reverse Zone example!

Doug Barton dougb at dougbarton.us
Sun Feb 7 20:17:00 UTC 2010


On 02/07/10 12:03, Alans wrote:
> Hello,
> I thought the reason is because it's weekend :)

Hope springs eternal. :)

> I have a DNS for domain example.com
> One of my customers have a domain customersdomain.com and they have their
> own DNS (forward lookups)

FYI, the forward domains have no relationship whatsoever to the reverses.

> They want me to add ptr (smaller than /24) for them

You have now provided more information, but still not enough for a 
useful answer. Did you read the information at the web site I posted? 
There is no harm in just telling us what IP blocks you're working with, 
and if you don't, the answers we give you might not actually solve your 
problem.

For example, how many IP addresses are we talking about here, and how 
often might the reverse DNS information change? If you're only talking 
about a few addresses, and the forwards are not going to change often, 
it might be easier for you to just add the PTR records in your own 
reverse zone, assuming that the DNS information for that zone is 
delegated to you in the first place.

Assuming that you really do need to delegate the DNS for them, what you 
want is an "RFC 2317 delegation," which you can read about in, you 
guessed it, RFC 2317. :)  http://tools.ietf.org/html/rfc2317  If that 
doesn't answer all of your questions then to help you further we need 
you to provide us with the following:

1. What netblock is assigned to YOU?
2. What range do you want to delegate to the CUSTOMER?
3. Do you have a zone file for your netblock already?
4. What nameservers do you have the zone configured on now?

... and just in case it's not obvious yet, what you posted won't work, 
which is why we need to dig a little deeper.


hth,

Doug

> -----Original Message-----
> From: Doug Barton [mailto:dougb at dougbarton.us]
> Sent: Sunday, February 07, 2010 10:13 PM
> To: Alans
> Cc: 'BIND Users Mailing List'
> Subject: Re: reverse Zone example!
>
> On 02/06/10 00:49, Alans wrote:
>> Hi everyone,
>>
>> Anyone can give me an example of a reverse zone for a customer (have
>> their own DNS) from an ISP (own customers IP)?
>>
>> Just want to make sure what is did is right or no? I'm a little confused
>> about the SOA and ns records in the zone file, should be ours (ISP) or
>> customers DNSs!
>
> FYI, the reason that you haven't gotten a useful answer yet is that you
> haven't provided us enough information.
> http://dougbarton.us/DNS/bind-users-FAQ.html#RealNames
>
> In order to answer your question we need to know what kind of address
> blocks you're attempting to set up DNS for. I suspect that you're
> probably trying to set up DNS for something smaller than a /24, is that
> right? If you can respond with more details, it's likely we can help you.
>
>
> Good luck,
>
> Doug
>



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