Libreswan is an open-source VPN solution that implements the IPsec and IKE (Internet Key Exchange) protocols to establish secure, encrypted connections over the internet. It is widely used for creating site-to-site and remote access VPNs, providing privacy and security for data communication between networks or devices. Libreswan is highly configurable and supports a variety of deployment scenarios, including cloud and enterprise environments.

Features of Libreswan:

Establishes secure, encrypted tunnels for site-to-site and remote access VPNs using IPsec and IKEv2 protocols.
Supports NAT traversal to enable VPN connections through NAT (Network Address Translation) devices.
Flexible configuration options for robust, enterprise-grade VPN deployments.
Open-source software with strong community support and continuous development.
Supports various authentication methods, including pre-shared keys (PSK) and certificates.

To check libreswan version:

$ sudo su

$ /usr/local/sbin/ipsec --version

Disclaimer: Libreswan is open-source software released under the GPLv2 license. It is not affiliated with, endorsed by, or sponsored by any other company. Libreswan is provided "as is," without any warranty, express or implied. Users utilize this software at their own risk. The developers and contributors to Libreswan hold no responsibility for any damages, losses, or consequences resulting from the use of this software. Users are advised to carefully review and comply with licensing terms and any applicable regulations while using Libreswan.

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Libreswan
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