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Flow

The Flow tracking module is meant to start unifying the state keeping mechanisms of Snort into a single place. As of Snort 2.1.0, only a portscan detector is implemented, but in the long term, many of the stateful subsystems of Snort will be migrated over to becoming flow plugins. With the introduction of flow, this effectively makes the conversation preprocessor obsolete.

An IPv4 flow is unique when the IP protocol (ip_proto), source IP (sip), source port (sport), destination IP (dip), and destination port (dport) are the same. The dport and sport are 0 unless the protocol is TCP or UDP.


Subsections
Steven Sturges 2007-05-11
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