Some Questions that are hard to answer about IP networks
Traffic Matrix Construction
SNMP based methods
Flow based methods.
Outline of the rest of the talk
IP Flow Abstraction
Resources in the Measurement System
Measure/Export All Traffic Flows?
Packet Sampling and Flow Sampling
Size independent flow sampling bad
Size dependent flow sampling
What is best choice of p(x)?
Optimal vs. size independent sampling
Charging and Sampling Error
Accuracy and Parameter Choice
Compensating variance for mean
How to reduce unbillable usage?
Tension between accuracy and volume