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Advanced filtering operation in the Linux operating system
Janura, Dominik ; Pelka, Tomáš (referee) ; Szőcs, Juraj (advisor)
This thesis is oriented on the subject of advanced filtering operations and network security under Linux operating system. It explains the procedure of creating a simple packet filtering firewall using the netfilter framework and verifies its efectivity. It further examines the options of user identification in peer-to-peer networks using L7-filtering. It contains design of a system that detects traffic in the most used P2P networks. This system’s function is attested by simulating a P2P traffic inside the local network.
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Gathering and processing of access point data
Kislinger, Jan ; Szőcs, Juraj (referee) ; Růčka, Lukáš (advisor)
This work deals with gathering and processing of access point data. At the beginning, we introduce the SNMP protocol and MIB databases. Additionally, there is ways to gather data. The next section describes data processing. First, using moving averages and candelstick chart, then calculate the predicted values. Finally, it describes a program that gather data and draws them into the charts.
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Advanced features of traffic shaping for 802.3 and 802.11 networks under OS Linux
Pánek, Michal ; Endrle, Pavel (referee) ; Szőcs, Juraj (advisor)
This bachelor work deals with possibilities of traffic shaping and control in OS Linux. First part of the work examines indiviual tools needed for working with data stream. The second part consideres methods intended for traffic shaping. From these methods intended for use in standarts 802.3 and 802.11 were selected and described. The second part of paper focused on Hierarchical Token Bucket and Class-based queueing method. The third part is the practical application of methods on the hardware, the measurement of the individual standards and processing into charts.
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Gathering and processing of access point data
Kislinger, Jan ; Szőcs, Juraj (referee) ; Růčka, Lukáš (advisor)
This work deals with gathering and processing of access point data. At the beginning, we introduce the SNMP protocol and MIB databases. Additionally, there is ways to gather data. The next section describes data processing. First, using moving averages and candelstick chart, then calculate the predicted values. Finally, it describes a program that gather data and draws them into the charts.
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Multimedia Data Distribution over Internet
Vodák, René ; Szőcs, Juraj (referee) ; Číka, Petr (advisor)
The text of this work deals with multimedia data distribution over Internet with a focus on creating web pages using application APIs that are available on Google and creating an independent video portal using open-source scripts ClipBucket and PHPmotion. There are analyzed problems of transmission of video and audio data using Web browsers. There are described protocols and codecs for video streaming in web browsers. In details it is described creating of Web sites with the inclusion of application API directly into the HTML source code and creating an independent video portal with a complete configuration of the server for hosting. As an annex the created Web pages are listed with video content and laboratory exercises on the practical test and integration of multimedia content and the practical administraton of the video portal.
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Implementation of Asterisk VoIP PBX
Schön, Martin ; Münster, Petr (referee) ; Szőcs, Juraj (advisor)
The thesis is divided into two parts, theoretical and practical. In theory, it analyzed the signaling protocols, the RTP protocol for data transmission, VoIP Asterisk PBX and security options. The practical part describes the installation of the Asterisk PBX, conducted demonstration call forwarding. PBX was associated with an LDAP directory server to manage users and ejabberd for text messaging protocol XMPP. It was configured translation SIP-Skype using the SiSky Gateway and with dialplan SIP-H.323 translation. The study was to develop Dialplan with IVR. It was measured bandwidth of the audio/video codecs in an encrypted/unencrypted connections.
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Advanced filtering operation in the Linux operating system
Janura, Dominik ; Pelka, Tomáš (referee) ; Szőcs, Juraj (advisor)
This thesis is oriented on the subject of advanced filtering operations and network security under Linux operating system. It explains the procedure of creating a simple packet filtering firewall using the netfilter framework and verifies its efectivity. It further examines the options of user identification in peer-to-peer networks using L7-filtering. It contains design of a system that detects traffic in the most used P2P networks. This system’s function is attested by simulating a P2P traffic inside the local network.
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Analysis of Audio Codecs Applied in IP telephony
Hlavica, Michal ; Szőcs, Juraj (referee) ; Škorpil, Vladislav (advisor)
Issue of this diploma thesis is focused on analysis of audio codecs used within IP telephony. Attention of teoretical part is given mostly to audio codecs according to ITU-T recommendations, but also to signaling protocols used here. For practical part of analysis is chosen router Cisco 2821 and IP phones Cisco 7975G. Configuration is done over operating system Cisco IOS. Chosen signaling protocol is SCCP. For analysis itself are chosen 2 analysers – L-580FX and Fluke NetTool. These are used in combination with program Wireshark. Analysed parameters are latency, packet lost, bandwidth, jitter and mean opinion score. Measured values are presented in graphs and tables and they are discussed. Next output of the thesis is laboratory excercise, which deals with analysis of audio codecs.
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Analysis of delay dependence of modern communication services and channels, QoS optimization
Rozman, Jiří ; Szőcs, Juraj (referee) ; Endrle, Pavel (advisor)
The main aim of this thesis is to familiarize with options of services using real-time data transfer in wireless networks. Theoretical part presents wireless network based on IEEE 802.11 standard and its practical use. Large part is focuses on 802.11e standart, that provides support for quality of service in wireless networks. Furthemore this thesis deals with transport and applicaton protocols supporting multimedia streaming over computer network. Second chapter is focused on analyzing real computer network with purpose in measuring parametrs influencing quality of service such as bandwith, delay, jitter and loss. Last part deals with the design of wireless network in OPNET Modeler enviroment with focus on simulating parameters that influence quality of service.
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