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In the context of a collaborating surveillance system for active TCP sessions handled by an networking device, the authors consider two problems. The first is the problem of protecting the flow table of per-flow monitoring from overflow and the second is developing an efficient framework estimating the number of active flows and identifying "Heavy hitter" TCP sessions, to reduce the overhead of data exchanged. Their approaches are sensitive to the limited hardware and software resources allocated for this purpose in the line-cards in addition to the very high data rates that modern line cards handle; specifically they are interested in cooperatively maintaining a per-flow state with a low cost which has resiliency on dynamic traffic mix.
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