[Community-Discuss] Yet more data base problems/inconsistancies

[Ronald F. Guilmette]

In message <20201130013319.xddpolsgaynzlza6 at benm-laptop>, 
Ben Maddison <benm at workonline.africa> wrote:


>This seems fairly clear, to me at least, that having delegations at the

>same authoritative nameserver for a subdomain and a

>subdomain-of-a-subdomain is problematic.


I don't see that.


>Consider:

>ns-a delegates foo.example.com to ns-b

>           and bar.foo.example.com to ns-c

>ns-b delegates bar.foo.example.com to ns-d

>

>Who is authoritative for host.bar.foo.example.com?


My understanding is that the delegation of DNS authority works a lot
like routing, i.e. in any case where two or more DNS authority delegations
-could- theoretically be applicable, the most specific DNS delegation wins.

Of course, if there are ties, where each of two or more delegations are
equally specific, then that's problematic.  But I don't think we are
discussing such cases at the moment.

I freely admit that I may perhaps not be on entirely solid ground when
it comes to this "most specific wins" rule, but I do believe that's how
DNS works.  If I am wrong about that, I will be happy to be corrected.


Regards,
rfg