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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.
24 Ιαν 2019 · ;) Following is a downloadable pcap in which I am showing the most common NTP packets such as basic client-server messages, as well as control and authenticated packets. I am also showing how to analyze the delta time with Wireshark, that is: how long an NTP server needs to respond to a request.
This document describes the Network Time Protocol Version 4 (NTPv4), which is widely used to synchronize the time for Internet hosts, routers and ancillary devices to Coordinated Universal Time (UTC) as disseminated by national standards laboratories. It describes the core architecture, protocol, state machine, data structures and algorithms.
The NTP format allows convenient multiple-precision arithmetic and conversion to UDP/TIME message (seconds), but does complicate the conversion to ICMP Timestamp message (milliseconds) and Unix time values (seconds and microseconds or seconds and nanoseconds).
There are three NTP time formats, a 128-bit date format, a 64-bit timestamp format, and a 32-bit short format, as shown in Figure 3. The 128-bit date format is used where sufficient storage and word size are available.
This document describes the Network Time Protocol (NTP), specifies its formal structure and summarizes information useful for its implementation. NTP provides the mechanisms to synchro-nize time and coordinate time distribution in a large, diverse internet operating at rates f rom mundane to lightwave.
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.