- 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
 http://www.cs.wisc.edu/~plonka/netgear-sntp/
- Geodsoft.com: Beginner's Guide to Network Time Protocol
A tutorial on installing NTP servers on UNIX (OpenBSD and Linux) and Windows to accurately synchronize computer times.
http://geodsoft.com/howto/timesync/
- LinuxDevCenter.com: Synchronizing Networks with NTP [Jan. 02, 2003]
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.
http://www.linuxdevcenter.com/pub/a/linux/2003/01/02/ntp.html
- NTP Statistics Gathering & 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
http://www.david-taylor.myby.co.uk/ntp/NTPandMRTG.txt
- RFC1305 - Network Time Protocol (Version 3)
The current NTP standard. Available here in HTML, PDF, and Postscript formats.
http://www.faqs.org/rfcs/rfc1305.html
- 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.
http://www.faqs.org/rfcs/rfc2030.html
- Site Local Guide: bnl.gov: Network Time Protocol Version 3
Aimed primarily at helping internal BNL users with NTP, this page provides useful setup information for various flavors of Unix.
http://www.ccd.bnl.gov/xntp/
- Site Local Guide: umich.edu: Network Time Protocol at the University of Michigan
A discussion of why and how to set up NTP software.
http://www.umich.edu/~rsug/services/ntp.html
- 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.
http://www.sun.com/blueprints/0603/817-2979.pdf
- Vendor: Sun Blueprints Online: Using NTP to Control and Synchronize System Clocks - Part I: Introduction to NTP
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.
http://www.sun.com/blueprints/0701/NTP.pdf
- Vendor: Sun Blueprints Online: Using NTP to Control and Synchronize System Clocks - Part II: Basic NTP Administration and Architecture
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.
http://www.sun.com/blueprints/0801/NTPpt2.pdf
- Vendor: Sun Blueprints Online: Using NTP to Control and Synchronize System Clocks - Part III: NTP Monitoring and Troubleshooting
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.
http://www.sun.com/blueprints/0901/NTPpt3.pdf
- 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.
http://www.endruntechnologies.com/pdf/NTP-Intro.pdf
- Vendor: meinberg.de: NTP - The Network Time Protocol
NTP information page with a lot of details about supported platforms, naming conventions, configuration with or without radio clock and about checking the NTP Status. This company is a vendor of NTP time server hardware and related equipment.
http://www.meinberg.de/english/info/ntp.htm
- Vendor: sco.com: Configuring Network Time Protocol (NTP) service
A detailed information page about the guidelines for implementing NTP on Caldera (SCO) Linux
http://docsrv.sco.com/NET_tcpip/CTOC-ntpN.ntp.html
- Vendor: suse.com: Time Synchronization Through the Network
This page helps with configuration of NTP software in the S.u.S.E. Linux distribution.
http://portal.suse.com/sdb/en/2002/02/xntp.html
- ietf.org: Secure Network Time Protocol (stime) Charter
Information and drafts from the IETF Working Group pursuing authenticated distribution of time information.
http://www.ietf.org/html.charters/stime-charter.html
- ntp.org: 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.
http://twiki.ntp.org/bin/view/Support/WebHome
- ntp.org: NTP Reference Implementation Official Mailing Lists
Variety of mailing lists used to support the NTP Reference Implementation, including the announce list, CVS logs, bugs, and questions (which is gatewayed to the USENET newsgroup comp.protocols.time.ntp).
http://mailman.ntp.org/mailman/listinfo
- ntp.org: Network Time Protocol Official Reference Implementation
Home for the NTP official reference implementation (for Unix, with a port to Microsoft Windows NT). Also jumping-off point to the official NTP documentation and FAQ, community documentation tools (twiki), pool.ntp.org, and related projects
http://www.ntp.org/
- ntp.org: Network Time Protocol Reference Implementation Official FAQ
Understanding and using the Network Time Protocol (A first try on a non-technical Mini-HOWTO and FAQ on NTP)
http://www.ntp.org/ntpfaq/NTP-a-faq.htm
- ntp.org: Public DNS round-robin Time project
A collection of public NTP servers provided by users and ISP's placed in a DNS round-robin under pool.ntp.org.
http://www.pool.ntp.org/
- ntp.org: Public NTP Time Servers
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.
http://twiki.ntp.org/bin/view/Servers/WebHome
- oreilly.com: Cisco Cookbook - Chapter 14 - NTP and Time
The Cisco Cookbook gathers hundreds of example router configurations all in one place. In this chapter 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.
http://safari.oreilly.com/?x=1&mode=toc&sortKey=title&sortOrder=asc&view=&xmlid=0-596-00367-6&g=&catid=&s=1&b=1&f=1&t=1&c=1&u=1&r=&o=1&n=1&d=1&p=1&srchText=#
- oreilly.com: Hardening Cisco Routers - Chapter 10 - NTP
Sample chapter from the book, showing the cisco-specific methods of configuring your routers to support using NTP time synchronization.
http://www.oreilly.com/catalog/hardcisco/chapter/ch10.html
- udel.edu: 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.
http://www.eecis.udel.edu/~mills/ntp.html
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