Libreswan is an Internet Key Exchange (IKE) implementation for Linux, FreeBSD, NetBSD and OpenBSD. It supports IKEv1 and IKEv2 and has support for most of the extensions (RFC + IETF drafts) related to IPsec, including IKEv2, X.509 Digital Certificates, NAT Traversal, and many others.
Libreswan was forked from Openswan 2.6.38, which was forked from FreeS/WAN 2.04.
The Libreswan Project
https://libreswan.org/
A Git repository is available at:
https://github.com/libreswan/libreswan/
We need this program to simulate a VPN gateway in the Data Server. OpenSwan does not support Debian linux for Ubuntu, and also does not available at Fedora linux for Amazon Linux. The last version has been released since 2021, github project.