skip to primary navigationskip to content
 

Client Systems

Some local networks within the University have their own NTP servers, so if your local IT staff provide recommendations for NTP configuration, follow those. Otherwise, read on.

Full NTP clients

If your NTP client software allows you to configure multiple servers, you should use some or (preferably) all of:

  • ntp0.cam.ac.uk
  • ntp1.cam.ac.uk
  • ntp2.cam.ac.uk
  • ntp3.cam.ac.uk

If you can't configure all of them, prefer the ones with lower numbers.

If using the Official Reference Implementation of NTP, or chrony, a configuration like this is recommended:

server ntp0.cam.ac.uk iburst
server ntp1.cam.ac.uk iburst
server ntp2.cam.ac.uk iburst
server ntp3.cam.ac.uk iburst

Simple NTP (SNTP) clients

Simple NTP (SNTP) clients can only handle a single server. These should be configured to use sntp.cam.ac.uk. While each of ntp0, ntp1, etc refers to a single physical server, sntp is a virtual address that is automatically moved between servers so that it's (almost) always available.

IP addresses

Some clients can't handle DNS names, or need to work when DNS isn't available. You can use the IP addresses (IPv4 or IPv6) corresponding to the names above. Be aware, though, that they might change. We intend to keep any withdrawn address working for at least a year after it's removed from the DNS, so if you update the addresses once a year you should be fine.

Contact

If you have any enquiries regarding UIS network services, or other University network topics, please send an email to:

UIS Service Desk


  Phone padded  01223 332999

UIS Service Status

Phone padded  Service status line: (01223) 463085
Website  Sign up for SMS/email status alerts
Website  Read major IT incident reports

UIS bITe-size bulletin


A regular newsletter aimed at the University's IT community, highlighting service and project news from UIS.

Sign up >  |  Back issues

RSS Feed Latest news

Wireless service maintenance on 13 and 19 November

Nov 12, 2019

The Wireless Service will be subject to interruption between 07:30 and 09:00 on Wednesday 13 and Tuesday 19 November while we carry out essential maintenance.

Windows 7 end-of-life countdown: 2 months to go

Nov 01, 2019

There are only 2 months left until Windows 7 reaches end of life, after which Microsoft will no longer supply security updates and bug fixes for the operating system.

View all news