Den här rapporten tog sin början i det faktum att många företag och organisationer idag inte är insatta i vad IPv6 innebär och hur de ska gå tillväga för att implementera IPv6. Det fanns vid tillfället ingen komplett metod för hur en analys av ett nätverk gick till, vad som var viktigt att tänka på, vilka tekniker som fanns tillgängliga och hur dessa implementerades. För att underlätta framtida övergångar till IPv6 bestämde vi oss för att utveckla en generell metod som användaren kan följa och läsa sig till vad de behöver tänka på vid varje steg. Metoden ger också exempel på hur användaren kan göra analyser och undersökningar som leder fram till en lösning som kan fungera för deras behov. Metoden besvarade frågeställningen ”Vad behöver ett företag göra för att kunna implementera IPv6 i en existerande nätverksmiljö?” Övergången till IPv6 är igång och många tekniker är inte färdigutvecklade. För att ta fram lösningar som fungerar för olika scenarier gjordes efterforskningar på både IP version fyra och version sex samt vilka övergångs-tekniker som är att rekommendera. Ett antal övergångs-tekniker valdes ut och sattes upp i ett testlabb där IPv6-funktionaliteten verifierades. För att ta fram en metod som täckte upp de vanligaste scenarierna diskuterades frågan med Empir AB, ett företag som arbetar med IT-lösningar och som tillhandahåller egna tjänster. Deras nätverk analyserades och det arbetet låg till grund för utformningen av metoden. Eftersom alla tekniker i metoden testades i laborations-nätverket fastställdes IPv6-funktionalitet genom att testa olika tjänster över nätverket. Testerna visade att det var fullt möjligt att implementera IPv6 efter en steg för steg-modell. Resultatet av arbetet kan användas för att initiera och fullfölja en övergång till IPv6 då användaren har en metod att följa, rekommendationer på vad som behöver göras och föreslagna lösningar som kan implementeras enligt anvisningar. / This report began with the fact that many companies and organizations today do not have any or little knowledge about IPv6 and what it means, nor do they know how to implement it. At the time of writing there were no complete method for how an analysis of a network were done, what was important to think on and which techniques were available. To ease future transitions to IPv6, we decided to develop a general method that a user could follow step by step, with instructions for what to think on at each step. The method also gives examples on how the user could do an analysis and examinations, and it eventually leads to a solution based on their needs. The method answers the question "what does a company need to do to be able to implement IPv6 in an already existing network?" The transition to IPv6 is happening and many techniques is still in development. To be able to present solutions that work with different needs, research in IP version four, version six and in transfer techniques were done as well. A set of transfer techniques was chosen and set up in a lab network where IPv6 functionality was verified. To develop a method that covered most of the common scenarios, the question were discussed with Empir AB, a company that works with IT solutions that hosts their own services. Their network was analyzed and the result was the foundation for the method. Since all techniques in the method were tested in the lab network, the IPv6 functionality was verified by testing different services over the network. The tests showed that it was possible to implement IPv6 after a step by step model. The result of this work can be used to initiate and follow through with a transition to IPv6 since the user have a method to follow, recommendations to what needs to be done and proposed solutions that can be implemented after instructions.

With IPv4 addresses running out there is a need for IPv6 compatible routers. This study aims to find open source routers that have support for IPv6 and compare it in terms of performance to IPv4 to see if there are any differences in performance. In addition to this the chosen routers have also been evaluated in terms of security and other desired features. An experiment and a theoretical study evaluating this was carried out to help companies and individuals wanting to use IPv6 make choices in what open source router to use. Different performance factors were taken in to consideration as well as security features. There were no significant differences between IPv6 and IPv4 with IPv4 slightly beating IPv6. Between the routers there were some differences with the VyOS router outperforming pfSense in terms of throughput but pfSense had lower latency values. Depending on the requirements for a specific network environment the results of this study could be used to pick an IPv6-enabled open source router distribution.

