OpenVPN is an application to securely tunnel IP networks over a single UDP or TCP port. It can be used to access remote sites, make secure point-to-point connections, enhance wireless security, etc. . OpenVPN uses all of the encryption, authentication, and certification features provided by the OpenSSL library (any cipher, key size, or HMAC digest). . OpenVPN may use static, pre-shared keys or TLS-based dynamic key exchange. It also supports VPNs with dynamic endpoints (DHCP or dial-up clients), tunnels over NAT or connection-oriented stateful firewalls (such as Linux's iptables).
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