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ISP measuring traffic of each individual user.

How does an ISP measure internet traffic use by each individual account and know the time of day they log on and how long each session the user log on.

How do they do all this?? Thanks in advance.

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Re: ISP measuring traffic of each individual user.

NetFlow is one way ISPs can track individual usage. The exported NetFlow data consists of traffic flows, which are unidirectional sequences of packets between a particular source device and destination device that share the same protocol and transport-layer information. The captured traffic statistics can be used for a wide variety of purposes, such as network analysis and planning, network management, accounting, billing, and data mining. Ciscp Secure/AAA is the most common method of user access traking.

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