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Abstract:

The Internet has grown from a research network to a world-wide network which is used daily by millions of people. The increasing popularity is accompanied by increasing demands on consumeroriented services such as telephony and video streams, known from circuit-switched networks. This type of application require a guaranteed Quality of Service, because of their real-time nature. To satisfy these new consumer demands, the Internet must be adapted, since it was originally designed as a data packet network with best-effort packet forwarding capabilities. At that time the focus was on connectivity. If no special provisions are taken, no guarantees can be made on the duration that a packet will take to travel to it’s destination, and thus no Quality of Service (QoS) can be assured. In the future, Quality of Service will probably be assured in the Internet by using the diffserv framework proposed by David Clark and Van Jacobson. In the diffserv framework, packets are classified for QoS services only at the border of the providers according to fixed classes. Aggregates of flows are thus formed and the overhead is much lower than other QoS enforcing systems such as intserv where flows are treated independently by every router. Unfortunately no specific

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