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Free S WAN

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Free S/WAN
GNU/Linux FreeS/WAN is an implementation of IPSEC (Internet Protocal SECurity) and IKE for GNU/Linux systems. It uses strong cryptography to provide both authentication and encryption; authentication ensures that packets are from the right sender and have not been altered in transit, and encryption prevents unauthorised reading of packet contents. These services allow you to build secure tunnels through untrusted networks. Everything passing through the untrusted net is encrypted by the IPSEC gateway machine and decrypted by the gateway at the other end. The result is Virtual Private Network or VPN. This network is effectively private even though it includes machines at several different sites connected by the insecure Internet. Several companies are co-operating in the Secure Wide Area Network (S/WAN) project to ensure that products will interoperate. There is also a VPN Consortium fostering cooperation among companies in this varea. The primary objective is to help make IPSEC widespread by providing source code which is freely available, runs on a range of machines including ubiquitous cheap PCs, and is not subject to US or other nations' export restrictions.


User manual available in HTML format from


Download version 2.04 (stable)
released on 25 November 2003


Related Projects


LicenseVerified byVerified onNotes
GPLv2Janet Casey26 January 2001

Leaders and contributors

Rob Hatfield Contributor
Steve Reid Contributor
Eric Young Contributor
John S. Denker Contributor
Marc Boucher. Contributor
Peter Onion Contributor

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Help,Support E-mail

Software prerequisites

This entry (in part or in whole) was last reviewed on 28 December 2007.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

The copyright and license notices on this page only apply to the text on this page. Any software or copyright-licenses or other similar notices described in this text has its own copyright notice and license, which can usually be found in the distribution or license text itself.

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