Andrei Vladyko

Fuzzy Model of Dynamic Traffic Management in Software-Defined Mobile Networks

Nowadays, in mobile networks, latency-sensitive services may compete for the bandwidth of other services, thus degrading overall performance. Software-defined mobile networks opening many new possibilities for dynamic traffic management. This gives chances to ensure strict requirements of the service quality in changing conditions. We considered two requirements for the quality of service: bandwidth and latency. Providing the required bandwidth is relatively simple compared to the end-to-end delay, as its guarantee requires a complex model that takes into account the mutual influence of flows throughout the entire path. Our model includes the following metrics: maximum channel utilization, traffic priority, the number of “hops”. Fuzzy balancer module has been developed for the Floodlight controller in Java. This module calculates the weights of the links in accordance with the proposed method. Simulation network was held in Mininet environment. During the experimental implementation, it has been shown that simple algorithm based on mathematical apparatus of fuzzy logic allows dynamically adapting the network to the change of the traffic volume, as well as its structure.

The life cycle of vulnerabilities in the representations of software for telecommunication devices

This article investigates the problem of search for software vulnerabilities in terms of their life cycle. Each point life of vulnerability determined by the state of software with form and content - software representation. A typical sequence of representations in the field of telecommunication devices is given. Description prototype of software tool for Methodological Support System for Development of Safe Software is given.

Method for partial recovering source code of telecommunication devices for vulnerability search

The article describes a automated method for searching of low level and medium level vulnerabilities in machine code, which is based on its partial recovering. Vulnerability search is positioned in the field of telecommunication devices. Typical vulnerabilities in source code and algorithms for its search is given. There is forecast to develop methods and utilities in the near future.

Method and prototype of utility for partial recovering source code for low-level and medium-level vulnerability search

The article describes a automated method for searching of low-level and medium-level vulnerabilities in machine code, which is based on its partial recovering. Vulnerability search is positioned in the field of telecommunication devices. All various and typical vulnerabilities in source code and algorithms for its search is given. The article contains examples of usage method and its utility. There is forecast to develop methods and utilities in the near future.

Testing of utilities for finding vulnerabilities in the machine code of telecommunication devices

The article is devoted to the authors machine code algorithmization utility to find vulnerabilities in telecommunication devices. The utility is compared with its closest analogue — the IDA Pro software and its plug-in — Hex-Rays. The paper presents the key tests that are used for such comparison and the results of software tools operation for them. The formalized outcome of the comparative analysis justifies the advantages of the authors utility for solving this task.

Centralized control of traffic flows in wireless LANs based on the SDN concept

The paper proposes to use a solution based on software-defined networks (SDN) to control traffic flows in wireless local area networks (Wi-Fi). The paper examines the testing methods for a software-configurable wireless local area network based on the model network of the St. Petersburg State University of Telecommunications. Classify traffic based on DSCP values in the IP-headers of packets. After classification, traffic will be given priority over the OpenFlow port of the switch. This method allows for end-to-end quality support and support for traffic classification when interworking. In the course of practical experiment, the interaction of access points (AP), which are emulated in Mininet with the SDN controller, is considered. When using the OpenDaylight controller, the network topology can be controlled through the user-friendly graphical interface (GUI) of the SDN. As a result, methods were examined using DSCP values for QoS management in SDN networks.