What is the purpose of Snort inline?

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The purpose of Snort inline is to enable real-time packet filtering by having iptables utilize Snort rules to analyze and process packets as they pass through the network. This inline configuration allows Snort to actively examine traffic flows, making it possible to take immediate action based on predefined rules. For instance, if a packet matches a rule indicating malicious behavior, Snort can drop, modify, or redirect that packet, effectively functioning as an intrusion prevention system (IPS).

This active involvement of the packet filtering process is crucial for securing networks in real-time, as it allows for prompt management of threats. By integrating Snort directly into the packet flow through iptables, organizations can enhance their security posture significantly, since they are not just observing traffic but proactively managing it based on established security policies.