How to check DNS settings on Mac OS X 10.7

Steps

1. Open System Preferences, either from the Dock or the Apple menu > System Preferences....
   
   
   
2. When the System Preferences window appears, click on the Network icon.
   Result: The Network configuration window appears, displaying the status of the active ports.
   
   
   

   Note: If the lock in the lower-left corner of the window is closed, you must click it and enter your Mac OS X administrator password before you can make changes to settings.

   
   
   

3. In the left-hand pane, choose the network connection you want to check.
   
   
   
4. Select the Advanced button and the DNS tab.
   • If you have manually entered settings, the MIT DNS servers will be listed in black font as shown below. If this is the case, use the minus ( - ) button to remove them.
     
     
     
   • If you're on campus and the DNS servers appear in grey font, that means they are automatically assigned. When you leave the MIT campus, your DNS settings will be updated to your local network provider. You will not be affected by the MIT DNS update.