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Checking references for intended status: Informational ---------------------------------------------------------------------------- == Outdated reference: A later version (-14) exists of draft-arkko-ipv6-transition-guidelines-08 == Outdated reference: A later version (-11) exists of draft-ietf-6man-node-req-bis-06 -- Obsolete informational reference (is this intentional?): RFC 2629 (Obsoleted by RFC 7749) -- Obsolete informational reference (is this intentional?): RFC 4294 (Obsoleted by RFC 6434) -- Obsolete informational reference (is this intentional?): RFC 6036 (Obsoleted by RFC 9386) Summary: 0 errors (**), 0 flaws (~~), 3 warnings (==), 4 comments (--). Run idnits with the --verbose option for more detailed information about the items above. -------------------------------------------------------------------------------- 2 V6OPS B. Carpenter 3 Internet-Draft Univ. of Auckland 4 Intended status: Informational S. Jiang 5 Expires: June 4, 2011 Huawei Technologies Co., Ltd 6 V. Kuarsingh 7 Rogers Communications 8 December 1, 2010 10 Framework for IP Version Transition Scenarios 11 draft-ietf-v6ops-v4v6tran-framework-00 13 Abstract 15 This document sets out a framework for the presentation of scenarios 16 and recommendations for a variety of approaches to the transition 17 from IPv4 to IPv6, given the necessity for a long period of co- 18 existence of the two protocols. 20 Status of this Memo 22 This Internet-Draft is submitted in full conformance with the 23 provisions of BCP 78 and BCP 79. 25 Internet-Drafts are working documents of the Internet Engineering 26 Task Force (IETF). Note that other groups may also distribute 27 working documents as Internet-Drafts. The list of current Internet- 28 Drafts is at http://datatracker.ietf.org/drafts/current/. 30 Internet-Drafts are draft documents valid for a maximum of six months 31 and may be updated, replaced, or obsoleted by other documents at any 32 time. It is inappropriate to use Internet-Drafts as reference 33 material or to cite them other than as "work in progress." 35 This Internet-Draft will expire on June 4, 2011. 37 Copyright Notice 39 Copyright (c) 2010 IETF Trust and the persons identified as the 40 document authors. All rights reserved. 42 This document is subject to BCP 78 and the IETF Trust's Legal 43 Provisions Relating to IETF Documents 44 (http://trustee.ietf.org/license-info) in effect on the date of 45 publication of this document. Please review these documents 46 carefully, as they describe your rights and restrictions with respect 47 to this document. Code Components extracted from this document must 48 include Simplified BSD License text as described in Section 4.e of 49 the Trust Legal Provisions and are provided without warranty as 50 described in the Simplified BSD License. 52 Table of Contents 54 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 55 2. Document Topics . . . . . . . . . . . . . . . . . . . . . . . . 4 56 3. Security Considerations . . . . . . . . . . . . . . . . . . . . 5 57 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 58 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 5 59 6. Change log . . . . . . . . . . . . . . . . . . . . . . . . . . 5 60 7. Informative References . . . . . . . . . . . . . . . . . . . . 6 61 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 63 1. Introduction 65 This document sets out a framework for the presentation of scenarios 66 and recommendations for a variety of approaches to the transition 67 from IPv4 to IPv6, given the necessity for a long period of co- 68 existence of the two protocols. A general "call to arms" for 69 transition is found in [RFC5211], and a recommendation for four 70 principal scenarios is given in 71 [I-D.arkko-ipv6-transition-guidelines]. A report on experience and 72 plans of various Internet Service Providers (ISPs) is given in 73 [RFC6036]. However, it is clear that operators require more detailed 74 technical recommendations than are available so far. A companion 75 document [reference TBD] provides a technical problem statement. 76 Unfortunately, the number of different combinations of existing IPv4 77 deployment models, customer profiles and requirements, and possible 78 coexistence and transition models, is enormous, so it is quite 79 impracticable to produce either a set of recommendations for each 80 case, or a recommended "one size fits all" model. That is why this 81 document proposes a set of topics or dimensions, as a framework for a 82 reasonable number of recommendation documents. 84 The reader is assumed to be familiar with IPv6. The IETF's view of 85 core IPv6 requirements is to be found in [RFC4294] (currently being 86 updated as [I-D.ietf-6man-node-req-bis]). However, this does not 87 give a complete view of mechanisms an ISP may need to deploy, since 88 it considers the requirements for an individual node, not for a 89 network or service infrastructure as a whole. 91 [RFC4029] discussed scenarios for introducing IPv6 into ISP networks, 92 as the problem was viewed some years ago. Its end goal was simply a 93 dual-stack ISP backbone. Today's view is that this is insufficient, 94 as it does not allow for prolonged interworking between IPv6-only and 95 legacy (IPv4-only) hosts. Indeed, the end goal today might be an 96 IPv6-only ISP backbone, with some form of legacy IPv4 support 97 [I-D.arkko-ipv6-transition-guidelines]. 99 Although the basic IPv6 standards are stable, considerable work 100 continues in several IETF working groups, on issues such as 101 multihoming, tunneling, and IP layer interworking between IPv6-only 102 and IPv4-only hosts. However, operators faced with IPv4 address 103 exhaustion in the coming few years need immediate guidance. These 104 operators cannot avoid the need for general skills acquisition, or 105 the need to write their own detailed deployment plan, but they also 106 need guidance for generic scenarios similar to their actual 107 situation. They cannot obtain such guidance from individual protocol 108 specifications developed by the IETF, so there is a need for 109 additional documents. 