The basis of the OpenVPN tunnel is the openvpn program, which runs on a UDP port (standard 5000) on the server as well as on the client side and creates a virtual network interface with the help of the Tun/Tap driver, which represents one end of the tunnel in each case. IPsec ESP protocol for secure tunnel transport over UDP.SSL/TLS and X509 PKI (Public Key Infrastructure) for session authentication.BSD, OS X and Windows, as well as iOS and Android) Supports a wide range of operating systems (e.g.: Linux, Solaris, div.Advantages of OpenVPNĬommunication via OpenVPN offers numerous advantages: However, the configuration should not differ at all for other systems. Since Linux in most cases is used as server OS and Windows on the client side machines, this article discovers the configuration of a VPN server under Linux, as well as the setup of the client accesses within Windows systems.

The software is OpenSource and available for Linux, OpenBSD, Microsoft Windows and MAC OS X. The program is both server and client application. OpenVPN offers a great possibility to establish an encrypted VPN connection. Managing large scale VPNs easily with OpenVPN and PERL.OpenVPN is licensed under the GNU GPL (General Public License). The transport protocol can be either UDP or TCP, and OpenVPN currently offers the pre-shared key method or certificates as authentication methods. OpenVPN is a free software for setting up a Virtual Private Network (VPN) over encrypted TLS/SSL connections.

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