delegation NS records

[Bob Harold]

On Thu, Jul 13, 2017 at 3:33 PM, <bind at zq3q.org> wrote:

> Hi Niall:
>
> On Tue 7/11/17 22:56 +0100 "Niall O'Reilly" wrote:
> > On 11 Jul 2017, at 22:01, bind at zq3q.org wrote:
> >
> > > As I wrote to Niall (msg dated 11 Jul 2017 15:04:32 -0500) ,
> >
> > That hasn't reached me yet.
> >
> > > I **do not** have a NS record for each of my two
> > > nameservers, in the domain zone that the respective nameserver itself
> is in.
> > > That is a mistake, I need to fix, right?
> >
> > Short answer: just no.
> >
> > Long answer: not unless either of your servers is providing name service
> for
> > the zone that the nameserver itself is in.  As I understand from your
> > original message, this is not the case, so just no.
>
> Thanks much!
>
> --
> Check my comprehension:
>
> So, **delegation** NS records are only needed in the zone which has an
> $ORIGIN,
> which is 1 level up from the $ORIGIN in the zone that contains the
> nameserver SOA, and
> authority NS records in.  If this zone with delegation NS records is a
> subdomain
> of a TLD, then one adds these delegation NS records by using the
> registrar's
> interface to the TLD registry.
>
> --
> regards,
> Tom
>

Let's illustrate one NS record, for each of the cases:
(I think your case is #2)

1. Name server name inside the domain itself

example.com zone:
example.com IN NS ns.example.com
ns.example.com IN A x.x.x.x

the TLD com would have (entered by the registrar)
example.com IN  NS ns.example.com
ns.example.com IN A x.x.x.x   (this is a "glue" record)


2. Name server name in another domain:

example.com zone:
example.com IN NS ns.otherdomain.com

TLD com zone:
example.com IN NS ns.otherdomain.com
(no glue record)

otherdomain.com zone:
ns.otherdomain.com IN A x.x.x.x


3. Sibling domains with name servers for each other: (should be avoided?)

example.com zone:
example.com IN NS ns.otherdomain.com
ns.example.com IN A x.x.x.x

otherdomain.com zone:
otherdomain.com IN  NS ns.example.com
ns.otherdomain.com IN A x.x.x.x

TLD com zone:
example.com IN NS ns.otherdomain.com
ns.example.com IN A x.x.x.x  (glue record?)
ns.otherdomain.com IN A x.x.x.x (glue record?)

-- 
Bob Harold
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.isc.org/pipermail/bind-users/attachments/20170713/70c27b17/attachment.html>