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 Port Knocking

Learn more about Port Knocking with a FAQ and an old article from Linux Journal.

"... users make connection attempts to sequences of closed ports. The failed connections are logged by the server-side packet filtering firewall and detected by a dæmon that monitors the firewall log file. When a properly formatted knock sequence, playing the role of the secret used in the authentication, is received, firewall rules are manipulated based on the information content of the sequence."

 (Submitted by Noel Fri Feb 27, 2004 )


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