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.

       -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>