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Topic: Network Time Protocol

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	RFC 958 (rfc958) - Network Time Protocol (NTP)
		The protocol includes provisions to specify the precision and estimated error of the local clock and the characteristics of the reference clock to which it may be synchronized.
		NTP provides information that can be used to organize this hierarchy on the basis of precision or estimated error and even to serve as a rudimentary routing algorithm to organize the subnetwork itself.
		An outline of a suggested mechanism is as follows: Included in the table of timestamps for each peer are state RFC 958 September Network Time Protocol variables to indicate the precision, as well as the current estimated delay, offset, error and drift rate of its local clock.
	www.faqs.org /rfcs/rfc958.html (3532 words)

	RFC 1305 (rfc1305) - Network Time Protocol (Version 3) Specification, Impl (Site not responding. Last check: 2007-11-07)
		Network Working Group David L. Mills Request for Comments: 1305 University of Delaware Obsoletes RFC-1119, RFC-1059, RFC-958 March 1992 Network Time Protocol (Version 3) Specification, Implementation and Analysis Note: This document consists of an approximate rendering in ASCII of the PostScript document of the same name.
		The protocol includes provisions to specify the characteristics and estimate the error of the local clock and the time server to which it may be synchronized.
		The approach taken in the NTP design and its predecessors involves mutually coupled oscillators and maximum-likelihood estimation and clock-selection procedures, together with a design that allows provable assertions on error bounds to be made relative to stated assumptions on the correctness of the primary reference sources.
	www.faqs.org /rfcs/rfc1305.html (17209 words)

	NETWORK TIME PROTOCOL \| NTP (Site not responding. Last check: 2007-11-07)
		Most system administrators don't consider the importance of accurate network timing, but if your server isn't timed accurately, your log files are of no use in the event of a network security breach or other incident that requires log-dependent information.
		Three years ago, I had several servers timed to a single (note I say single) NTP located at a university that, unbeknownst to me, was checking for the Unix equivalent of the Y2K bug that will occur in the year 2038.
		Network timing has become a critical issue, and several companies have taken the initiative of building hardware based Time Servers.
	www.networkinformation.com /ntp.php (1567 words)

	ntp.org: Home of the Network Time Protocol
		The NTP Public Services Project, which is hosted by Internet Systems Consortium, Inc., provides support and additional development resources for the Official Reference Implementation of NTP.
		NTP is a protocol designed to synchronize the clocks of computers over a network.
		NTP version 4 is a significant revision of the NTP standard, and is the current development version, but has not been formalized in an RFC.
	www.ntp.org (240 words)

	NTP
		NTP has been initiated in the 1980's by Dave L. Mills who was trying to achieve a high accuracy time synchronization for computers across the network.
		In large networks it is a good practice to install one ore more stratum 1 time servers which make a reference time available to several server computers in each department.
		Each time a query was successful a '1' is shifted in from the right, so after the daemon has been started the sequence of reach numbers 0, 1, 3, 7, 17, 37, 77, 177, 377.
	www.meinberg.de /english/info/ntp.htm (3246 words)

	Network Time Protocol (NTP)
		Imagine the confusion that could be created if an email appeared to arrive before being sent, or if an important file, modified in offices in different countries, had a version with a time-stamp indicating it had been created two hours later than its updated version.
		The Network Time Protocol (NTP) is an Internet Standard Recommended Protocol for communicating the Coordinated Universal Time (UTC) from special servers called time servers and synchronising computer clocks on an IP network.
		If you wish to synchronise a network of machines, set up a couple of your machines to refer to AAPT's time servers thereby creating your own stratum three or four network time server and then set up your other machines to refer to your own time servers.
	info.connect.com.au /docs/ntp (853 words)

	Network Time Protocol Version 3 (Site not responding. Last check: 2007-11-07)
		When setting up your ntp configuration file, it is important to reference these machines by their clockserver aliases and not their canonical names; this will allow us to transparently move the NTP servers to other machines in the future.
		Here is a sample NTP configuration file for a setting up a stratum 3 server in the BNL environment.
		If your machine is a client of file server running NTP for a local workgroup, or you have access to another stratum 3 server that is known to be reliable, then you should designate this machine as your time server.
	www.ccd.bnl.gov /xntp (1764 words)

	(NTP) Network Time Protocol
		Simply put, NTP is the protocol used to synchronize the clocks of computers on a network or across multiple networks, like the Internet.
		Symmetricom's NTP products are found in telecom networks; defense, space, and avionics systems; and IT networks in enterprises and other organizations.
		Network security can be compromised when network administrators can't track the activities of hackers because time stamps on log files are not accurate.
	www.ntp-systems.com /ntp.html (419 words)

	LinuxDevCenter.com -- Synchronizing Networks with NTP
		NTP v.4 implements asymmetric encryption, to prevent malicious users from spoofing time packets over port 123.
		The lesson learned was that most NTP clients have the ability to query multiple stratums, writing the average of difference to the software clock.
		In any case, it sounds like a good idea to check how close the NTP server(s) you want to rely on are (via traceroute, or 'ntpq -c peers' after ntpd has been running for a while).
	www.linuxdevcenter.com /pub/a/linux/2003/01/02/ntp.html (2403 words)

