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IPv6 Network Prefix Translation
Ježek, Lukáš ; Polčák, Libor (referee) ; Grégr, Matěj (advisor)
This master thesis deals with testing network prefix translation algorithm in IPv6. It tests existing implementation. This implementations are compared with each other. Some implementations end with error compilation. There are two options how to deal with this problem, it might be repaired or the port to the new kernel is created. Performance is tested with Spirent hardware packet generator.
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Modelling and Analysis of Campus Network at the BUT
Kojecký, Vladimír ; Veselý, Vladimír (referee) ; Grégr, Matěj (advisor)
This thesis deals with the design and implementation of tools for creating a computer network simulation model. Network analysis is based on configuration files from connected network devices. According to the requirements of the simulation it is necessary in the configuration file to focus on data relating to the monitored elements and their properties, or which may be of some influence. The output is then passed on simulation environment to form the desired network model by the observed data, which is already possible to perform simulations.
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Modelling of L2 Loop-Preventing Protocols
Hrnčiřík, Matej ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
This thesis informs about currently used technologies, which provide loop protection on data link layer of computer networks. It clarifies issues of Ethernet networks. Chosen protocols are then closely described. There are presented advantages and disadvantages of chosen protocols and they are compared to other technologies. Practical section describes the initial implementation of IS-IS in OMNeT++ environment, which serves as the basic building block of TRILL protocol. An important issue is to verify correctness of implementation.
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Identifying Skype Traffic Using NetFlow Data
Šebeň, Patrik ; Veselý, Vladimír (referee) ; Grégr, Matěj (advisor)
NetFlow is a network protocol commonly used for collectiong IP traffic information. But there is a way to use this collected data for indentifying clients in Skype communication. This paper describes identifiable patterns in Skype protocol and how to find them in NetFlow data. This way we can identify nodes and supernodes in Skype network.
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Computer Identification Using Time Information
Jirásek, Jakub ; Grégr, Matěj (referee) ; Polčák, Libor (advisor)
This work deals with the identification of a remote computer by monitoring TCP timestamps of the tracked device. It is possible to determine computer's clock skew from these timestamps as the clock skew is unique for every device. We are able to differentiate devices even though they have changed location, network address or connection type. Passive data capturing ensures that the identification process is invisible to the fingerprinted computer. It is necessary that the network communication of fingerprinted computer is visible to the observing device. We are able to utilise only TCP traffic with timestamps enabled.
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Modelling IS-IS and TRILL
Marek, Marcel ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
In this thesis, we describe the principles of IS-IS routing protocol. We introduce the current state of implementation of this protocol within the simulation framework OMNeT++. We present the implementation of the IS-IS protocol created within the ANSA project. Moreover, we employ its variant called TRILL that is nowadays deployed as replacement of STP in data-center environment. The aim is to enable the modelling of the protocols without the need having to build physical architecture.
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Modelling Gateway Redundancy Protocols
Vítek, Petr ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
This master's thesis report deals with the theoretical analysis of FHRP. First Hop Redundancy Protocols are network protocols which are designed to protect the default gateway and also to ensure high availability in the network by using redundancy. The reader becomes familiar with protocols VRRP, HSRP and GLBP and also learn the way how to configure them to on real Cisco devices. It also describes how implement VRRP int the simulated enviroment of OMNeT++. The result of the implementation is verified in the test topologies.
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BitCoin Wallet for Windows Phone Platform
Prokop, Tomáš ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
Master's thesis deals with description of a new trading system known as BitCoin. Bitcoin is a unique type of virtual cash in the current world without the influence of large corporations. The system is protected through the use of cryptographic methods that are discussed in detail. The work explains the principles of integrity of transactions exchange transactions and the acquisition of new money through so-called miners. Individual miners services are mediated through software clients including a description of mining. The paper focuses on protocols for communication. It analyzes the different types of software purses for platforms Windows, Linux and Android. Examining reengineering of purses for Android. This document in no small part discusses the implementation own wallets for the Windows Phone platform 8th.
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Load Balancing in OpenFlow Networks
Marciniak, Petr ; Ryšavý, Ondřej (referee) ; Grégr, Matěj (advisor)
The aim of this thesis is to develop a load balancing tool for OpenFlow networks. Software-defined networking (SDN) principles are introduced (OpenFlow protocol used as an example) and compared to the legacy routing and switching technology. Openflow is the first protocol/API enabling communication between the control and infrastructure planes of the software-defined networking model. Key features of the protocol are described and several OpenFlow controllers are introduced. Current best practices in computer networks load balancing are discussed as well. The load balancing application development process is described including the test laboratory setups - Mininet (SW) and OFELIA (HW). The application test results are evaluated and possible further enhancements to the program are discussed.
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Modelling of EIGRP Routing Protocol
Bloudíček, Jan ; Grégr, Matěj (referee) ; Veselý, Vladimír (advisor)
The network simulation allows analysis of the computer networks behavior and configured protocols. This thesis focuses on the EIGRP routing protocol and its integration into the OMNeT++ simulation enviroment. The text includes a detailed description of the protocol and its configuration on Cisco devices. Furthermore, the text focuses on design of extension that supports routing protocol. The following describes implementation of the protocol according to design. Finally, the implemented solution is compared with the output of real devices.
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