UDP: Typically, OpenVPN uses UDP as its transport protocol. I couldn't find any historical information about this protocol. It's second job is to multiplex the SSL/TLS session used for authentication and key exchange with the actual encrypted tunnel data stream. This protocol provides the SSL/TLS connection with a reliable transport layer (as it is designed to operate over). TLS - Use SSL/TLS + certificates for authentication and key exchangeįor TLS authentication OpenVPN uses a custom security protocol which is described here on this WIKI page.Static Key - Use a pre-shared static key.It uses all of the encryption, authentication, and certification features of the OpenSSL library to protect your private network traffic as it transits the internet. With OpenVPN, you can tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port.
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