In this recipe, we will demonstrate how to troubleshoot issues related to the use of the directive client-config-dir. This directive can be used to specify a directory for so-called CCD files. CCD files can contain OpenVPN directives to assign a specific IP address to a client, based on the client's certificate. Experience has shown that it is easy to misconfigure this directive. In this recipe, we will make one of the common misconfigurations and then show how to troubleshoot it.
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's recipe Server-side routing at hand...