multiple routers

Hello, my PVE node has 3 NICs, none is supporting PCI Passthrough. One VM should run OPNsense as additional router in the lab. My ISP provided a router incl. modem that does not support VLAN. Port 4 of this router provides a guest LAN 192.168.179.0/24 that is logically separated from LAN. eno1...

I have 3 NICS connecting to separate Routers and out to separate Internet connections. I have set up the additional bridges vmbr1 and vmbr2, given them the required subnets and linked them to the physical NICS, see screenshot. vmbr0 has the 'Default Gateway' on it, and I know I cannot put...