Thanks maikcat.
I have installed OpenVPN using below tutorial.
https://www.digitalocean.com/community/tutorials/how-to-setup-and-configure-an-openvpn-server-on-centos-6
Installation went successfully.
But when i start OpenVPN service on server.
My '/etc/openvpn/openvpn.log' displayed error:
Thu Nov 20 18:07:41 2014 us=220624 TCP/UDP: Closing socket
Thu Nov 20 18:07:41 2014 us=220706 /sbin/ip route del 10.8.0.0/24
RTNETLINK answers: Operation not permitted
Thu Nov 20 18:07:41 2014 us=223692 ERROR: Linux route delete command failed: external program exited with error status: 2
Thu Nov 20 18:07:41 2014 us=223730 Closing TUN/TAP interface
Thu Nov 20 18:07:41 2014 us=223751 /sbin/ip addr del dev tun0 local 10.8.0.1 peer 10.8.0.2
RTNETLINK answers: Operation not permitted
Thu Nov 20 18:07:41 2014 us=226826 Linux ip addr del failed: external program exited with error status: 2
Please help.