So I'm trying to configure my Mac for use with OpenDNS since I think Charter's DNS servers are slowing me down. I unplug my router. Go to System Prefs Network Advanced DNS tab and there's nothing there (there is when I am connected but it's grayed out) so I add 18.104.22.168 & 22.214.171.124, apply, etc... Plug in the router and Charter's DNS servers are back in there in addition to the OpenDNS ones at the bottom. Why? Why is my Mac automatically setting the DNS?