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QoS simulation model in NS2
Balej, Jiří ; Burda, Karel (referee) ; Šimek, Milan (advisor)
In this bachelor thesis is described fundamental principle of IPTV and all the necessary conditions for high-quality video and audio signal. In reference is the recommendation of DSL Forum TR-126, where are summarized QoS parameters for IPTV. There is the explanation of Triple play service as a combined distribution of television, telephone and high-speed Internet. In one chapter are presented methods for asssure Quality of Service (QoS). There are described the method of Integrated services and especially Differentiated services. It explains a function of edge and core routers in Differentiated services. Methods for random early detection (RED) a scheduling are described too. The aim of this thesis was to create two laboratory tasks in the Network Simulator 2. The first lab simulates VoIP traffic in data network and assure QoS for VoIP. In the second lab is a simulated the network with Triple play service and the goal is to assure the recommended parameters for IPTV. To resolve the aim of this work, was needed to study the function of Network Simulator 2 and focus on settings for Differentiated services.
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Geolocation of Internet nodes using IP address analysis
Henek, Jan ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
Tato práce se zabývá problematikou určování fyzické polohy pomocí rozboru IP adresy. Zkoumanou metodou geolokace je databáze Whois. Práce je rozdělena na teoretickou část – která obsahuje obecný popis geolokačních metod, práce se souřadnicemi a výpočtem vzdáleností na zemi, a na praktickou část – kde je popsán program využívající Whois k nalezení stanice. Na závěr jsou předloženy a komentovány výsledky měření přesnosti databáze Whois, a také porovnány s jinými metodami geolokace. Aplikace je přiložena na CD.
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Simulation of data transmission latency between nodes in IP networks
Balej, Jiří ; Molnár, Karol (referee) ; Komosný, Dan (advisor)
This master thesis is focused on the delays incurred in data transmitting over IP networks. The top of the paper is devoted to points, where delay is invoked and causes of the latency. For individual sources of delay are are described the parameters that affect the usual size of latency. The next section describes the types of networks and their typical delay. In the paper are also discussed tools for measuring delay and determining the number of intermediate devices. The thesis contains results of measurements delay time in the real network. For these results are listed conclusions about the delay for one intermediate device. There is also said general ratio of crow-fly distance and calculated distance. The last part deals the simulation of delay in the NS2 program. The results of thesis are scripts that shows the relation of delay and the number of switches, routers, and the length of the path.
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Optimization of signalization channel for Internet television
Matej, Michal ; Balej, Jiří (referee) ; Müller, Jakub (advisor)
The aim of this Bachelor's thesis is to propose a mechanism for optimizing the signaling channel in case of Feedback Target overload in hierarchical aggregation tree. Consequently to this verify the implementation of this mechanism in simulation environment of Java and to achieve the balance load among Feedback Targets. The theoretical part discusses the significant differences between traditional television transmission and television transmitted via the IP protocol, the methods of data transmission in IP network and key protocol called Tree Transmission Protocol working on the application layer of TCP/IP model. In this part there are explained the concepts of hierarchical aggregation of feedback channel such as Feedback Target Manager, Feedback Target, as well as packets FTD, FTS, and FTI.
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Active IP Geolocation for Verification Host Position in Internet
Balej, Jiří ; Róka, Rastislav (referee) ; Zdrálek, Jaroslav (referee) ; Komosný, Dan (advisor)
Dissertation thesis deals with methods for finding the location of the device in the Internet, based on knowledge of the IP address. The process is called IP geolocation and is currently solved by geolocation databases or by measurement of network properties to the IP address. The disadvantage of nowadays geolocation databases is an incorrect information about some locations, because they can be in large distance from correct position. The aim of the thesis is to develop a method for verification of a position from geolocation database using delay measurement. Because of it, there is a detail analysis of influence of partial delays on the distance estimation accuracy, calculated using measured delay between the landmark and the target IP address. For the same reason, long-term delay measurement was performed, where the IP geolocation accuracy was compared using calibration data from previous measurements. On this background, Cable Length Based Geolocalisation (CLBG) method is proposed. Principle of this method is built on the properties of partial delays, which depend on the length of transport media. Firstly, the method measures round trip time (rtt), which is subsequently lowered by intermediate devices and end stations delay. The geographical distance is estimated using signal speed in the transport media. Further, the winding media parameter is established, which is used to determine a constraint around the landmark. The intersection of all constraints defines the area, where the target IP is. The IP geolocation using CLBG gives better results than simpler methods (ShortestPing, GeoPing and SOI), in comparison with more advanced methods (CBG and Octant) the accuracy is similar. The disadvantage of the CLBG method is the size of region, where the target lies, but this is due to its purpose. The position found in geolocation database can be checked by evaluation if it lies in the region.
