Hi Kyle,
Thank you for the reply.
The device I am trying to connect is a Siemens MindSphere Nanobox (basically a specialized PC for IIoT). This device has one ethernet interface for its internet connection and a separate ethernet interface for its connection to the local network, where it will gather data to be pushed to the cloud. These ports can both be connected to the same network but both must be used and given their own addresses.
As you mentioned, I would like to have access to all devices on the LAN of the flexy through the VPN connection, but only allow internet access to the Nanobox. Is there a write-up somewhere on how to setup DNS or static routing on the flexy 205?