The Measurement of Bandwidth: A Simulation Study
Juan Carlos De Martin · InTech eBooks · 2010
This chapter presents a simulation framework for studying bandwidth quantisation and measurement. It does not represent any specific technology but rather an interconnection of generic FIFO queuing nodes which can approximate the behaviour of real networks. The reader is invited to experiment with the C++ source-code which is available online. The four algorithms investigated were PPTD, SLoPS, Idle Rate and TOPP. A fifth approach is Variable Packet Size (VPS) probing: This measures round-trip-times for a series of probe packets to each intermediate node (Prasad et al, 2003) using ICMP messages to signal back to the sender. By varying the packet size L , the serializdation delay L C can be separated from the independent propagation-time and the effects of queuing delay minimised by taking the minimum of several measurements. Though this can provide quite detailed information, it assumes Layer 3 functionality in all congestible links. The technique has therefore not been included in this study. The aim of this chapter is not to present any particularly significant new insights, nor to reproduce the full complexity of past research (which would require an entire book). We