knock(1)
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
