Hi, @automatyk3
I had a custumer at oct/2024, that try to use ?NAT to do what you are trying to do.
I am not a PCL engineer… and because I just have a few hours to help him… I choose to build a route network /29 for the ( three) small PLC and /25 for the " main " PLC.
It worked… and I build this network, over WiFi with RUT200.
small PLC
“main” PLC
I don’t know your network/project.
But… The solution that I provide to the customer, maybe will solve the problem.