What it does
Libreswan is a GPLv2 implementation of IPsec and IKE for building standards-based VPN connections.
Libreswan is infrastructure software for a standards-based IPsec connection. It supports IKE versions 1 and 2 and is commonly obtained through an operating system's package management, with source available from the project. That workflow suits administrators who want the VPN service managed alongside the rest of a host.
The homepage leads with security releases and associated CVEs. Check those notices and your distribution's package status before deployment. The software establishes the tunnel you configure; it does not provide an anonymous account or a ready-made consumer exit location.
Strengths
- Standards-based IPsec and IKE support
- Public security-release notices
Best for
- Linux administrators building IPsec links
Sources
- libreswan (Oct 26, 2026)