NOTE: there is a separate web page dedicated to NTP, with topics on choosing a platform and setting-up a good NTP server, on time, time dissemination and calendar in general, and on NTP in Slovenia, including many links for further reading.
Please visit http://www.ijs.si/time/
IJS operates several NTP time servers: one public (with restrictions) stratum-1 server goodtime.ijs.si with GPS time receiver, one public stratum-2 server time.ijs.si, and three lower-stratum servers for internal use (ntp1.ijs.si, ntp2.ijs.si, ntp3.ijs.si). Supported protocols are NTP (version 3 and 4) and SNTP.
IJS users should consult the internal document host setup guidelines regarding time synchronization servers, recommended software, and supported protocols (not accessible from outside, sorry).
The setup of our NTP servers is coordinated with other NTP servers in Slovenia.
As a way of returning service to the Internet, The Institute "Jozef Stefan" makes available two of its NTP time servers as public time servers. In return we expect our service to be used efficiently, for you to get most out of it, and for us to keep load on our servers and network under control, resulting in beter quality of service.
By efficiently we mean in particular:
As a corollary to the above: do not use our time servers directly from simple SNTP clients running on end-users' dial-up or desktop PCs, which should be getting time from their ISP's time servers, or time servers on their local network.
Feel free to 'test ride' our servers for a limited period of time (a day or a few days seems reasonable) before committing to regular use.
The NTP burst mode synchronization method must not be used on a regular basis without permission against any of our NTP servers. Occasional experimental use or initial burst mode synchronization during boot is tolerated.
Other time protocols such as time protocol (rfc868) or daytime protocol (rfc867) are not supported for external clients, and access by external SNTP clients (rfc2030) is strongly discouraged. These protocols were designed for synchronization within the local network where network delays and jitter are small; they do not operate well over WAN without special considerations.
IJS public time servers should not be included without prior permission in lists of time servers, or otherwise be made known to software which violates the above requirements or does not encourage hierarchical time dissemination principles.
Use the NTP client mode against our servers (configuration command is: server in your NTP configuration file). Symmetric modes (command peer) will most likely not work.
We might occasionally run queries (NTP control messages 6 and 7 -- ntpd and ntpdc, and perhaps ping and traceroute) for statistical and quality control purposes to the NTP clients that use our servers. If this is going to trigger a complaint or investigation, please do not use our servers.
If you have special requirements or if you need more information, please contact Mark Martinec at timekeeper@ijs.si .
For other NTP servers in Slovenia please see section Public NTP servers in Slovenia in the document http://www.ijs.si/time/
List of all public NTP servers is maintained at http://ntp.isc.org/bin/view/Servers/
Document created on 2000-05-10 by Mark Martinec, updated: 2000-05-24, 2000-06-19, 2000-11-16, 2000-12-12, 2003-04-14, 2004-09-24, 2005-01-25.