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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, it runs a command defined in its configuration file. This can be used to open up holes in a firewall for quick access.
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6 lines
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@comment $NetBSD: PLIST,v 1.1.1.1 2010/11/30 12:35:12 adam Exp $
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bin/knock
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man/man1/knock.1
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man/man1/knockd.1
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sbin/knockd
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share/examples/knock/knockd.conf
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