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diff --git a/contrib/ntp/html/index.htm b/contrib/ntp/html/index.htm deleted file mode 100644 index 680cec8..0000000 --- a/contrib/ntp/html/index.htm +++ /dev/null @@ -1,261 +0,0 @@ -<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"> -<html> -<head> -<meta name="generator" content="HTML Tidy, see www.w3.org"> -<title>The Network Time Protocol (NTP) Distribution</title> -</head> -<body> -<h3>The Network Time Protocol (NTP) Distribution</h3> - -<img align="left" src="pic/barnstable.gif" alt="gif"><a href= -"http://www.eecis.udel.edu/~mills/pictures.htm"><i>P.T. Bridgeport -Bear</i>; from <i>Pogo</i>, Walt Kelly</a> - -<p>Pleased to meet you.<br clear="left"> -</p> - -<hr> -<h4>Introduction</h4> - -Note: The software contained in this distribution is available -without charge under the conditions set forth in the <a href= -"copyright.htm">Copyright Notice</a>. - -<p>The Network Time Protocol (NTP) is used to synchronize the time -of a computer client or server to another server or reference time -source, such as a radio or satellite receiver or modem. It provides -accuracies typically within a millisecond on LANs and up to a few -tens of milliseconds on WANs relative to Coordinated Universal Time -(UTC) via a Global Positioning Service (GPS) receiver, for example. -Typical NTP configurations utilize multiple redundant servers and -diverse network paths in order to achieve high accuracy and -reliability. Some configurations include cryptographic -authentication to prevent accidental or malicious protocol attacks -and some provide automatic server discovery using IP multicast.</p> - -<p>Background information on computer network time synchronization -can be found on the <a href="exec.htm">Executive Summary - Computer -Network Time Synchronization</a> page. Discussion on protocol -conformance issues and interoperability with previous NTP versions -can be found in the <a href="biblio.htm">Protocol Conformance -Statement</a> page. Discussion on how NTP reckons the time can be -found in the <a href="leap.htm">NTP Timescale and Leap Seconds</a> -page. Background information, bibliography and briefing slides -suitable for presentations can be found in the <a href= -"http://www.eecis.udel.edu/~mills/ntp.htm">Network Time -Synchronization Project</a> page. Additional information can be -found at the NTP web site <a href="http://www.ntp.org"> -www.ntp.org</a>. Please send bug reports to <a href= -"mailto:bugs@mail.ntp.org"><bugs@mail.ntp.org></a>.</p> - -<h4>Building and Installing NTP</h4> - -NTP supports Unix and Windows (NT4 and 2000) systems. The <a href= -"build.htm">Building and Installing the Distribution</a> page -presents an overview of the procedures for compiling the -distribution and installing it on a typical client or server. The -build procedures inspect the system hardware and software -environment and automatically select the appropriate options for -that environment. While these procedures work with most computers -and operating systems marketed today, exceptions requiring manual -intervention do exist, as documented in the <a href="config.htm"> -Configuration Options</a> and <a href="release.htm">Release -Notes</a> pages. Note that support for strong cryptography requires -cryptographic libraries not included in this distribution. - -<p>Bringing up a NTP primary server requires a radio or satellite -receiver or modem. It is also possible to configure a machine on an -isolated network with the local clock driver and have other -machines synchronize to it. The distribution includes hardware -drivers for the local clock and over three dozen radio clocks and -modem services. A list of supported drivers is given in the <a -href="refclock.htm">Reference Clock Drivers</a> page. For most -popular workstations marketed by Digital/Compaq, Sun and Hewlett -Packard, as well as widely available Unix clones such as FreeBSD -and Linux, the automatic build procedures select all drivers that -run on the target machine. While this increases the size of the -executable binary somewhat, individual drivers can be included or -excluded using the configure utility documented in the -Configuration Options page.</p> - -<h4>Configuring Clients and Servers</h4> - -<p>NTP is by its very nature a complex distributed network -application and can be configured and used for a great many widely -divergent timekeeping scenarios. The documentation presented on -these pages attempts to cover the entire suite of configuration, -operation and maintenance facilities which this distribution -supports. However, most applications will need only a few of these -facilities. If this is the case, the <a href="quick.htm">Quick -Start</a> page may be useful to get a simple workstation on the air -with an existing server.</p> - -<p>However, in order to participate in the existing NTP -synchronization subnet and obtain accurate, reliable time, it is -usually necessary to construct an appropriate configuration file, -commonly called <tt>ntp.conf</tt>, which establishes the servers -and/or external receivers or modems to be used by this particular -machine. Directions for constructing this file are in the <a href= -"notes.htm">Notes on Configuring NTP and Setting up a NTP -Subnet</a> page. However, in many common cases involving simple -network topologies and workstations, the configuration data can be -specified entirely on the command line for the <a href="ntpd.htm"> -<tt>ntpd</tt> - Network Time Protocol (NTP) daemon</a>.