Preamble OpenVPN is an open source project to provide Virtual Private Networking connections between clients and remote networks via the Internet (as an example). There are many use cases for VPN, today though we'll look at using VPN to connect a remote engineers laptop/PC to a site LAN for the specific purpose of remote monitoring and control using Mitsubishi tools such as GX Works and GT Designer, which is a mode I refer to as "device mode". An example of a VPN in “ device mode ”… Devices on both ends of the tunnel will be as though on the same network. Note! If OpenVPN is built into your device, as in this case a TP-Link ER605 VPN Router, then it can be used for free, and in conjunction with the remote client also using the free OpenVPN Connect app. Requirements There are three aspects to creating a VPN solution… Establish a VPN Server (whether home with hardware or a cloud service) Download and install a VPN Client for the required operating system/device Utilise a...