Give Proxmox access via one of its VMs

[hazefs]

Hello,
i bought an x86 appliance that have 6 x 2.5 Gb NIC my plan is to virtualize OPNSense as Router and other services ( like HA )

I've installed proxmox and OPNSense with the current configuration

NIC0 : Static ip ( used for access proxmox in case of failure ) -> 10.25.25.2
NIC1: OPNSense WAN ( PCI passthrough ) -> PPPoE -> Pubblic Address
NIC2: OPNSense LAN ( PCI passthrough ) -> DHCP -> 10.0.5.x

With NIC3, NIC4, NIC5 not used

Right now, Proxmox have no internet access and my goal was to give it through OPNSense , to accomplish that i've searched on web for two days without beign able to solve this.

This is what have done :

1. Created a new bridge ( vmbr2 ) with no physical port assigned
2. Added a new network interface on OPNSense VM (VirtIO) that uses vmbr2
3. Added a new interface on OPNSense called PROXMOX linked to the previously created VirtIO
4. Created a bridge with LAN and PROXMOX ( with dhcp enabled ) following this guide

afther that the configuration became :
NIC0 : Static ip ( used for access proxmox in case of failure ) -> 10.25.25.2
NIC1: OPNSense WAN ( PCI passthrough ) -> PPPoE -> Pubblic Address
NIC2: OPNSense LAN ( PCI passthrough ) -> DHCP -> 10.0.5.x
net0: OPNSense OPT1 (VirtIO vmbr2 )

On proxmox when i type dhclient -r i see from journal that all the dhcp requests going to timeout and infact i cannot reach OPNSense but cannot figure out why