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Measurements of the intensity of traffic within a fixed interval of the AP
Kubík, Pavel ; Trzos, Michal (referee) ; Matocha, Tomáš (advisor)
The thesis analyzes the network traffic on a router with open source firmware. First is chosen a software platform, based on compatibility with available equipment. Then are assessed properties necessary for the development of custom applications. Support for various programming languages provided by the SDK, development environment and the available modules and libraries, for working with network interface. Based on these factors is then chose method to realize the program. He is implemented on the OpenWRT firmware in C / C + + using network library pcap. These funds are used to capture and analyze network traffic. Obtained data are processed using methods of technical analysis, namely on the basis of moving averages, Stochastic oscillator and Bollinger bands. Based on results of these methods are generated and verified estimates of traffic. They are based on linear extrapolation, simplified for fixed intervals. The validity of each method is verified on base of the estimated value. Method is verified if estimated value of the traffic volume is in the Bollinger band, which is given by the standard deviation. Each method is tested several times in real traffic with different input parameters. Then is evaluated the influence of parameters on the error rate of methods. Individual methods are compared and evaluated based on the behavior in different scenarios and based on the average relative error.
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Establishment of the graphic interface for firewall using Qt4 framework
Štefany, Martin ; Jelínek, Mojmír (referee) ; Matocha, Tomáš (advisor)
The aim of this thesis is to design an application, which will serve as a~graphical interface to the terminal application iptables. iptables is an application which uses the Netfilter framework for managing firewall in operating system GNU/Linux. Graphical interface is a~way how to raise a~comfort of firewall configuration and management, because user doesn't have to remember all of the commands and graphical interface also shows him actual structure and contents of the firewall in a~tree view. Thesis describes format and options of the commands and also the firewall structure and its function in Linux. Designed application is written in C++ language using aspects of object oriented programming and uses Qt4 framework. Qt4 is a~great framework for creating graphical user interfaces, brings a~lot of new classes and methods and extends programmer's possibilities during designing graphical or terminal applications for lots of platforms. Thesis also includes a~manual to designed graphical interface, to the application qIPtables, which user can use to learn the basics of using this application and firewall management.
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Kernel module definition and networking server configuration for Linux operating system
Pecho, Ladislav ; Matocha, Tomáš (referee) ; Komosný, Dan (advisor)
The goal of my work is to create two computer labs lessons. The first one is a guide in writing a simple Linux kernel module, and in making a file inside the procfs filesystem. The content of the file can be decided as late as at the moment of reading. The second lesson describes the configuration of a server which allows a computer to boot over network. DHCP server is used with a TFTP server for file transfers which are both handled by the dnsmasq program. The example configuration will display a menu on the client station. It is possible to select to boot either a Linux kernel, floppy disk image, Linux network installer, diagnostic tool Memtest, or a text mode game Grub Invaders. The chosen bootloader is pxelinux from the syslinux project.
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Administration and configuration of simplified database QoS MIB
Macura, Miroslav ; Matocha, Tomáš (referee) ; Hošek, Jiří (advisor)
The main aim of this work was to study the issue of the SNMP protocol and MIB database in order to focus on management and configuration of MIB database using the SNMP protocol. The Master's thesis in detail describes especially creating a communications model of the Manager - Agent type in an OPNET Modeler. In this modeling tool we created exchange of information from the side of the Manager to the side of the Agent via SNMP packets. The Master's thesis is mainly focused on the creation of the SNMP packet according to defined rules, then on reading of information from the MIB database on the side of the Agent and saves this information to the Manager’s MIB database. Exchange of informations is realized via the messages of type GetRequest, GetNext and GetResponse. These models are programmed in language C/C++ and then implemented into the environment of OPNET Modeler.
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Implementation of advanced filters based on packet classification using Linux
Malár, Lukáš ; Holešinský, Pavel (referee) ; Matocha, Tomáš (advisor)
The Master’s thesis ”The Implementation of the Advanced Filtering Based on the Packets’ Classification using Linux” is intended to the realization of an internet gateway. The gateway serves to make the connection between local network and the internet. The thesis contains a short theoretic description of parameters and types of QoS services. The classful and classless queues are mentioned in detail. The last theoretic part refers to the introducing of LDAP protocol and its usage. The practical part of this thesis captures the configuration of firewall, dns and radius server connected with LDAP databases. The thesis also contains detailed description of the production QoS by HTB with L7-filter including the compilation of system’s core. The end of the thesis contains the series of tests of created scripts.
