We recommend to use the Google Public DNS.
Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your DNS servers
If you decide to try Google Public DNS, your client programs will perform all DNS lookups using Google Public DNS.
The DNS protocol is an important part of the web's infrastructure, serving as the Internet's phone book: every time you visit a website, your computer performs a DNS lookup. Complex pages often require multiple DNS lookups before they start loading, so your computer may be performing hundreds of lookups a day.
More details: Google Public DNS
