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Efficient Interface Selection for Multihomed Mobile Routers in Diverse Access Networks

This document discusses the issues surrounding multihomed mobile routers (MMRs) that connect to various wireless access networks, including WCDMA (3G), WiFi, and WiMax/WiBro. It emphasizes the necessity of selecting the right access network to optimize traffic forwarding within MMRs. Detailed traffic control options are introduced, alongside a test implementation using Fedora and specific kernel versions, which showcases the selection process based on predefined policies. Ultimately, it concludes that effective interface selection mechanisms are essential for maximizing the benefits of multihomed mobile routers.

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Efficient Interface Selection for Multihomed Mobile Routers in Diverse Access Networks

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  1. Interface Selection for a Multihomed Mobile Router(draft-park-mis-01.txt) 67th IETF Semun Lee Seoul National University smlee@mmlab.snu.ac.kr Seoul National University

  2. Problem statement • Various characteristics of access networks • WCDMA (3G), WiFi, WiMax/WiBro, … • A multihomed mobile router (MMR) has multiple kinds of wireless interfaces, each of which is attached to different access networks • How to exploit them? Seoul National University

  3. Multiple interface selection • A multihomed mobile router (MMR) selects appropriate access network to forward traffic Seoul National University

  4. Traffic control option • Option type • 001xxxxx • Option value length • 3 • Traffic class • Represents the traffic class to which the packet belongs • Preference • Represents the detailed requirement of the traffic Option type (8bits) Opt. value length (8) Traffic class (8bits) Preference (16bits) Seoul National University

  5. Test Implementation • Fedora core 4 • Kernel version • ARs and MMR: 2.6.15 • Other machines: 2.6.9 • Using ip6tables and libipq library, we captured packets from MN to CN at MMR and select proper egress interface of MMR for that packet • The interface is selected based on pre-defined policy • We tested video streaming from MN to CN Seoul National University

  6. Conclusion • An interface selection mechanism is needed to use the accessibility of a multihomed mobile router efficiently • Information needed to select appropriate access network is carried on the traffic control option in the Hop-by-hop options extension header Seoul National University

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