Snort, a public domain intrusion detection system, monitors traffic by analyzing every packet on a network, looking for malevolent content. It does this by putting the network adaptor in promiscuous mode so that it can see all network traffic on the wire, a process referred to as packet sniffing. Snort is a rule-based IDS, which means that it applies a set of rules to each packet based on known attack signatures. When it detects an attack signature, it performs the action designated in the rule.
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