This script is for Slackware 13.37 only and may be outdated.

SlackBuilds Repository

13.37 > Network > knock (0.5)

Knockd and knock are a port-knock server and client, respectively. Knockd 
listens to all traffic on an ethernet (or PPP) interface, looking for
special "knock" sequences of port-hits. A client makes these port-hits
by sending a TCP (or UDP) packet to a port on the server. This port
need not be open -- since knockd listens at the link-layer level, it
sees all traffic even if it's destined for a closed port. When the
server detects a specific sequence of port-hits, it runs a command
defined in its configuration file. This can be used to open up holes in
a firewall for quick access.

Maintained by: Joey Trungale
Keywords: port knock,knocking,firewall
ChangeLog: knock


Source Downloads:
knock-0.5.tar.gz (ca09d61458974cff90a700aba6120891)

Download SlackBuild:
knock.tar.gz.asc (FAQ)

(the SlackBuild does not include the source)

Individual Files:

Validated for Slackware 13.37

See our HOWTO for instructions on how to use the contents of this repository.

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