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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	speci-
       fied 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 be-
	      low.

       -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 --delay, 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+14.3.quarterly>

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