Domain Name Server Security Enhancement

Description
In 2006, a change was made to the central campus Domain Name Sevice (DNS) servers to help mitigate new security risks. Because DNS servers provide the Internet address when a URL is entered in a Web browser, a very small number of individuals may have lost the ability to access the Internet when this change was made. To regain access, affected individuals will need to change a setting on their computers. Follow the instructions below to determine if you need to change your DNS setting.

Step 1: Do you have a UC Davis IP address?
Does your IP address begin with one of the following sequences?

  • 169.237
  • 128.120
  • 152.79

Yes? Stop here. You do not need to change your DNS setting.
No? Go to step 2.

Step 2. Check/Change your DNS setting
To check or change DNS settings for Windows 7, Vista, XP, and Mac OSX, follow the instructions provided below. For operating systems not listed, contact ithelp@ucdavis.edu.


Windows 7

  1. From the Start Menu select Control Panel
  2. Click on Network and Sharing Center
  3. On the left hand side, click Change adapter settings
  4. Right-click on your network connection and select Properties
  5. Double-click on "Internet Protocol Version 4 (TCP/IPv4)"
  6. If you see 169.237.250.250 and/or 169.237.1.250 in the DNS server address fields, you will need to change your settings. In most cases, the "Obtain DNS server address automatically" option is the correct setting. Check with your Internet Service Provider to be sure.

Windows Vista

  1. From the Start Menu select Control Panel
  2. Click on Network and Sharing Center
  3. On the left hand side, click Manage network connections
  4. Right-click on your network connection and select Properties
  5. Double-click on "Internet Protocol Version 4 (TCP/IPv4)"
  6. If you see 169.237.250.250 and/or 169.237.1.250 in the DNS server address fields, you will need to change your settings. In most cases, the "Obtain DNS server address automatically" option is the correct setting. Check with your Internet Service Provider to be sure.

Windows XP

  1. From the Start Menu select Control Panel
  2. Click on "Network and Internet Connections", then "Network Connections"
  3. Right-click on your network connection and select Properties
  4. Double-click on "Internet Protocol (TCP/IP)"
  5. If you see 169.237.250.250 and/or 169.237.1.250 in the DNS server address fields, you will need to change your settings. In most cases, the "Obtain DNS server address automatically" option is the correct setting. Check with your Internet Service Provider to be sure.

Mac OS X

  1. From the Apple menu, select System Preferences
  2. Click the Network button
  3. Select your active internet connection on the left (Ethernet or AirPort, for example)
  4. Click the Advanced button on the bottom right
  5. Click the DNS Tab
  6. If you see 169.237.250.250 and/or 169.237.1.250 in black text for the "DNS Servers" field, you will need to change your settings. In most cases, removing these values and leaving this box blank is the correct setting. Check with your Internet Service Provider to be sure.