Glue In DNS Referral Responses Is Not Optional

Document Type Replaced Internet-Draft (dnsop WG)
Last updated 2020-06-03 (latest revision 2020-04-16)
Replaced by draft-ietf-dnsop-glue-is-not-optional
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized (tools) htmlized bibtex
Stream WG state Adopted by a WG
Document shepherd No shepherd assigned
IESG IESG state Replaced by draft-ietf-dnsop-glue-is-not-optional
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The DNS uses glue records to allow iterative clients to find the addresses of nameservers that live within the delegated zone. Glue records are expected to be returned as part of a referral and if they cannot be fitted into the UDP response, TC=1 MUST be set to inform the client that the response is incomplete and that TCP SHOULD be used to retrieve the full response.


Mark Andrews (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)