I am trying to set an open DNS using the MacAir. But when I tried to flush the existing one at utilities/terminal, it will not work.  I am using Yosemite.  May I know what should be the command line so that I can shift to an open DNS?  Thanks

I am trying to set an open DNS using the MacAir. But when I tried to flush the existing one at utilities/terminal, it will not work.  I am using Yosemite.  May I know what should be the command line so that I can shift to an open DNS?  Thanks

>SystemPreferences>Network>DNS

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