Silent, multi-layer security for your organization.
Port knocking: a stealthy system for network authentication across closed ports
Port Knocking has not been seen on TV


Perl prototype: v0.30

  • pcaplib support added; daemon no longer requires firewall log file

2004-Nov-14 18:59 | ...more

new Net::Pcap support added to sniff packets directly ...more

Links to related and background articles, guides, standards, documents, sites and books.

The Requests for Comments (RFC) document series is a set of technical and organizational notes about the Internet (originally the ARPANET), beginning in 1969. Memos in the RFC series discuss many aspects of computer networking, including protocols, procedures, programs, and concepts, as well as meeting notes, opinions, and sometimes humor. (from

The list below is a small subset of RFC documents (get the entire set here) that may be useful in the context of port knocking.





last updated 2005-Jan-03 15:18
Port Knocking (c) 2002-2019 Martin Krzywinski