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Protocol model design in OMNET++ simulator
Vohralík, Jan ; Matocha, Tomáš (referee) ; Novotný, Vít (advisor)
The aim of this Thesis is giving information about the network simulating system OMNeT++ and its extension INET framework and explore possible solution to implement missing protocol RIP. OMNeT++ is a discrete-event simulation environment. Source code is available and free for teaching and research purposes. Its primary application area is the simulation of communication networks, but because of its generic and flexible architecture, is successfully used in other areas like the simulation of complex IT systems, queueing networks or hardware architectures as well. The first part of Thesis decribes RIP protocol operations and conception of OMNeT++. At the second part of Thesis the implementation design and discussion of created modules and component is presented here. The final part of the Thesis was creating the laboratory problem on the basis experience gained. Implementation is realized in C++ programming language.
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Establishment of QoS filtering on IPv6 protocol using Linux
Matušina, František ; Holešinský, Pavel (referee) ; Matocha, Tomáš (advisor)
This diploma thesis is interested in establishment of QoS filtering on IPv6 protocol usány Linux. Thesis describe protocol IPv4 and protocol IPv6 and their differences. Problematic is implement to Linux. Because this problem is implement in Linux, I describe a few distribution of Linux in thesis. Another part of thesis are about QoS and about QoS implement on TCP/IP model. In practise part is make a propsal resolution working site under protocol IPv6 in Linux. Realize include install of server, clients and their configuration. Realize include script, that account, take control of the traffic. Changeing traffic is show in graphs. Graphs of measure are comented and outcome clear up. All graphs and scripts are add to attachments.
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Establishment of the Linux internet gateway using advanced filtering
Matocha, Tomáš ; Pust, Radim (referee) ; Jelínek, Mojmír (advisor)
The thesis Establishment of the Linux internet gateway using advanced filtering focuses on~the installation of~the Linux operating system on~the older computers, that functions as a gateway to connect clients in the internal network to the Internet. The thesis describes creation an advanced filter with using iptables. Shows some types of security against attacks from the Internet. The other chapters are discussed, advanced traffic control mechanism (such as a TC and a qdisc). The system queue, it is highly beneficial where it is necessary to hierarchically divide traffic between users. It describes types of queue and assembled configurations for clients in the internal network. Next chapter describes the DNS server caching-only type and application denyhosts, which increases the overall security system. Have your own DNS server is certified, especially if we want to reduce the data traffic. Last chapter describes the RADIUS server and its implementation using Apache and MySQL database. Furthermore, the configuration options are described and the examples of the particular configurations are provided. Finally, it presented a system for authentication through the RADIUS server. The thesis seeks to provide a~complex view of security and filtering.
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Server and client management hosting services using Qt4 framework and Linux
Matas, Jakub ; Stančík, Peter (referee) ; Matocha, Tomáš (advisor)
This thesis deals with the design and the implementation of a client/server application for the administration of hosting services. Other solutions of hosting services administration are listed as well and they are contrasted and compared with the assigned solution. A description of the particular hosting services and their setting for the Ubuntu Linux distribution are provided. A communication protocol and a data store serving to save all the client accounts and servers were designed. Basic principles of working with C++ framework Qt and its usage for the implementation of both the server and the client application are demonstrated. The basic settings of the server application enabling it to be launched on the server as a service are mentioned as well. In the last part a description is stated of working with the client applications and administration of the client accounts.
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Establishment of the graphic interface for firewall using Qt4 framework
Štefany, Martin ; Jelínek, Mojmír (referee) ; Matocha, Tomáš (advisor)
The aim of this thesis is to design an application, which will serve as a~graphical interface to the terminal application iptables. iptables is an application which uses the Netfilter framework for managing firewall in operating system GNU/Linux. Graphical interface is a~way how to raise a~comfort of firewall configuration and management, because user doesn't have to remember all of the commands and graphical interface also shows him actual structure and contents of the firewall in a~tree view. Thesis describes format and options of the commands and also the firewall structure and its function in Linux. Designed application is written in C++ language using aspects of object oriented programming and uses Qt4 framework. Qt4 is a~great framework for creating graphical user interfaces, brings a~lot of new classes and methods and extends programmer's possibilities during designing graphical or terminal applications for lots of platforms. Thesis also includes a~manual to designed graphical interface, to the application qIPtables, which user can use to learn the basics of using this application and firewall management.
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