[dns-operations] /24 Reverse DNS delegation using the IP Address 4th octet?

[bmanning at vacation.karoshi.com]

 they are giving you the type of delegation usually reserved for space
 less than a /24.  it will work, but its more effort on their part... 
 one might assume they think your going to give back a /25 or so and not
 use the whole /24.

--bill


On Tue, Mar 16, 2010 at 05:17:01PM -0400, Chuck Anderson wrote:
> Ok, so I asked for a reverse DNS delegation of a /24.  Let's call it 
> "10.1.2.0/24" for the sake of discussion.  I was expecting to get the 
> following in their (parent) zone:
> 
> 2.1.10.in-addr.arpa. 86400	IN	NS	my-master-1.example.com.
> 2.1.10.in-addr.arpa. 86400	IN	NS	my-master-2.example.com.
> 
> Instead, what they gave me was this:
> 
> 0.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-1.example.com.
> 0.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-2.example.com.
> 
> 1.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-1.example.com.
> 1.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-2.example.com.
> 
> 2.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-1.example.com.
> 2.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-2.example.com.
> 
> 3.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-1.example.com.
> 3.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-2.example.com.
> 
> ...
> 
> 255.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-1.example.com.
> 255.2.1.10.in-addr.arpa. 86400	IN	NS	my-master-2.example.com.
> 
> Is that workable?  It seems silly to me.  Can I still just set up a 
> single zone file like so?
> 
> $TTL 86400
> $ORIGIN 2.1.10.in-addr.arpa.
> @       IN      SOA     my-master-1.example.com. hostmaster.example.com. ( 7 3600 600 3600000 86400 )
> 
> @	IN	NS	my-master-1.example.com.
> 	IN	NS	my-master-2.example.com.
> 
> 0	IN	A	zero.example.com.
> 1	IN	A	one.example.com.
> 2	IN	A	two.example.com.
> ...
> 
> etc.
> 
> My gut feeling is that this isn't going to work and that they really 
> need to delegate 2.1.10.in-addr.arpa directly, correct?
> 
> -- 
> - Chuck (366 Days until IPv4 depletion: http://ipv4depletion.com/)
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