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Communities Of Interest (COI) have been studied in the past to classify traffic within an enterprise network, and to mitigate Denial-of-Service (DoS) attacks. The authors investigate the use of Communities Of Interest (COIs) to prioritize known good traffic on the Internet. Under the system, an ISP may construct a COI for each of its enterprise customers. The COI would contain entities which have previously had good communications with the customer. These COIs could then be used in combination with traffic differentiating mechanisms during periods of heavy traffic in order to prioritize traffic from communicating entities known to be good.
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