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Wiki | O | Openvpn


OpenVPN is an open source virtual private network(VPN) product available under the General Public License (GNU). It offers a simplified security framework, cross-platform connections to and a scalable modular network design. OpenVPN is also available under private license for those entities that wish to redistribute it in a modified customized form.


OpenVPN allows its users to

1. Encrypt, validate and certify each other and protect their private network traffic while in transit on the internet.
2. Connect to any IP subnetwork or a virtual ethernet adapter over a single TCP (transmission control port) or UDP (user datagram protocol).
3. Use cipher, key size or HMAC (hash message authentication code) digest to check the datagram integrity using the OpenSSL Library.
4. Configure and customize a modular load-balanced VPN server framework using one or more servers that have the capacity to handle numerous dynamic connections from incoming traffic.
5. Control the open network using a GUI on Windows or Mac OS X.
6. Tunneling options for networks to create point-to-point or user-to-user connections
7. Create a connection over NAT (Network Address Translation).
8. The tunnel across secure ethernet bridges using virtual tap devices.
9. OpenVPN offers security provisions against both active and passive attacks.
10. It is compatible with all the major operating systems including Linux, Solaris, OpenBSD, FreeBSD, NetBSD, MacOS X, Windows operating systems.

OpenVPN was written by James Yonan in the year 2001 and has over 5 million users. It is available under two versions – Open VPN Community Edition that is free and open source and OpenVPN Access Server that offers community edition with additional features. 

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