OpenVPN is an easy-to-use, robust, highly configurable, cross-platform VPN (Virtual Private Network) daemon which can be used to securely link two or more private networks using an encrypted tunnel over the internet. It can forward a tun(4) interface over a single UDP or TCP port with support for NAT, dynamic endpoints, compression, fragmentation and keep- alive. It uses OpenSSL's encryption, authentication, and certification features, with static keys, certificates or TLS-based key exchange.
WWW: https://openvpn.net/index.php/open-source/
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