OPNsense on bridge not working - single ip host

E

engen84

New Member
Feb 27, 2025
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Hi!

Been trying to get my Proxmox setup with a OPNsense as firewall and router. Where vms can connect to and be NAT:et out.

Cant seem to get it to work, have tried so many diffrent approaches but still no luck.

I have currently configured my Proxmox:
Bash: 
auto lo
iface lo inet loopback

iface ens18 inet manual
    up sysctl -w net.ipv4.ip_forward=1

    
auto vmbr0
iface vmbr0 inet manual
    bridge-ports ens18
    bridge-stp off
    bridge-fd 0
        
auto vmbr1
iface vmbr1 inet static
    address 192.168..1/24
    gateway 111.11.1.2
    bridge-ports none
    bridge-stp off
    bridge-fd 0
    
source /etc/network/interfaces.d/*

The opnsense is configured with vmrbr0 as WAN and vmbr1 as LAN.
Static IP for WAN 185.xx.243.xxx/24
Static IP for LAN 192.168.10.1/24


The VM has config
1740670104872.png


I have tried e1000 as nic for the vm but same result.

Can anyone please help me?
 
Hello, there's a typo in the IP address 192.168..1! And a gateway must be in the same subnet!
 
Last edited:
wecanIT said:
Hello, there's a typo in the IP address 192.168..1! And a gateway must be in the same subnet!
Click to expand...
Hi! Thanks for replying.

I did not copy the interfaces file, just wrote it off my self.

So the present file on the host does not have the typo and the gateway is correct.
Code: 
auto lo
iface lo inet loopback

iface ens18 inet manual
    post-up sysctl -w net.ipv4.ip_forward=1

    
auto vmbr0
iface vmbr0 inet manual
    bridge-ports ens18
    bridge-stp off
    bridge-fd 0
        
auto vmbr1
iface vmbr1 inet static
    address 192.168.10.2/24
    gateway 192.168.10.1
    bridge-ports none
    bridge-stp off
    bridge-fd 0
    
source /etc/network/interfaces.d/*


Above is the exact content of the interfaces file.

I can ping the 192.168.10.1 from my pve-host.
And I can ping 192.168.10.2 from OPNsense, but not my WAN-gateway.

Anyone that has any idea on how to proceed? If I need to provide more info, please tell me.
 
How is the opnsense connected? As hardware or as a VM? Is the WAN connected to the opnsense via pathtrue? There are a lot of variables.
 
wecanIT said:
How is the opnsense connected? As hardware or as a VM? Is the WAN connected to the opnsense via pathtrue? There are a lot of variables.
Click to expand...
Oh, I didn´t write that my Proxmox is running as host where OPNsense is a VM.

I only have 1 NIC on the proxmox, so therefor I put the vmbr0 without IP and my NIC ens18 as bridge port.

The ens18 is connected to WAN.

My OPNsense configured as the image I attached to my OP.

A virtio-netdevice vtnet0 which is bridged to vmbr0 on the proxmox.
Also a vtnet1 that is bridged to vmbr1 on proxmox.
 
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