User's Guide

Using Sites to Collect In-Network Traffic
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All statistics can be collected over multiple intervals and averaged. When
viewing report data, it is important to know the interval used for any average
that is displayed.
Certain statistics, such as bytes and flows, can be collected over multiple
intervals to provide a total over time, while other statistics, such as client count,
cannot. To illustrate, the number of bytes seen in two hours would be the total of
the number of bytes seen in each hour. However, the number of unique clients
seen in two hours would not be the total of the number of unique clients seen in
each hour, as some clients were probably seen in both hours.
Using Sites to Collect In-Network Traffic
While flow data collection can aggregate data for all flow traffic that is visible, it
may be more useful to aggregate data for in-network flows only. These are flows
used by clients that are located in your internal network. By collecting data for
only in-network flows, the overhead of aggregating data over an interval can be
reduced.