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I have configured a correct DNS in my wndows 2008 server, all my websites works well.

Now I hope to configure DNS Reverse Lookup, so I read http://www.windowsreference.com/dns/how-to-create-dns-reverse-lookup-zone-in-windows-server-2003/. but I do not completely understand ßthe article, what will happen if I make a mistake in my Reverse DNS Lookup configuration ? Will all my websites become unaccessable ?

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How can check if DNS Reverse Lookup is correct? –  Paul Jan 15 '12 at 8:37
    
If my server's IP is 50.30.14.56, at the Network ID for “Reverse Lookup Zone Name”, I should fill in 50.30.14 , is it right? dl.dropbox.com/u/209352/networkID.PNG –  Paul Jan 15 '12 at 8:41
    
That depends on how the reverse resolution of the IP address was delegated to you by the owner of the 50.30.14.0/24 block, which we can't know. I'd suggest you ask whoever assigned you that IP address. See RFC 2317 for an explanation of the most common setup. (Well, the most common is probably where whoever owns the /24 does the DNS for you and you just tell them the hostnames. But the common where the end user does it is RFC2317 style if you have less than a /24.) –  David Schwartz Jan 15 '12 at 9:09

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up vote 1 down vote accepted

You will add the option to translate your IP to a name. If you configure your reverse DNS in the wrong way, your A records will still work unless you start to mess with that zone. As on the how to test it, you can use dig to look for pointer records.

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Thanks! Could you tell me the details about how to use dig to look for pointer records? I'm a beginner. –  Paul Jan 15 '12 at 10:07
    
dig -x x.x.x.x where x.x.x.x is your ip –  Lucas Kauffman Jan 15 '12 at 10:13
    
Thanks! where can I find the software dig –  Paul Jan 15 '12 at 11:23
    
What problem will cause if I don't setup DNS Reverse? It seems that everything is OK, I can receive and send email, and can access website, why need I setup DNS Reverse ? –  Paul Jan 15 '12 at 11:34
    
Reverse DNS is important for one particular application. Many e-mail servers on the Internet are configured to reject incoming e-mails from any IP address which does not have reverse DNS. So if you run your own e-mail server, reverse DNS must exist for the IP address that outgoing e-mail is sent from. –  Lucas Kauffman Jan 15 '12 at 11:38

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