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Stratum 4 Clients

A stratum 4 client is a system that gets its NTP service from one or more stratum 3 machines and which doesn't provide a service to any other systems. The well-provided-for local network will have some stratum 3 servers, which you should use in preference to any others. However, if there is none then the UIS does provide some stratum 3 servers for general use.

Central stratum 3 servers in the University

There are three stratum 3 servers in the University you can use in the absence of any local one. These have the DNS aliases:

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

Setting up a simple stratum 4 client

First, you should ask you local computer support whether there are any stratum 3 NTP servers on your local network. If there are you should use these in preference to the central stratum 3 servers.

If your NTP software can only use a single server, then you should select one of your local stratum 3 servers at random. If you don't have any local servers, select one of ours. (Roll a die if you have problems with picking things randomly.)

If your NTP software can accept a number of servers, then select three of them. Again, give preference to your local servers and use a random selection of our servers to make up the numbers.

 

If you are running a Unix system that is permanently up on the network, why not set up a stratum 3 server on your network and make it available to your colleagues?

Contact

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