In this paper it is shown that for substantial increase of video quality in wireless network it is necessary to execute two obligatory points on modernization of the communication scheme. The player on the received part should throw back automatically duplicated RTP packets, server of streaming video should duplicate the packets containing the information of key frames. Coefficients of the mathematical model describing video quality in wireless network have been found for WiFi and 3G standards and codecs MPEG-2 and MPEG-4 (DivX). The special experimental technique which has allowed collecting and processing the data has been developed for calculation of values of factors.
In this paper an Internet service audience is studied in order to create a user kernel, with the audience represented as a list of IP addresses able to authorize access to the beginning of a network attack. Methods with which to determine the regular audience of an Internet service and to identify IP addresses from which such a network attack is carried out are offered. Experiments were performed involving a real network attack on a popular Internet portal. In order to isolate the source IP address of the attack a demonstration is provided regarding the efficacy of the simultaneous application of two criteria: exceeding the threshold for the UDP stream speed limit, and the number of flows generated with the test IP addresses.Keywords-Internet service audience, the threshold for the UDP stream speed limit, DDoS attacks
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