Configuring a Caching Name Server
The Red Hat/Fedora default installation of BIND is configured to convert your Linux box into a caching name server. The only file you have to edit is /etc/resolv.conf; you'll have to comment out the reference to your previous DNS server (most likely your router) with a # or make it point to the server itself using the universal localhost IP address of 127.0.0.1.
So, your old entry of:
nameserver 192.168.1.1
would be replaced by a new entry of:
# nameserver 192.168.1.1
or
nameserver 127.0.0.1
The next step is to make all the other machines on your network point to the caching DNS server as their primary DNS server.
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