man knock (Commandes) - port-knock client
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>