Missing return routes when iroute is used

This recipe is a continuation of the previous one. After ensuring that a single VPN client can reach the server-side LAN, the next step is to make sure that other hosts behind the VPN client can reach the hosts on the server-side LAN.

In this recipe, we will first set up a VPN as is done in the Routing: subnets on both sides recipe from Chapter 2, Client-Server IP-Only Networks. If no return routes are set up, then the hosts on the client-side LAN will not be able to reach the hosts on the server-side LAN and vice versa. By adding the appropriate routes, the issue is resolved.

Getting ready

We use the following network layout:

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 6 Linux and OpenVPN 2.3.11. The client was running Fedora 22 Linux and OpenVPN 2.3.11. Keep the configuration file example2-5-server.conf, from the Routing: subnets...