What is Google Public DNS?

Google Public DNS is a free, global Domain Name System (DNS) resolution service, that you can use as an alternative to your current DNS provider.

To try it out:
Configure your network settings to use the IP addresses 8.8.8.8 and 8.8.4.4 as your DNS servers or  

 Introducing Google Public DNS

Today, Google has announced the launch of their free DNS resolution service. Many ISPs and 3rd party provider such as OpenDNS snoops around or send traffic to ad servers. However, Google promises not to play with end users and send the exact response his or her computer expects without performing any blocking, filtering, or redirection that may hamper a user's browsing experience. In other words Google will not hijacking your traffic on non-existent domain name and it will follow strict RFC standard.

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 complete loading. As a result, the average Internet user performs hundreds of DNS lookups each day, that collectively can slow down his or her browsing experience.

Google DNS Server IP Addresses The Google Public DNS IP addresses are as follows:
8.8.8.8
8.8.4.4

How Do I Add Google DNS Server IP Address Under Linux?Simple edit the /etc/resolv.conf file and add above two ip address:
nameserver 8.8.8.8 nameserver 8.8.4.4  ::NOTE:: for more information visit http://googlecode.blogspot.com/2009/12/introducing-google-public-dns-new-dns.htmlor http://code.google.com/speed/public-dns/docs/using.html