I am migrating from EdgeOS (EdgeMax) to OPNsense. I don't understand the OPNsense UI/documentation on Source NAT.
In EdgeOS I have a simple rule that says:
- for inside source LAN address 192.168.x.x
- for destination port 25
- translate on WAN to IP one of my 5 fixed IP addresses
I have to recreate this on OPNsense, e.g. because the internal MTA must be outside DNS-correct when it connects to an MTA somewhere on the internet. When I edit an outbound NAT rule, I want to enter 192.168.x.x in some way in Source address, but I can't.
How do I create an outgoing NAT rule for a specific internal server (and destination port) and source-NAT it to a specific WAN IP address?
Answering myself: scroll up. The OPNsense GUI does something unexpected, when it opens up a drop-down, it opens it up somewhere in the middle. This I have have not encountered earlier, I was expecting it to open at the top and I only scrolled down.