Editing OpenVPN (section)

== Client Configuration ==

=== Required Files ===

Under Windows, the following files will need to be placed in ''Program Files\OpenVPN\Config''

==== ca.crt ====

This is the Root CA certificate that the client and server certificates are signed with. It is required for all clients.

==== ta.key ====

This is a preshared secret used for the ''tls-auth'' directive. It is required for all clients.

==== client.crt & client.key ====

These two files are specific to each individual client. Everyone requiring access to the VPN will need these files generated for them.

These files are generated on '''inferno.incoherency.net'', as root:

 cd /root/easy-rsa
 . ./vars
 ./build-key clientname

Where ''clientname'' is the unique name of the client you are building the certificate/key files for. When prompted for the CN (Common Name) attribute, use the same ''clientname'' parameter used on the command line.

==== incoherency.ovpn ====

This is the main configuration file. Under Unix systems you'd likely call this incoherency.conf or client.conf. The ''ovpn'' extension to this filename is Windows specific.

Change the cert and key directives in this file to match your certificate and key files respectively.

<pre>
client
dev tun
proto udp
remote inferno.incoherency.net 1194
resolv-retry infinite
nobind
persist-key
persist-tun
ca ca.crt
cert yourcert.crt
key yourkey.key

ns-cert-type server
tls-auth ta.key 1
cipher AES-128-CBC
comp-lzo
</pre>

=== Mac OS X ===

OS X has an OpenVPN GUI called [[http://code.google.com/p/tunnelblick/ Tunnelblick]]. The setup is basically the same as in Windows. The client configuration, certificates, etc go in ''~/Library/openvpn''.

Unfortunately Tunnelblick does not seem to support the ''redirect-gateway'' directive as of version 3.0b9.

=== Vista Quirks ===

* The TAP driver included with OpenVPN in versions prior to 2.1 is not compatible with Vista. At the time of this writing ''OpenVPN 2.1_rc13'' is available and appears to work as expected. Although I'm not sure the TAP driver is required for our purposes, given the TAP interface is used for bridged VPNs, not routed VPNs.

* UAC prevents the OpenVPN client from adding or altering routes in the system. When launching the OpenVPN GUI under Vista, write click the shortcut and choose ''Run as Administrator'' to work around this.