man knockd Command

Man page for apt-get knockd Command

Man Page for knockd in Linux

This tutorial shows the man page for man knockd in linux.

Open terminal with 'su' access and type the command as shown below:
man knockd

Result of the Command Execution shown below:

knockd(1)                                                                                                                                                  knockd(1)



NAME
       knockd   port knock server

SYNOPSIS
       knockd [options]

DESCRIPTION
       knockd  is  a  port knock server.  It 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 con Äê
       figuration file.  This can be used to open up holes in a firewall for quick access.

COMMANDLINE OPTIONS
        i,   interface <int>
              Specify an interface to listen on.  The default is eth0.

        d,   daemon
              Become a daemon.  This is usually desired for normal server like operation.

        c,   config <file>
              Specify an alternate location for the config file.  Default is /etc/knockd.conf.

        D,   debug
              Ouput debugging messages.

        l,   lookup
              Lookup DNS names for log entries. This may be a security risk! See section SECURITY NOTES.

        v,   verbose
              Output verbose status messages.

        V,   version
              Display the version.

        h,   help
              Syntax help.

CONFIGURATION
       knockd reads all knock/event sets from a configuration file.  Each knock/event begins with a title marker, in the form [name], where name is the name of  the
       event that will appear in the log.  A special marker, [options], is used to define global options.


       Example 

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