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A Flow-and Packet-level Model of the Internet

Several models of packet-switched networks have been proposed in the literature for analyzing network performance. There are two main types of models, called the packetlevel and the flow-level model, each making different assumptions about the operation of the network and providing different insights about its performance. While packet-level models are remarkably accurate, we find, from Internet packet traces and network simulations, that current flow-level models do not accurately model the Internet. This leads us to a new flow-level model that is more accurate and which, moreover, dovetails with a natural packet-level model to provide a complete description of the network. We validate our model via simulations and use it to provide a preliminary analysis of the Internet.