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How to check or change your DNS settings

On July 11, 2006, the University of Pennsylvania will restrict certain types of access to its DNS servers to machines located on on-campus. The change will only adversely affect individuals who are off-campus and have manually entered Penn's DNS information into their computer. Below are instructions to verify that you are using the correct DNS settings.

To learn what the proper DNS settings are for the ISPs most commonly used in the Philadelphia area consult "DNS Server information for common ISPs".

Mac OS

  1. From the blue Apple menu, select System Preferences...
  2. Click Network.
  3. In the Show: dropdown box, select the configuration you wish to verify or modify:
    1. Select Built-in Ethernet for wired ethernet connections
    2. Select Airport for wireless connections
  4. Click TCP/IP. The appropriate network configuration is displayed.
  5. In the DNS Servers: field, make sure the appropriate DNS server(s) are entered as required by your Internet Service Provider (ISP).

    NOTE: Most ISPs deploy DHCP network configurations that require you to leave the DNS Servers: field blank. If your ISP provides you with a "static" IP address (one assigned permanetly to your account) you will need to manually enter the Preferred and Alternate DNS Server addresses provided by your ISP.

    NOTE: Most wireless networks are deployed with configurations that require you to leave the DNS Servers: field blank. If your ISP provides you with a "static" IP address (one assigned permanetly to your account) you will need to manually enter the Preferred and Alternate DNS Server addresses provided by your ISP.

Windows XP

  1. From the Start Menu select Control Panel
  2. Right-click on your network connection and select Properties
  3. Double-click on "Internet Protocol (TCP/IP)"
  4. Make sure “Obtain an IP address automatically” is selected if you are receiving your IP address via a DHCP server.
    NOTE: Most local ISPs assign IP addresses in this way.
  5. Make sure that the "Obtain DNS server address automatically" is selected.
    NOTE: If your ISP provides you with a "static" IP address (one assigned permanetly to your account) you will need to manually enter the Preferred and Alternate DNS Server addresses provided by your ISP.

Windows 2000

  1. From the Start Menu select Control Panel
  2. Right-click on your network connection and select Properties
  3. Double-click on "Internet Protocol (TCP/IP)"
  4. Make sure “Obtain an IP address automatically” is selected if you are receiving your IP address via a DHCP server.
    NOTE: Most local ISPs assign IP addresses in this way.
  5. Make sure that the "Obtain DNS server address automatically" is selected.
    NOTE: If your ISP provides you with a "static" IP address (one assigned permanetly to your account) you will need to manually enter the Preferred and Alternate DNS Server addresses provided by your ISP.

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