dname reverse delegation

[Matus UHLAR - fantomas]

On 14.10.15 10:11, Paul A wrote:
>Niall my problem is the name server that delegated the reserve does look up the record correctly.
>
>I have this in the zone,
>
>                        DNAME 0/24
>;;
>;;; delegate to server
>;;
>0/24    NS      ns.someserver.com
>;;
>
>
>At the ns.someserver.com the looks ups work with no problems. However at the main name server the PTR look up does not work.
>Not sure what im missing.

You have been already advised to avoid the ".0/24." NONSENSE.  You can
easily delegate x.x.x.IN-ADDR.ARPA without putting useless (and as you
report, problematic) subdomain ".0/24."  there...

>;; ANSWER SECTION:
>x.x.x.in-addr.arpa.   172800  IN      DNAME   0/24.x.x.x.IN-ADDR.ARPA.
>2.x.x.x.in-addr.arpa. 172800  IN      CNAME   2.0/24.x.x.x.IN-ADDR.ARPA.
>2.0/24.x.x.x.IN-ADDR.ARPA. 172800 IN  CNAME   2.0/24.0/24.x.x.x.IN-ADDR.ARPA.
>2.0/24.0/24.x.x.x.IN-ADDR.ARPA. 172800 IN CNAME 2.0/24.0/24.0/24.x.x.x.IN-ADDR.ARPA.
>2.0/24.0/24.0/24.x.x.x.IN-ADDR.ARPA. 172800 IN CNAME 2.0/24.0/24.0/24.0/24.x.x.x.IN-ADDR...........
>
>But the looking up the record on ns1.someserver.com works fine.
>
>;; ANSWER SECTION:
>13.7.69.in-addr.arpa.   172229  IN      DNAME   0/24.x.x.69.IN-ADDR.ARPA.
>2.13.7.69.in-addr.arpa. 172229  IN      CNAME   2.0/24.x.x.69.IN-ADDR.ARPA.
>2.0/24.13.7.69.IN-ADDR.ARPA. 172800 IN  PTR     x-x-x-x.rev.XXX.com.


>On Tue, 13 Oct 2015 21:40:30 +0100,
>Paul A wrote:
>>
>> I have a few /24 that I want to delegate using DNAME.
>
>  Are you expecting to save yourself trouble by doing so?
>  If not, you should probably reconsider.
[...]
>  Don't be distracted by RFC2317.  It describes the trickery you need
>  when you're dealing with a longer prefix (fewer addresses) than a
>  /24.  If you have "a few /24", you can deal with them without
>  needing any of that.

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