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Hidetoshi Yokota KDDI Lab Sri Gundavelli Cisco Kent Leung Cisco

Inter-technology handoff support in mobile mode for Proxy Mobile IPv6 <draft-yokota-netlmm-pmipv6-mn-itho-support-02>. Hidetoshi Yokota KDDI Lab Sri Gundavelli Cisco Kent Leung Cisco. IETF #76 Hiroshima. Implementation issue and a common practice.

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Hidetoshi Yokota KDDI Lab Sri Gundavelli Cisco Kent Leung Cisco

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  1. Inter-technology handoff support in mobile mode for Proxy Mobile IPv6<draft-yokota-netlmm-pmipv6-mn-itho-support-02> Hidetoshi Yokota KDDI Lab Sri Gundavelli Cisco Kent Leung Cisco IETF #76 Hiroshima

  2. Implementation issue and a common practice • Some host implementations do not allow migration of IP session(s) between interfaces • Some do, others don’t: the bottom line is there is no strict rule… • Use of “virtual interface” is a common practice to make it work without a big hack • The scope of the work is to document this known practice • NetExt WG should create a guideline for inter-technology handoff • Virtual interface approach can be one reference implementation

  3. Relationship between IP session and the interface • Loose coupling • IP address does not have one-to-one mapping with a physical interface • IP session may be maintained even if the interface is changed Tight coupling • IP address is bound to a physical address • IP session could be disconnected even if the same address is assigned Application Application Application layer [Socket I/F] TCP/UDP TCP/UDP Transport layer IP1 IP stack (IPv4/IPv6) IP stack (IPv4/IPv6) IP layer IP1 IP1 I/F “ppp0” I/F “wmx1” I/F “ppp0” I/F “wmx1” Datalink layer EVDO WiMAX EVDO WiMAX Physical layer

  4. Virtual interface approach for interworking (3) Application Communication Manager Application layer TCP/UDP Transport layer IP stack (IPv4/IPv6) IP layer (1) Virtual interface Datalink layer (2) I/F I/F Physical layer EVDO WiMAX additional software for interwork (1): Controls the switching of physical devices (2): Retrieves wireless conditions (e.g. signal strength) and turns the devices on and off (3): Configures the threshold of the signal strength or preferred interface

  5. Summary and proposal • Clarification of necessary functionalities for interworking • Showed how virtual interface can be involved with the physical interfaces and applications through the IP stack • Documentation of guidelines • NetExt WG should capture the aspect of inter-technology handoff and identify the virtual interface approach as a workable solution

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