I have three nodes set up on my farm that monitor and control everything from the greenhouse to the solar systems and equipment in the barn. Node 2 connects to an Arduino Uno programmed as a web server to monitor and control some greenhouse equipment where as node 3 uses a serial to ethernet link to an Allen Bradley SLC 5/03 PLC which oversees and logs quite a bit of day to day activity in both the greenhouse, barn and alternative power sources. The attached photos show how I set up the port forwarding since it sounds very similar to your setup.
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