There are many currently available tools for computer network simulation. However, all of these are intended for use by network engineers and are not designed for research tasks. Such simulation models have insufficient flexibility and degree of parameter variability to be used for research purposes. Here, it is proposed to create a simulation model for modern computer networks which allows for the research experimentation. It is proposed to use one of the open packages available which facilitate computer network simulation modelling (for example, OMNeT++) as a base platform. Open-architecture packages allow the researcher to create specialized simulation models. With the help of models created specifically for the needs of research, it will be possible to conduct properly rigorous experiments. This paper utilizes one of the existent implementations of the Barabashi-Albert model for generating computer network topologies. This simulation model can be run and tested within the OMNeT++ discrete event simulator.
Modelling large-scale networks requires significant computational resources on a computer that produces a simulation. Moreover, the complexity of the calculations increases nonlinearly with increasing volume of the simulated network. On the other hand, cluster computing has gained considerable popularity recently. The idea of using cluster computing structures for modelling computer networks arises naturally. This paper describes the creation of software which combines an interactive mode of operation, including a graphical user interface for the OMNeT++ environment, with a batch mode of operation more natural to the high-performance cluster, "Sergey Korolev". The architecture of such a solution is developed. An example of using this approach is also given.
Improving the quality of VoIP connections is a very important goal in the area of telecommunications. The proportion of multimedia traffic in relation to the total traffic supported by providers is constantly increasing. To identify and troubleshoot issues with VoIP connections, network providers need both criteria and a methodology for assessing connection quality. We offer a methodology for assessing the quality of VoIP connections. A comparative analysis of VoIP codecs is also made.
One of the most promising modern data transmission technologies is ad-hoc wireless peer-to-peer networks. A distinctive feature of such networks is the absence of a central node, which allows you to create connections "on the fly" with arbitrary connections between nodes. Ad-hoc networks are designed to create mobile computer networks and can be used, for example, to coordinate transport, in search and rescue operations and similar situations in which the use of infrastructure nodes is ineffective. When using Wi-Fi as a transport for selforganising sensor networks, attention should be paid to details. Wi-Fi technology is used in adhoc mode in self-organising sensor networks with non-hierarchical nodes. An experiment was conducted to measure the available bandwidth of a segment of the Wi-Fi network. This parameter was measured, and the dependence of the available bandwidth on the segment load was determined. We tried to create a tool for testing the Wi-Fi segment while also testing the tool's own performance in various configurations of the Wi-Fi segment.
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