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2. Network Time Protocol - Wikipedia

   en.wikipedia.org/wiki/Network_Time_Protocol

   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.

3. ntpd - Wikipedia

   en.wikipedia.org/wiki/Ntpd

   The ntpd program is an operating-system daemon that sets and maintains a computer system's system time in synchronization with Internet-standard time servers.It is a complete implementation of the Network Time Protocol (NTP) version 4, but retains compatibility with versions 1, 2, and 3 as defined by RFC 1059, RFC 1119, and RFC 1305, respectively. ntpd performs most computations in 64-bit ...

4. List of PTP implementations - Wikipedia

   en.wikipedia.org/wiki/List_of_PTP_implementations

   Precision Time Protocol (PTP) is a widely adopted protocol for delivery of precise time over a computer network. A complete PTP system includes PTP functionality in network equipment and hosts. PTP may be implemented in hardware, software or a combination of both. PTP is implemented in end systems and in PTP-aware networking hardware.

5. OpenNTPD - Wikipedia

   en.wikipedia.org/wiki/OpenNTPD

   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.

6. chrony - Wikipedia

   en.wikipedia.org/wiki/Chrony

   Unlike ntpd, it supports synchronizing the system clock via hardware timestamping (i.e. packet times on the network adapter), improving accuracy of time synchronization between machines on a LAN [4] – to the order of 70 nanoseconds (from asymmetry), [12] comparable to Precision Time Protocol. It also supports synchronization by manual input ...

7. Clock synchronization - Wikipedia

   en.wikipedia.org/wiki/Clock_synchronization

   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. Lamport timestamps and vector clocks are concepts of the logical clock in distributed computing.