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Detection of VoIP Applications in Network Statistics
Havelka, Ondřej ; Tobola, Jiří (referee) ; Žádník, Martin (advisor)
VoIP applications allow us fast and cheap communication over the internet. Due to the massive expansion of these applications in last few years, there is growth of VoIP traffic, which is needed to distinguish from other traffic. Detection of VoIP applications is related to data monitoring and network traffic classification. The work focuses on detection of these applications: GTalk, ICQ, Skype, WLM a Yahoo. There are presented two detection techniques. First of them is based on behavior of VoIP applications. This technique uses the statistical characteristics of network flows as packet frequency and packet size. The second method is based on searching for patterns in packet contents. These packets carry voice data using protocol RTP. Both techniques were experimentally verified and the results are presented in the work.
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Information System for Fair User Policy Management
Horčička, Jakub ; Kaštovský, Petr (referee) ; Tobola, Jiří (advisor)
This bachelor thesis presents methods for monitoring network activity with an aim to Cisco Systems NetFlow technology. Following chapters describe implementation of an information system that uses this technology especially for making the stats about particular users and allows checking of rules and data limits determined in ofeered tarifes.
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Company CRM Concept and Implementation Project
Špringl, Petr ; Tobola, Jiří (referee) ; Chlebovský, Vít (advisor)
This thesis deals with analysis and possibilities of improvements in the area of customer relationship management in a company. There is a theoretical framework regarding customer relationship management and CRM systems including their implementation. The thesis includes analysis of current state of CRM in a concrete company and a proposal of a new CRM system implementation schedule based on the analysis. Finally, there is a discussion of benefits of the proposed project and author's proposals heading to improvements of CRM in the company.
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Information System for Internet Service Provider
Straňák, Slavomír ; Ruttkay, Ladislav (referee) ; Tobola, Jiří (advisor)
This bachelor's thesis describe information system for internet service provider (ISP) with NetFlow technology for monitoring of networks. The thesis characterizes whole NetFlow architecture, individual protocols, their best advantages and frequency application. It specifies detail design and implementation of information system and their basic parts. To achievement this design was applied technology XHTML, CSS, PHP and MySQL, which offer strong implement for making of dynamic application available on network Internet.
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Web Portal for Network Traffic Anotation
Málik, Peter ; Tobola, Jiří (referee) ; Žádník, Martin (advisor)
Bachelor´s thesis aim is to create a system for network traffic anotation. For this purpose it is necessary to correctly determine the protocols for all layers of the network model TCP/IP. To identify the application layer protocol is used a method based on port numbers and a method based on tracing the signatures in packet´s data field by using regular expressions. Web portal was written in PHP, using the extension phpcap and tcpdump program, which provides manual anotation of network traffic.
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Detection of Dynamic Network Applications
Oroš, Petr ; Kaštil, Jan (referee) ; Tobola, Jiří (advisor)
This work deals with the detection of dynamic network applications. It describes a general method for detection of any application layer protocol and automatically searches for the detection rules. The practical part deals with general detection protocol to the automatically generated designs. A special section is devoted detect bittorrent protocol.
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Flexible Network Flow Measurement
Varga, Ladislav ; Tobola, Jiří (referee) ; Žádník, Martin (advisor)
This thesis deals with designing the probe used for measuring network flows. It contains theoretical analysis of network measurment topic, description of algorithms and principles used for network flow measurement. Emphasis on the probe architecture lies on efficient indexing algorithm and flow record flexibility, such that user is able to define format of flow record.
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Eluding and Evasion of IDS Systems
Černý, Marek ; Tobola, Jiří (referee) ; Žádník, Martin (advisor)
This paper analyzes network security devices called intrusion detection (ID) systems. In order to point out possible flaws, especially ID systems using signature analysis are examined. Based on this, methods to exploit possible vulnerabilities of these systems were designed. These methods were implemented into a simple program for ID systems efficiency evaluation. It can be used in a way entirely independent of particular network attack used in the test.
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Web Portal for Network Traffic Reporting
Zapletal, Petr ; Straka, Martin (referee) ; Tobola, Jiří (advisor)
This thesis deals with the design and implementation of web portal with reports about network traffic. This system is designed for easy network monitoring with transparent charts a tables. To obtain statistics from network traffic, NetFlow technology, which is the key part of system, is used. Portal is platform independent and is built around HTML and PHP technologies. Portal also allows export proccessed data through periodic email service or files in PDF format.
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Longest Prefix Match Search
Chrastina, Ondřej ; Puš, Viktor (referee) ; Tobola, Jiří (advisor)
This thesis deals with the problem of an efective routing and a data clasification in computer networks, in particular searching for the longest prefix match for the internet protocol of version 6. First the algorithm, Binary Trie, Level Compressed Trie, Lulea Compressed Trie and Binary Search on Intervals, are described and then tested to find the the most suitable algorithm from the viewpoint of memory requirements and the speed of the searching.
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