Macbook can't resolve any domain names
I think it has to do with Bonjour (mDNSResponder). Check out this page.

Run the following command in a Terminal:

ps aux | grep mDNS


This should tell you whether or not /usr/sbin/mDNSResponder is running. If it is not, run the following command to launch it:

sudo /usr/sbin/mDNSResponder