Every piece of information I could find on name servers says you need at least 2 : primary and secondary. I understand the importance of this in networks. You don't want your site to be unreachable because your primary name server, located on another machine, is down. But if you have a small (micro) hosting business and all your domains are hosted on the same physical machine, including your primary name server, is there a point in setting up a secondary name server? If your primary name server is unreachable for some reason, hosts on the same machine will also be unreachable anyway... will a secondary name server on the same machine (or elsewhere) make any difference? Thank you for any info on this obscure DNS thing.