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| Newer page: | version 30 | Last edited on Monday, September 19, 2005 1:15:40 pm | by AristotlePagaltzis | Revert |
| Older page: | version 29 | Last edited on Monday, September 19, 2005 12:40:39 pm | by IanMcDonald | Revert |
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An [Acronym] for __N__etwork __T__ime [Protocol].
A protocol that allows synchronising a computer's internal clock (and system time) with an external source, such as a computer with a more accurate clock. Machines that are synchronised with an atomic clock or [GPS] are stratum 1. Machines that synchronise to these machines are stratum 2, and so on.
Normally stratum 1 machines aren't available for public connections.
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-!!! [NTP] in NewZealand
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-Have a look at http://www.cosc.canterbury.ac.nz/research/reports/TechReps/1999/tr_9901.pdf for a scientific study (from 1999) of the topology of the country's main [NTP] servers. (A bit dated as [GPS] is much more widely available now).
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-There is a pool of NewZealand 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.
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-!!! Stratum 1 [NTP] servers in NewZealand
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-The Measurements Standards Laboratory at Industrial Reasearch Limited run a HP5071A caesium atomic clock which is part of the New Zealand time standard. This server is available at the address msltime.irl.cri.nz. [Read more details. | http://msl.irl.cri.nz/services/time/ntpServer.html]
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-TelstraClear generously provides a stratum 1 [NTP] server for public use:''''
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- <tt>bigben.clix.net.nz</tt>
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-However, you really shouldn't synchronise to a stratum one server for your small network -- if everyone did that then the server would probably need too much bandwidth. Please read http://list.waikato.ac.nz/pipermail/nznog/2001-October/003705.html. The difference in accuracy between synching to a stratum 1 server and a lower stratum server is negligible!
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-For example, read http://www.cs.wisc.edu/~plonka/netgear-sntp/ -- in summary, ~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.
-
-!!! Other [NTP] Servers
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-Some NewZealand [ISP]s have NTP servers for their customers:
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-* <tt>ntp.iprolink.co.nz</tt>
-* <tt>ntp.iconz.co.nz</tt>
-* <tt>tk1.ihug.co.nz to tk3.ihug.co.nz</tt>
-* <tt>time.paradise.net.nz</tt>
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-or you could try querying your [ISP]'s [DNS] servers with <tt>ntp</tt> or <tt>ntp1</tt>.
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-Many of NewZealand's Universities also have public time servers such as:
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-* <tt>ntp.public.otago.ac.nz</tt> (Please notify before using)
-* <tt>ntp.massey.ac.nz</tt> (Use the [DNS] name, as its [IP] changed recently and is now hosted by two machines)
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-For a long time WaikatoUniversity had public [NTP] servers. They are still available but no longer publicly accessible.
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-!!! [NZ] Pool
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-Your best bet for a small home or office network is to set your server to <tt>nz.pool.ntp.org</tt> or <tt>pool.ntp.org</tt>, which will use RoundRobin [DNS] to choose one of the many servers now registered with that project.
-
-!!! German [NTP] servers
-
-If you live in Germany (or somewhere close by) you may want to try this list:
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-* <tt>time1.rrz.uni-koeln.de</tt>
-* <tt>time2.rrz.uni-koeln.de</tt>
-* <tt>time3.rrz.uni-koeln.de</tt>
-* <tt>ts-1.rz.rwth-aachen.de</tt>
-* <tt>ntp1.t-online.de</tt>
-* <tt>www1.rrz.uni-koeln.de</tt>
-* <tt>hora.cs.tu-berlin.de</tt>
-* <tt>rustime01.rus.uni-stuttgart.de</tt>
-* <tt>rzfs2.rz.tu-bs.de</tt>
-* <tt>ns1.hrz.uni-giessen.de</tt>
-* <tt>ntp2-rz.rrze.uni-erlangen.de</tt>
-* <tt>mailbox.tu-berlin.de</tt>
-* <tt>ntps1-0.cs.tu-berlin.de</tt>
-* <tt>ntp0.fau.de</tt>
-* <tt>ntp1.fau.de</tt>
-* <tt>ntp2.fau.de</tt>
-* <tt>ntp3.fau.de</tt>
-* <tt>ptbtime1.ptb.de</tt>
-* <tt>ptbtime2.ptb.de</tt>
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-You might also want to look at a [very extensive list of public German NTP servers | http://www.hullen.de/helmut/filebox/DCF77/ntpsrvr.html].
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-!!! Other non-[NZ] servers
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-As mentioned above, <tt>pool.ntp.org</tt> is a RoundRobin [DNS] for many [NTP] servers. Try <tt>''cc''.pool.ntp.org</tt>, where ''cc'' is a CountryCode.
-
-* [A list of stratum 1 time servers | http://www.eecis.udel.edu/~mills/ntp/clock1a.html]
-* [A list of the stratum 2 time servers | http://www.eecis.udel.edu/~mills/ntp/clock2a.html]
! See also:
* ntpd(1)
* ntpdate(1)
* hwclock(8)
+* [NTPServers]
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Part of CategoryNetworking
