19c2daa00SOllivier Robert<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 29c2daa00SOllivier Robert<html> 39c2daa00SOllivier Robert<head> 4ea906c41SOllivier Robert<meta http-equiv="content-type" content="text/html;charset=iso-8859-1"> 59c2daa00SOllivier Robert<meta name="generator" content="HTML Tidy, see www.w3.org"> 69c2daa00SOllivier Robert<title>The Network Time Protocol (NTP) Distribution</title> 79c2daa00SOllivier Robert<link href="scripts/style.css" type="text/css" rel="stylesheet"> 89c2daa00SOllivier Robert</head> 99c2daa00SOllivier Robert<body> 109c2daa00SOllivier Robert<h3>The Network Time Protocol (NTP) Distribution</h3> 119c2daa00SOllivier Robert<img src="pic/barnstable.gif" alt="gif" align="left"><a href="http://www.eecis.udel.edu/%7emills/pictures.html"><i>P.T. Bridgeport Bear</i>; from <i>Pogo</i>, Walt Kelly</a> 129c2daa00SOllivier Robert<p>Pleased to meet you.</p> 13*2b15cb3dSCy Schubert<p>Last update: 14*2b15cb3dSCy Schubert <!-- #BeginDate format:En2m -->31-Mar-2014 05:41<!-- #EndDate --> 15*2b15cb3dSCy Schubert</p> 169c2daa00SOllivier Robert<br clear="left"> 179c2daa00SOllivier Robert<h4>Related Links</h4> 18*2b15cb3dSCy Schubert<ul> 19*2b15cb3dSCy Schubert <li>A list of all links is on the <a href="sitemap.html">Site Map</a> page.</li> 20*2b15cb3dSCy Schubert</ul> 219c2daa00SOllivier Robert<h4>Table of Contents</h4> 229c2daa00SOllivier Robert<ul> 23*2b15cb3dSCy Schubert <li class="inline"><a href="#intro">Introduction</a></li> 24*2b15cb3dSCy Schubert <li class="inline"><a href="#hand">The Handbook</a></li> 25*2b15cb3dSCy Schubert <li class="inline"><a href="#build">Building and Installing NTP</a></li> 26*2b15cb3dSCy Schubert <li class="inline"><a href="#prob">Resolving Problems</a></li> 27*2b15cb3dSCy Schubert <li class="inline"><a href="#info">Further Information</a></li> 289c2daa00SOllivier Robert</ul> 299c2daa00SOllivier Robert<hr> 309c2daa00SOllivier Robert<h4 id="intro">Introduction</h4> 31*2b15cb3dSCy Schubert<p>Note: The NTP Version 4 software contained in this distribution is available without charge under the conditions set forth in the <a href="copyright.html">Copyright Notice</a>.</p> 32*2b15cb3dSCy Schubert<dl> 33*2b15cb3dSCy Schubert <dd>It is very important that readers understand that the NTP document collection began 25 years ago and remains today a work in progress. It has evolved as new features were invented and old features retired. It has been widely copied, cached and morphed to other formats, including man pages, with varying loss of fidelity. However, these HTML pages are the ONLY authoritative and definitive reference. Readers should always use the collection that comes with the distribution they use. A copy of the online collection at <a href="http://www.ntp.org">www.ntp.org</a> is normally included in the most recent snapshot, but might not agree with an earlier snapshot or release version.</dd> 34*2b15cb3dSCy Schubert</dl> 35*2b15cb3dSCy Schubert<p>This distribution is an implementation of RFC-5905 "Network Time Protocol Version 4: Protocol and Algorithms Specification".<br> 36*2b15cb3dSCy Schubert NTP is widely used to synchronize a computer to Internet time servers or other sources, such as a radio or satellite receiver or telephone modem service. It can also be used as a server for dependent clients. It provides accuracies typically less than a millisecond on LANs and up to a few milliseconds on WANs. Typical NTP configurations utilize multiple redundant servers and diverse network paths in order to achieve high accuracy and reliability.</p> 37*2b15cb3dSCy Schubert<p>This distribution includes a simulation framework in which substantially all the runtime NTP operations and most features can be tested and evaluated. This has been very useful in exploring in vitro response to unusual circumstances or over time periods impractical in vivo. Details are on the <a href="ntpdsim.html">Network Time Protocol (NTP) Simulator</a> page.</p> 38*2b15cb3dSCy Schubert<h4 id="hand">The Handbook</h4> 39*2b15cb3dSCy Schubert<p>A good deal of tutorial and directive information is available on the handbook pages. These should be read in conjunction with the command and option information available on the pages listed on the sitemap page.</p> 40*2b15cb3dSCy Schubert<dl> 41*2b15cb3dSCy Schubert <dt><a href="release.html">NTP Version 4 Release Notes</a></dt> 42*2b15cb3dSCy Schubert <dd>Lists recent changes and new features in the current distribution.</dd> 43*2b15cb3dSCy Schubert <dt><a href="assoc.html">Association Management</a></dt> 44*2b15cb3dSCy Schubert <dd>Describes how to configure servers and peers and manage the various options. Includes automatic server discovery schemes.