A Proposed Enhancement to the EDNS0 Version Mechanism

Document Type Expired Internet-Draft (dnsext WG)
Authors Rob Austein  , Harald Alvestrand 
Last updated 2000-11-17
Stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Expired & archived
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Stream WG state WG Document
Document shepherd No shepherd assigned
IESG IESG state Expired
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This Internet-Draft is no longer active.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


EDNS0 [EDNS0] specifies a general framework for extending the packet format used by the Domain Name System protocols. The framework includes a simple version numbering scheme to allow the parties in a DNS protocol exchange to determine which extension features the other party understands. While having the advantage of simplicity, the version numbering scheme as specified has drawbacks: - It provides no way to deprecate a protocol feature; - It provides no way to deploy experimental protocol features. This note proposes to replace the monolithic version numbering mechanism with a mechanism for listing an explicit set of protocol features that a particular implementation supports. We retain version numbering as a way of abbreviating the feature sets that we expect to see in common use.


Rob Austein (sra@hactrn.net)
Harald Alvestrand (harald@alvestrand.no)

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