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4 over6 technology for IPv6 transition

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

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  1. 4over6 technology for IPv6 transition Yong CUI CCSA (Tsinghua University)

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

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