router. However, when this is the case, I run into issues with routes and gateways since I can't see specifics.

Instead, I've been trying to figure out how I can have the OpnSense firewall merely do its job on two WAN interfaces being bridged (via Proxmox on same machine) to my OpenWRT router.

I read the manual and saw there was some information about MultiWAN, but I do not want OpnSense to do any failover/load-balancing. Just follow my firewall rules and and move WAN# 1-2 down to OpenWRT. Have not been able to get it to play nicely - either I will lose connectivity to OpenWRT or one of the interfaces will be lost.

Machine running Proxmox has 3 NIC's (two for WAN, one for LAN).

Hey,
This might be a bit of a reach for most of the pro's out here...but I've grown to enjoy the VPN Profile configurator's like the one from the Asus routers. It's basically a nice GUI that allows you to [graphically] select which devices are transmitting traffic through which tunnel (assign profiles).

Does anyone know if there's anything like that available?

Here's a few pics from the non-Merlin FW's, but each is somewhat different aesthetically.
https://www.asus.com/us/support/faq/1011232/