The demands of e-business in the extended enterprise have stretched the corporate network back through the supply chain and forward to channel partners and customer networks. Securing the communications infrastructure requires accurate enforcement of security policy, high performance for increasing traffic loads, and low latency to complete transactions. The trusted security model of network intrusion detection systems reporting alarms to IT for action has become overwhelming. Network security is officially in the sea-change from passive network intrusion detection to active network intrusion prevention. Network Intrusion Detection Systems, NIDS, were designed to
