The early nineties from the twentieth century, intrusion detection technology has been widely used to protect the global company, organization information network. But until today, most of the core foundation of IDS systems do not achieve significant progress in technology, still in the packet capture to be the basic pattern matching and feature non-intelligent search technology to detect attacks. 1. Calculation of the load. Continue the algorithm to the computation required is extremely large, for the full load of 100Mbps Ethernet, the calculation of the amount needed would be: signature packet bytes bytes the number of packets per second attack database number of features.
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