NameServer Caching
From KlavoWiki
Install the cching nameserver
yum install caching-nameserver
Edit the file /etc/resolv.conf so the operating system looks for the local name server first. the entry below should be listed as the first nameserver entry.
nameserver 127.0.0.1
Start the service
/etc/init.d/named start
Set for automatic startup on system boot.
chkconfig named on