OpenVPN and access to a remote IPCOP over IPCOP-to-IPCOP VPN

1. Zerina Part
   • You must have the latest Zerina Alpha (ZERINA-0.9.7a14-Installer.tar.gz as of this writing)
   • In the Zerina Advanced Server Options screen and under the Additional Push Route section, in the first box type in the IP / Subnet of your Remote IPCop Green network. There are 6 boxes I only filled in the 1st box.
     e.g. 192.168.0.0/255.255.255.0
   • Saved Advanced Options
   • Start your OpenVPN Server
2. IPCop VPN Part
   (I used IPCops VPN to connect my 2 Networks. If you used Zerina/OpenVPN then make the same changes there)
   • You must create a 2nd VPN tunnel between your 2 networks. So, of course, you must make changes on both ends.
     Basically you are going to make a duplicate Net To Net VPN tunnel that will connect your 2 sites. However, you are going to substitute your Local Green Subnet information with the OpenVPN subnet. What this does is creates a new entry in the routing table telling it how to handle packets from the Roadwarrior subnet.

                 E.g.
                     * Local Green Subnet 10.1.99.0/255.255.255.0
                     * OpenVPN subnet 10.209.196.0/255.255.255.0
                     * Remote Green Subnet 192.168.0.0/255.255.255.0

     
     My Setup

                     * VPN Connection #1
                           o Local Side with OpenVPN Server
                             Right
                                 + Local Subnet: 10.1.99.0/255.255.255.0 – Green Subnet
                                 + Remote Host: 222.x.x.x
                                 + Remote Subnet: 192.168.0.0/255.255.255.0
                           o Remote Side
                             Left
                                 + Local Subnet: 192.168.0.0/255.255.255.0
                                 + Remote Host: 221.x.x.x
                                 + Remote Subnet: 10.1.99.0/255.255.255.0 – Green Subnet from Right

                     * VPN Connection #2 with OpenVPN Subnet Information
                           o Local Side with OpenVPN Server
                             Right
                                 + Local Subnet: 10.209.196.0/255.255.255.0 – OpenVPN Subnet
                                 + Remote Host: 222.x.x.x – Stays the same
                                 + Remote Subnet: 192.168.0.0/255.255.255.0 – Stays the same
                           o Remote Side
                             Left
                                 + Local Subnet: 192.168.0.0/255.255.255.0 – Stays the same
                                 + Remote Host: 221.x.x.x – Stays the same
                                 + Remote Subnet: 10.209.196.0/255.255.255.0 – OpenVPN Subnet from Right

Make sure both LANS are connected on both Net To Net VPN Tunnels. Reconnect your OpenVPN Client. Ping the remote network from your OpenVPN Client computer.