pkgsrc - [no description]

Age	Commit message (Collapse)	Author	Files	Lines
2010-11-30	knockd is a port-knock server. It listens to all traffic on an ethernet (or PPP)	adam	1	-0/+7
	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.