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- Newsgroups: comp.sys.next.sysadmin
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!udecc.engr.udayton.edu!blackbird.afit.af.mil!news
- From: druck@.afit.af.mil (Dennis W. Ruck)
- Subject: Re: A site for syncing my nettime (timed)
- Message-ID: <1992Nov19.174310.23190@afit.af.mil>
- Sender: news@afit.af.mil
- Nntp-Posting-Host: gandalf.afit.af.mil
- Reply-To: druck@afit.af.mil (Dennis W. Ruck)
- Organization: Air Force Institute of Technology
- References: <1992Nov12.140314.22966@worldbank.org>
- Date: Thu, 19 Nov 1992 17:43:10 GMT
- Lines: 84
-
- masud cader writes
- >Is there a site on the Internet which keeps time. I would like to sync my
- >master timekeeper with something reliable on the net (Atomic clock anyone?).
- >
- >Thanks. Please reply to mcader@worldbank.org
-
- Here is the header portion of a file (clock.txt) I downloaded from somewhere. I
- think it was louie.udel.edu. The list of time servers is too large to post
- (IMHO). You should contact your site administrator. They may already be syncing
- to other time servers in which case you can sync off of a local machine.
-
- ========================================================================
- = Information on NTP Time Servers and Radio Timecode Receivers =
- = This update 6 July 1992, last update 29 May 1992 =
- ========================================================================
-
- General Information
-
- This file is provided for information purposes only and represents the
- best information available at the date posted above. It does not
- represent a commitment to provide connectivity or time service on the
- part of the operators involved. Further information of a technical
- nature can be obtained from the ntp@trantor.umd.edu list. To subscribe
- to this list, contact ntp-request@trantor.umd.edu (Louie Mamakos).
- Alternatively, if possible, please subscribe to the USENET newsgroup
- comp.protocols.time.ntp which is gatewayed to the mailing list.
-
- Time Servers
-
- As the load on the hosts supporting NTP primary time (stratum 1) service
- is heavy and always increasing, clients should avoid using the primary
- servers whenever possible. In most cases the accuracy of the secondary
- servers is only slightly degraded relative to the primary servers and,
- as a group, the secondary servers may be just as reliable. As a general
- rule, a client should use a primary server only under the following
- conditions:
-
- 1. The server provides synchronization to a sizable population of
- clients on the order of 100 or more.
-
- 2. The server operates with at least two and preferably three other
- servers in a common synchronization subnet designed to provide
- reliable service even if some servers or the lines connecting them
- fail.
-
- 3. The administration(s) that operates the subnet coordinates other
- clients within the region service is provided in order to reduce
- the resources required outside that region. Note that at least some
- interregional resources are required in order to ensure reliable
- service.
-
- In order to ensure reliability, clients should spread their use over
- many different servers. As a general rule, no more than two clients per
- network should use the same server on another network; however, in order
- to simplify management of host configuration tables, many hosts on the
- same network may use the same (redundant) servers on the same network.
- Further information on client configuration can be found in the file
- pub/ntp/doc/ntpinfo.Z and in the documentation in the NTP Unix daemon
- distributions ntp.3.4 and xntp in the pub/ntp directory on
- louie.udel.edu.
-
- Following is a list of NTP primary and secondary time servers known to
- be connected to the Internet and may be available for external access.
- Each entry gives the host name, Internet address, approximate location
- and geographic coordinates if available, synchronization source
- (stratum, type of radio or satellite receiver and host type), suggested
- service area, access policy (as notified) and contact name and e-mail
- address. It is always wise to consult the DNS to verify host addresses,
- which are changed from time to time. When more than one address is
- given, preference should given to each in order. All servers are
- equipped with uncompensated crystal-stabilized timebases, unless
- indicated otherwise.
-
- The contact person should always be notified upon establishment of
- regular operations with servers listed as open access. Please respect
- the access policy as stated by the contact person. Servers listed as
- closed access should NOT be used without prior permission, since this
- may disrupt ongoing research in which these servers are involved.
-
-
- --
- Dennis W. Ruck Air Force Institute of Technology
- druck@afit.af.mil Wright-Patterson AFB, Ohio
- (NeXTmail Welcome)
-