@johnpoz I realize I might have to explain a little bit more.
LAN1 and LAN2 represents two separate networks on a train. Each LAN have a serviceport which I want to connect to the NG-1100 temporarily while doing service. So, NG-1100 and my solution is not a permanent solution, but a temporary that allows me to connect to devices on both LANs from a single point.
Moreover, on every train, the IP-addresses will be different since the supplier of the train have put the vehicle number as part of the IP-address.
172.15+C.T.x
10.T.C.x
Where C designates car number in the train, can be 1,2,3, or 6. And T designates the train number, can be between 1 and 60.
So the whole idea is to easily and quickly connect the NG-1100 to both service ports while entering the train for service reasons, and then connect the service laptop to the NG-1100. From there the service person can upgrade all software on different devices, download log files, or do other things.