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8 Νοε 2022 · Network Time Protocol (NTP) is a protocol that helps the computers clock times to be synchronized in a network. This protocol is an application protocol that is responsible for the synchronization of hosts on a TCP/IP network. NTP was developed by David Mills in 1981 at the University of Delaware.
5 Αυγ 2009 · Over a long period of time with many samples, NTP can actually determine if the computer's clock is slow or fast, and automatically adjust it accordingly, allowing it to keep reasonably good time even if it is later disconnected from the network.
This document describes NTP version 4 (NTPv4), which is backwards compatible with NTP version 3 (NTPv3), described in RFC 1305, as well as previous versions of the protocol. NTPv4 includes a modified protocol header to accommodate the Internet Protocol version 6 address family.
Network Time Protocol (NTP) is a networking protocol devised to synchronize the clocks of computers over a data network. Originally developed by David L. Mills in 1985, NTP operates over the User Datagram Protocol (UDP) and aims for high accuracy and fault-tolerant timekeeping.
NTP uses IP/UDP on destination port 123 to exchange NTP timestamps and accurately calculate the current time within microseconds. Generally, it is a request-response message exchange, as shown in the following high-level diagram.
27 Ιουν 2022 · A typical example would be a GPS (Global Positioning System) receiver that gets the time from satellites. These satellites in turn have a cesium clock that is periodically corrected to provide maximum accuracy. Less expensive (and accurate) reference clocks use one of the terrestrial broadcasts known as DCF77, MSF, and WWV.
24 Ιαν 2019 · The standard UDP destination port for NTP is 123, while the source port *might* be 123 as well. Have a look at the current NTPv4 RFC 5905 “Network Time Protocol Version 4: Protocol and Algorithms Specification” in order to understand the packets and protocol details.
