I can’t see anything in logs, although I didn’t check deeply.
The fact is that I’ve tested with a linksys router (very simple router) and the port forwarding works as expected. That discard isp cg-nat.
This is linksys router tested with grc.com
But coming back to ipfire the result is the same, it doesn’t work.
I don’t know what could be the problem. I need to resolve this because I’m planning to install security cameras, and I need to access them from internet.