Libreswan

Libreswan: Open Source IPsec & IKE for Linux

Libreswan is an open source implementation of IPsec and IKE for Linux, providing VPN tunnels and encryption to secure network traffic over untrusted networks.

What is Libreswan?

Libreswan is a free software implementation of the most widely supported and standarized VPN protocol (IPsec & IKEv2). It runs on Linux operating systems and securely encrypts network traffic over untrusted networks like the public Internet.

Some key features of Libreswan include:

• Fully open source and free to use under the GNU GPL license
• Implements Internet Key Exchange (IKEv1 and IKEv2), which handles authentication and establishes encryption keys
• Supports Encapsulating Security Payload (ESP) to encrypt IP packets sent over VPN tunnels
• Includes NAT-Traversal support for connections across NAT firewalls/gateways
• Highly interoperable and compatible with many IPsec clients and gateways
• Modular architecture that can be customized for specific needs
• Runs as a Linux service in kernel space for efficiency

Libreswan is commonly used to set up VPN tunnels between Linux servers, offering a secure way to connect remote networks. It can create site-to-site VPNs as well as client-based VPNs for remote access. The open source nature of Libreswan allows organizations to audit the code for security and modify it if needed.

Libreswan Features

Official Links