Šiame projekte buvo sukurtas nepertraukiamo interneto ryšio sprendimas, kuris pagerino darbo sąlygas įmonės viduje, o sujungtas kartu su serverių stebėjimo įrankiu – sumažino serverių nepasiekiamumo ir reakcijos į gedimus laikus. / With this project we‘ve created the continuous internet solution, which improved the working conditions inside the enterprise and connected with server monitoring tool - reduces server downtimes, services unavailability and quickens reactions to failures.

Ne tik administratoriai, bet ir vartotojai vis daugiau dirba nuotoliniu būdu, prisijungę prie serverių. Būtina užtikrinti saugų prisijungimą prie tokių darbo vietų. Šiandien yra daug programinės įrangos prisijungimui per VPN, panaudojant RSA raktų generatorius ir pan. Tačiau visi šie sprendimai dažniausiai yra brangūs ir ne kiekvienai kompanijai prieinami. Šio darbo tikslas – sukurti atviru kodu paremtą nemokamą sistemą darbui su nutolusiu serveriu, kurioje būtų skiriamas ypatingas dėmesys vartotojų autentifikavimui. / Administration of servers is responsible job and has to take into account security issues to ensure server reliability. In this work server security issues are analyzed and requirements for system of mobile server management are defined as well as architecture specification is described. The system uses three security factors and allows management of main server functions. It uses just open source solutions and can be used with different mobile devices which allow wider system usage. The made system testing proves system reliability while detailed manual increases system usage simplicity.

Detta projekt har haft som fokus att skapa ett system där användare med hjälp av SSH ska kunna logga in på en server och utföra konfigurationer på switchar och routrar med olika krav såsom att enbart en användare får vara inloggad i systemet åt gången. För att uppnå målen och kraven så användes ett par olika skript med språk såsom shell, bash, perl och expect. Resultatet visar en färdig produkt och att detta projekt var genomförbart. Lösningsförslaget finns presenterat i form av ett flödesschema och sedan vanlig text. Slutligen presenteras och diskuteras även andra alternativa lösningar. / The projects main focus have been to create a system mainly for the users that study network technology on a more advanced level. In order for the students to start to configure the switches and routers they need to access a server with the SSH protocol which was one of the requirements. Another requirement was that only one user should be able to configure at same time (so two users should NOT be able to configure the switches and routers at the same time). The scripting languages that was used was bash, shell, perl and expect in order to achieve these goals and requirement. The result shows a finished product and that this project was feasable. The solution is presented as a flowchart as an overview and some regular text that explains the scripts in more depth. There are of course a ton of other ways to solve this problem and a few of them are presented and discussed in the later chapters.

Problem teaching in the Bash command interpreter is often aimed at simply reproducing the commands that are shown to a student. Such an approach often prevents students from understanding the principle of using Bash and working in Linux in general, and such instruction can then motivate students to simply learn the commands by memorizing without any understanding of the substance in depth. Pupils do not learn how the command works, how and when it can be used in situations other than in the sample, where it was just typed and everything worked. Not to mention more complex scripts that require a combination of several commands with arguments in the exact sequence to make the script perform the required operations. Therefore, the main goal of this diploma thesis is to create a set of tasks that is focused on the principles of using the Bash command line interpreter and the basics of programming in it. A set of tasks should be useful in teaching informatics at a specialized secondary school or college. Individual tasks use the elements of problem education and students will solve problems of non-trivial disposition within them. Therefore, the tasks are not focused on the use of a basic command, but rather on teaching the concepts typical of Bash (eg. Redirecting outputs) and programming (eg. The specifics of using variables). The second, but not less important, goal was to verify the set of tasks in the secondary school education in order to obtain the most needed knowledge to evaluate them. This deployment was afterwards evaluated and, if appropriate, the editing of the selected problematic tasks was performed. At the end of the thesis, a manual for teachers was developed, in which is described in detail, of which of the tasks to teach the concept, how the teacher should use it and what are the most common mistakes of the students in solving it, so that a teacher using this set of tasks has with its application in their education as little work as possible and could easily prepare for it.

