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knockd(1)							       knockd(1)

NAME
     knock - port-knock client

SYNOPSIS
     knock [options] <host> <port[:proto]> [port[:proto]] ...

DESCRIPTION
     knock  is	a port-knock client.  It sends TCP/UDP packets to each specified
     port on host, creating a special knock sequence  on  the  listening  server
     (see the knockd manpage for more info on this).

OPTIONS
     -u, --udp
	    Make  all port hits use UDP (default is TCP).  If you want each port
	    to use a different protocol (TCP or UDP), then you can  specify  the
	    protocol on a per-port basis.  See the example below.

     -d <t>, --delay <t>
	    Wait  <t>  milliseconds  between each port hit.  This can be used in
	    situations where a router mistakes your stream of SYN packets  as  a
	    port  scan and blocks them.  If the packet rate is slowed with --de-
	    lay, then the router should let the packets through.

     -4, --ipv4 <version>
	    Force usage of IPv4.

     -6, --ipv6 <version>
	    Force usage of IPv6.

     -v, --verbose
	    Output verbose status messages.

     -V, --version
	    Display the version.

     -h, --help
	    Syntax help.

EXAMPLES
     knock myserver.example.com 123:tcp 456:udp 789:tcp
     knock -u myserver.example.com 8284 4721 18592 42912

SEE ALSO
     knockd is the accompanying port-knock server.

AUTHOR
     Judd Vinet <jvinet@zeroflux.org>

knockd 0.8			 April 22, 2021 		       knockd(1)

Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=knock&sektion=1&manpath=FreeBSD+Ports+15.1.quarterly>

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