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This paper presents a flow control protocol for multi-sender multi-group multicast and unicast in wide area overlay networks. The protocol is analytically grounded and achieves real world goals, such as simplicity, fairness and minimal resource usage. Flows are regulated based on the "Opportunity" costs of network resources used and the benefit provided by the flow. In contrast to existing window-based flow control schemes, the authors avoid end-to-end per sender or per group feedback by looking only at the state of the virtual links between participating nodes.
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