[dns-operations] [Ext] Verisign TLDs, some other servers may trim critical glue from very large referrals

[Tony Finch]

Edward Lewis <edward.lewis at icann.org> wrote:

> This is an interesting protocol-implementation question.  What's being
> returned by the server in this case is reasonable (according to the
> protocol) but evidently less than useful.

In the terminology of RFC 4472, in-bailiwick glue is "critical" additional
data, which must either be included in a response or the TC bit must be set.
There's a really good discussion of the issues in appendix B.

https://tools.ietf.org/html/rfc4472#appendix-B

Tony.
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