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Structure of the NTP (Network Time protocol) data packet that is used for time synchronization of network servers and clients, explained.
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.
The NTP packet header consists of an integral number of 32-bit (4 octet) words in network byte order. The packet format consists of three components: the header itself, one or more optional extension fields, and an optional message authentication code (MAC). The header component is identical to the NTPv3 header and previous versions.
In NTP Architecture, Protocol and Algorithms, Prof. Mills summarizes the NTP protocol header and timestamp formats, the NTP packet header format, important dates, timestamp interleaving, the clock filter algorithm, clock select principles, and the clock discipline algorithm.
23 Νοε 2022 · Figure 1 shows two NTP time formats, a 64-bit timestamp format and a 128-bit datestamp format. The datestamp format is used internally, while the timestamp format is used in packet headers exchanged between clients and servers.
Details specific to NTP packet formats commonly used with the User Datagram Protocol (UDP) are presented in Appendix A. Appendix B contains the code skeleton with definitions, structures and code segments that represent the basic structure of
What is Network Time Protocol (NTP)? Mechanisms of NTP; The NTP Packet; How to Configure an NTP Server; Security Aspects of NTP; NTP vs. Other Time-keeping Protocols; Troubleshooting Common NTP Issues; Case Studies; Further Reading and Resources