</dd> 45*2b15cb3dSCy Schubert <dt><a href="discover.html">Automatic Server Discovery Schemes</a></dt> 46*2b15cb3dSCy Schubert <dd>Describes automatic server discovery using broadcast, multicast, manycast and server pool scheme.</dd> 47*2b15cb3dSCy Schubert <dt><a href="access.html">Access Control Support</a></dt> 48*2b15cb3dSCy Schubert <dd>Describes the access control mechanisms that can be used to limit client access to various time and management functions.</dd> 49*2b15cb3dSCy Schubert <dt><a href="authentic.html">Authentication Support</a></dt> 50*2b15cb3dSCy Schubert <dd>Describes the authentication mechanisms for symmetric-key and public-key cryptography.</dd> 51*2b15cb3dSCy Schubert <dt><a href="rate.html">Rate Management</a></dt> 52*2b15cb3dSCy Schubert <dd>Describes the principles of rate management to minimize network load and defend against DoS attacks.</dd> 53*2b15cb3dSCy Schubert <dt> </dt> 54*2b15cb3dSCy Schubert <dt><a href="refclock.html">Reference Clock Support</a></dt> 55*2b15cb3dSCy Schubert <dd>Describes the collection of radio clocks used to synchronize primary servers.</dd> 56*2b15cb3dSCy Schubert <dt><a href="warp.html">How NTP Works</a></dt> 57*2b15cb3dSCy Schubert <dd>Gives an overview of the NTP daemon architecture and how it works.</dd> 58*2b15cb3dSCy Schubert</dl> 599c2daa00SOllivier Robert<h4 id="build">Building and Installing NTP</h4> 60*2b15cb3dSCy Schubert<p>NTP supports Unix, VMS and Windows (2000 and later) systems. The <a href="build.html">Building and Installing the Distribution</a> page details the procedures for building and installing on a typical system. This distribution includes drivers for many radio and satellite receivers and telephone modem services in the US, Canada and Europe. A list of supported drivers is on the <a href="refclock.html">Reference Clock Drivers</a> page. The default build includes the debugging options and all drivers that run on the target machine; however, options and drivers can be included or excluded using options on the <a href="config.html">Configuration Options</a> page.</p> 619c2daa00SOllivier Robert<h4 id="prob">Resolving Problems</h4> 62*2b15cb3dSCy Schubert<p>Like other things in modern Internet life, NTP problems can be devilishly intricate. This distribution includes a number of utilities designed to identify and repair problems using an integrated management protocol supported by the <a href="ntpq.html"><tt>ntpq</tt></a> utility program. </p> 63*2b15cb3dSCy Schubert<p>The <a href="debug.html">NTP Debugging Techniques</a> and <a href="hints.html">Hints and Kinks</a> pages contain useful information for identifying problems and devising solutions. Additional information on reference clock driver construction and debugging is in the <a href="rdebug.html">Debugging Hints for Reference Clock Drivers</a> page.</p> 64*2b15cb3dSCy Schubert<p>Users are invited to report bugs and offer suggestions via the <a href="bugs.html">NTP Bug Reporting Procedures</a> page.</p> 65*2b15cb3dSCy Schubert<h4 id="info">Further Information</h4> 66*2b15cb3dSCy Schubert<p>The <a href="sitemap.html">Site Map</a> page contains a list of document collections arranged by topic. The Program Manual Pages collection may be the best place to start. The <a href="comdex.html">Command Index</a> collection contains a list of all configuration file commands together with a short function description. A great wealth of additional information is available via the External Links collection, including a book and numerous background papers and briefing presentations.</p> 67*2b15cb3dSCy Schubert<p>Background information on computer network time synchronization is on the <a href="http://www.eecis.udel.edu/%7emills/exec.html">Executive Summary - Computer Network Time Synchronization</a> page. Discussion on new features and interoperability with previous NTP versions is on the <a href="release.html">NTP Version 4 Release Notes</a> page. Background information, bibliography and briefing slides suitable for presentations are on the <a href="http://www.eecis.udel.edu/%7emills/ntp.html">Network Time Synchronization Research Project</a> page. Additional information is at the NTP web site <a href="http://www.ntp.org">www.ntp.org</a>.</p> 689c2daa00SOllivier Robert<hr> 69*2b15cb3dSCy Schubert<div align="center"> <img src="pic/pogo1a.gif" alt="gif"></div> 709c2daa00SOllivier Robert<br> 719c2daa00SOllivier Robert<script type="text/javascript" language="javascript" src="scripts/footer.txt"></script> 729c2daa00SOllivier Robert</body> 739c2daa00SOllivier Robert</html> 74
