June 2010
Intermediate to advanced
224 pages
5h 18m
English
Content preview from Network Flow AnalysisBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Flow Export and Timeouts
Most medium to high-end routers and switches store flow data, but they don't necessarily provide a way for a human being to look at the flow data locally. Instead, to analyze flow records, you must first export the flow records from the hardware to a computer. Flow sensors export their records when the corresponding network activity is complete or when a timeout expires.
The exported record is not necessarily a complete TCP/IP session, however. For example, downloading an ISO image from an Internet site can take a very long time, and that session will probably be represented in several consecutive flow records.
Why break long-running sessions into multiple records? Suppose your router exported flow records only when each ...
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