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
Geodsoft How-To: NTP Time Synchronization
A tutorial on installing NTP servers on UNIX (OpenBSD and Linux) and Windows to accurately synchronize computer times.
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.
LinuxDevCenter.com: Synchronizing Networks with NTP
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.
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 Protocol Version 3
Aimed primarily at helping internal BNL.gov users with NTP, this page provides useful setup information for various flavors of Unix.
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.
NTP Community Documentation
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.
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 Reference Implementation Mailing Lists
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).
NTP Statistics Gathering and Reporting with MRTG
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
O'Reilly Cisco Cookbook
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.
O'Reilly Hardening Cisco Routers
Sample chapter from the book, showing the cisco-specific methods of configuring your routers to support using NTP time synchronization.
pool.ntp.org: The Internet Time Network
Information on a collection of public NTP servers provided by users and ISP's placed in a DNS round-robin under pool.ntp.org.
Public NTP Time Server List
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.
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]
Vendor: sco.com: Configuring Network Time Protocol (NTP) service
A detailed information page about the guidelines for implementing NTP on Caldera (SCO) Linux
Vendor: Sun Blueprints Online: Using NTP on the Sun Fire 15K/12K Server
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. [PDF]
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