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10 lines
596 B
Text
10 lines
596 B
Text
Knockd and knock are a port-knock server and client, respectively. Knockd
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listens to all traffic on an ethernet (or PPP) interface, looking for
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special "knock" sequences of port-hits. A client makes these port-hits
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by sending a TCP (or UDP) packet to a port on the server. This port
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need not be open -- since knockd listens at the link-layer level, it
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sees all traffic even if it's destined for a closed port. When the
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server detects a specific sequence of port-hits, it runs a command
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defined in its configuration file. This can be used to open up holes in
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a firewall for quick access.
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