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knockd: A port-knocking server
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- Zusammenfassung (meist engl.)
- It listens to all traffic on an ethernet (or PPP) interface, looking
for special "knock" sequences of port-hits. A client (package knock)
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.
Authors:
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Judd Vinet <jvinet@zeroflux.org>
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Umfang: | 30 KiB |