BIND 8.2.3 Classless Example

[Bob Vance]

Please help me out, Edward -- *I'm* confused by your example :)

>Classless delegation is independent of the number of
>DNs.  You might have one DN and several non-contiguous
>7-bit subnets; there are other possibilities.

True, but really a non-sequitur, I think.

I believe that your example on the web site is still incorrect.

The CNAMEs in the "full" reverse zone should point to some *other*
zone, otherwise, what's the point (maybe I'm missing something), even if
it were allowed.

$ORIGIN 4.168.192.in-addr.arpa.
   ...
$GENERATE 1-127 $ CNAME $.0/25.4.168.192.in-addr.arpa.
$GENERATE 129-254 $ CNAME $.128/25.4.168.192.in-addr.arpa.

That is fine -- satisfies the "real" reverse request ...

But why try to have the canonical data in *this* same zone??? :
   ... ;;;; (above zone file continues)
$ORIGIN 0/25.4.168.192.in-addr.arpa.
1  IN PTR one.test.com.
2  IN PTR two.test.com.
3  IN PTR tre.test.com.

There is no benefit from it.  You would achieve the same thing by simply
removing the CNAMEs and the 0/25 $ORIGIN, without the extra lookup!!

Those sub-zone PTRs should be in *another* zone (in fact, usually
delegated to someone else :)  :

;;;
;;;zone file at authority for "full" reverse zone
;;;
$ORIGIN 4.168.192.in-addr.arpa.
   ...
$GENERATE 1-127 $ CNAME $.0/25.4.168.192.in-addr.arpa.
0/25   IN  NS   ....   ;; delegation

;;;
;;;zone file at authority for "partial" reverse zone
;;;
;;;$ORIGIN 0/25.4.168.192.in-addr.arpa.
$INCLUDE named.soa
   ...
1  IN PTR one.test.com.
2  IN PTR two.test.com.
3  IN PTR tre.test.com.




-------------------------------------------------
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
=================================================





-----Original Message-----
From: bind-users-bounce at isc.org [mailto:bind-users-bounce at isc.org]On
Behalf Of esiewick at my-deja.com
Sent: Sunday, February 04, 2001 3:31 PM
To: comp-protocols-dns-bind at moderators.isc.org
Subject: Re: BIND 8.2.3 Classless Example


In article <95bboq$38a at pub3.rc.vix.com>,
  Mark.Andrews at nominum.com wrote:

> Looking at your web page you are obviously confused.

Nope.

Classless delegation is independent of the number of
DNs.  You might have one DN and several non-contiguous
7-bit subnets; there are other possibilities. The
example at <http://www.digipro.com/Papers/bind-8.2.3.shtml>
is meant to provide a minimal skeleton for DNS admins
trying to deal with certain of the syslog errors
related to the ordering of CNAMEs after PTR records.

I had to restructure DNS config files between 8.2.2
and 8.2.3 where CNAME and PTR records were stored
in per DN files, where collections of records
resulted in dysfunctional tables like:

x.x.x.0:
CNAME
PTR

x.x.x.128:
CNAME
PTR

Under 8.2.2, this sort of thing didn't cause zones
to be rejected.

If you have comments, send email.  I don't spend
a whole lot of time in newsgroups.

Edward Siewick
DigiPro Digital Productions
Arlington, Virginia, USA



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