Delegating in-addr.arpa for subnetted address space

[Derek Atkins]

Michael Bilow <mike at bilow.com> writes:

> 	$ORIGIN 3.2.1.in-addr.arpa.
> 	* * *
> 	16	NS	ns.thorin.com.
> 	17	NS	ns.thorin.com.
[snip]

Another way of doing this is to you CNAME records have have a
delegrated subdomain.  For example:

	$ORIGIN 3.2.1.in-addr.arpa.
	* * *
	16-28	NS	ns.thorin.com.
	16	CNAME	16.16-28
	17	CNAME	17.16-28
	...

Then you have another zone (on thorin) that says:

	$ORIGIN 16-28.3.2.1.in-addr.arpa.
	* * *
	16	PTR	...
	17	PTR	...
	...

And yes, this is legal to do, and is one of the recommended methods
for CIDR in-addr.

-derek
-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available
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