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• openvpn

プロジェクトの歴史

OpenVPN was created by James Yonan and traces its public history to 2001. The project chose a custom VPN protocol using SSL/TLS for key exchange and OpenSSL for cryptography rather than implementing IPsec, PPTP, or L2TP.

OpenVPN 1.x was mainly a point-to-point tool. OpenVPN 2.0 was the major architectural step: the official how-to and manual describe scalable multi-client TCP/UDP server mode, where many clients connect to a single server process and share one TUN or TAP interface.

The 2.x line added features that made OpenVPN practical in mixed networks: certificate-based TLS deployments, username/password authentication hooks, pushed routes and DNS options, management interfaces, plugins and scripts, IPv6 support, Windows service improvements, and continued crypto and platform updates.

採用の歴史

OpenVPN spread through Unix and Linux distributions, router firmware, VPN providers, and enterprise remote-access setups because it used ordinary TCP or UDP ports, worked through many NAT and firewall environments, and could be configured with plain text profile files. Package availability across Linux, BSD, macOS, Windows package managers, and router-oriented ecosystems made .ovpn profiles a portable operational artifact.

OpenVPN Inc. built commercial products such as Access Server and OpenVPN Connect around the open source Community Edition while continuing to support the community project. That split gave the protocol a dual life: a free daemon for administrators and a managed product line for organizations.

使われ方

Operators use OpenVPN to build routed layer-3 VPNs with TUN devices, bridged layer-2 VPNs with TAP devices, site-to-site tunnels, road-warrior remote access, lab networks, router-based VPN clients, and compatibility endpoints for commercial VPN services. A typical deployment combines server and client configuration files, certificates or username/password credentials, route pushes, firewall rules, and system services.

Package users care about the single openvpn executable because it is both the client and the server. That keeps scripting, service supervision, and container use straightforward, while configuration complexity lives in profile files and PKI assets.

パッケージ好きにとっての重要性

OpenVPN is one of the canonical networking packages where packaging is operations: binaries, services, sample configs, plugin paths, systemd or launchd integration, certificate locations, and kernel TUN/TAP support all affect whether the package is usable.

Its long history also makes it a compatibility anchor. Even as WireGuard changed expectations for small VPN codebases, OpenVPN remains important for existing .ovpn profiles, mature server deployments, commercial-provider compatibility, and environments that need TLS-style transport flexibility.

タイムライン

• 2001: James Yonan releases the first OpenVPN versions.
• 2005: OpenVPN 2.0 establishes multi-client server mode as the core scalable deployment pattern.
• 2013-era 2.3 line: OpenVPN documentation notes complete IPv6 and PolarSSL support among 2.3 improvements.
• 2017-era 2.4 line: the project adds modern client/server negotiation features and continues improving Windows service behavior.
• 2020s: OpenVPN Community Edition continues through the 2.5, 2.6, and 2.7 lines while OpenVPN Inc. maintains commercial Access Server and OpenVPN Connect products around the protocol.

Related projects

• OpenVPN is related to OpenVPN Access Server, OpenVPN Connect, EasyRSA, Tunnelblick, NetworkManager-openvpn, OpenWrt and other router firmware integrations, SoftEther VPN's OpenVPN protocol support, WireGuard, IPsec, and TLS libraries such as OpenSSL and mbed TLS.

ソース

• https://blog.openvpn.net/the-history-of-openvpn/
• https://community.openvpn.net/
• https://github.com/OpenVPN/openvpn
• https://openvpn.net/access-server-or-community/
• https://openvpn.net/community-docs/community-articles/openvpn-2-6-manual.html
• https://openvpn.net/community-docs/how-to.html
• https://openvpn.net/community/