No matter how many times I have installed and configured Linux, I can never remember the name of the configuration file that stores the DNS/Nameserver details. This really only applies if your Linux machine is using a static IP address. In most scenarios, it does not apply to DHCP clients.

DNS server settings are stored in /etc/resolve.conf To edit this file, enter the following command from the shell

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$sudo nano /etc/resolv.conf

(If you have installed XWindows/Gnome, you can use sudo gedit /etc/resolve.conf instead)

Add the entries for your DNS or nameservers as follows

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nameserver <IP address of DNS server 1>
nameserver <IP address of DNS server 2>

etc…