</p> - -<p>The most important factor in providing accurate, reliable time -is the selection of modes and servers to be used in the -configuration file. A discussion on the available modes is on the -<a href="assoc.htm">Association Management</a> page. NTP support -for one or more computers is normally engineered as part of the -existing NTP synchronization subnet. The existing NTP subnet -consists of a multiply redundant hierarchy of servers and clients, -with each level in the hierarchy identified by stratum number. -Primary servers operate at stratum one and provide synchronization -to secondary servers operating at stratum two and so on to higher -strata. In this hierarchy, clients are simply servers that have no -dependents.</p> - -<p>The NTP subnet in late 2000 includes over a hundred public -primary (stratum 1) servers synchronized directly to UTC by radio, -satellite or modem and located in every continent of the globe, -including Antarctica. Normally, client workstations and servers -with a relatively small number of clients do not synchronize to -primary servers. There are over a hundred public secondary (stratum -2) servers synchronized to the primary servers and providing -synchronization to a total in excess of 100,000 clients and servers -in the Internet. The current lists are maintained in the <a href= -"http://www.eecis.udel.edu/~mills/ntp/index.htm">Information on -Time and Frequency Services</a> page, which is updated frequently. -There are numerous private primary and secondary servers not -normally available to the public as well. You are strongly -discouraged from using these servers, since they sometimes hide in -little ghettos behind dinky links to the outside world and your -traffic can bring up expensive ISDN lines, causing much grief and -frustration.</p> - -<h4>Resolving Problems</h4> - -Like other things Internet, the NTP synchronization subnets tend to -be large and devilishly intricate, with many opportunities for -misconfiguration and network problems. The NTP engineering model is -specifically designed to help isolate and repair such problems -using an integrated management protocol, together with a suite of -monitoring and debugging tools. There is an optional data recording -facility which can be used to record normal and aberrant operation, -log problems to the system log facility, and retain records of -client access. The <a href="debug.htm">NTP Debugging Techniques</a> -and <a href="hints.htm">Hints and Kinks</a> pages contain useful -information for identifying problems and devising solutions. - -<p>Users are requested to report bugs, offer suggestions and -contribute additions to this distribution. The <a href= -"patches.htm">Patching Procedures</a> page suggests procedures -which greatly simplify distribution updates, while the <a href= -"porting.htm">Porting Hints</a> page suggest ways to make porting -this code to new hardware and operating systems easier. Additional -information on reference clock driver construction and debugging -can be found in the <a href="refclock.htm">Reference Clock -Drivers</a> page. Further information on NTP in the Internet can be -found in the <a href="http://www.eecis.udel.edu/~ntp">NTP web -page</a>.</p> - -<h4>Program Manual Pages</h4> - -<ul> -<li><a href="ntpd.htm"><tt>ntpd</tt> - Network Time Protocol (NTP) -daemon</a></li> - -<li><a href="ntpq.htm"><tt>ntpq</tt> - standard NTP query -program</a></li> - -<li><a href="ntpdc.htm"><tt>ntpdc</tt> - special NTP query -program</a></li> - -<li><a href="ntpdate.htm"><tt>ntpdate</tt> - set the date and time -via NTP</a></li> - -<li><a href="ntptrace.htm"><tt>ntptrace</tt> - trace a chain of NTP -servers back to the primary source</a></li> - -<li><a href="tickadj.htm"><tt>tickadj</tt> - set time-related -kernel variables</a></li> - -<li><a href="ntptime.htm"><tt>ntptime</tt> - read kernel time -variables</a></li> - -<li><a href="genkeys.htm"><tt>ntp-genkeys</tt> - generate public -and private keys</a></li> -</ul> - -<h4>Supporting Documentation</h4> - -<ul> -<li><a href="http://www.eecis.udel.edu/~mills/ntp.htm">NTP Project -and Reference Library</a></li> - -<li><a href="copyright.htm">Copyright Notice</a></li> - -<li><a href="exec.htm">Executive Summary - Computer Network Time -Synchronization</a></li> - -<li><a href="biblio.htm">Protocol Conformance Statement</a></li> - -<li><a href="leap.htm">NTP Timescale and Leap Seconds</a></li> - -<li><a href="notes.htm">Notes on Configuring NTP and Setting up a -NTP Subnet</a></li> - -<li><a href="release.htm">NTP Version 4 Release Notes</a></li> - -<li><a href="build.htm">Building and Installing the -Distribution</a></li> - -<li><a href="config.htm">Configuration Options</a></li> - -<li><a href="debug.htm">NTP Debugging Techniques</a></li> - -<li><a href="refclock.htm">Reference Clock Drivers</a></li> - -<li><a href="patches.htm">Patching Procedures</a></li> - -<li><a href="hints.htm">Hints and Kinks</a></li> - -<li><a href="porting.htm">Porting Hints</a></li> -</ul> - -<h4>Application Notes</h4> - -<ul> -<li><a href="prefer.htm">Mitigation Rules and the <tt>prefer</tt> -Keyword</a></li> - -<li><a href="assoc.htm">Association Management</a></li> - -<li><a href="pps.htm">Pulse-per-second (PPS) Signal -Interfacing</a></li> - -<li><a href="gadget.htm">Gadget Box PPS Level Converter and CHU -Modem</a></li> - -<li><a href="measure.htm">Time and Time Interval Measurement with -Application to Computer and Network Performance Evaluation</a></li> - -<li><a href="kern.htm">Kernel Model for Precision -Timekeeping</a></li> - -<li><a href="kernpps.htm">Kernel Programming Interface for -Precision Time Signals</a></li> -</ul> - -<hr> -<center><img src="pic/pogo1a.gif" alt="gif"></center> - -<br> -<a href="index.htm"><img align="left" src="pic/home.gif" alt= -"gif"></a> - -<address><a href="mailto:mills@udel.edu">David L. Mills -<mills@udel.edu></a></address> -</body> -</html> - |
