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Generating non-standard packets and data flows on Ethernet networks for teaching purposes
Mošnerová, Tereza ; Dvořák, Jan (referee) ; Jeřábek, Jan (advisor)
This diploma thesis is aimed at the process of generating non-standard data streams that contain hidden information. For this purpose a software called Ostinato is used. Ostinato allows to select protocols on the individual layers of the TCP/IP network model according to the needs and preferences, and moreover, data bytes can be inserted and modified arbitrarily using the HexDump fields. Various fields of the TCP/IP protocols are used to hide data on the network, transport and application layers. The generated data packets can be easily modified which enables to create several other versions of them. These can serve, for example, as a semestral project assignment for the subjects Communication Technology and Modern Communication Techniques taught at BUT. In addition, the size limits of the inserted data of the individual data packet options are tested. The functionality of the generated packets is verified by Wireshark. As a result, several .ostm and .pcapng files including a text file with their clear description are provided.
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Laboratory scenarios for comparison of protocols allowing transmission of web pages
Moučka, Martin ; Grenar, David (referee) ; Jeřábek, Jan (advisor)
This diploma thesis focuses on theoretical and practical comparison of webpage transport protocols such as HTTP/HTTPS (Hypertext Transfer Protocol) v1.1, SPDY, HTTP/2 and QUIC using UDP (User Datagram Protocol), TCP (Transmission Control Protocol) and SCTP (Stream Control Transmission Protocol) as transport protocols. This work also contains design and manual for practical laboratory tasks on which can students verify theoretical assumptions. These tasks compares protocols in different conditions such as packet loss, latency and jitter.
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Stress tester
Shpak, Kyrylo ; Člupek, Vlastimil (referee) ; Zeman, Václav (advisor)
The bachelor thesis deals with the issue of stress testing. The aim of this work is to extend the JMeter tool with amplification modules of DoS attacks. The beginning of the work introduces the issue of DoS attacks, along with a description of selected attacks. One of the points of the work is to verify the functionality and find errors of the stress tester, which is a comprehensive system for testing the information and communication infrastructure based on the JMeter tool. The last chapter deals with the implementation of DoS attacks.
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Network tester
Štainer, Martin ; Člupek, Vlastimil (referee) ; Zeman, Václav (advisor)
The objective of this thesis is the issue of network parameters measuring. Measurement methodology and tester concept were designed. Based on the designed tester concept a plugin for Apache JMeter was implemented. Two experimental tests were run based on the methodology designed, with their objectives set to explore the difference in performance between QUIC and TCP protocols.
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Utilization of Wireshark software in Communication technology course
Šíma, Jan ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
This bachelor thesis is focused on the issue with protocol set TCP/IP. Specifically it is about protocols ICMP, TCP, DNS, SIP and RTP. Main purpose of this thesis is to create two complex scenarios suitable for laboratory exercises for Communication technology course. The scenarios contain instructions with the solution procedure for students, including additional tasks. The first scenario introduces students to the Wireshark environment. Furthermore, this program is used to analyze captured packets, which were described in the theoretical part of the work. To capture packets of certain protocols, the command line and ping, traceroute, and nslookup commands, including their parameters, are also used in the scenario. The second scenario focuses on the VoIP call analysis, including the restoration of the captured call. The second part of this scenario compares differences between protocols TCP+TLS and QUIC while loading the secured web page. Both scenarios were tested in a school laboratory, where the scenarios are developed in a virtualized operating system. Also, each scenario contains additional questions for students and for teacher there is prepared a file, which contains the correct answers.
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Prostředí pro měření síťových parametrů přenosu transportních protokolů
Nešpor, Patrik
The thesis focuses on the development of a methodology and environment for measuring network parameters of transmission using the QUIC and TCP transport protocols. To validate the methodology, the SCP protocol was selected, which can also be used through the QUIC protocol. Manipulation of network parameters was conducted through experimentation with the Linux tool Traffic Control. The thesis also includes predefined scenarios designed to simulate real traffic in various situations. The measured results for each predefined scenario indicate that the QUIC protocol for SCP exhibits certain shortcomings, and optimization is needed for both the QUIC protocol for different application protocols and the adaptation of application protocols to the QUIC protocol.
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Využití protokolu QUIC pro přenos souborů
Hubený, Michal
This thesis deals with the usability of the QUIC protocol for file transfer. The aim of the thesis was to deploy existing implementations of application services (SMB, HTTPS), that are also able to use QUIC as a transport protocol. Subsequently, in the implemented topology, test how fast and durable protocols based on the TCP and QUIC are in an environment, where different kinds~of~negative network effects (delays, packet loss, ...) will be simulated. The results were achieved using dozens of measurements for each individual of scenarios. As the results indicate, file transfer on QUIC protocol is not yet as~efficient~as its existing TCP-based variants. At the conclusion of the work, the individual recommendations of the author are presented for which situations it is appropriate to choose a specific solution, so that the best results for the user are achieved.
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Porovnanie výkonnosti implementácií webových serverov podporujúcich HTTP/3
Rumančíková, Simona
The bachelor thesis contains a comparison of implementations of selected web servers supporting HTTP/3 protocol. In the introductory chapters, the chosen technology is introduced and certain web servers that support the HTTP/3 protocol are presented. Then the actual implementation of the three web servers (Caddy, Nginx, OpenLiteSpeed) supporting HTTP/3 is described. The purpose of the thesis culminates in the final chapter, where the results of the static web page retrieval are compared. Testing is simulated with selected negative events not only using the Firefox web browser, but also using the Linux traffic control software. These results are represented graphically and conclusions are drawn from them. Of the six simulations, OpenLiteSpeed had on average the shortest load time for the entire web content in up to three cases. A this was in the unbounded, Regular 4G/LTE and Good 3G situations. Caddy had the shortest average load time for web content with limited bandwidth and at 200 ms delay. For packet loss, Nginx had the shortest average load time for all web content.
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Utilization of Wireshark software in Communication technology course
Šíma, Jan ; Langhammer, Lukáš (referee) ; Jeřábek, Jan (advisor)
This bachelor thesis is focused on the issue with protocol set TCP/IP. Specifically it is about protocols ICMP, TCP, DNS, SIP and RTP. Main purpose of this thesis is to create two complex scenarios suitable for laboratory exercises for Communication technology course. The scenarios contain instructions with the solution procedure for students, including additional tasks. The first scenario introduces students to the Wireshark environment. Furthermore, this program is used to analyze captured packets, which were described in the theoretical part of the work. To capture packets of certain protocols, the command line and ping, traceroute, and nslookup commands, including their parameters, are also used in the scenario. The second scenario focuses on the VoIP call analysis, including the restoration of the captured call. The second part of this scenario compares differences between protocols TCP+TLS and QUIC while loading the secured web page. Both scenarios were tested in a school laboratory, where the scenarios are developed in a virtualized operating system. Also, each scenario contains additional questions for students and for teacher there is prepared a file, which contains the correct answers.
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Stress tester
Shpak, Kyrylo ; Člupek, Vlastimil (referee) ; Zeman, Václav (advisor)
The bachelor thesis deals with the issue of stress testing. The aim of this work is to extend the JMeter tool with amplification modules of DoS attacks. The beginning of the work introduces the issue of DoS attacks, along with a description of selected attacks. One of the points of the work is to verify the functionality and find errors of the stress tester, which is a comprehensive system for testing the information and communication infrastructure based on the JMeter tool. The last chapter deals with the implementation of DoS attacks.
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