RFC 1119 Network Time Protocol (Version 2) Specification and Implementation
RFC 1059 Network Time Protocol (Version 1) Specification and Implementation
RFC 5905 Network Time Protocol Version 4: Protocol and Algorithms Specification. On many systems, you can say "udp port ntp" rather than "udp port 123". However, you can filter on the well known NTP UDP port 123.Ĭapture only the NTP based traffic: udp port 123 You cannot directly filter NTP protocols while capturing. Show only the NTP based traffic: ntp Capture Filter SampleCaptures/NTP_with_MD5_key_foobar.pcap (MD5 encryption key: "foobar")Ī complete list of NTP display filter fields can be found in the display filter reference There are no NTP related preference settings. XXX - Add example traffic here (as plain text or Wireshark screenshot). The well known UDP port for NTP traffic is 123. UDP: Typically, NTP uses UDP as its transport protocol. The Wikipedia article has a relevant writeup of the protocol. A lot of intricate details are involved, which are described in the relevant research project pages History Adjusting the clock is not instantaneously, but smoothed over time towards the reference time sources selected. The NTP client asks the NTP server about the current time, and then will adjust it's internal clock to that value. 
The NTP server will (hopefully) have the precise time (probably directly from an atomic clock).
NTP is used to synchronize the clock of a network client with a server.
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