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Date:      Thu, 31 May 2007 18:03:58 -0400
From:      Chuck Swiger <cswiger@mac.com>
To:        Rob <r17fbsd@xxiii.com>
Cc:        FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: Help with Bind config syntax for reverse DNS on subnet
Message-ID:  <465F464E.2060503@mac.com>
In-Reply-To: <465F33B3.7090301@xxiii.com>
References:  <465F33B3.7090301@xxiii.com>

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Rob wrote:
> Hi, was hoping someone could help me with the correct syntax in my 
> named.conf for reverse DNS on a small subnet.
> 
> Say I have 10.0.0.0/27, such that actual addresses are 10.0.0.0 through 
> 10.0.0.31  -- If I add a zone like:
> zone "0.0.10.in-addr.arpa" {
>        type master;
>        file "master/0.0.10.in-addr.arpa";  };
> 
> ...I can define addresses for my little block, but reverse lookups on 
> the rest of 10.0.0.x seem to fail.  What's the correct way to configure 
> Bind for this?

That's known as "Classless IN-ADDR.ARPA delegation", and is documented here:

   http://www.ietf.org/rfc/rfc2317.txt

-- 
-Chuck



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