Deploying DualStack lite in IPv 6 only Network

Deploying Dual-Stack lite in IPv 6 -only Network IETF 76 Hiroshima softwire draft-boucadair-dslite-interco-v 4 v 6 -02 Pierre Lévis pierre. levis@orange-ftgroup. com 7 th November 2009

Introduction § I-D. boucadair-dslite-interco-v 4 v 6 § http: //tools. ietf. org/html/draft-boucadair-dslite-interco-v 4 v 6 -02 § Version 02 (01 presented in IETF 75 Stockholm) § Authors/Contributors: M. Boucadair, C. Jacquenet, JL. Grimault, M. Kassi-Lahlou, P. Levis (France Telecom); D. Cheng (Huawei); Y. Lee ( Comcast) § Further to the comments received during IETF 75 softwire session, we present here the main changes from 01 to 02: – Difference with mesh – Routing considerations (Routing Architecture Example) 2

IPv 4 and IPv 6 Internet Connectivity IPv 4 Internet ISP CPE IPv 6 DS-lite CGN CPE: Customer Premises Equipment CN: Correspondent Node 3 IPv 4 CN

IPv 4 and IPv 6 Internet Connectivity IPv 4 Internet ISP CPE IPv 6 IPv 4 DS-lite CGN CN CPE: Customer Premises Equipment CN: Correspondent Node ISP CPE 4 IPv 6 Internet CN

A voluntary migration towards IPv 6 CPE 5 ISP IPv 4 or IPv 6 Internet 6 v CN ly n O IP

IPv 4 Internet Connectivity with IPv 6 in Access and Core IPv 4 Internet ISP CPE 6 IPv 6 DS-lite CGN IPv 6 IPv 4 CN

IPv 4 Internet Connectivity with IPv 6 in Access and Core IPv 4 Internet ISP CPE IPv 6 DS-lite CGN ICXF: Interconnection Function 7 IPv 6 ICXF IPv 4 CN

RFC 5565 Mesh IPv 4 AFBR IPv 6 AFBR IPv 4 – IPv 4 tunneling through an IPv 6 -only backbone – Interconnection function at the backbone's edge routers called AFBR – All AFBRs exchange i-BGP routes – The encapsulation at both sides uses a BGP-distributed route to retrieve the IPv 6 destination address of the distant softwire endpoint 8

Differences with RFC 5565 IPv 4 Internet ISP CPE IPv 6 DS-lite CGN IPv 6 ICXF IPv 4 – Asymmetry: CGNs, and IPv 4 Internet access points. – Interconnection function at each IPv 4 Internet access point called ICXF – All ICXFs exchange i-BGP information, CGNs are not compelled to participate in the i-BGP exchanges – The encapsulation at both sides is stateless; the IPv 6 destination address of the distant softwire endpoint is automatically generated, it embeds the IPv 4 destination address of the IPv 4 datagram 9 CN

IPv 4 -in-IPv 6 Stateless Encapsulation IPv 6 DS-lite CGN Stateless Encap Pref 6+@IPv 4 dest 10 ICXF IPv 4 Internet

IPv 4 -in-IPv 6 Stateless Encapsulation IPv 6 DS-lite CGN Stateless Encap Pref 6+@IPv 4 dest 11 Stateless Encap Pref 6+@IPv 4 dest ICXF IPv 4 Internet

A Routing Architecture Example 12

Routing Architecture Example IPv 4 BGP Advert: • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 13 IPv 4 Internet

Routing Architecture Example IPv 4 BGP Advert: • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 14 i-BGP Advert: • IPv 4 external IPv 4 Internet

Routing Architecture Example IPv 4 BGP Advert: • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet i-BGP Advert: • IPv 4 external Mesh-like 15 IPv 4 Internet

Routing Architecture Example IPv 6 IGP Advert: IPv 4 BGP Advert: • Pref 6 • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 16 i-BGP Advert: • IPv 4 external IPv 4 Internet

Routing Architecture Example We do not inject external IPv 4 routes into IGP! IPv 6 IGP Advert: IPv 4 BGP Advert: • Pref 6 • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 17 i-BGP Advert: • IPv 4 external IPv 4 Internet

Routing Architecture Example IPv 6 IGP Advert: • Pref 6+IPv 4(DS-lite pool) IPv 6 IGP Advert: IPv 4 BGP Advert: • Pref 6 • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 18 i-BGP Advert: • IPv 4 external IPv 4 Internet

Routing Architecture Example By the DS-lite CGN or by a default router IPv 6 IGP Advert: • Pref 6+IPv 4(DS-lite pool) IPv 6 IGP Advert: IPv 4 BGP Advert: • Pref 6 • IPv 4 internal IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 19 i-BGP Advert: • IPv 4 external IPv 4 Internet

Routing Architecture Example IPv 4 -in-IPv 6 @IPv 6 dest = Pref 6+@IPv 4 dest IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 20 IPv 4 Internet

Routing Architecture Example Goes to nearest ICXF (IPv 6 IGP standpoint) IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 21 IPv 4 Internet

Routing Architecture Example Decap IPv 4 packet Lookup: Best route is via another ICXF (mesh-like) or via an e. BGP peer IPv 6 ICXF DS-lite CGN ICXF IPv 4 Internet 22 IPv 4 Internet

Routing Architecture Example Internal communication IPv 6 DS-lite CGN ICXF IPv 4 Internet 23 IPv 4 Internet

Conclusion § Towards an IPv 6 -only ISP network § Also suitable for IPv 4 Core with IPv 4 -in-IPv 6 -in-IPv 4 encapsulation § This is an alternative to mesh – IPv 4 -in-IPv 6 encapsulations are stateless – DS-lite CGNs do not need to be i-BGP peers – The communication between DS-lite CGNs uses IPv 6 transfer capabilities 24

Question to the softwire WG § I-D. boucadair-dslite-interco-v 4 v 6 "Deploying Dual-Stack lite in IPv 6 only Network" as a Softwire WG document? – We are requesting the adoption of this document as working group document 25

Thank You