[dns-operations] is glue expected in this case?

[Tony Finch]

Veaceslav Revutchi <slavarevutchi at gmail.com> wrote:
>
> I would expect this glue to be present at the tld if
> ns-1281.awsdns-32.org was one of the name servers for awsdns-32.org
> which is not the case. Is there another reason for this record to be
> kept in the org zone?

My understanding is that most (not all) registries use a data model with
separate domain and host objects, and these registries require a host
object to exist for any NS record that is a child of any of the TLDs in
the registry. [.com, .net, and .edu share a registry, for example] Whether
a host object has to have addresses is a bit unclear to me: the minimal
requirement from the DNS is that an NS target should have glue if it is a
child of the NS owner, but registries can require addresses in more
situations than the DNS needs. There's also some complication about
whether a host object in the registry is actually published in the zone
(for instance glue should be omitted if the parent domain is cancelled so
it isn't promoted to authoritative data, but there may be other more
obscure cases).

Tony.
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