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NTP resources

Centralx Time

An accurate time provider, contributes with the NTP Pool Project.

David and Cecilia Taylor

Several well-documented projects involving implementing and testing NTP.

Flawed Routers Flood University of Wisconsin Internet Time Server

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

Galleon Systems

Galleon Systems provides time synchronisation hardware and software solutions.

Google Groups: comp.protocols.time.ntp

Discussion group on NTP. May require a Google login.

Home of the Network Time Protocol

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.

Network Time Foundation

The network time foundation develops, produces and maintains the most widely used open source time synchronisation software.

Network Time Protocol at the University of Michigan

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

Network Time Synchronization Project

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.

The NTP FAQ and HOWTO

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

NTP Pool Project

A big virtual cluster of timeservers providing reliable easy to use NTP service for millions of clients.

NTP Servers Web

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.

NTP Support Web

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.

RFC1305 - Network Time Protocol (Version 3)

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

RFC2030 - Simple Network Time Protocol Version 4

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.

Vendor: endruntechnologies.com: Introduction to 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. [PDF]