___________________________________________________________________________

2010/TEL41/DSG/WKSP2/012 Agenda Item: Demo

IPv4/IPv6 Strategies for Broadband ISPs Submitted by: Juniper Networks

Workshop for IPv6: Transforming the Internet Chinese Taipei 8 May 2010

06/16/2010

IPv4/IPv6 Strategies for Broadband ISPs 6RD / Dual Stack / DS‐Lite / CGN/NAT64/… Alain Durand 8/5/2010

IPv6 Reality Check: the IPv4 Long Tail Post IPv4 allocation completion: ƒ Many hosts in the home (eg Win 95/98/2000/XP, 

Playstations, consumer electronic devices) are IPv4 Playstations consumer electronic devices) are IPv4‐only only. ƒ They will not function in an IPv6‐only environment. ƒ Few of those hosts can and will upgrade to IPv6. ƒ Content servers (web, email,…) hosted on the Internet by 

many different parties will take time to upgrade to support  IPv6. Current measurement: 0.15% of Alexa top 1‐million web sites are available via IPv6 Source: http://ipv6monitor.comcast.net

2

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

1

06/16/2010

Broadband ISP Strategies 1) Maintain IPv4 service after IANA IPv4 completion ƒ Goal: ƒ Provide IPv4 service without a unique global IPv4 address per customer.

ƒ Technologies: ƒ NAT444/Carrier Grade NAT (if access network is not IPv6‐ready) ƒ DS‐Lite (IPv6‐ready access network) ƒ NAT64 (for green field IPv6 deployment)

2) Deploy IPv6 ƒ Goals: ƒ Lower dependency on IPv4 addresses to manage end devices ƒ Reduce cost of ISP NAT infrastructure for Internet traffic: A packet that travels over IPv6 end‐to‐end is one less packet that need to  go through the NAT

ƒ Technologies: ƒ Native IPv6 (when possible), automatic tunneling (6RD) 3

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

IPv6 Deployment Strategies

4

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

2

06/16/2010

Dual‐Stack: Native IPv6 and IPv4 Service Wireless device is provisioned with IPv4 & IPv6

Dual‐Stack home

Requires: ‐ Full IPv6 Access network ‐ IPv6 ready back office ‐ IPv6 home gateways

IPv4 & IPv6 ISP network

IPv4

Home gateway is provisioned with  global IPv4 and IPv6

5

IPv6

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

6RD: Native IPv4 + IPv6 Overlay Service Wireless device is  provisioned with private IPv4 plus automatic 6RD prefix

ISP RFC1918 IPv4 network

Dual‐Stack home

No change to: ‐ Access network ‐ Back office Requires: ‐ A small number of stateless 6RD relays ‐ 6RD‐aware IPv6 home gateways

IPv6/IPv4 tunnel

6RD relay Home gateway is provisioned with global IPv4. 6RD prefix is automatically derived. 6

6RD stands for p Deployment p y Rapid

IPv6

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

3

06/16/2010

IPv4 Exhaustion Strategies

7

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

Business as Usual: Pure IPv4 Network Wireless device  provisioned with global IPv4

ISP IPv4 network

As long as a supply  of IPv4 addresses can fuel growth…

IPv4

Private IPv4  in the home

8

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

4

06/16/2010

Carrier Grade NAT: Double IPv4 NAT Impact: ‐Double NAT ‐customers are assigned private IPv4 addresses (RFC1918) ‐Little/No customer control on CGN ‐ Applications that cannot adapt will break A li ti th t t d t ill b k

Wireless device provisioned with private IPv4

NAT

ISP RFC1918 IPv4 network IPv4

NAT Private IPv4  in the home

NAT 9

Two levels of NAT break applications expecting incoming connections.

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

DS‐Lite: Native IPv6 + IPv4 Overlay Service The IPv4 NAT function is moved from the home gateways to a box in the service provider network: Only one level of NAT

Dual‐stack wireless device  provisioned only with IPv6

Requires: ‐ IPv6 access network ‐ DS‐Lite aware IPv6 home gateways

IPv6 ISP  network

IPv4 & IPv6  home IPv4

IPv4/IPv6 tunnel

AFTR Home gateway is provisioned only with IPv6

10

IPv6 traffic flows directly

Copyright © 2010 Juniper Networks, Inc.

IPv6

www.juniper.net

5

06/16/2010

NAT64: IPv6‐only for Green Field Deployments Wireless device  provisioned only with IPv6

No IPv4 device No IPv4 application IPv6‐only  service in home

Requires: ‐ IPv6 access network ‐ All customers devices and applications MUST support IPv6

IPv6‐only ISP network IPv4 NAT64

Home gateway is provisioned only with IPv6

11

IPv6

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

IPv6 Transition Stages  Stage I              Stage II                  Stage III 6RD

Native Dual‐Stack

Dual‐Stack Lite

Initial rapid deployment of an IPv6 overlay over  IPv4

Gradual deployment of IPv6 access network

IPv4 overlay over IPv6

CGN (NAT444)

Double NAT 6RD may subsist in zones  where native support is  NAT64 lagging or uneconomical Green field IPv6 networks When IPv4 addresses are no longer available…

All these technologies may co‐exist within an ISP… 12

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

6

06/16/2010

Impact on Broadband ISP Some form of IPv4 address sharing in the ISP  network is necessary to address upcoming  shortages of IPv4 addresses.

A toolbox of relevant technologies helps ISPs to  g p address environments at different stage of IPv6  transition. 13

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

Impact on Home Gateways

Deploying IPv6 requires a software update or  Deploying IPv6 requires a software update or full replacement of customers home gateways.

IPv6 home gateway = IPv6 + DS‐Lite + 6RD

14

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

7

06/16/2010

References draft‐ietf‐softwire‐dual‐stack‐lite‐03 ƒ Status: WG last call completed draft‐ietf‐softwire‐ipv6‐6rd‐08 ƒ Status: WG last call completed

15

Copyright © 2010 Juniper Networks, Inc.

www.juniper.net

8