1. National Chi Nan University Multi-Homing Tunnel Broker Marcelo Bagnulo, Juan Fco. Rodríguez-Hervella, Alberto García-Martínez, Arturo Azcorra Universidad Carlos III de Madrid. Av. Universidad, 30 – Leganés, 28911 Madrid, SPAIN EUROMICRO 2004: Rennes, France Speaker: Burgundy Po-kang Chen

2. National Chi Nan University Problem Definition The wide adoption of RFC 3178 multi-homing solution implies the manual configuration of numerous tunnels on the ISPs, which may impose an important workload in ISP network administrators. 2

3. National Chi Nan University Background Multi-homing – Imposing extra stress to the Default Free Zone routing table. 3

4. National Chi Nan University Background (cont.) End-site prefix aggregation – Established connections will not be preserved in case of outage. – Increased connection establishment time in case of failure. – Ingress filtering incompatibility. 4

5. National Chi Nan University Background (cont.) 5

6. National Chi Nan University Background (cont.) 6

7. National Chi Nan University Multi-Homing Tunnel Broker We assume that the ISP clients have a commercial relationship with the ISP, so that the ISP can identify its clients and the prefix that the ISP has assigned to them. 7

8. National Chi Nan University Multi-Homing Tunnel Broker (cont.) TS = Exit Router 8

9. National Chi Nan University Multi-Homing Tunnel Broker (cont.) TS is a specific router with lower prefix announcing preference. 9

10. National Chi Nan University Conclusion The Multi-Homing Tunnel Broker has been developed as a proof-of-concept. 10

11. National Chi Nan University Reference Hagino, J. and H. Snyder, "IPv6 Multihoming Support at Site Exit Routers", RFC 3178, October 2001. Durand, A., Fasano, P., Guardini, I. and D. Lento, "IPv6 Tunnel Broker", RFC 3053, January 2001. T. Bates and Y. Rekhter, "Scalable Support for Multi-homed Multi-provider Connectivity", RFC 2260, January 1998. Cisco Document, BGP Case Studies. [online] Available at: http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a 00800c95bb.shtml#howbgpwork http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a 00800c95bb.shtml#howbgpwork Wikipedia, Ingress filtering. [online] Available at: http://en.wikipedia.org/wiki/Ingress_filtering http://en.wikipedia.org/wiki/Ingress_filtering Wikipedia, Default-free zone. [online] Available at: http://en.wikipedia.org/wiki/Default-free_zone http://en.wikipedia.org/wiki/Default-free_zone Wikipedia, Border Gateway Protocol. [online] Available at: http://en.wikipedia.org/wiki/Bgp http://en.wikipedia.org/wiki/Bgp 11