If you have enabled the OpenVPN server to push DNS and DNS domain information to clients, when you connect, you will be able to access systems on the remote network by their computer names directly rather than IP addresses. That’s it! You can save the preferences for this profile go to the Shimo menu icon, and select the new OpenVPN network from the list, and Shimo will establish the connection. You can also elect to send keep-alive packets every few seconds to ensure the connection stays up (i.e., maybe send a keep-alive packet ever 120 seconds or so). Set Compression to Automatic, and enable Automatic Reconnection. Ensure the Tunnel Device is TUN and the Protocol is UDP ( Figure B) unless you have changed the connection port on the server, leave it at the default 1194. In the Connection tab, enter in the name of the remote host (i.e., ). There is no need to set the username and password unless it is required by the server (for the purposes of this series, we elected to use just certificates without further authentication mechanisms).
Make sure the Authentication Method is set to Certificate ( Figure A). In the Authentication pane, you will need to select your Certificate Authority file (ca.crt), Local Certificate (client.crt), and Private Key File (client.key). Under the General tab, name your new connection - something like “OpenVPN Home” would suffice. In the Profiles pane, add a new OpenVPN profile. Next, start Shimo and head to the Preferences.
If not, you will need to obtain them from the server, where they would have been generated, and securely copy (using SSH or a USB disk) them to your computer. If you have followed along with the other OpenVPN tutorials in this series, you will have a copy of the client certificate, key, and the CA certificate on your system. Shimo is more expensive than the others, but not by much: it is only €14.95 (about $21USD). Finally, my client of choice is Shimo, which is not just an OpenVPN client (like the other two), but also works with a number of other VPN and VPN-like solutions: Cisco VPN, IPSec, PPTP/L2TP, SSH, and so forth. It has a cost of $9USD with a 30 day trial. One popular OpenVPN client for OS X is Tunnelblick. There are a few possible clients to choose from. Here, I look at setting up OpenVPN as a client on OS X. In other tips I’ve covered how to set up an OpenVPN Linux server and an OpenVPN Linux client. Vincent Danen takes you through the process of setting up an OS X client on OpenVPN using Shimo, which will also provide you with a reliable, robust connection via iPhone tethering.
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