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Dynamic Tunneling Configuration for Network with Uni-Directional Link

Dynamic Tunneling Configuration for Network with Uni-Directional Link. ICCC99 – 15/09/1999 Mikiyo NISHIDA / KEIO Univ. Hiroyuki KUSUMOTO / KEIO Univ. Jun MURAI / KEIO Univ. General Description. Introdunction Characteristics of Uni-Directional Link Current Problems of Uni-Directional Link

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Dynamic Tunneling Configuration for Network with Uni-Directional Link

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  1. Dynamic Tunneling Configuration for Network with Uni-Directional Link ICCC99 – 15/09/1999 Mikiyo NISHIDA / KEIO Univ. Hiroyuki KUSUMOTO / KEIO Univ. Jun MURAI / KEIO Univ.

  2. General Description • Introdunction • Characteristics of Uni-Directional Link • Current Problems of Uni-Directional Link • Scheme • Dynamic Tunneling Configuration • Design • Message based mechanism • Implementation • Implement our mechanism • Conclusion

  3. Introduction(1) UDL • Uni Directional Link • One-way (most case:Multiple Access)data link • Satellite • Cable TV

  4. Introduction(2) Network with UDL • Network with UDL & BDL (Bi-Directional Link) • We assume UDL network in the Internet has UDL and another BDL accessibility

  5. Introduction(3)Tunneling Techniques • For Simulating link solution • tunneling • Current Tunneling Scheme • Static Configuration • Few Scalability • Too much management cost We propose ‘ Dynamic Tunnel Configuration Scheme’

  6. Current Problems(1)Routing in network with UDL • Current Internet Routing Protocol • Based on Link Bi-directonality • Approaches for using UDL network • Modify Routing Protocol • Provide Bi-Directional accessibility for UDL virtually

  7. Current Problems(2) Data-link address resolution in UDL • Multiple access data-link requires data-link address resolution • Ethernet use ARP protocol

  8. Current Problems(3)IP Address Assignment in UDL • UDL has a lot of receivers • IP address is limited resource

  9. Current Problems - Overall • Routing Problems • Data-link address resolution • IP Address Assignment

  10. Dynamic Tunneling Scheme(1) • We propose Dynamic Tunneling Configuration Scheme • Provide virtual return path of UDL automatically • Provide mechanism of data-link address resolution on UDL • Provide mechanism of IP address dynamic assignment

  11. Dynamic Tunneling Scheme(2) • Message based mechanism • Exchange messages over UDL and BDL • UDL Keepalive • Setup/Shutdown tunnel • Data-link address resolution • IP Address Automatically Assignment

  12. Design(1) General Description

  13. Design(2) Messages • Notify Message (via UDL) • Sender to Receiver • HELLO message • Notify Sender Information • Applied UDL Keep Alive

  14. Design(3) Messages • Control Message (via BDL) • Exchange each other • REQUEST Message (Receiver to Sender) • Notify Receiver beginning to use UDL • Request Tunnel Setup, IP Address Assign • REPLY Message (Sender to Receiver) • Reply for Receiver’s message • REFRESH/RELEASE Message (Receiver to Sender) • Notify Receiver uses UDL continuously / terminate using UDL

  15. Design(4) Modules • Virtual Link Module • Manipulate tunneling packets • Control Module • Manipulate messages • Set/Release tunnel • Set/Release interface’s IP address • Maintain IP/DL address

  16. Design(5) Operating cycle

  17. Implementation(1) • Target Architecture: • FreeBSD 2.2.1-Release • Modified data-link routine in Unix Kernel • UDL: Use Ethernet (Modified Output Routine) • BDL: Use Ethernet • Virtual Link Module is implemented in Unix Kernel • Control Module is implemented as user process application

  18. Implementation(2) Virtual Link Module • Total of 120 lines: • if_ethersubr.c • ether_input(), ether_output() • Add encapsulation/decapsulation function • if.c • if_ioctl() • Add manipulating tunnel information function

  19. Implementation(3)Control module • Code size • Total of 1450 lines / at Receiver • Total of 1436 lines / at Sender • Implement as user process application • Send and receive messages via UDP • Maintenance DL/IP address table

  20. Conclusion • Describe current problems of network with unidirectional link • Propose Dynamic Tunnel Configuration Scheme • Implement our proposed mechanism • Present usability of this scheme

  21. Future Work • Test many types of routing protocols • Improve performance and scalability

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