Extension Mechanisms for DNS (EDNS0)

Document Type Replaced Internet-Draft (individual)
Authors Paul Vixie  , Michael Graff 
Last updated 2009-09-28 (latest revision 2009-07-13)
Replaced by RFC 6891
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Expired & archived
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Stream Stream state (No stream defined)
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IESG IESG state Replaced by draft-ietf-dnsext-rfc2671bis-edns0
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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 (vixie@isc.org)
Michael Graff (mgraff@isc.org)

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