On Mar 9, 2009, at 12:52 PM, John Von Essen wrote: > With Netflow, you are "interpolating" the rates off those sampling > points. NetFlow is a network protocol, of which there are various implementations. What you are describing is Sampled Netflow and would not be suitable for billing. But that is not the only way. http://en.wikipedia.org/wiki/Netflow Matt