Predmetom diplomovej práce je skúmanie možností realizácie univerzálneho meracieho zariadenia v sieti LTE. Sú popísané základy M2M komunikácie a trendy v IoT. Cieľom práce je nájsť optimálny hardvérový základ, na ktorom následne bude možné konfigurovať LTE modem a získať údaje o stave a kvalite pripojenia k sieti. Následne bude vykonaná séria testov za účelom zmerania parametrov siete a výsledky budú spracované k prezentácii na webovom serveri vo forme grafov.

This thesis deals with measuring transmission parameters of the Internet network, in particular latency of ping, SSH protocol and bandwidth. The thesis is divided into a theoretical and a practical part. Theoretical part describes PlanetLab network, its brief history and contemporary projects. At the same time, tools for data mining from web pages are described. These information obtained from the theoretical part are used for creating PlanetLab nodes list and for programming applications which measure the network transmission parameters. Applications, list of nodes and obtained data are attached on DVD disc.

This diploma thesis is focused on making InfiSpector project easier to use and expand by automating frequently used processes, adding basic tests and expanding projects repository by adding continuous integration. Description of project InfiSpector along with its dependencies are described in the beginning of this thesis.This is followed up by the theory about Bash programming language, continuous integration, testing, etc. Next is analysis of project followed up by the description of implementation itself. Last part of this thesis evaluates accomplished results and proposes possible improvements.

Im Unix-Umfeld existieren zahlreiche Kommandointerpreter (Shells) unterschiedlichen Leistungsvermögens. Die Bourne-Again-Shell (bash) vereinigt die Fähigkeiten zahlreicher alternativer Shellimplementierungen und hat sich seit langem im Umfeld der freien Software etabliert. Obwohl erste Implementierungen der Version 2 bereits aus dem Jahr 1996 stammen, löst sie erst in den neueren Linux-Distributionen die Version 1.14 ab. Im Einzelnen geht es um: - Ausgewählte Fähigkeiten der bash - Neuerungen der bash, Version 2 - Die bash aus Sicht der Systemadministration

The thesis "General Security of the Internet of Things" deals with the analysis of networks with low power consumption in the theoretical part -- especially LoRaWAN networks. Further, the thesis deals with the general security of the Internet of things and the security risks of LoRaWAN networks. The practical part is focused on building the LoRaWAN gateway, which is realized with the Raspberry Pi platform with the iC880A-SPI extension module. The gateway is put into operation with full settings, assignment to the network server. Sensors configuration, creation an application, and assign it to the application server. In the practical part, a replay attack on LoRaWAN technology, which demonstrates the vulnerability of this technology, is realized.

My thesis is focused on the subject of working with distant stations connected with the laboratory control of Cisco academy. Station operations, i.e. laboratory control, have been carried in the environment of the Linux operating systems. The first part of the thesis includes a description of the laboratory, its network architecture and software equipment. Also, the VMware tool is described here. VMware tool is intended for virtualization of computer stations, where the virtual station is created. In this virtual station another operating system may be run. The problems of the command interpreter, its function and possibilities are described here too. Main attention is devoted to the Bash command interpreter and to the creation of the scripts. There are descriptions of the basic tools intended for the network communication with the distant stations. Among the most important parts belong the protected communication, the production of the autentization keys as well as the tool for data recording on more stations at the same time. The description of the access rights to the files and directories is included too. The target of this thesis was to create the scripts in the Bash programming language. The scripts are focused on working with the laboratory stations. They are the sublayers of the common project for this laboratory control. They were developed for the cooperation with the the web interface and MySQL database, created by Bc. Zdeněk Hrabal. The Scripts are intended for the finding information about the stations and virtual systems, and also for the recording images and configuration files of the virtual systems at the distant stations. Recording files and directories is enabled too. The other scripts deal with the erasing and changing of the rights of the particular files and directories. Setting commads with the super-user competence is used at this place. The scripts for the switching on and off the laboratory workstations were created too. To solve the problem described above I chose to develope more scripts. Each of them subserves the particular part of the task. The form of the input and output data of the scripts was select with the reference to the cooperation with the web interface and database. The data are implemented by the form of the input and output files. The output information and the process of the carried operations are displayed through the web interface. The scripts together with the web interface are placed and run from the school server adela.utko.feec.vutbr.cz. In the thesis the settings of the access privileges for the current directories and the files of virtual systems and scripts are presented too.