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Man Pages


Manual Reference Pages  -  KNOCK (1)

NAME

knock - port-knock client

CONTENTS

Synopsis
Description
Options
Examples
See Also
Author

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.
-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.
-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>

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knockd 0.5 KNOCK (1) June 26, 2005

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