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NTP.PL9.NETNTP FinderRFC2030RFC 2030 (RFC2030)Internet RFC/STD/FYI/BCP Archives[ RFC Index | RFC Search | Usenet FAQs | Web FAQs | Documents | Cities ] Alternate Formats: rfc2030.txt | rfc2030.txt.pdfRFC 2030 - Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI--------------------------------------------------------------------------------Network Working Group D. MillsRequest for Comments: 2030 University of DelawareObsoletes: 1769 October 1996Category: InformationalSimple Network Time Protocol (SNTP) Version 4for IPv4, IPv6 and OSIStatus of this MemoThis memo provides information for the Internet community. This memodoes not specify an Internet standard of any kind. Distribution ofthis memo is unlimited.AbstractThis memorandum describes the Simple Network Time Protocol (SNTP)Version 4, which is an adaptation of the Network Time Protocol (NTP)used to synchronize computer clocks in the Internet. SNTP can be usedwhen the ultimate performance of the full NTP implementationdescribed in RFC-1305 is not needed or justified. When operating withcurrent and previous NTP and SNTP versions, SNTP Version 4 involvesno changes to the NTP specification or known implementations, butrather a clarification of certain design features of NTP which allowoperation in a simple, stateless remote-procedure call (RPC) modewith accuracy and reliability expectations similar to the UDP/TIMEprotocol described in RFC-868.The only significant protocol change in SNTP Version 4 over previousversions of NTP and SNTP is a modified header interpretation toaccommodate Internet Protocol Version 6 (IPv6) [DEE96] and OSI[COL94] addressing. However, SNTP Version 4 includes certain optionalextensions to the basic Version 3 model, including an anycast modeand an authentication scheme designed specifically for multicast andanycast modes. While the anycast mode extension is described in thisdocument, the authentication scheme extension will be described inanother document to be published later. Until such time that adefinitive specification is published, these extensions should beconsidered provisional.This memorandum obsoletes RFC-1769, which describes SNTP Version 3.Its purpose is to correct certain inconsistencies in the previousdocument and to clarify header formats and protocol operations forcurrent NTP Version 3 (IPv4) and proposed NTP Version 4 (IPv6 andOSI), which are also used for SNTP. A working knowledge of the NTPVersion 3 specification RFC-1305 is not required for animplementation of SNTP.1. IntroductionThe Network Time Protocol (NTP) Version 3 specified in RFC-1305[MIL92] is widely used to synchronize computer clocks in the globalInternet. It provides comprehensive mechanisms to access nationaltime and frequency dissemination services, organize the time-synchronization subnet and adjust the local clock in eachparticipating subnet peer. In most places
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