Hello. Thank you very much for your help. I don't know much about networking. I just configured the openvpn server and its ip address is 10.100.0.1 and netmask is 255.255.255.255. My client is 10.100.0.6 and netmask is 255.255.255.252. My client cannot ping 10.100.0.1. I just need to know if this is the default configuration of openvpn. What i want to do is to setup the apache server after the openvpn server and check if my client can access that server through the openvpn server. waiting for your reply.