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Currently multimedia services for customers are rapidly being deployed (e.g., IPTV), and scalable multicasting is required for the needs of the services, e.g. robustness, security, and QoS. While native IP multicast is considered a good solution for the multimedia services, variety of overlay multicast mechanisms have been suggested to remove the barriers that block deployment of IP multicast on Internet. However, most of overlay multicast mechanisms do not consider host group model, which is not a problematic portion, but an advantageous feature of traditional IP multicast in terms of scalability, robustness, and security.
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