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Implementation of IPsec for GNU/Linux

Openswan is an implementation of IPsec for the Linux operating system. Is it a code fork of the FreeS/WAN project which has been terminated. It provides IPSEC (IP Security, which is both encryption and authentication) kernel extensions and an IKE (Internet Key Exchange, keying and encrypted routing daemon), as well as various rc scripts and documentation. Openswan is known to interoperate with other IPSEC and IKE systems already deployed by other vendors. It features Opportunistic Encryption, subnet extrusion, X.509 certificates, NAT Traversal support, XAUTH, and DNSSEC support.

"IRC Help" IRC Help channel

"IRC development" IRC development channel


version 2.6.49 (stable)
released on 8 August 2016

Paid technical support available from Xelerance, Inc. at

VCS Checkout login


Related Projects



Verified by

Verified on


Verified by

Janet Casey

Verified on

22 March 2004

Leaders and contributors

The Openswan project Maintainer

Resources and communication

AudienceResource typeURI
DeveloperVCS Repository Webview
Debian (Ref)

Software prerequisites

Required to useLinux kernel 2.4.x or later
Required to useLibgmp

This entry (in part or in whole) was last reviewed on 22 February 2018.


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