OpenVPN is a full-featured virtual private network (VPN) solution which can accommodate a wide range of configurations, including remote access, site-to-site VPNs, WiFi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls.
OpenVPN implements OSI layer 2 or 3 secure network extension using the industry standard SSL/TLS protocol, supports flexible client authentication methods based on certificates, smart cards, and/or 2-factor authentication, and allows user or group-specific access control policies using firewall rules applied to the VPN virtual interface.
OpenVPN is not a web application proxy and does not operate through a web browser.
Features include:
- Tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port.
- Configure a scalable, load-balanced VPN server farm using one or more machines which can handle thousands of dynamic connections from incoming VPN clients.
- Use all of the encryption, authentication, and certification features of the OpenSSL library to protect your private network traffic as it transits the internet.
- Use any cipher, key size, or HMAC digest (for datagram integrity checking) supported by the OpenSSL library.
- Choose between static-key based conventional encryption or certificate-based public key encryption.
- Use static, pre-shared keys or TLS-based dynamic key exchange.
- Use real-time adaptive link compression and traffic-shaping to manage link bandwidth utilization.
- Tunnel networks whose public endpoints are dynamic such as DHCP or dial-in clients.
- Tunnel networks through connection-oriented stateful firewalls without having to use explicit firewall rules.
- Tunnel networks over NAT.
- Create secure ethernet bridges using virtual tap devices.
- Graphical User Interface.
Website: openvpn.net
Support: HOWTO
Developer: James Yonan
License: GNU General Public License v2.0
OpenVPN is written in C. Learn C with our recommended free books and free tutorials.
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