Limitations of passive & active measurement methods in packet networks

Abstract: Measurements and simulations are the main tools for studying the performance of IP networks. Furthermore, active measurement techniques are becoming an integral part of real network performance management systems. But if excessive testing packets are generated and injected into the network, then it might lead to worsening congestion. However, passive monitoring of queue length distributions will not cause any intrusive effect to the network, but it may not be scalable. This paper will explore the limitations of passive and active measurements and provide some measurement results related to them. 1. Introduction. Managed IP networks have become a dominant factor in bringing information to users on a worldwide basis. Until recently, IP networks supported only a best effort service. This limitation has not been a problem for traditional Internet applications like web and email, but it does not satisfy the needs o