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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).
Door knocker, item of door furniture that allows people outside to alert those inside; Knocker-up, profession in England and Ireland before alarm clocks were affordable or reliable; Port knocker, to externally open ports on a firewall; Sanctuary Knocker, ornamental knocker on the door of a cathedral
Pork-knockers are freelance Guyanese prospectors who mine for diamonds and gold in the alluvial plains of the Guyanese interior. Pork-knockers have been responsible for discovering large deposits of gold and diamonds. The name "pork-knockers" refers to their regular diet of pickled pork of wild pig that is often eaten at the end of the day. [1]
Download QR code; Print/export Download as PDF; Printable version; In other projects Wikidata item; ... Port(s) of Call may refer to: Port of call (nautical term) ...
Knocking (2021 film), a Swedish thriller film "Knockin'" (song), by Spanish band Double Vision (1995) Engine knocking, or the sound accompanying automotive combustion malfunction; Port knocking, a covert method of opening a port on a server; Roof knocking, a bombing practice of the Israeli Defense Forces; Gene knockin, genetic engineering method
In computer networks, download means to receive data from a remote system, typically a server [1] such as a web server, an FTP server, an email server, or other similar systems. This contrasts with uploading, where data is sent to a remote server. A download is a file offered for downloading or that has been downloaded, or the process of ...
When an outbound connection from a private endpoint passes through a firewall, it receives a public endpoint (public IP address and port number), and the firewall translates traffic between them. Until the connection is closed, the client and server communicate through the public endpoint, and the firewall directs traffic appropriately.
Against some port knocking designs, DoS attacks are a major problem, but against othes, they are impratical or would require massive resources to be effective. Again, see this for descriptions of port knocking designs. DoS attacks are a weakness of certain specific designs, not a systemic flaw in the port knocking concept.