A bit of googling turned up a great post by on howtoforge.com called, “OpenVPN Server On CentOS 5.2“. I didn’t know quite how to add the rpmforge repo that is needed to install OpenVPN from so … google turned up another handy article how to do that called, “CentOS 5 – install rpmforge yum repo“. I checked the rpmforge RPM releases at http://dag.wieers.com/rpm/packages/rpmforge-release/ to be sure that this is the latest release … it is (as of June 2009). The following pasties are based off of the aforementioned article with some changes.

yum install openvpn
cd /etc/openvpn/
mkdir easy-rsa
cp -R /usr/share/doc/openvpn-2.0.9/easy-rsa/2.0/* easy-rsa/
chmod -R 777 easy-rsa/
cd easy-rsa/
. ./vars
./clean-all
./build-ca
–> For the common name use “OpenVPN-CA”, of anything else helpfully descriptive. <–
./build-key-server server
–> Enter various customized values if you so please, but be sure to leave the common name value as the default – “server”. Oh, and answer yes to the two questions at the end. <–
./build-key client1
–> Change the number 1 to 2, 3, and so on how ever many client certificates you want. Leave the common name as the default “clientn“. <–
./build-dh
cd keys/
openvpn --genkey --secret ta.key

For more information on transferring the necessary keys to the client, see the final part of a blog post I did on running OpenVPN on Debian.

I created two example config files utilizing the OpenVPN routed tunnel method … hope they help. [server] [client]

Just add the static routes to the VPN subnet(s) to your LAN gateway.

If you need any help I suppose you could always pay me to set this up for you, that’s what I’ve done for some other folks.