knock - port-knock client

NAME  SYNOPSIS  DESCRIPTION  OPTIONS  EXAMPLES  SEE ALSO  AUTHOR 

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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.

−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.

−4, −−ipv4 <version>

Force usage of IPv4.

−6, −−ipv6 <version>

Force usage of IPv6.

−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 <[email protected]>

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