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SMTP Operational Experience in Mixed IPv4/v6 Environments (RFC3974)

IP.com Disclosure Number: IPCOM000034107D
Original Publication Date: 2005-Jan-01
Included in the Prior Art Database: 2005-Jan-15
Document File: 11 page(s) / 23K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Nakamura: AUTHOR [+2]

Abstract

This document discusses SMTP operational experiences in IPv4/v6 dual stack environments. As IPv6-capable SMTP servers are deployed, it has become apparent that certain configurations of MX records are necessary for stable dual-stack (IPv4 and IPv6) SMTP operation. This document clarifies the existing problems in the transition period between IPv4 SMTP and IPv6 SMTP. It also defines operational requirements for stable IPv4/v6 SMTP operation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 12% of the total text.

Network Working Group                                        M. Nakamura

Request for Comments: 3974                              Kyoto University

Category: Informational                                        J. Hagino

                                                 IIJ Research Laboratory

                                                            January 2005

       SMTP Operational Experience in Mixed IPv4/v6 Environments

Status of This Memo

   This memo provides information for the Internet community.  It does

   not specify an Internet standard of any kind.  Distribution of this

   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

IESG Note:

   The content of this RFC was at one time considered by the IETF, and

   therefore it may resemble a current IETF work in progress or a

   published IETF work.  This RFC is not a candidate for any level of

   Internet Standard.  The IETF disclaims any knowledge of the fitness

   of this RFC for any purpose, and in particular notes that the

   decision to publish is not based on IETF review for such things as

   security, congestion control, or inappropriate interaction with

   deployed protocols.  The RFC Editor has chosen to publish this

   document at its discretion.  Readers of this RFC should exercise

   caution in evaluating its value for implementation and deployment.

   This document contains a specific interpretation of the applicability

   of the MX processing algorithm in RFC 2821, Section 5, to dual-stack

   environments.  Implementors are cautioned that they must reference

   RFC 2821 for the full algorithm; this document is not to be

   considered a full restatement of RFC 2821, and, in case of ambiguity,

   RFC 2821 is authoritative.

Abstract

   This document discusses SMTP operational experiences in IPv4/v6 dual

   stack environments.  As IPv6-capable SMTP servers are deployed, it

   has become apparent that certain configurations of MX records are

   necessary for stable dual-stack (IPv4 and IPv6) SMTP operation.  This

   document clarifies the existing problems in the transition period

   between IPv4 SMTP and IPv6 SMTP.  It also defines operational

   requirements for stable IPv4/v6 SMTP operation.

Nakamura & Hagino            Informational                      [Page 1]

RFC 3974            SMTP in Dual Stack Environments         January 2005

   This document does not define any new protocol.

1.  Introduction

   Delivery of mail messages to the final mail drop is not always done

   by direct IP communication between the submitter and final receiver,

   and there may be some intermediate hosts that relay the messa...