Best Practices for DNS/NTP Settings


 Introduction

This document is primarily for ITS system administrators. It lists the recommended DNS and NTP settings which should be used for the servers you are responsible for.

UNC ITS now has three geographically distinct machine rooms for DNS and NTP (Network Time Protocol) coverage, with servers in all three locations. Particularly when configuring critical ITS servers (where you want maximum service availability), our recommendation to those ITS system administrators is outlined below.

 DNS Settings

If your server is in ITS-Phillips and has an IP address in the range 152.2.0.x - 152.2.3.x, the following should be your DNS settings:

  • 152.2.0.26

  • 152.2.21.1

  • 152.2.46.3

  • 152.2.253.100

If your server is in ITS-Phillips and its IP address is NOT in the range 152.2.0.x - 152.2.3.x, the following should be your DNS settings:

  • 152.2.21.1

  • 152.2.253.100

  • 152.2.46.3

  • 152.2.0.26

If your server is in ITS-Franklin, the following should be your DNS settings:

  • 152.2.46.3

  • 152.2.21.1

  • 152.2.253.100

  • 152.2.0.26

If your server is in ITS-Manning, the following should be your DNS settings:

  • 152.2.0.26

  • 152.2.21.1

  • 152.2.253.100

  • 152.2.46.3

 NTP/Clock Settings

If your server is in ITS-Phillips, the following should be your NTP settings:

  • clock1.unc.edu

  • clock2.unc.edu

  • clock3.unc.edu

If your server is in ITS-Franklin, the following should be your NTP settings:

  • clock3.unc.edu

  • clock1.unc.edu

  • clock2.unc.edu

If your server is in ITS-Manning, the following should be your NTP settings:

  • clock4.unc.edu

  • clock1.unc.edu

  • clock2.unc.edu

 More Information

If you have any questions, please email .

Copyright 2002-2007 The University of North Carolina at Chapel Hill.

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 United States License.

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