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The primary aim of active and passive measurement techniques has been to characterize end-to-end path properties, and to model network traffic via backbone link monitoring. However, both active and passive techniques exhibit particular limitations owing to the fact they are independent and accessional mechanisms that are used to infer the properties of network traffic. The continuous growth in mobile and wireless markets and their integration over IP stresses the importance for future networks to be better-managed (measured-monitored-controlled) through native mechanisms, built-into the network functionality. This is also reflected in current measurement group activities of the IETF like the Internet Measurement Research Group, Passive Sampling and IP Flow Information Export.
An alternative approach applicable to IPv6 networks is to exploit the modular and programmable design philosophy of the IPv6 protocol itself to natively instrument measurement functionality where and when it is required. This talk will introduce such a concept, which we call "In-line Measurements", present a case for their use and demonstrate their feasibility based around early experimentation with the technique at Lancaster University and Agilent Laboratories in Scotland. The talk will also discuss how ideas from the ubiquitous networks and sensor networks areas can be applied to the monitoring of mobile and wireless data services.
