[dns-operations] Weirdness with glue for old (gone) DNS servers

[Mark Andrews]

In message <5373E905.8070308 at hireahit.com>, Dave Warren writes:
> On 2014-05-14 14:18, Mark Andrews wrote:
> > Then why does't the registry remove all the records below a delegation
> > and any records that refer to them from the published zone when a
> > delegation is removed?  Rinse, lather, repeat for any delegations
> > that now no longer exist in the published zone.  The zone will be
> > re-instated or the NS records will be updated to refer to nameservers
> > in a different zone.
> 
> I *think* the concern is that the registry might be reluctant to modify 
> the configuration for one zone due to a change made on another, 
> administratively unrelated, zone.

Except they *are* administratively related in the DNS sense.
 
> What if the registry did rip these entries out and the NS records were 
> later restored, what would happen to the modified zones that now have 
> only a subset of their NS records?

You could restore the chain or just do what you do for cross registry
issues and pull the NS records after notifying the contacts of the
intent to remove the records and a short delay (days).  It's then
up to the registrant to make the delegation good once the NS records
are removed.  For those registries which can't contact the registant
directly they use the registrar to forward the notice.

> How about when a domain under .com disappears, how would .org know to 
> change/remove the delegation.

Then the registrar removes the NS records and contacts the listed
contacts for the delegation.

> Don't get me wrong, I'd love to see these issues solved, but I don't 
> actually see a good fix that doesn't have potential to break things when 
> edge cases do occur.
> 
> -- 
> Dave Warren
> http://www.hireahit.com/
> http://ca.linkedin.com/in/davejwarren
> 
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org