Classless Reverse zones

[Bob Vance]

>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?


-------------------------------------------------
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BV         | <mailto:BobVance at alumni.caltech.edu>
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-----Original Message-----
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
are for
> 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
domain?

	Normally it's 4 consecutive, bit aligned, NS RRsets.

>
> This is all for internal DNS setup not connected with the internet at
all
> and we're getting lots of these subnets being used for dynamic
updates, and
> 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
	want to.

	Mark
>
> Thanks,
>
> 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
not
> necessarily represent those of Westpac Banking Corporation.
>
>
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Mark Andrews, Nominum Inc.
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