111 2. Document Topics 113 On the assumption that a series of documents are produced describing 114 and recommending transition scenarios, there are two basic 115 conditions: 116 1. The documents will not be primary protocol specifications, 117 because those are the outcome of IETF working groups chartered to 118 work on specific protocol mechanisms. 119 2. The documents are addressed to service providers who have taken 120 the decision to support IPv6, have acquired basic knowledge and 121 skills, have determined how they will obtain upstream IPv6 122 connectivity, and are ready to write their operational plan for 123 transition. 125 The documents should each cover some or all of the following aspects 126 or dimensions: 127 o For the convenience of readers, each document should briefly 128 describe its network model in the Abstract (or Introduction) for 129 quick reference. 130 o The documents should explain how certain technology components fit 131 together in a given transition and co-existence scenario. 132 o They will present major generic network models, and their subsets, 133 which exist (or are firmly planned) today, including network 134 topologies and/or architectures. 135 o They should specify their scope: the range of technologies that 136 they do or do not apply to (e.g. specific access network 137 technologies, core network technologies and topologies, mobile vs 138 fixed hosts, business vs private customers, etc.). 139 o They should develop analysis criteria on how to recognize 140 appropriate transition technologies for existing provider networks 141 within their scope. This should include information related to 142 deployed protocols and functions which may assist or hinder 143 various transition technologies from being deployed. 144 o If multiple transition technologies are needed for provider 145 environments where access networks differ and have various 146 capabilities, the documents should show how these technologies can 147 be deployed simultaneously. 148 o They should describe how multiple technologies can co-exist, if 149 necessary, during all stages of migration (e.g., moving from IPv4 150 Only to Dual-Stack to DS-Lite to NAT64). 151 o They should cover considerations for legacy operation while moving 152 to IPv6 and its transition technologies. Many operators will have 153 large quantities of IPv4-only equipment which cannot feasibly be 154 upgraded until the end of its economic life, or which is under 155 customer control. 156 o They should cover considerations which apply when retro-fitting 157 various technologies to existing networks. Included in this would 158 be impacts on ancillary protocols, routing platforms/systems, 159 security policies, provisioning systems, network services (i.e. 160 DHCP, DNS etc), law enforcement procedures and more. 161 o They should quantify scaling characteristics of deployment modes 162 for each technology model and intersections during co-existence 163 (e.g. if some of the Network is DS-Lite and some is classical Dual 164 Stack; peak load on NAT64; etc.). 165 o The documents should include security considerations for their 166 specific transition scenario(s). 168 A desirable outcome would be a set of Best Current Practice (BCP) or 169 advisory (Informational) documents for a range of generic deployment 170 models and how they fit into a network, including key services such 171 as subscriber authentication, DHCP, and DNS. However, it must not be 172 forgotten that every service provider is different and such documents 173 can never replace specific deployment plans drawn up by each 174 individual service provider. 176 3. Security Considerations 178 Service providers will insist on having security for IPv6 services, 179 and for all transition technologies, that is at least as good as for 180 IPv4 services in all respects. Particular attention must be paid to 181 security exposures that are specific to transition and coexistence 182 mechanisms. Thus, all recommendations for transition scenarios must 183 include any security aspects that are specific to that scenario. 185 4. IANA Considerations 187 This document makes no request of the IANA. 189 5. Acknowledgements 191 Useful comments and contributions were made by ... and others. 193 This document was produced using the xml2rfc tool [RFC2629]. 195 6. Change log 197 draft-ietf-v6ops-v4v6tran-framework-00: adopted by WG at IETF 79, 198 2010-12-01 200 draft-carpenter-v4v6tran-framework-00: original version, 2010-08-18 202 7. Informative References 204 [I-D.arkko-ipv6-transition-guidelines] 205 Arkko, J. and F. Baker, "Guidelines for Using IPv6 206 Transition Mechanisms during IPv6 Deployment", 207 draft-arkko-ipv6-transition-guidelines-08 (work in 208 progress), November 2010. 210 [I-D.ietf-6man-node-req-bis] 211 Jankiewicz, E., Loughney, J., and T. Narten, "IPv6 Node 212 Requirements RFC 4294-bis", 213 draft-ietf-6man-node-req-bis-06 (work in progress), 214 October 2010. 216 [RFC2629] Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, 217 June 1999. 219 [RFC4029] Lind, M., Ksinant, V., Park, S., Baudot, A., and P. 220 Savola, "Scenarios and Analysis for Introducing IPv6 into 221 ISP Networks", RFC 4029, March 2005. 223 [RFC4294] Loughney, J., "IPv6 Node Requirements", RFC 4294, 224 April 2006. 226 [RFC5211] Curran, J., "An Internet Transition Plan", RFC 5211, 227 July 2008. 229 [RFC6036] Carpenter, B. and S. Jiang, "Emerging Service Provider 230 Scenarios for IPv6 Deployment", RFC 6036, October 2010. 232 Authors' Addresses 234 Brian Carpenter 235 Department of Computer Science 236 University of Auckland 237 PB 92019 238 Auckland, 1142 239 New Zealand 241 Email: brian.e.carpenter@gmail.com 242 Sheng Jiang 243 Huawei Technologies Co., Ltd 244 KuiKe Building, No.9 Xinxi Rd., 245 Shang-Di Information Industry Base, Hai-Dian District, Beijing 246 P.R. China 248 Email: shengjiang@huawei.com 250 Victor Kuarsingh 251 Rogers Communications 252 Canada 254 Email: Victor.Kuarsingh@rci.rogers.com