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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.

 Name                                                      Last modified      Size  
 Parent Directory                                                               -   
 README                                                    30-Aug-2016 14:42  596   
 doinst.sh                                                 30-Aug-2016 14:42  873   
 knock-0.5.tar.gz                                          30-Aug-2016 14:42   82K  
 knock.SlackBuild                                          26-Nov-2013 10:57  2.1K  
 knock.info                                                30-Aug-2016 14:42  276   
 rc.knockd.new                                             30-Aug-2016 14:42  577   
 slack-desc                                                30-Aug-2016 14:42  1.0K  

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