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Home of the Network Time Protocol - http://www.ntp.org/
NTP official reference implementation (for Unix and Unix-like OSes, with ports to Microsoft Windows NT, VMS, real-time OSes like VxWorks and QNX). Also jumping-off point to the official NTP documentation and FAQ, community documentation tools (twiki), pool.ntp.org, and related projects. |
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pool.ntp.org: The Internet Time Network - http://www.pool.ntp.org/
Information on a collection of public NTP servers provided by users and ISP's placed in a DNS round-robin under pool.ntp.org. |
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NTP Servers Web - http://support.ntp.org/bin/view/Servers/WebHome
Community maintained list of public Stratum 1 and Stratum 2 NTP time servers, including policies and requirements for use, contact information. Maintained via the NTP TWiki, by the admins of the respective sites themselves. |
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NTP Support Web - http://support.ntp.org/bin/view/Support/WebHome
Not the official NTP documentation or the official NTP FAQ. 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. |
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RFC1305 - Network Time Protocol (Version 3) - http://tools.ietf.org/html/rfc1305
The current NTP standard. Available here in HTML, PDF, and Postscript formats. |
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RFC2030 - Simple Network Time Protocol Version 4 - http://tools.ietf.org/html/rfc2030
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. |
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The NTP FAQ and HOWTO - http://www.ntp.org/ntpfaq/NTP-a-faq.htm
Understanding and using the Network Time Protocol (A first try on a non-technical Mini-HOWTO and FAQ on NTP) |
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O'Reilly Cisco Cookbook - http://safari.oreilly.com/0596003676
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. |
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Flawed Routers Flood University of Wisconsin Internet Time Server - http://pages.cs.wisc.edu/~plonka/netgear-sntp/
Report by Dave Plonka on the massive problems caused on the University of Wisconsin network and time servers, due to misconfiguration of NetGear equipment |
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Vendor: Sun Blueprints Online: Using NTP to Control and Synchronize System Clocks - Part I: Introduction to NTP - http://www.sun.com/blueprints/0701/NTP.pdf
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. |