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Social-based Forwarding in IP Networks
Němec, Jan ; Balej, Jiří (referee) ; Hošek, Jiří (advisor)
This barchelor thehis focuses on problematics of data routing in mobile networks. First part of the work focuses on mobile networks and description of DTN and opportunistic networks. In next part of this work are described routing protocols which fits the concept of routing based on social status. Last part of the work focuses on design and realization of the chosen protocol from the previous part.
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Analysis of the communication path attributes for IP geolocation
Rajnoha, Martin ; Komosný, Dan (referee) ; Balej, Jiří (advisor)
The aim of this thesis was to study current resources to find location of stations in the network Internet, mainly active methods that are based on delay measurements. Describe origin of the delay and its parts. Next create an application that is able remotely measure the delay between stations and convert this delay to distance. Aplication calculate geographic position of station on based this distances. For measurement was used experimental network PlanetLab.
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Localization of nodes in Internet using Vivaldi system with adaptive time step
Mašín, Jan ; Balej, Jiří (referee) ; Komosný, Dan (advisor)
The aim of this thesis was to identification with the principles of logical evaluation of the position of stations on the Internet. Read up on the localization algorithm called Vivaldi with adaptive time step and subsequently to its implementation in the operating system GNU/Linux CentOS distribution. Do one's homework the PlanetLab experimental network (http://www.planet-lab.org/). At selected stations from the network transfer created by the application and verify its function on the real servers located at various places around the globe and assess the accuracy achieved by estimating the distance between stations on the PlanetLab network. In this scope of activity, the application was created to measure the delay prediction using Vivaldi algorithm with adaptive time step which is on principle of operation a client-server where the client performs the steps of the algorithm, Vivaldi and the server only listens, collects the resulting data Vivaldi algorithm and stores them neatly file. Furthermore, the application was developed for direct measurement of the delay, which also functions as a client-server. These applications have been transferred to the selected nodes from the PlanetLab experimental network. Subsequently, these nodes were running, to carry out the necessary measurements. The resulting values were work into tables of using Microsoft Excel. These values were then compared with direct measurements and competitive positioning by the King. Vivaldi localization methods with adaptive time step and the King, were compared based on calculated estimates of both real estate errors and measurement using distribution function of the relative errors of both methods. All this information was evaluated to compare accuracy of both the localization methods and direct measurements.
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Current methods for geolocation of Internet hosts
Doležel, Pavel ; Müller, Jakub (referee) ; Balej, Jiří (advisor)
This bachelor work deals with IP geolocation, which means the estimation of geographical location of unknown host in the Internet. The aim of my thesis was to make a delay measurement in PlanetLab Network and then with the use of GeoPing technique estimate the real location of the target. The main part of this work is focused on several different delay-based methods, especially GeoPing which employs „Nearest Neighbor in Delay Space“ algorithm in order to exploit the relationship between network delay and geographic location. Base ground for GeoPing is a database of the machines at known location. This database is composed of 9 probe machines, 260 hosts is used like a landmarks and targets. Estimation of unknown geographical location was done on 60 hosts.
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Active IP Geolocation for Verification Host Position in Internet
Balej, Jiří ; Róka, Rastislav (referee) ; Zdrálek, Jaroslav (referee) ; Komosný, Dan (advisor)
Dissertation thesis deals with methods for finding the location of the device in the Internet, based on knowledge of the IP address. The process is called IP geolocation and is currently solved by geolocation databases or by measurement of network properties to the IP address. The disadvantage of nowadays geolocation databases is an incorrect information about some locations, because they can be in large distance from correct position. The aim of the thesis is to develop a method for verification of a position from geolocation database using delay measurement. Because of it, there is a detail analysis of influence of partial delays on the distance estimation accuracy, calculated using measured delay between the landmark and the target IP address. For the same reason, long-term delay measurement was performed, where the IP geolocation accuracy was compared using calibration data from previous measurements. On this background, Cable Length Based Geolocalisation (CLBG) method is proposed. Principle of this method is built on the properties of partial delays, which depend on the length of transport media. Firstly, the method measures round trip time (rtt), which is subsequently lowered by intermediate devices and end stations delay. The geographical distance is estimated using signal speed in the transport media. Further, the winding media parameter is established, which is used to determine a constraint around the landmark. The intersection of all constraints defines the area, where the target IP is. The IP geolocation using CLBG gives better results than simpler methods (ShortestPing, GeoPing and SOI), in comparison with more advanced methods (CBG and Octant) the accuracy is similar. The disadvantage of the CLBG method is the size of region, where the target lies, but this is due to its purpose. The position found in geolocation database can be checked by evaluation if it lies in the region.
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