I'm looking for some enlightenment / validation on the best way to approach this problem.
I've several measurement devices that are connected to a computer (call it the "main" computer) using Ethernet cables and a simple switch. That computer then responds to data requests from other computers in the same LAN, using a specific protocol, on a specific port, and sends that data (originated from the measurement devices) back to those computers using the same protocol and port. To clarify, the other computers never communicate directly with the measurement devices and only get data from the "main" computer. The problem is that in some locations, due to some rigorous security options that I've no access to, there is only one LAN IP address and one network cable/port available to connect the measurement devices and the main computer.
Since the main computer acts as a link between the other computers in the network and the measurement equipments, I'm thinking that this could be solvable using NAT and Port Forwarding: get a router, connect the available LAN cable to it's WAN port, and set it up to use the only available LAN IP as it's WAN IP. Then connect the main computer and measurement devices to the router (directly or using a switch) in order to create a subnetwork managed by the router, and have it forward all requests on the protocol port to the "main" computer.
Now there are a few things in this configuration that I'm not sure will work, namely using a LAN IP as a WAN IP, and would appreciate input from someone with more knowledge.
The Main computer runs Windows 10 Pro, and I'm also wondering if the computer could act as the router (meaning adding NAT capabilities to Windows 10) instead of adding an actual router to the configuration, which might be a bit of an overkill for what is needed.