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Netdev Driver for Acceleration COMBO Cards
Tran, Dominik ; Vrána, Roman (referee) ; Kučera, Jan (advisor)
This thesis deals with the development of the network device driver for the FPGA network COMBO cards, which should enable receiving and sending packets through standard network interface of Linux kernel. CESNET is developing a device called DDoS Protector for protection against an amplification (D)DoS attacks, which uses COMBO cards to achieve high performance. A SZE2 interface is used for high speed transfers of network data between COMBO card and a controlling software application, using technique of bypassing kernel network stack and other methods. DDoS Protector has to support standard network protocols, whose implementation directly on top of the SZE2 is very difficult. Instead, using kernel network stack, which is, by default, bypassed to achieve high performance, is much easier to implement and supports all sorts of protocols. Creation of the network device driver enables us to use kernel network stack and other network applications for COMBO cards. Based on the study of SZE2 interface and driver development, I designed and then successfully implemented network device driver. Driver was tested to ensure standard protocols work. It was also tested from the performance point of view. I have also developed the same type of driver for the newer interface - NDP and an application for an accelerated packet forwarding, both of which are functional and were not part of the thesis specification.
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New Parallel and Regulated Automata and Grammars
Kučera, Jiří ; Průša, Daniel (referee) ; Sawa, Zdeněk (referee) ; Meduna, Alexandr (advisor)
Tato práce zkoumá a zavádí čtyři nové jazykové modely se zaměřením na regulované a paralelní verze automatů a gramatik. První z modelů, stavově synchronizované systémy automatů , zavádí systémy složené z konečného počtu zásobníkových automatů jejichž činnost je řízena slovy z řídícího jazyka nad množinou stavů. Druhý model, neomezené hluboké zásobníkové automaty , je variantou hlubokých zásobníkových automatů z nichž bylo sejmuto omezení kladené na hloubku expanze na zásobníku. Třetí model, skákající čisté gramatiky , zavádí skákající gramatiky bez neterminálních symbolů. Poslední model, k#$-přepisující systémy , rozšiřuje #-přepisující systémy o přídavnou zásobníkovou paměť. Text této práce je členěn do tří částí. První část uvádí motivaci k zavedení studovaných jazykových modelů a zasazuje je do kontextu souvisejících oblastí teorie formálních jazyků. Je zde také uveden přehled o celkové organizaci práce, základních pojmů teorie formálních jazyků a současných poznatků souvisejících s předmětem výzkumu. Druhá část tvoří jádro této práce. Jsou v ní formálně definovány všechny nově zavedené jazykové modely a studována jejich vyjadřovací síla. Poslední část uzavírá tuto práci souhrnem získaných teoretických výsledků společně se souvisejícími otevřenými problémy a nastiňuje cesty dalšího výzkumu spolu s výhledy na možná využití.
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IPv6 Prefix Generator
Obrusník, Vojtěch ; Kučera, Jan (referee) ; Matoušek, Jiří (advisor)
Incoming deployment of IPv6 technology in larger scale requires existence of effective route lookup algorithms suitable of manipulation with long IPv6 prefixes. Development of such algorithms is dependent on an huge amount of test data sets, which do not exist at the moment. This paper is focused on design and implementation of a tool, that would be able to generate such test data sets. Study phase of IPv6 address allocation polices and analysis of currently available pieces of prefix sets took place before the implementation. Validation of results was performed by bit value and prefix length scatter measurement.
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Protection Against DoS Attacks Using P4 Language
Vojanec, Kamil ; Fukač, Tomáš (referee) ; Kučera, Jan (advisor)
This thesis focuses on reimplementation of existing DoS (Denial of Service) attack mitigation device with high-level P4 programming language. The main reason for using P4 is to enhance adaptability and functionality to different types of DoS attacks. The created device is designed in a modular way and enables easy alterations by using interchangeable components. The target platform for this thesis is an FPGA acceleration card. The work results in designing several DoS mitigation components and implementing applications composed of these components. Pats of this work have been presented at IEEE ANCS (Symposium on Architectures for Networking and Communication Systems) in September 2019 at University of Cambridge.
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Implementation of Self-Correcting Codes for 100 Gb/s Ethernet
Velecký, Jan ; Kučera, Jan (referee) ; Kekely, Lukáš (advisor)
The thesis deals with the design of entire RS-FEC layer for the 100 Gb/s Ethernet according to IEEE 802.3-2015 standard including Reed-Solomon encoder and decoder. Text clarifies mathematical basis of finite fields, linear block codes, cyclic codes and particularly Reed-Solomon codes used in design. Design of RS-FEC layer transmit side has been adjusted for implementation in COMBO network cards which use Xilinx Virtex-7 FPGA and realized in VHDL. Encoder has been optimized in several steps - as for FPGA resource usage and as for VHDL code synthesis duration. Reduction of resource usage has been achieved by using pipelining thanks to properties of cyclic codes. Synthesis duration then by creating logic of encoder on gate level on its own. Resulting implementation has been tested in simulation and it is optimized enough for usage in FPGA for Ethernet implementation. It is possible to adapt both design and implementation for 400Gb/s Ethernet which does not exist yet at the time of design.
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The Evulation of the Financial Situation in the Firm and Proposals to its Improvement
Provázek, Tomáš ; Kučera, Jiří (referee) ; Luňáček, Jiří (advisor)
This diploma thesis occupies with financial analysis of a firm. The aim of this thesis is to suggest some recommendation to change economy of the analyzed firm. The theoretical section of the thesis describes some methods of financial analysis, above all elementary methods. In the practical part, these methods are used for the compilation of a financial analysis of firm Family brewery Bernard and to evaluation of the economy situation of the firm. The final part brings some recommendation for improvement of the economy of the analyzed firm.
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Performance Measurement Tool for DNS Servers
Postolka, Matěj ; Kučera, Jan (referee) ; Vrána, Roman (advisor)
Tato práce popisuje návrh a tvorbu testovacího prostředí pro měření výkonnosti DNS serverů nad transportními protokoly TCP a UDP. Obsahuje výsledky výkonnostního měření tří různých implementací autoritativních DNS serverů nad síťovým provozem složeným z různých typů DNS dotazů zaslaných pomocí různých síťových a transportních protokolů. Je provedeno srovnání výkonnosti těchto implementací.
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New challenges for the newsvendor problem
Kučera, Jiří ; Popela, Pavel (referee) ; Hrabec, Dušan (advisor)
This bachelor thesis focuses on the newsvendor problem with marketing. The first part deals with basic newsvendor problem and various modifications of the basic problem are discussed. In the following part the basic problem is modified by adding marketing and then the process of finding the optimal solution for an additive and mupliplicative form of demand is demonstrated. In this part the result for chosen model of additive case of demand is also presented. Real life applications of the newsvendor problem with marketing are then described at the end of the thesis. For some of these applications the impacts of marketing on real life markets are demonstrated.
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Module for Network Policy Monitoring in Flow Data
Piecek, Adam ; Kučera, Jan (referee) ; Wrona, Jan (advisor)
The aim of this master's thesis is to design a language through which it would be possible to monitor a stream of network flows in order to detect network policy violations in the local network. An analysis of the languages used in the data stream management systems and an analysis of tasks submitted by the potential administrator were both carried out. The analysis specified resulted in the language design which represents pipelining consisting of filtering and aggregation. These operations can be clearly defined and managed within security rules. The result of this thesis also results in the Policer modul being integrated in the NEMEA system, which is able to apply the main commands of the proposed language. Finally, the module meets the requirements of the specified tasks and may be used for further development in the area of monitoring network policies.
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