After setting up OpenVPN successfully for the very first time, it is very common to misconfigure the network routes for the VPN. In this recipe, we will first set up a basic TUN-style VPN as is done in Chapter 2, Client-server IP-only networks. At first, routing will not work until the right routes are added. The purpose of this recipe is to describe how to troubleshoot such a routing error.
We use the following network layout:
Install OpenVPN 2.0 or higher on two computers. Make sure the computers are connected over a network. Set up the client and server certificates using the first recipe from Chapter 2,