I'm trying to access remotely a device (in this case a PLC) through a 3G/4G internet connection. I have a Raspberry PI connect to the internet with a 3G modem and a OpenVPN configured on it. The eth0 port is connected to the 3G/4G modem and the eth1 port is connected to the PLC.
How do I add the eth1 port to the VPN connection so I can access the PLC trough any computer connected to this VPN?
This images may better explain what I'm tryng to achive: physical connections virtual connections
