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Status:

PROPOSED STANDARD

Obsoletes:

RFC 1305,RFC 4330

Updated by:

RFC 7822,RFC 8573,RFC 9109,RFC 9748,RFC 9769

Authors:

D. Mills
J. Martin, Ed.
J. Burbank
W. Kasch

Stream:

IETF

Source:

ntp (int)

Cite this RFC:TXT  | XML  |  BibTeX

DOI:  https://doi.org/10.17487/RFC5905

Discuss this RFC: Send questions or comments to the mailing listntp@ietf.org

Other actions:View Errata  | Submit Errata  | Find IPR Disclosures from the IETF  | View History of RFC 5905

Abstract

The Network Time Protocol (NTP) is widely used to synchronizecomputer clocks in the Internet. This document describes NTP version4 (NTPv4), which is backwards compatible with NTP version 3 (NTPv3),described in RFC 1305, as well as previous versions of the protocol.NTPv4 includes a modified protocol header to accommodate the InternetProtocol version 6 address family. NTPv4 includes fundamentalimprovements in the mitigation and discipline algorithms that extendthe potential accuracy to the tens of microseconds with modernworkstations and fast LANs. It includes a dynamic server discoveryscheme, so that in many cases, specific server configuration is notrequired. It corrects certain errors in the NTPv3 design andimplementation and includes an optional extension mechanism.

For the definition ofStatus,seeRFC 2026.

For the definition ofStream, seeRFC 8729.