Pros and Cons of IPv6 Transition Technologies for IPv4aaS
draft-lmhp-v6ops-transition-comparison-05

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Internet Engineering Task Force                                G. Lencse
Internet-Draft                                                      BUTE
Intended status: Informational                         J. Palet Martinez
Expires: January 9, 2021                                The IPv6 Company
                                                               L. Howard
                                                                 Retevia
                                                            R. Patterson
                                                                  Sky UK
                                                               I. Farrer
                                                     Deutsche Telekom AG
                                                             Jul 8, 2020

       Pros and Cons of IPv6 Transition Technologies for IPv4aaS
               draft-lmhp-v6ops-transition-comparison-05

Abstract

   Several IPv6 transition technologies have been developed to provide
   customers with IPv4-as-a-Service (IPv4aaS) for ISPs with an IPv6-only
   access and/or core network.  All these technologies have their
   advantages and disadvantages, and depending on existing topology,
   skills, strategy and other preferences, one of these technologies may
   be the most appropriate solution for a network operator.

   This document examines the five most prominent IPv4aaS technologies
   considering a number of different aspects to provide network
   operators with an easy to use reference to assist in selecting the
   technology that best suits their needs.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 9, 2021.

Lencse, et al.           Expires January 9, 2021                [Page 1]
Internet-Draft    Pros and Cons of IPv4aaS Technologies         Jul 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   4
   2.  Overview of the Technologies  . . . . . . . . . . . . . . . .   4
     2.1.  464XLAT . . . . . . . . . . . . . . . . . . . . . . . . .   4
     2.2.  Dual-Stack Lite . . . . . . . . . . . . . . . . . . . . .   5
     2.3.  Lightweight 4over6  . . . . . . . . . . . . . . . . . . .   5
     2.4.  MAP-E . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     2.5.  MAP-T . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  High-level Architectures and their Consequences . . . . . . .   8
     3.1.  Service Provider Network Traversal  . . . . . . . . . . .   8
     3.2.  Network Address Translation . . . . . . . . . . . . . . .   9
     3.3.  IPv4 Address Sharing  . . . . . . . . . . . . . . . . . .  10
     3.4.  CE Provisioning Considerations  . . . . . . . . . . . . .  11
     3.5.  Support for Multicast . . . . . . . . . . . . . . . . . .  11
   4.  Detailed Analysis . . . . . . . . . . . . . . . . . . . . . .  11
     4.1.  Architectural Differences . . . . . . . . . . . . . . . .  11
       4.1.1.  Basic Comparison  . . . . . . . . . . . . . . . . . .  11
     4.2.  Tradeoff between Port Number Efficiency and Stateless
           Operation . . . . . . . . . . . . . . . . . . . . . . . .  12
     4.3.  Support for Public Server Operation . . . . . . . . . . .  14
     4.4.  Support and Implementations . . . . . . . . . . . . . . .  15
       4.4.1.  OS Support  . . . . . . . . . . . . . . . . . . . . .  15
       4.4.2.  Support in Cellular and Broadband Networks  . . . . .  16
       4.4.3.  Implementation Code Sizes . . . . . . . . . . . . . .  16
     4.5.  Typical Deployment and Traffic Volume Considerations  . .  16