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Extension Mechanisms for DNS (EDNS0)

Document type: Replaced Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2009-09-28 (latest revision 2009-07-13)
Intended RFC status: Unknown
Other versions: (expired, archived): plain text, pdf, html

Stream State:No stream defined
Document shepherd: No shepherd assigned

IESG State: Replaced by draft-ietf-dnsext-rfc2671bis-edns0
Responsible AD: (None)
Send notices to: No addresses provided

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


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 clients to advertise their capabilities to servers. This document describes backward compatible mechanisms for allowing the protocol to grow. This document is a starting point to update the EDNS0 RFC after 10 years of operational experience.


Paul Vixie <>
Michael Graff <>

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