Often, I find that I have a perfectly working DHCP configuration, but I want to set custom Internet-based DNS. One way to do this for all connections no matter what, is to find a file called dhclient.conf (in current Debian Testing, it’s in /etc/dhcp3), and add the following line to the end:
prepend domain-name-servers 208.67.222.222,208.67.220.220,8.8.8.8,8.8.4.4;
If you need your system to automatically use the DNS servers on a LAN at each DHCP connection, this is not for you, but if you want really good Internet DNS no matter where you go, this is a great shortcut. The above servers are kept by OpenDNS and Google.
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