Report by Dave Plonka on the massive problems caused on the University of Wisconsin network and time servers, due to misconfiguration of NetGear equipment

A tutorial on installing NTP servers on UNIX (OpenBSD and Linux) and Windows to accurately synchronize computer times.

NTP official reference implementation (for Unix and Unix-like OSes, with ports to Microsoft Windows NT, VMS, real-time OSes like VxWorks and QNX, etc...). Also jumping-off point to the official NTP documentation and FAQ, community documentation tools (twiki), pool.ntp.org, and related projects

Accurate timekeeping is vital to accurate records, and accurate logs are the mainstay of good system administration. Glenn Graham explains NTP (the Network Time Protocol) and how to put it to work on your network.

A discussion of why and how to set up NTP software. Some information is specific to the Unversity, some is more general.

Aimed primarily at helping internal BNL.gov users with NTP, this page provides useful setup information for various flavors of Unix.

NTP Project page for Dr. Mills, primary NTP researcher for over twenty years. He and his students are working on NTP version 4 to improve robustness and security.

Even though this is hosted at ntp.org, this is not the official NTP documentation or the official NTP FAQ. This is intended to be the collection point for cookbook configurations, tips, hints, tricks, and other comments from directly from various members of the NTP community that might be beneficial to others within the community. Anyone who is interested in helping to develop or improve documentation for NTP is encouraged to join and contribute.

Variety of mailing lists used to support ntp.org, including the announce list, CVS logs, bugs, and questions (which is gatewayed to the USENET newsgroup comp.protocols.time.ntp).

David Taylor's short description of how he uses MRTG (and SNMP) to gather and report statistics for NTP for his servers, including Perl scripts, shell scripts, and mrtg.conf examples

This book gathers hundreds of example router configurations all in one place. In chapter 14, the authors provide information on configuring, running, and debugging NTP on your Cisco router. This link via O'Reilly's Safari network for online publications.

Sample chapter from the book, showing the cisco-specific methods of configuring your routers to support using NTP time synchronization.

Information on a collection of public NTP servers provided by users and ISP's placed in a DNS round-robin under pool.ntp.org.

Community maintained list of Stratum 1 and Stratum 2 NTP time servers, including policies and requirements for use, contact info, etc.... Maintained via the NTP TWiki, by the admins of the respective sites themselves.

The current NTP standard. Available here in HTML, PDF, and Postscript formats.

The current standard for SNTP, a version of the protocol for implementations which do not need all of the features of NTP. Available here in HTML, PDF, and Postscript formats.

Information and drafts from the IETF Working Group pursuing authenticated distribution of time information.

Understanding and using the Network Time Protocol (A first try on a non-technical Mini-HOWTO and FAQ on NTP)

Four page document that gives a very simple high-level overview of how NTP works and some of the issues to be considered when looking to set up NTP time servers. This company is a vendor of NTP time servers and related hardware.

A detailed information page about the guidelines for implementing NTP on Caldera (SCO) Linux

This article addresses the time skew issues for the Sun Fire 12K/F15K server and explains how the system controllers and domains can be configured as NTP clients to external servers. A sample configuration is also provided. This article is targeted to the intermediate level of expertise.

This article is the first of a series on the Network Time Protocol (NTP). NTP allows synchronizing clocks on different network nodes, which is critical in today's networked world. This first article provides an overview of why time synchronization is important and introduces basic NTP concepts.

This is Part 2 of a three-article series that discusses how to use Network Time Protocol (NTP) to synchronize system clocks. This article explains the basics of client and server administration, covering various client/server configurations, as well as authentication and access control mechanisms. This article also provides a number of suggestions for an effective NTP architecture.

This article is the third in a series of three articles that discuss using Network Time Protocol (NTP) to synchronize system clocks. The goal of this article is to provide an effective understanding of NTP troubleshooting and monitoring.

This page helps with configuration of NTP software in the S.u.S.E. Linux distribution.