Reverse DNS Dig returning PTR results only with trace option

[Mark Andrews]

In message <4AF9DFBA.6040501 at cyzap.com>, Raj Adhikari writes:
> Thanks Chris for the reply.
> Actually, let me put my question the other way.
> How can one delegate the classless subnet to other DNS?
> Actually, one of our ISP could not delegate classless subnet to our
> server ns1.cyzap.net. I am trying to help them in delegating the
> classless subnet to us. So this scenario is simulating our ISP and us. I
> was just testing with one of our other subnets checking if delegation
> will work. Unfortunately, we both are using windows DNS. Windows just
> have RFC 2317 way on configuring the delegation on it KB article using
> CNAME, which I think has lots of problems. But I am following this BIND
> way for delegation. I think, in windows the DNS configuration is more or
> less similar to BIND.
> 
> In this scenario, lets say ns1.cyzap.net is my ISP and
> ns1.monetreesystems.com is us. ns1.cyzap.net owns 63.254.134.0/24 and
> ns1.moneytreesystems.com take a subnet 134.224/28 from them. So isn't
> there a way for ns1.cyzap.net to delegate the subnet to
> ns1.moneytreesystems.com? Do ns1.cyzap.net again have to talk to their
> upper ISP to delegate directly to us? What if upper ISP also need to ask
> their upper tier ISP. It seems I am lacking some basic concept here
> about the owner of the subnet. If a true owner delegates the subnet to
> its client ISP, can't this ISP again delegate the classless subnet agin
> to its client ISP?
> 
> Thank you,
> Rajendra Adhikari
 
You tell your ISP where the delegation needs to point.  If your ISP
controls the exclosing name in the DNS namespace they update it
there or they pass on your request to where they got their address
space from.  Repeat until the delegation is added to the parent
zone.

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org