Ingeniero Civil Electricista / La definición del protocolo IPv6 se perfila como la única solución a largo plazo para compensar la inminente escasez de direcciones IP a nivel mundial. Sin embargo, para lograr la adopción de este protocolo en las redes que actualmente operan sobre IPv4, se requiere de una estrategia que permita a una empresa proveedora de servicios de redes abordar este proceso de manera planificada. Motivado por lo anterior, este trabajo tiene como objetivo identificar las variables que condicionan la factibilidad de adoptar IPv6 en redes empresariales y definir un procedimiento general para abordar el proceso de migración en este tipo de redes. De este modo, se busca que una empresa de servicios de redes esté preparada para apoyar la migración a IPv6 y que las empresas clientes tengan claridad sobre los requisitos que deben cumplir para la adopción del protocolo. El trabajo comienza con un estudio de las ventajas que ofrece la adopción de IPv6, considerando sus características técnicas y su actual soporte por aplicaciones y equipos de uso común en redes productivas. Posteriormente, se propone una estrategia para desarrollar un servicio de validación de compatibilidad con IPv6, orientada a redes empresariales. Esta estrategia contempla cuatro actividades: Levantamiento de la red del cliente, instalación de un laboratorio demostrativo de validación de IPv6, clasificación de los equipos y aplicaciones de la red en función de su compatibilidad con IPv6 y - por último - una evaluación económica de los requisitos necesarios para lograr una compatibilidad total. Como complemento al servicio diseñado, se implementa en este trabajo el laboratorio demostrativo contemplado dentro del servicio de validación y además se propone una planilla para cuantificar los costos y beneficios asociados al proceso de migración, planilla que sirve de base para la evaluación económica incluida dentro del servicio. También se establecen recomendaciones generales sobre los aspectos a considerar por una empresa de servicios de redes en caso de llevar a cabo la migración a IPv6. El resultado de este trabajo es una estrategia que permite abordar el proceso de adopción de IPv6 mediante un servicio de validación de compatibilidad orientado a redes empresariales. Este servicio ayuda a las empresas a planificar de manera anticipada la migración y les permite alinear los requisitos de actualización de hardware y software con sus procesos internos de renovación tecnológica.

Mobility is an increasingly important aspect of communication for the Internet. The usage of handheld computing devices such as tablets and smartphones is increasingly popular among Internet users. However, the current Internet protocol, IP, was not originally designed to support mobility over the Internet. Mobile users currently suffer from connection disruption when they move around. Once a device changes point of attachments between different wireless technology (vertical handoff) e.g. from WiFi to 3G, the IP address changes, and the bound session (e.g. TCP session) breaks. While the IETF Mobile IPv4 (MIPv4) and Mobile IPv6 (MIPv6) solutions have been defined for some time, and implementations are available, they have seen little deployment due to their complexity and performance. This thesis has examined how IP mobility can be supported as first class functionality, i.e. mobility can be enabled through the end hosts only, without changing the current network infrastructure. Current approaches such as MIPv6 require the use of proxies and tunnels which introduce protocol overhead and impact transport layer performance. The Identifier-Locator Network Protocol (ILNP) is an alternative approach which potentially works end-to-end, but this is yet to be tested. This thesis shows that ILNP provides mobility support as first class functionality, is implemented in an operating system kernel, and is accessible from the standard API without requiring changes to applications. Mobility management is controlled and managed by the end-systems, and does not require additional network-layer entities, only the end hosts need to be upgraded for ILNP to operate. This work demonstrates an instance of ILNP that is a superset of IPv6, called ILNPv6, that is implemented by extending the current IPv6 code in the Linux kernel. A direct performance comparison of ILNPv6 and MIPv6 is presented, showing the improved control and performance of ILNPv6, in terms of flow continuity, packet loss, handoff delay, and signalling overhead.

Vast majority of wireless appliances used in household, industry and medical field share the ISM frequency band. These devices need to coexist and thus are challenged to tolerate their mutual interference. One way of dealing with this is by using frequency hopping; where the device changes its radio channel periodically. Consequently, communications will not suffer from the same interference each time; instead, it should be fairer and more stable. This thesis investigates the aforementioned problem in the field of low power wireless sensor networks and Internet of Things where Contiki OS is used. We introduce a low-power pseudo-random frequency-hopping MAC protocol which is specifically characterized as a duty cycled asynchronous sender-initiated LPL style protocol. We illustrate two flavors of the protocol; one that does not use any dedicated channel and another which allows dedicated broadcast channels that can implement frequency-hopping as well. We implement the protocol in C for real hardware and extensively test and evaluate it in a simulated environment which runs Contiki. It proved to work with Contiki's IPv6 stack running RPL (the standardized routing protocol for low power and lossy wireless networks). We compare the performance of the implemented protocol to the singlechannel ContikiMAC with varying levels of interference. Results show a reduction down to 56% less radio-on time (1.50% vs. 3.4%) and 85% less latency (306 ms vs. 2050 ms) in the presence of noise, while keeping a good basecost in noise-free environments with 1.29% radio duty cycle when using 9 channels with no dedicated broadcast channels (vs. 0.80% for single channel) and 252 ms average latency(vs. 235 ms). Moreover, the results show that the multichannel protocol performance metrics converge to almost the same values regardless of the noise level. Therefore, it is recommended as a good alternative to single channel ContikiMAC in realworld deployments where noise presence is anticipated.

