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>