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The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks. In operation since before 1985, NTP is one of the oldest Internet protocols in current use. NTP was designed by David L. Mills of the University of Delaware.
The NTP pool is a dynamic collection of networked computers that volunteer to provide highly accurate time via the Network Time Protocol to clients worldwide. The machines that are "in the pool" are part of the pool.ntp.org domain as well as of several subdomains divided by geographical zone and are distributed to NTP clients via round-robin DNS.
An existing network server (e.g. a file server) can become a time server with additional software. The NTP homepage provides a free and widely used reference implementation of the NTP server and client for many popular operating systems. The other choice is a dedicated time server device.
It is an alternative to ntpd, a reference implementation of NTP. It runs on Unix-like operating systems (including Linux and macOS) and is released under the GNU GPL v2. [4] It is the default NTP client and server in Red Hat Enterprise Linux 8 and SUSE Linux Enterprise Server 15, [5] [6] and available in many Linux distributions. [7] [8] [9]
In distributed computing, the problem takes on more complexity because a global time is not easily known. The most used clock synchronization solution on the Internet is the Network Time Protocol (NTP) which is a layered client-server architecture based on User Datagram Protocol (UDP) message passing.
chrony – chronyd implements the NTP protocol and can act as either a client or a server. OpenNTPD – A portable Simple NTPD implementation by the OpenBSD group. ntpd-rs – a security-focused implementation of the NTP protocol by Internet Security Research Group .
OpenNTPD (also known as OpenBSD NTP Daemon) is a Unix daemon implementing the Network Time Protocol to synchronize the local clock of a computer system with remote NTP servers. It is also able to act as an NTP server to NTP-compatible clients.
Western Indonesia Time (Waktu Indonesia Barat, WIB) is seven hours ahead of the Coordinated Universal Time (UTC), used in the islands of Sumatra, Java, and the western half of Kalimantan. Central Indonesia Time ( Waktu Indonesia Tengah , WITA) is eight hours ahead ( UTC+08:00 ), used in the eastern half of Kalimantan, as well as all of Bali ...