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Halifax, 31 Oct – 3 Nov 2011 ICT Accessibility For All 4over6 technology for IPv6 transition Yong CUI CCSA (Tsinghua University) Document No: GSC16-PLEN-71.

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Presentation on theme: "Halifax, 31 Oct – 3 Nov 2011 ICT Accessibility For All 4over6 technology for IPv6 transition Yong CUI CCSA (Tsinghua University) Document No: GSC16-PLEN-71."— Presentation transcript:

1 Halifax, 31 Oct – 3 Nov 2011 ICT Accessibility For All 4over6 technology for IPv6 transition Yong CUI CCSA (Tsinghua University) Document No: GSC16-PLEN-71 Source: CCSA Contact: cuiyong@tsinghua.edu.cn GSC Session: PLENARY Agenda Item: 7.3

2 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 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 2

3 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 Strategic Direction Heterogeneous addressing: Private/IPv4/IPv6 Difficult to use & manage Huge cost to upgrade & maintain ALG (Software) Stateful/stateless (Not Scalable) High Routing merge (No Scalable) 4/6 inter- connection Dual stack Tunneling Translation IP layer (Hardware) Stateless (Scalable) Low Separated routing (Scalable) E-IP over I-IP Processing Layer State Maintenance Operation Complexity IPv4/IPv6 Routing Application Scenario 3

4 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 Transition Challenges 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-IPv4 doesn’t fit IPv4-over-IPv6 works better 4

5 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 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 Transition Architecture 4over6 mesh Transparent transmission in backbone Extension of BGP Public 4over6 Heterogeneous access network Remote addr. Allocation managing of IPv6 tunnel Lightweight 4over6 Heterogeneous access + addr. sharing Adaptive port control protocol 5

6 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 4over6 Mesh Framework 6 IPv6 Backbone (CERNET 2) 4over6 IPv4 Network Stateless packet Encap/Decap Provide IPv4/IPv6 access by IPv6 backbone Extension of MP-BGP Setup 4over6 peer 4over6 Auto tunnels: “1:N”address mapping IPv6 Network IETF RFC 5565: Softwire mesh framework (Standards track RFC) Scenario:IPv4-over-IPv6/IPv6-over-IPv4 Multiple tunnel types support

7 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 Critical issues in access network Address allocation –Public IPv4 addr in end system to 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 IPv4 addr. allocation ISP IPv6 network IPv4 Internet 4over6 tunnel Full use existing IPv4 stack in end system AFBR Public 4over6 Lightweight 4over6 Lightweight 4over6 7

8 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 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 IPv4 Internet Public IPv4 addr Public IPv4 addr IPv6 Edge Network Local IPv4 Network Local IPv4 Network 4over6 TI Host/CPE 4over6 TC DHCPv4- over-IPv6 8

9 Halifax, 31 Oct – 3 Nov 2011ICT Accessibility For All GSC16-PLEN-71 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) IPv4 Internet IPv6 Edge Network Local IPv4 Network Local IPv4 Network TI Host/CPE TC No NAT Public IPv4 addr + port 9

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