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, Client-server IP-only Networks. For this recipe, the server computer was running CentOS 5 Linux and OpenVPN 2.1.1. The client was running Fedora 13 Linux and OpenVPN 2.1.1. Keep the configuration file, basic-udp-server.conf
, from the Chapter 2 recipe Server-side routing at hand, as well as the client configuration file, basic-udp-client.conf
, from the...