NTP TIME SERVICE

For Employees, Students and Third Parties

NTP stands for Network Time Protocol. The NTP is used to synchronize the time on the computer of a client or server to another server, fed by an atomic clock via the Internet. It provides for an accuracy in milliseconds for LANs and in tenths of a second for WANs, in relation to Universal Coordination Time (UCT) via, for example, the GPS (Global Positioning Service). The UCT is an international standard that gives computer clocks an accuracy of 1/10 of a second per year.

NTP configurations use many redundant servers and different network paths to achieve very high accuracy and reliability. NTP is supported by both Unix and Windows (NT4 and 2000). Some configurations contain cryptographic verifications to prevent coincidental or malicious attacks.

The UT also has such a clock. It is our intention that systems are synchronized with this clock and not with external clocks. The name of this clock is ntp.utwente.nl.

REQUESTS

This service does not require a request.

COSTS

The end user does not have to pay to use this service. These costs are passed on by LISA to the faculty or service.

CONDITIONS

No special conditions apply for this service.

DELIVERY

The service can be used immediately.

SUPPORT

For support, use the self-service page and the manuals. Should you have any other questions or should a fault occur, please contact the Service desk ICT.

ADDITIONAL INFORMATION

Below, two active public NTP-servers in the Netherlands are listed. These servers are for information purposes only and represent the best available information. The operators of these servers work on a voluntary basis and give no particular guarantees for accuracy or availability.

NL ntp1.nl.net (193.79.237.14)
Location: NLnet, Amsterdam, The Netherlands
Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3
Service Area: The Netherlands/Europe
Access Policy: open access
Contact:
beheer@nl.net

NL ntp2.nl.net (193.79.237.30)
Location: NLnet, Amsterdam, The Netherlands
Synchronization: NTP primary (GPS), Sun/Unix SunOS 4.1.3
Service Area: The Netherlands/Europe
Access Policy: open access
Contact:
beheer@nl.net

The specifications for NTP version 3 are described in RFC 1305.

MANUALS & LINKS

NTP Tijddienst

RFC 1305 specification