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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).
A port knock setup needs a firewall that logs every port access, a daemon which has means to change the firewall rules (!), and, depending on how complex the knock sequences should be, cryptographic hash generators, handling of multiple knock attempts coming in at the same time, etc.
Luong's father, Luong Xuan Duong (d. 1997), [2] was a Major (Thiếu tá) in the Republic of Vietnam Marine Division. On 29 April 1975 he and his family were evacuated from Tan Son Nhat International Airport during Operation Frequent Wind, landing on the deck of the aircraft carrier USS Hancock.
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
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.
Chữ khoa đẩu is a term claimed by the Vietnamese pseudohistorian Đỗ Văn Xuyền to be an ancient, pre-Sinitic script for the Vietnamese language. Đỗ Văn Xuyền's works supposedly shows the script have been in use during the Hồng Bàng period, and it is believed to have disappeared later during the Chinese domination of Vietnam .
Bình Xuyên Force (Vietnamese: Bộ đội Bình Xuyên, IPA: [ɓɨ̂n swiəŋ]), often linked to its infamous leader, General Lê Văn Viễn (nicknamed "Bảy Viễn"), was an independent military force within the Vietnamese National Army whose leaders once had lived outside the law and had sided with the Việt Minh.
Port, exhaust or transfer orifice of a two-stroke engine; Bass reflex, also known as a reflex port or ported system, a system to increase loudspeaker efficiency; Computer port (hardware), a physical interface between a computer and other electronic devices; I/O port, a location in port address space associated with peripheral device