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How to set up various functions of DNS and why you might want to do so...
The idea here is that you want to run a local nameserver for its caching abilities, but you're not serving up authoritative DNS information of your own or for someone else. You just want local machines to have somewhere _local_ to query for name lookups, rather than having all queries go across the wire to your ISP or elsewhere -- in order that, most of the time, the answer's already in your nameserver's cache because some other local machine also made the same query in the recent past.
How do you enable it, you ask? You just turn on your nameserver. Conventional DNS daemons (BIND9, MaraDNS, Posadis, PowerDNS, Twisted Names, Yaku-NS) default to that sort of service, so you just switch them on, and they work.
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