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

[Jim Reid]

On 13 May 2014, at 22:51, Andrew Sullivan <ajs at anvilwalrusden.com> wrote:

> "Check every name using your nameservers at the parent side for glue before renumbering".

If only it was that simple Andrew. :-)

A delegation in TLD1 might point at a name in TLD2. So when the reference count for ns.foo.tld2 drops to zero, the registry deletes it from the DNS even though there's an NS record with RDATA for ns.foo.tld2 in TLD1.

ISTR this caused some pain when org was separated from the Verisign registry. I think at that time nameserver objects in the SRS were "shared" across all three TLDs.