Examples
Cube Config Screenshot:
http://www.brokejoker.com/cubeproblem/cubeinfo-bottom.jpg



8.8.8.8 is one of Google's public DNS servers.  If you are routing to a name... just like you do when you put in "http://bitcointalk.org" in your browser, DNS will have to convert it into a valid IP address in order to find and locate that destination on the Internet.  If you use 192.168.1.1, then your router must forward DNS to something else; your router will likely have DNS servers plugged in for that purpose.  However, if you are in doubt, you can change both DNS locations to somewhere... OpenDNS, UltraDNS, Google etc and bypass your router all together.  However, you can also just manually lookup the IP address, and put all zero's in as the DNS servers.  

Since I'm using a local proxy, this is what my settings look like:
http://s7.postimg.org/5owg9v67f/BE_Cube_Miner_2.png