Cluster based packet capturing is a way of overcoming the speed of a slow disk to tap a high-speed network. Most cluster-based architectures, however, do not consider load balancing as an important issue. In order to perform monitoring at full line speed without losing packets, the paper accepts that the balance among back-end servers must be maintained. Conventional methods rely on fixed or random routing where a "Source-destination" address pair is used as a unit for load balancing. Instead of using such a coarse grain unit, the paper uses a flow, a "Source-destination-port" pair. In addition, the paper adaptively balances loads of back-end servers using a flow load estimation technique. The proposed methods have been validated by performing a trace-based simulation.
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