Differences between version 19 and predecessor to the previous major change of NTPServers.
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Newer page: | version 19 | Last edited on Friday, February 1, 2013 3:39:18 am | by AristotlePagaltzis | Revert |
Older page: | version 17 | Last edited on Friday, February 1, 2013 3:32:53 am | by AristotlePagaltzis | Revert |
@@ -1,5 +1,5 @@
-!!! [NTP] Servers
+!!! [NTP] Servers For Everyone
!! In NewZealand
There is a pool of servers at <tt>nz.pool.ntp.org</tt>, which provides RoundRobin [DNS] access to publicly accessible [NTP] servers that have agreed to be part of the pool.
@@ -30,9 +30,60 @@
* Etc. Try <tt>''cc''.pool.ntp.org</tt>, where ''cc'' is a country code.
[List of public German NTP servers | http://www.hullen.de/helmut/filebox/DCF77/ntpsrvr.html].
-!! See also
+!!! Stratum 1 Servers
+
+First: __be nice!__ You shouldn't synchronise to a stratum 1 server for your small network -- if everyone did that then the server would need too much bandwidth. For example. NetGear hard-coded a public [NTP] server into some of their consumer products, which eventually ended up using hundreds of Mbits/second of the university's bandwidth, even after they were forced to shut down the server.
+
+The difference in accuracy between syncing to a stratum 1 server and a lower stratum server is negligible.
+
+!! NewZealand
+
+! .nz Registry Services
+
+There are [three stratum 1 NTP servers provided by .nz Registry Services (NZRS)|http://ntp.net.nz/] for network operators based within New Zealand.
+
+* <tt>s1.ntp.net.nz</tt> in Albany connected to [FX].
+* <tt>s2.ntp.net.nz</tt> in Auckland connected to [ICONZ] and [APE].
+* <tt>s3.ntp.net.nz</tt> in Wellington connected to [FX] and [WIX].
+
+All three are Symmetricom S300 NTP servers, each connected to a differential GPS antenna on the roof and each with a rubidium oscillator to provide a stable clock in the event of an issue with the GPS signal. [more|http://ntp.net.nz/architecture/]
+
+! The Measurement Standards Laboratory
+
+The standard for time in New Zealand is maintained by the [Measurement Standards Laboratory|http://msl.irl.cri.nz/], part of [Industrial Research Limited|http://irl.cri.nz/]. MSL runs several public NTP servers that are referenced to UTC(MSL).
+
+* <tt>msltime.irl.cri.nz</tt>
+* <tt>msltime1.irl.cri.nz</tt>
+* <tt>msltime2.irl.cri.nz</tt>
+
+They are FreeBSD-based servers that are directly connected to their master HP5071A caesium clock. [more|http://msl.irl.cri.nz/services/time-and-frequency/ntp-server-information]
+
+!! United States
+
+The US National Institute of Standards and Technology ([NIST]) operates [several publicly accessible stratum 1 time servers|http://tf.nist.gov/tf-cgi/servers.cgi] on the Pacific coast of the US. These servers are referenced to UTC(NIST) using the NIST Automated Computer Time Service (ACTS), a MoDem-based service established in 1988.
+
+* <tt>nist1.symmetricom.com</tt> San Jose, California
+* <tt>nist1-sj.ustiming.org</tt> San Jose, California
+* <tt>nist1-la.ustiming.org</tt> Los Angeles, California
+* <tt>nist1.aol-ca.symmetricom.com</tt> Mountain View, California
+
+The US Naval Observatory (USNO) [operates several stratum 1 time servers from its Alternate Master Clock Facility (AMCF)|http://tycho.usno.navy.mil/clocks.html] at [Schriever Air Force Base|WikiPedia:Schriever_Air_Force_Base], [near Colorado Springs|http://maps.google.com/maps?q=schriever+afb], on the same site as the [GPS] Master Control Station. These servers are referenced to UTC(USNO).
+
+* <tt>tick.usnogps.navy.mil</tt>
+* <tt>tock.usnogps.navy.mil</tt>
+
+Hurricane electric [operates several stratum 1 servers with good connectivity|http://www.he.net/adm/ntp.html] on the Pacific coast of the US.
+
+* <tt>clock.sjc.he.net</tt> San Jose, California (CDMA, Endrun Praecis CNTP)
+* <tt>clock.fmt.he.net</tt> Fremont, California (GPS, Symmetricom NTS-150)
+
+!! Australia
+
+The Australian National Measurement Institute (NMI) maintains the Australian time standard, UTC(AUS) using caesium and hydrogen maser standards. NMI [maintains a number of NTP servers which are referenced to UTC(AUS)|http://www.measurement.gov.au/Services/Pages/TimeandFrequencyDisseminationService.aspx]. To use these servers, you need to register via [Email].
+
+!
!! See also
* [NTPNotes]
* TimeSources
* [Scientific study from 1999 on the topology of the country's main NTP servers | http://www.cosc.canterbury.ac.nz/research/reports/TechReps/1999/tr_9901.pdf ] (note that [GPS] is much more widely available now)