DNS Glue Requirements in Referral Responses
RFC 9471, “DNS Glue Requirements in Referral Responses”, is a Proposed Standard document published in September 2023 by M. Andrews, S. Huque, P. Wouters, D. Wessels. It updates RFC 1034. The canonical text is published by the RFC Editor.
Abstract
The DNS uses glue records to allow iterative clients to find the addresses of name servers that are contained within a delegated zone. Authoritative servers are expected to return all available glue records for in-domain name servers in a referral response. If message size constraints prevent the inclusion of all glue records for in-domain name servers, the server must set the TC (Truncated) flag to inform the client that the response is incomplete and that the client should use another transport to retrieve the full response. This document updates RFC 1034 to clarify correct server behavior.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9471 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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