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reverse dns lookup question.

when I lookup ip using the public dns tools, I type in the hostname and it returns the IP.  When I type in the IP address in reverse dns lookup, it does not return the hostname.  

HOw do I know the reverse dns record is setup correctly in public dns servers?

Please advise.

Thanks.
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nav2567
Asked:
nav2567
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1 Solution
 
cpmcomputersCommented:
If it returns nothing
There is no reverse Dns set

If it returns and incorrect (or an in-arpa )
Address
You will need to request it is modified from your service provider
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cpmcomputersCommented:
Read through this thread
It gives reasonable background to rdns

http://forums.cpanel.net/f5/how-set-reverse-dns-lookup-53575.html
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nav2567Author Commented:
Here is the problem.  We have an A record for ftp.domain1.com and a cname record ftp.domain2.com ftp.domain1.com.  We have a connection problem with ftp.domain2.com which we believe the reverse lookup record is not setup correctly.  

What do we need to tell our DNS provider?
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cpmcomputersCommented:
If this is FTP routing access (using A &cname alias)
I cannot see how rdns is involved at all?

Can you describe the connection error and what you are trying to do in more detail ?
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cpmcomputersCommented:
This article describes rdns and how it is used

http://www.simpledns.com/kb.aspx?kbid=1052

As you will see it suggests rdns is not relevant to your problem
Which is all forward resolution dependent on A and CNAME records
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