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Is rDNS good or bad?
DNS is not good or bad - you'll have to use it anyway if you want to reach your server by name.Unless you yourself are the hosting company or use very volatile/large naming system, there are very few reasons to run DNS server on the same machine where you host your site(s) - if your server goes down, DNS will go down with it. Have the hosting company or registrar handle DNS if possible - you'll have less headache for yourself. If your server can't do 'nslookup mydomain' on valid domain, it simply means your DNS client is misconfigured. I didn't quite understand the part about hackers and search engines. Both will find you regardless of where you host your DNS. If you're asking about Reverse DNS - i.e. looking up host name from IP address - again - disabling it won't give you much advantages, and will create problems if you plan to use SSL. Good luck.
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