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

Tony Finch dot at dotat.at
Fri Jan 4 16:23:26 UTC 2019

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.


f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Mull of Galloway to Mull of Kintyre including the Firth of Clyde and North
Channel: Variable, mainly southwesterly, 3 or 4. Smooth or slight. Fair. Good.

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