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'fwknop' implements an authorization scheme that requires only a single encrypted packet to communicate various pieces of information, including desired access through a Netfilter policy and/or specific commands to execute on the target system. Its main use is to protect services such as SSH with an additional layer of security, which makies exploitation of vulnerabilities much more difficult. The authorization server works by passively monitoring authorization packets via libpcap.


User manpage available in HTML format from


Download version 0.9.2 (stable)
released on 8 August 2005


Related Projects


LicenseVerified byVerified onNotes
GPLv2Janet Casey29 July 2005

Leaders and contributors

See the CREDITS file in the distribution for a complete list Contributor
Michael Rash Maintainer

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail
Developer VCS Repository Webview

Software prerequisites

This entry (in part or in whole) was last reviewed on 7 January 2008.


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