The shortest setup possible
This recipe will explain the shortest setup possible when using OpenVPN. For this setup, you require two computers that are connected over a network (LAN or Internet). We will use both a TUN-style network and a TAP-style network and will focus on the differences between them. A TUN device is used mostly for VPN tunnels where only IP traffic is used. A TAP device allows all the Ethernet frames to be passed over the OpenVPN tunnel, hence providing support for non-IP based protocols, such as IPX and AppleTalk.
While this may seem useless at first glance, it can be very useful to quickly test whether OpenVPN can connect to a remote system.
Install OpenVPN 2.3.9 or higher on two computers. Make sure the computers ...