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.