https://community.extremenetworks.com/t5/network-architecture-design/flows-on-purview/m-p/14694#M2098 Flow are accounted unirectionally in periods of 60s. The session in your firewall is probably bidirectional so your flows/s should be roughly double your firewall sessions. One point, thought, that is the value at the point where the firewall is located. If you take traffic from other points in the network to purview, the results are completely unrelated. Tue, 22 Apr 2014 21:18:00 GMT Ferrer__Salvado 2014-04-22T21:18:00Z https://community.extremenetworks.com/t5/network-architecture-design/flows-on-purview/m-p/14693#M2097 What is different between flow and session? Most of firewall keep the session information for the traffic. Can we use that information to calculate the requirement of the flow/mins license for Preview Engine?<BR /> <BR /> Thanks. Fri, 18 Apr 2014 13:18:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/flows-on-purview/m-p/14693#M2097 r_____________9 2014-04-18T13:18:00Z https://community.extremenetworks.com/t5/network-architecture-design/flows-on-purview/m-p/14694#M2098 Flow are accounted unirectionally in periods of 60s. The session in your firewall is probably bidirectional so your flows/s should be roughly double your firewall sessions. One point, thought, that is the value at the point where the firewall is located. If you take traffic from other points in the network to purview, the results are completely unrelated. Tue, 22 Apr 2014 21:18:00 GMT https://community.extremenetworks.com/t5/network-architecture-design/flows-on-purview/m-p/14694#M2098 Ferrer__Salvado 2014-04-22T21:18:00Z