* Terence Chang (peanutlen@yahoo.com) wrote:
> 1. Do I need to have multiple boxes for primary,
> secondary and cache DNS servers? 

Ideally.

> 2. What DNS Server software do I use?

There's a small learning curve, but the payoff is huge -- worry free
operation:  http://cr.yp.to/djbdns.html

> 3. Is there any web program (PHP) that can update the
> DNS server at real time? 

pptthh!

> [ .. eywh! Hard questions. ] 

hth,
Gontran