ENUM Requirement for EDNS0 Support
draft-ietf-enum-edns0-00

Approval announcement
Draft of message to be sent after approval:

Announcement

From: The IESG <iesg-secretary@ietf.org>
To: IETF-Announce <ietf-announce@ietf.org>
Cc: Internet Architecture Board <iab@iab.org>,
    RFC Editor <rfc-editor@rfc-editor.org>, 
    enum mailing list <enum@ietf.org>, 
    enum chair <enum-chairs@tools.ietf.org>
Subject: Protocol Action: 'ENUM Requirement for EDNS0 Support' 
         to BCP 

The IESG has approved the following document:

- 'ENUM Requirement for EDNS0 Support '
   <draft-ietf-enum-edns0-00.txt> as a BCP

This document is the product of the Telephone Number Mapping Working 
Group. 

The IESG contact persons are Cullen Jennings and Robert Sparks.

A URL of this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-enum-edns0-00.txt

Ballot Text

Technical Summary:

  Support for EDNS0 (Extension Mechanisms for DNS) is mandated in this
  document for DNS entities querying for or serving NAPTR records.  In
  general those entities will be supporting ENUM resolution.  This
  requirement is needed because DNS responses to ENUM-related queries
  generally return large RRSets.  Without EDNS0 support these lookups
  would result in truncated responses and repeated queries over TCP
  transport.  That has a severe impact on DNS server load and on the
  latency of those queries.

  This document adds an operational requirement to use of the protocol
  standardised in RFC 3761.


Working Group Summary:

No controversial issues with this document.


Protocol Quality:

Most DNS server software already supports EDNS0 and tries to use this
by default. Vendors will not provide EDNS0 support in ENUM-aware
applications unless there is an IETF document which mandates this.

Alexander Mayrhofer, Peter Koch and Lars-Johan Liman had a thorough
review and provided feedback which has been incorporated into the
document. No substantive issues remain. NITS review by Alexander 
Mayrhofer.


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