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In computer networking, port knocking is a method of externally opening ports on a firewall by generating a connection attempt on a set of prespecified closed ports. Once a correct sequence of connection attempts is received, the firewall rules are dynamically modified to allow the host which sent the connection attempts to connect over specific port(s).
The firewalls also note the endpoints in order to allow responses from the server to pass back through. The server then sends each client's endpoint and session information to the other client, or peer. Each client tries to connect to its peer through the specified IP address and port that the peer's firewall has opened for the server.
Slashdot "Port Knocking" For Added Security; A Windows implementation of port knocking: KnockKnock; A simple implementation of port knocking. and I will add this one: List of resources about PK and SPA (papers, implementations, presentations...) Luis Martin. PS: Please keep in mind that the link I intend to add is from my own website.
In computer networking, a port or port number is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system , a port is a logical construct that identifies a specific process or a type of network service .
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netcat (often abbreviated to nc) is a computer networking utility for reading from and writing to network connections using TCP or UDP.The command is designed to be a dependable back-end that can be used directly or easily driven by other programs and scripts.
In a recent interview, the astronaut said that the sound was like "someone knocking the body of the spaceship just as knocking an iron bucket with a wooden hammer." See fascinating photos of ...
These funny knock knock jokes are perfect for kids, teens, adults and anyone else looking for a laugh. Find hilarious knee-slappers for the whole family. 150 knock-knock jokes that are a real hoot