We propose a third-party value-added srvices framework for enhancing the perofmranc eof reliable multicast protocols.In this framework,a value-added service provider will place servers called waypoints throughout ISPs' networks.Waypoints run a full y distributed,dynamic algorithm to determine which multicast groups to join.Having joined a group,a waypoint participates in the error recovery protocol,supplyign repairs to receivers.From the aplication's perspective,waypoints appear to be additional application endopoints in the network.
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