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3 Monitoring & Analysis There's an old saying which applies to bandwidth management: "You can't manage it until you measure it." If your Internet connection is saturated with so much trafc that it makes your daily browsing seem like a trip to the dentist, you need to take a serious look at what is going down that pipe. Once you have a complete understanding of how your Internet connection is being used, it will become clear which course of action needs to be taken in order to x the prob- lem. Without the insight that good monitoring tools and techniques provide, you can not underst and the effec ts that cha nges wil l mak e. Tr yin g to x network problems, without rst establishing a clear picture of what is happening, is a lot like trying to x a car engine by knocking on vario us parts with a hammer . Y ou might get lucky and knock something into place that gets the car going again (for the momen t), but you will inev itably run in to more proble ms later . In the process of knocking on some parts, it's likely you will cause unintended dam- age to other parts of t he engine. Bandwidth management is not a dark art or a mystic philosophy; it is a me- thodical technique of problem identication, analysis, and resolution. By moni- toring the performance of your network, and analysing the resulting data over time, you will be able to make effective changes that solve performance prob- lems, yielding measurable improvements. Before we can answer the question of where the network bottlenecks lie, we need to understand how the network works. Once we understand what make s information ow from here to there, we will have a better idea of what to look out for when that ow is not as fast as we would like it to be.

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