Open public dns server list

Changing DNS server settings on a Debian server to Google Public DNS

#http://code.google.com/speed/public-dns/
nameserver 8.8.8.8
nameserver 8.8.4.4

Other DNS serves.

#http://www.opendns.com/
nameserver 208.67.222.222
nameserver 208.67.220.220

Edit /etc/resolv.conf:
sudo vi /etc/resolv.conf

If any nameserver lines appear, write down the IP addresses for future reference.
Replace the nameserver lines with, or add, the following lines:

For IPv4:
nameserver 8.8.8.8
nameserver 8.8.4.4