	GeodSoft How-To: NTP Time Synchronization: Contents
		The open source Network Time Protocol server, ntpd, is complex, and the extensive and highly technical documentation at the official University of Delaware NTP site, is not oriented to the practical issues of getting NTP servers to work with a minumum of time and effort.
		Installing Network Time Protocol software is trivial compared to figuring out what you're going to connect it to; these pages explain the relationships between NTP servers and how to select public servers to act as your time sources.
		Installing NTP on Unix gives step by step instructions for installing ntpd, the open source and free Network Time Protocol server, on UNIX, specifically OpenBSD 2.6, 2.7, 2.8 and 2.9 and also Red Hat Linux 6.2 and 7.1.
	geodsoft.com /howto/timesync (583 words)

	The Network Time Protocol (NTP) Distribution
		The Network Time Protocol (NTP) is used to synchronize the time of a computer client or server to another server or reference time source, such as a radio or satellite receiver or modem.
		While public key cryptography is optional but highly recommended for all NTP operations, it is required for the NTPv4 Autokey protocol described on the Autonomous Authentication page and is an integral component of the generic automatic configuration scheme described on the Autonomous Configuration page.
		NTP is by its very nature a complex distributed network application and can be configured and used for a great many widely divergent timekeeping scenarios.
	www.eecis.udel.edu /~ntp/ntp_spool/html (1451 words)

	Network Time Protocol (Site not responding. Last check: 2007-11-07)
		The NTP control queries a network time server and returns the current time and date.
		Delay - This is the round trip delay time, in seconds, between the local computer and the server.
		Please note that if you are running an intrusion detection system which falsely interprets the series of NTP connections as a UDP port scan against the system, it will appear as if your system is being attacked by a user on the NTP server (especially if the NTP service is not available).
	bigben.stanford.edu /LabSuite/network_time_protocol.htm (576 words)

	NIST Internet Time Service (Site not responding. Last check: 2007-11-07)
		The Network Time Protocol (NTP) is the most commonly used Internet time protocol, and the one that provides the best performance.
		The strength of the time protocol is its simplicity.
		Since many computers keep time internally as the number of seconds since January 1, 1970 (or another date), converting the received time to the necessary format is often a simple matter of binary arithmetic.
	tf.nist.gov /service/its.htm (1100 words)

	GPS Time Server & Synchronization Solutions using NTP through the GPS system from Spectracom Corporation
		Our Time Server and Synchronization products offer precise, reliable, and secure solutions for many industries and a variety of applications backed by an industry-leading 5-year warranty.
		Our solutions for time synchronization include distributing timing via Network Time Protocol (NTP time servers), other precise signaling and protocols, and calibration and control of devices with accurate frequency references.
		If you are new to GPS time servers, time synchronization or frequency control, click on a link in the left pane to learn more about how our solutions, capabilities, and products benefit you.
	www.spectracomcorp.com (263 words)

	clock.org (Site not responding. Last check: 2007-11-07)
		This would be equivalent to a town with no locks on the front doors, or where the sheriff has a copy of every door key (just in case he has to search the house).
		In the mean time, use strong crypto like SSH and PGP to do your communications with so as to frustrate those who want to spy on you.
		The Internet community in the U.S.A. has won the first round against the opponents of freedom of speech and free expression, but the struggle against censorship isn't over yet; the oppressors have vowed to try once again, despite the ringing 9-0 decision against them by the United States Supreme Court.
	www.clock.org (522 words)

	ntp.org -- home of the Network Time Protocol Project (Site not responding. Last check: 2007-11-07)
		ntp.org -- home of the Network Time Protocol Project
		The ntp.org web-site has moved and is now located at
		See the NTP contact page for information on contacting us.
	www.eecis.udel.edu /~ntp (37 words)

	USNO NETWORK TIME SERVERS
		Current NTP traffic in Washington, DC Network Time Protocol (NTP) is an Internet standard protocol which enables client computers to maintain system time synchronization to the US Naval Observatory Master Clocks in Washington, DC and Colorado Springs, CO.
		It sends periodic time requests to one or more servers, obtaining server time stamps and using them to adjust the client's clock.
		All of the following stratum 1 NTP servers are open to stratum 2 servers within the same time zone and to others by arrangement.
	tycho.usno.navy.mil /ntp.html (749 words)

	RFC 1305 (rfc1305)
		Note that the operation of this timer is independent of local-clock updates, which implies that the timekeeping system and interval-timer system architecture must be independent of each other.
		Reference Timestamp: This is the local time at which the local clock was last set or corrected, in 64-bit timestamp format.
		Originate Timestamp: This is the local time at which the request departed the client host for the service h
	www.cse.ohio-state.edu /cgi-bin/rfc/rfc1305.html (17391 words)

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