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Time Server NTP - ipNTPNetwork Time Protocol (NTP)The Network Time Protocol is a standard rule set for the syncronization of clocks in computer systems via packet communication networks (for example: Ethernet). The Network Time Protocol (NTP) uses the connectionless network protocol UDP for Ethernet. This enables reliable time indication over networks with variable packet transit times. General principlesNTP is one of the oldest Ethernet TCP/ IP protocols in use. It uses the UDP port 123. The current version is V4. It synchronizes the local clock with the help of external time signals transmitted either directly from a local recipient (DCF77 or GPS ) or from an NTP server. NTP uses a hierarchical system of differet strata. While NTP time servers with stratum 1 are connected with a very precise external clock (such as a GPS or DCF77 radio), network time servers with stratum 2 derive their time from one or more systems with stratum 1, etc. SNTPThe Simple Network Time Protocol (SNTP) is a simplified version of the NTP. It is described in RFC4330. SNTP is implemented in the UNIX and Linux operating systems assuming the form of ntpd/xntpd background processes. In the more recent Windows versions as of Windows XP, SNTP is used by the operating system to keep the local computer currently on time. This process is performed in the background with win32time. Due to the fact that Microsoft introduced this procedure rather late, many providers have in the meantime developed independent and usually better programs for time synchronization under Windows.
More informationA detailed documentation can be found under the link: ntp.org Redundant servers for synchronizationUnder Windows operating systems, redundant synchronization can be performed only with the help of NTP time server clients. Public NTP servers:
Time synchronisation with Windows operating systemsyTime synchronisation with Unix/Linux operating systems |
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