OpenVPN is extremely popular and a full-featured SSL VPN (Virtual Private Network) software. It implements OSI layer 2 or 3 secure network extension using the SSL/TLS protocol. Like much other popular software, it is open-source, free software and distributed under the GNU GPL. This tutorial provides step-by-step instructions for configuring an OpenVPN “road warrior” server on Ubuntu Linux 20.04 LTS including ufw firewall configuration to secure traffic over public Wi-Fi or 5G/4G/LTE traffic.
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