[Enum] I-D ACTION:draft-ietf-enum-edns0-00.txt

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This draft is a work item of the Telephone Number Mapping Working Group of the IETF.

	Title		: ENUM Requirement for EDNS0 Support
	Author(s)	: L. Conroy, J. Reid
	Filename	: draft-ietf-enum-edns0-00.txt
	Pages		: 16
	Date		: 2006-9-6
	
   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.



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