Differences between version 20 and predecessor to the previous major change of NTPServers.
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| Newer page: | version 20 | Last edited on Tuesday, January 7, 2014 6:19:11 pm | by SamBailey | Revert |
| Older page: | version 19 | Last edited on Friday, February 1, 2013 3:39:18 am | by AristotlePagaltzis | Revert |
@@ -1,9 +1,7 @@
!!! [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
.
+For smaller networks and end users
, the best
servers to use are
the ones supplied by your service provider or ISP
.
Many [ISP]s have [NTP] servers for their customers:
* <tt>ntp.iprolink.co.nz</tt>
@@ -12,43 +10,15 @@
* <tt>time.paradise.net.nz</tt>
or you could try querying your [ISP]'s [DNS] servers with <tt>ntp</tt> or <tt>ntp1</tt>.
-Some universities have publicly accessible
servers:
-
-*
<tt>ntp
.public
.otago.ac.nz</tt> (Please notify before using)
-* <tt>
ntp.massey.ac.nz
</tt>
-
-For a long time WaikatoUniversity had public
[NTP
] servers. They are still available but no longer
publicly accessible.
-
-!! In other countries
-
-<tt>pool.ntp.org</tt> has
[NTP] server pools for many countries.
-
-* <tt>au.
pool.ntp.org</tt> Australia
-* <tt>us.pool.ntp.org</tt> United States
-* <tt>de.pool.ntp.org</tt> Germany
-* 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]
.
+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.
!!! 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/]
+If you are running
a substantial network, you should install your own Level 2
NTP servers,
based on
New Zealand standard time as described below
.
! 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).
@@ -58,32 +28,28 @@
* <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
+! .nz Registry Services
-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
.
+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>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
+* <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].
-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).
+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
/]
-* <tt>tick.usnogps.navy.mil</tt>
-* <tt>tock.usnogps.navy.mil</tt>
+!!! Universities
-Hurricane electric [operates several stratum 1
servers with good connectivity|http
://www.he.net/adm/ntp.html] on the Pacific coast of the US.
+Most universities restrict access to their NTP
servers, however some are publicly accessible
:
-* <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)
+* <tt>ntp
.public
.otago
.ac.nz
</tt> (Please notify before using
)
+* <tt>ntp
.massey
.ac
.nz
</tt>
-!! 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]
.
+For a long
time WaikatoUniversity had public
[NTP]
servers. They
are still available but no longer publicly accessible
.
!!! 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)
