Reverse DNS

[Bill Studley]

Brenda you might want to look at:

http://www.acmebw.com/askmrdns/

it's a neat site that has some simple amswers to DNS questions.

for  in-addr.arpa delegation of domains smaller than a class "C",  try a 
search on "classless in-addr.arpa delegation"

HTH,
Bill

Brenda A. Bell wrote:

>Can someone point me to a good resource for getting a better
>understanding of reverse DNS and the role it plays in the big picture?
>I understand dig and use it frequently, but I'm trying to get a better
>understanding of my current DNS setup, why things work the way they do
>and whether my config is acceptable.  I'll explain:
>
>I have a permanent IP address I got from my ISP.  When I dig my ISP's
>nameservers for my IP, I get a PTR record for
>111-195-35-64.mcttelecom.com.
>
>I have a small network from which I host a web server and and an email
>server.  I don't particularly want to (or need to) run a full-fledged
>DNS on my own network, so I use ZoneEdit.  While I only have a single IP
>address, I have entries at ZoneEdit for my domain, my mail server and my
>web server.  This is where I start to get a little confused...
>
>A dig against my ISP's nameserver for my reverse IP address gives an
>authoritative answer -- makes sense since it does own the address and it
>has the PTR record.  A dig against ns1.zoneedit.com for my domain name
>gives an authoritative answer.  A dig against ns1.zoneeedit for my
>reverse IP simply refers me to the root servers.
>
>I don't see evidence of any problems occurring because of this setup,
>but I remember reading somewhere that your RR's should be correct in
>order for you to be considered "clean"... at the same time, I can't
>imagine that my scenario is uncommon given the number of people who run
>small home setups like mine.
>
>Some good references or opinions on the subject would be most
>appreciated.
>
>Brenda
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>
>  
>