Tato práce se zabývá problematikou přechodu mezi IP protokolem verze 4 a IP protokolem verze 6. Přechod je možné řešit více mechanismy a tato práce je zaměřená na přechodový mechanismus Stateful NAT64. Cílem práce je otestovat různé implementace NAT64 a najít vhodnou implementaci pro router NETX. Za cíl bylo stanoveno najít implementaci, která bude dosahovat propustnosti 10 Gbps. Několik NAT64 implementací bylo zkoumáno v testovacím prostředí. Měření probíhalo pomocí nástrojů Iperf a PF_Ring. Bylo změřeno několik různých druhů síťového provozu tak, aby bylo z výsledku patrné, jaký výkonnostní dopad má každá z testovaných implementací. Z naměřených výsledků Jool vyšlo jako nejvhodnější NAT64 řešení. Jool splnil požadovanou propustnost a zároveň kromě stále aktivního vývoje nabízí i další pokročilé vlastnosti. Jool byl integrován do routeru NETX. Byla navrhnuta struktura příkazové řádky pro manipulaci s Jool instancí, která byla posléze implementována jako rozšíření NETX příkazové řádky. Dále byl vytvořen postup distribuce potřebných balíčku skrze balíčkovácí systém RPM, tak aby zapadl do automatizovaného systému platformy NETX.Výsledkem práce je plná podpora přechodového mechanismu NAT64 na platformě NETX dosahující propustnosti blízké 10 Gbps.

Master‘s thesis is focused on basic characteristics of data transmissions in computer networks. In forepart I digestedly described basic characteristics computer networks, metods of their measurement and valuation. Computer networks type LAN as well as wireless computer networks Wifi, are mentioned. In second part I realized my own proposition of basic characteristics measurement. This proposition is used for SW applications development. Main goal of these applications is measurement of packet delay, packet jitter, paket loss and available bandwidth. I described details of SW applications and realized measurement of real computer networks in the end.

This master's work deals with the design of laboratory exercises for Cisco Academy courses. Especially is oriented on Cisco technology. The theoretical part describes various devices used in the laboratory and the issue of functionality of these devices, such as switching, routing and solve any problems with the configurations of these elements. The practical part is directly generated designs laboratory exercises, focusing on specific examples of the problems from the configuration and network management with Cisco. An integral part of work consists of supporting the presentation of individual laboratory tasks, including configuration files, settings of the device. Create labs and verify the functionality of their configuration has been realized in the laboratory Cisco Academy Brno.

This diploma thesis is interested in establishment of QoS filtering on IPv6 protocol usány Linux. Thesis describe protocol IPv4 and protocol IPv6 and their differences. Problematic is implement to Linux. Because this problem is implement in Linux, I describe a few distribution of Linux in thesis. Another part of thesis are about QoS and about QoS implement on TCP/IP model. In practise part is make a propsal resolution working site under protocol IPv6 in Linux. Realize include install of server, clients and their configuration. Realize include script, that account, take control of the traffic. Changeing traffic is show in graphs. Graphs of measure are comented and outcome clear up. All graphs and scripts are add to attachments.

This thesis deals with the issues 6LoWPAN protokolu and implementation of IPv6 on the specied platform. Introduction thesis deals with the explanation of wireless sensor networks. Next it was descibed 6LoWPAN protocol, which maps IPv6 on standard IEEE 802.15.4. The thesis further concentrates to exploration of possible operation systems, that are designed for sensor networks and then followed by comparison of their characteristics and advantages. The fth chapter is focused on he implementation of the operating system to the sensor node Iris, introduction Iris and with the structure of the operating system Contiki OS. At the end of thesis is description of the implementation of this system in the sensor node Iris.