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I have exactly same problem and i switched to pfsense they fix this and in nat rules there is a difference.

On automatic WAN NAT rule i get not only LAN ip adresses but also ip adress from wireguard ip that how wiregurad interface can communicate tunnel over WAN interface.

On opnsense its not there thats why its disconnect wireguard gateway automatically when changing default gateway to wireguard interface :P

Wireguard interface ip subnet must be in WAN NAT source rule

I solved it!
Everything working now

First set static ip on LAN eu0 interface to access opnsense gui and then create bridge eu0 and virtualinterface from proxmox and allow everything on bridge  interface in firewall and dhcp on bridge not on eu0 interface.

Now i got access to proxmox webgui 2x opnsense gui one direct for failback and one bridge ip and all devices can connect together in one LAN bridge perfect.
Bridge can work independent from lan interfaces i dont know that but that was the key.

Hi,
I have OPNsense on Proxmox and i would like to bridge virtual interface from proxmox with usb nic and have access to opnsense webui from that bridge.

wan = eu1 (usb android phone) - working got ping from opnsense to the world

i would like to make a bridge from command line not webgui
bridge0 (10.0.0.2) = eu0 (no ip - usb nic) + vtnet0 (no ip in opnsense - virtual proxmox subnet 10.0.0.1)

a put NAT/masquerade from wan to bridge0

in webui i create bridge0 and dhcp server on it.
dhcp server working i get proper ip adress when connect trought usb nic eu0 but cant connect to opnsense webui on ip adress of bridge0 (10.0.0.2)

whats the command for create bridge0 from console and nat?

automatic interface assigment working for only for psychical cant nat to bridge0 its not showing that interface

Thank you