1knock(1)                                                              knock(1)
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NAME

6       knock - port-knock client
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SYNOPSIS

9       knock [options] <host> <port[:proto]> [port[:proto]] ...
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DESCRIPTION

12       knock  is a port-knock client.  It sends TCP/UDP packets to each speciā€
13       fied port on host, creating a special knock sequence on  the  listening
14       server (see the knockd manpage for more info on this).
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OPTIONS

17       -u, --udp
18              Make  all  port hits use UDP (default is TCP).  If you want each
19              port to use a different protocol (TCP  or  UDP),  then  you  can
20              specify  the  protocol  on  a  per-port  basis.  See the example
21              below.
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23       -d <t>, --delay <t>
24              Wait <t> milliseconds between each port hit.  This can  be  used
25              in situations where a router mistakes your stream of SYN packets
26              as a port scan and blocks them.  If the packet  rate  is  slowed
27              with --delay, then the router should let the packets through.
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29       -v, --verbose
30              Output verbose status messages.
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32       -V, --version
33              Display the version.
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35       -h, --help
36              Syntax help.
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EXAMPLES

39       knock myserver.example.com 123:tcp 456:udp 789:tcp
40       knock -u myserver.example.com 8284 4721 18592 42912
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SEE ALSO

43       knockd is the accompanying port-knock server.
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AUTHOR

46       Judd Vinet <jvinet@zeroflux.org>
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50knockd 0.7.8                     June 26, 2005                        knock(1)
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