Classless Reverse zones
bobvance at alumni.caltech.edu
Thu Mar 15 20:39:28 UTC 2001
>Normally it's 4 consecutive, bit aligned, NS RRsets.
What in the heck does that mean? :)
>It really shouldn't be used for /0-/24.
Why is that?
I was thinking that it would be used anytime you want to delegate on
*non-octet* boundaries, not just sub "Class C". The reverse lookup is
based on the octets, so if there is a split in authority in *any* of the
octets, then CNAMEs could be used to point to the correct zones.
Am I wrong?
Tks | <mailto:BVance at sbm.com>
BV | <mailto:BobVance at alumni.caltech.edu>
Sr. Technical Consultant, SBM, A Gates/Arrow Co.
Vox 770-623-3430 11455 Lakefield Dr.
Fax 770-623-3429 Duluth, GA 30097-1511
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org]On
Behalf Of Mark.Andrews at nominum.com
Sent: Wednesday, March 14, 2001 9:27 PM
To: "Peter Anderson"
Cc: comp-protocols-dns-bind at moderators.isc.org
Subject: Re: Classless Reverse zones
Classless IN-ADDR using CNAMES is for cases where you can't
use classic delegation techniques and don't what to delegate
each individual reverse address. It really shouldn't be
used for /0-/24.
> Has anyone created a zone with a 22 bit (or less) mask and $GENERATE?
Yes. You use 4 $GENERATE statements.
> I can't seem to get it to work and all the other examples I've found
> subsetting a class C subnet.
That's what it was designed for.
> For example with a 22 bit mask do you have 4 NS recs in the parent
Normally it's 4 consecutive, bit aligned, NS RRsets.
> This is all for internal DNS setup not connected with the internet at
> and we're getting lots of these subnets being used for dynamic
> I'm trying to work out a way of reducing the number of zones.
I think you have enough information to do that if you still
> Peter Anderson
> Senior Communications Analyst
> <Remove ETER from my address to reply>
> Any views or opinions presented are solely those of the author and do
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Mark Andrews, Nominum Inc.
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