Extension Mechanisms for DNS (EDNS )
RFC 6891, “Extension Mechanisms for DNS (EDNS )”, is an Internet Standard document published in April 2013 by J. Damas, M. Graff, P. Vixie. It obsoletes RFC 2671, RFC 2673. The canonical text is published by the RFC Editor.
Abstract
The Domain Name System's wire protocol includes a number of fixed fields whose range has been or soon will be exhausted and does not allow requestors to advertise their capabilities to responders. This document describes backward-compatible mechanisms for allowing the protocol to grow.
This document updates the Extension Mechanisms for DNS (EDNS(0)) specification (and obsoletes RFC 2671) based on feedback from deployment experience in several implementations. It also obsoletes RFC 2673 ("Binary Labels in the Domain Name System") and adds considerations on the use of extended labels in the DNS.
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
The canonical text of RFC 6891 is hosted at rfc-editor.org. Available in TXT,HTML.
- RFC 6890 Special-Purpose IP Address Registries
- RFC 6892 The 'describes' Link Relation Type
- RFC 6889 Analysis of Stateful 64 Translation
- RFC 6893 A Uniform Resource Name Namespace for the Open IPTV Forum
- RFC 6888 Common Requirements for Carrier-Grade NATs
- RFC 6894 Methodology for Benchmarking MPLS Traffic Engineered Fast Reroute Protection
- RFC 6887 Port Control Protocol
- RFC 6895 Domain Name System IANA Considerations