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4 over6 technology for IPv6 transition. Yong CUI CCSA (Tsinghua University). IPv6 Transition Background. Contradictions in IPv6 transition Not enough IPv4 addr.(exhausted on 2011.2.3) Lack of IPv6 applications provided by ICP Hard to fulfill users’ demands after upgrading to IPv6

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4 over6 technology for ipv6 transition

4over6 technology for IPv6 transition

Yong CUI

CCSA

(Tsinghua University)


Ipv6 transition background
IPv6 Transition Background

  • Contradictions in IPv6 transition

    • Not enough IPv4 addr.(exhausted on 2011.2.3)

    • Lack of IPv6 applications provided by ICP

    • Hard to fulfill users’ demands after upgrading to IPv6

  • Key problems in IPv6 transition for ISP

    • Meet users’ IPv4 demands

    • Provide IPv4 transmission

    • Lower the cost of upgrading current network


Strategic direction
Strategic Direction

Dual stack

Translation

Tunneling

ALG

(Software)

Stateful/stateless

(Not Scalable)

High

Routing merge

(No Scalable)

4/6 inter-connection

IP layer

(Hardware)

Stateless

(Scalable)

Low

Separated routing

(Scalable)

E-IP over I-IP

Processing

Layer

  • Heterogeneous addressing:Private/IPv4/IPv6

  • Difficult to use & manage

  • Huge cost to upgrade & maintain

State

Maintenance

Operation

Complexity

IPv4/IPv6

Routing

Application

Scenario


Transition challenges
TransitionChallenges

  • Current situation

    • Slow IPv6 network construction

    • Huge cost of upgrading network equipments

  • Users’ demands

    • Provide full service support

    • The same User Experience with IPv4 services

  • ISP transition strategy

    • Complete the IPv6 network

    • IPv6-over-IPv4doesn’t fit

    • IPv4-over-IPv6works better


4over6 transition architecture
4over6 Transition Architecture

  • Solve IPv6 transition problems in backbone and access network

  • Transparently support existed services transiting to IPv6 network

  • Avoid losing IPv4 users

  • Access IPv4 resources over IPv6 network


4over6 mesh framework

Auto tunnels:

“1:N”address mapping

4over6 Mesh Framework

IETF RFC 5565: Softwire mesh framework

(Standards track RFC)

Extension of MP-BGP Setup 4over6peer

Provide IPv4/IPv6 accessby IPv6 backbone

Stateless packetEncap/Decap

IPv4 Network

IPv4 Network

4over6

4over6

IPv6Backbone(CERNET 2)

4over6

4over6

IPv4 Network

IPv4 Network

IPv6 Network

IPv6 Network

  • Scenario:IPv4-over-IPv6/IPv6-over-IPv4

  • Multiple tunnel types support


Critical issues in access network
Critical issues in access network

  • Address allocation

    • Public IPv4 addr in end systemto avoid large scale NAT

    • AFBR allocate IPv4 addr(+port) to end system

  • State maintenance in AFBR

    • Stateless:46 addr. embedding

    • Stateful:IPv4-IPv6 mapping,decouple IPv4/IPv6 addr

  • IPv4 addr multiplexing

    • Implement stateful/stateless multiplexing

Public 4over6

Lightweight

4over6

IPv4 addr.

allocation

Full use existing IPv4 stack in end system

ISP IPv6 network

AFBR

IPv4 Internet

  • 4over6 tunnel


Public 4over6
Public 4over6

  • IPv4 address allocation in IPv6 network

    • DHCPv4-over-IPv6

  • IPv4-over-IPv6 data transmission

    • Outbound: encapsulation IPv6 destination addr is tunnel concentrator (TC) addr

    • Inbound: use IPv4-IPv6 mapping to get tunnel initiator (TI) addr

DHCPv4-over-IPv6

Public

IPv4 addr

IPv4 Internet

Local IPv4

Network

IPv6 Edge Network

4over6TC

4over6 TI

Host/CPE


Lightweight 4over6
Lightweight 4over6

  • IPv4 address multiplexing

    • Make full use of IPv4 address resources

  • Critical tech

    • Based on public 4over6

    • TC allocates public IPv4 addr + port to TI

    • TC need to maintain a lightweit address mapping (IPv6–IPv4 aadr + port)

No NAT

IPv4 Internet

Public IPv4 addr + port

Local IPv4

Network

IPv6 Edge Network

TC

TI

Host/CPE