openvpn

Hi, i want to inquire about openvpn. Should i purchase a certificate for server and client?, or it’s free?, and how can i download it?. Some help please.

You can create self signed certificates for free.

Can you explore more mrz please, how can i create self signed certificates? how can i get the certificate files, can i create them from my server?
Thanks

You can create with openssl:
http://wiki.mikrotik.com/wiki/Manual:Create_Certificates

or use easy-rsa tools from openvpn:
http://openvpn.net/index.php/open-source/documentation/howto.html#pki