wok-6.x view knock/description.txt @ rev 24751
cairo-gl: modified lookup-symbol.c for binutils-2.37
| author | Hans-G?nter Theisgen |
|---|---|
| date | Wed Mar 16 17:24:41 2022 +0100 (2022-03-16) |
| parents | |
| children |
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1 Knockd is a port-knock server.
2 It listens to all traffic on an ethernet (or PPP) interface, looking
3 for special "knock" sequences of port-hits.
4 A client makes these port-hits by sending a TCP (or UDP) packet to a
5 port on the server. This port need not be open -- since knockd listens
6 at the link-layer level, it sees all traffic even if it's destined for
7 a closed port.
8 When the server detects a specific sequence of port-hits, it runs a
9 command defined in its configuration file. This can be used to open up
10 holes in a firewall for quick access.