On CentOS 5 via RPM
You need to install LZO (http://www.oberhumer.com/opensource/lzo/) compression library on your server before you can install OpenVPN.
Once these are installed, you are ready to install OpenVPN. The following steps will download and install OpenVPN:cd /tmp
wget http://dag.wieers.com/rpm/packages/lzo2 ... f.i386.rpm
wget http://dag.wieers.com/rpm/packages/lzo2 ... f.i386.rpm
rpm -Uvh lzo2*.rpm
Once this command runs, OpenVPN has successfully been installed on your system.cd /tmp
wget http://dag.wieers.com/rpm/packages/open ... f.i386.rpm
rpm -Uvh openvpn-2.0.9-1.el5.rf.i386.rpm