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NAT64 Deployment Options and Experience
RFC 7269

Internet Engineering Task Force (IETF)                           G. Chen
Request for Comments: 7269                                        Z. Cao
Category: Informational                                     China Mobile
ISSN: 2070-1721                                                   C. Xie
                                                           China Telecom
                                                                D. Binet
                                                   France Telecom-Orange
                                                               June 2014

                NAT64 Deployment Options and Experience

Abstract

   This document summarizes NAT64 function deployment scenarios and
   operational experience.  Both NAT64 Carrier-Grade NAT (NAT64-CGN) and
   NAT64 server Front End (NAT64-FE) are considered in this document.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7269.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Chen, et al.                  Informational                     [Page 1]
RFC 7269                    NAT64 Experience                   June 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  NAT64 Networking Experience . . . . . . . . . . . . . . . . .   4
     3.1.  NAT64-CGN Consideration . . . . . . . . . . . . . . . . .   4
       3.1.1.  NAT64-CGN Usages  . . . . . . . . . . . . . . . . . .   4
       3.1.2.  DNS64 Deployment  . . . . . . . . . . . . . . . . . .   4
       3.1.3.  NAT64 Placement . . . . . . . . . . . . . . . . . . .   5
       3.1.4.  Coexistence of NAT64 and NAT44  . . . . . . . . . . .   5
     3.2.  NAT64-FE Consideration  . . . . . . . . . . . . . . . . .   6
   4.  High Availability . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Redundancy Design . . . . . . . . . . . . . . . . . . . .   7
     4.2.  Load Balancing  . . . . . . . . . . . . . . . . . . . . .   9
   5.  Source-Address Transparency . . . . . . . . . . . . . . . . .   9
     5.1.  Traceability  . . . . . . . . . . . . . . . . . . . . . .   9
     5.2.  Geolocation . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Quality of Experience . . . . . . . . . . . . . . . . . . . .  11
     6.1.  Service Reachability  . . . . . . . . . . . . . . . . . .  11
     6.2.  Resource Reservation  . . . . . . . . . . . . . . . . . .  13
   7.  MTU Considerations  . . . . . . . . . . . . . . . . . . . . .  13
   8.  ULA Usages  . . . . . . . . . . . . . . . . . . . . . . . . .  14
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  16
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     12.2.  Informative References . . . . . . . . . . . . . . . . .  18
   Appendix A.  Test Results for Application Behavior  . . . . . . .  21

1.  Introduction

   IPv6 is the only sustainable solution for numbering nodes on the
   Internet due to the IPv4 depletion.  Network operators have to deploy
   IPv6-only networks in order to meet the needs of the expanding
   Internet without available IPv4 addresses.

   Single-stack IPv6 network deployment can simplify network
   provisioning; some justification was provided in 464XLAT [RFC6877].
   IPv6-only connectivity confers some benefits to mobile operators as

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