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knockd is a port-knock server. It listens to all traffic on an ethernet
(or PPP) interface, looking for special "knock" sequences of port-hits.
A client makes these port-hits by sending a TCP (or UDP) packet to a
port on the server. This port need not be open -- since knockd listens
at the link-layer level, it sees all traffic even if it's destined for
a closed port. When the server detects a specific sequence of port-hits
port-hits, it runs a command defined in its configuration file. This
can be used to open up holes in a firewall for quick access.
WWW: http://www.zeroflux.org/projects/knock
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