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I did not resolve it. It can be resolve with a complex routing, but i did not bother.

I think the solution is to add a custom route for outgoing internet traffic to pass by the OPNsense firewall, but it should have an exception for outgoing traffic coming from the OPNsense VM. I do not have the time currently to solve this issue.

For future reference, the issue was due to the target LAN interface not routing traffic to the source IP of the NATed connection to OPNsense by OPNsense:

source -> OPNsense -> target (on LAN)
source <- target (on LAN)

Not an issue in OPNsense configuration.

Hi,

i'm very new to OPNsense. I've installed OPNsense as a Proxmox VM, using virtIO network interfaces.

I'm trying to setup a very basic NAT port forward rule for SSH:

vtnet0 (wan): ip: 10.0.0.254
vtnet1 (lan): ip: 10.0.1.1

on lan connected to vtnet1: _target_: ip: 10.0.1.254 (fixed).

When logged in in OPNsense console, i can connect without issue to _target_, port 22 (namely SSH).

I created a NAT port forward rule allowing traffic connecting to 10.0.0.254:2222 to connect to 10.0.1.254:22 (see attached NAT configuration form).

This rule works partially (see attached live firewall logs screenshot), but the connection does not open. It stops after "let out anything from firewall host itself" rule.

Can someone help me trouble shouting this issue ? Thank you.