dhclient and nameservers

When dhclient connects the server and retrieves the ip, it also overrides the resolv.conf with the dns information as received from the server.
If you're behind a router that information does not exist, dhclient has no idea what is the desired dns.

The solution:
edit /etc/dhcp3/dhclient.conf and just before the request option prepend the reliable dns servers, like this -
prepend domain-name-servers 212.117.129.3, 212.117.129.6


Next we want to speed the resolving names process. One way to do that is to install a local dns cache.
For more information read here

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