Libreswan is an open-source implementation of the IPsec protocol, designed for creating secure VPN (Virtual Private Network) connections. It provides encryption, authentication, and key exchange to ensure secure communications over untrusted networks, such as the internet.

Features of Libreswan:

• Supports IKEv1 and IKEv2 for secure key exchange and VPN connections.
• Daemonless architecture, providing security and flexibility in management.
• Full compatibility with standard IPsec-based protocols.
• Rootless operation for enhanced security in multi-user environments.
• Integration with systemd for service management and automation.

To check the installed Libreswan version, use:

ipsec --version

Disclaimer: Libreswan is an open-source implementation of the IPsec protocol developed by the Libreswan project and the open-source community. It is provided under the terms of the GNU General Public License (GPL) version 2 and is not affiliated with, endorsed by, or sponsored by any commercial entity. This information is for educational purposes only. Libreswan is provided "as is," without any warranty, express or implied. Users utilize this software at their own risk.