On the Configuration of Simulations of Large Network Models with HTTP/TCP Sources
نویسندگان
چکیده
The simulation of realistic networks is an important aspect in the development of new protocols or algorithms. We have considered – to the author’s knowledge for the first time – the problem of calibrating the total number and the allocation of HTTP traffic sources in a simulation model of a TCP/IP network with a target matrix of traffic flow intensities. The configuration of a large simulation model is rather complex: the total number of sources needs to be adjusted as well as the number of sources per flow. A simple estimate of the average rate per HTTP/TCP source is derived for calculating the total number of required sources. The authors propose a new method for solving the above mentioned problem in two or more steps: a simple estimation for the source rate and the source distribution over all flows is derived, which is used for a first pilot simulation. Successive simulations use the measurements of the respective previous simulation to minimize the difference between given and achieved traffic matrix. The performance of the proposed method is evaluated with two rather complex simulation scenarios: the parking-lot and the B-WiN model. The simulation results show the fast convergence of the method despite larger deviations from the given traffic matrix in the first pilot run.
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