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Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI (RFC2030)

IP.com Disclosure Number: IPCOM000002584D
Original Publication Date: 1996-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 15 page(s) / 46K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Mills: AUTHOR

Abstract

This 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 used when the ultimate performance of the full NTP implementation described in RFC-1305 is not needed or justified. When operating with current and previous NTP and SNTP versions, SNTP Version 4 involves no changes to the NTP specification or known implementations, but rather a clarification of certain design features of NTP which allow operation in a simple, stateless remote-procedure call (RPC) mode with accuracy and reliability expectations similar to the UDP/TIME protocol described in RFC-868.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 6% of the total text.

Network Working Group D. Mills

Request for Comments: 2030 University of Delaware

Obsoletes: 1769 October 1996

Category: Informational

Simple Network Time Protocol (SNTP) Version 4

for IPv4, IPv6 and OSI

Status of this Memo

This memo provides information for the Internet community. This memo

does not specify an Internet standard of any kind. Distribution of

this memo is unlimited.

Abstract

This 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 used

when the ultimate performance of the full NTP implementation

described in RFC-1305 is not needed or justified. When operating with

current and previous NTP and SNTP versions, SNTP Version 4 involves

no changes to the NTP specification or known implementations, but

rather a clarification of certain design features of NTP which allow

operation in a simple, stateless remote-procedure call (RPC) mode

with accuracy and reliability expectations similar to the UDP/TIME

protocol described in RFC-868.

The only significant protocol change in SNTP Version 4 over previous

versions of NTP and SNTP is a modified header interpretation to

accommodate Internet Protocol Version 6 (IPv6) [DEE96] and OSI

[COL94] addressing. However, SNTP Version 4 includes certain optional

extensions to the basic Version 3 model, including an anycast mode

and an authentication scheme designed specifically for multicast and

anycast modes. While the anycast mode extension is described in this

document, the authentication scheme extension will be described in

another document to be published later. Until such time that a

definitive specification is published, these extensions should be

considered provisional.

This memorandum obsoletes RFC-1769, which describes SNTP Version 3.

Its purpose is to correct certain inconsistencies in the previous

document and to clarify header formats and protocol operations for

current NTP Version 3 (IPv4) and proposed NTP Version 4 (IPv6 and

OSI), which are also used for SNTP. A working knowledge of the NTP

Version 3 specification RFC-1305 is not required for an

implementation of SNTP.

1. Introduction

The Network Time Protocol (NTP) Version 3 specified in RFC-1305

[MIL92] is widely used to synchronize computer clocks in the global

Internet. It provides comprehensive mechanisms to access national

time and frequency dissemination services, organize the time-

synchronization subnet and adjust the local clock in each

participating subnet peer. In most places of the Internet of today,

NTP provides accuracies of 1-50 ms, depending on the characteristics

of the synchronization source and network paths.

RFC-1305 specifies the NTP Version 3 protocol machine in ...