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