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The objective of this project was to design and test a secure IP-based architecture suitable for short duration transactions. This included the development of a prototype test-bed in which various operating scenarios (such as cryptographic options, various IP-based architectures and fault tolerance) were demonstrated. A solution based on SIP secured with TLS was tested on two IP based architectures. Total time, CPU time and heap usage was measured for each architecture and encryption scheme to examine the viability of such a solution. The results showed that the proposed solution stack was able to complete transactions in reasonable time and was able to recover from transaction processor failure. This research has demonstrated a possible architecture and protocol stack suitable for IP-based transaction networks. The benefits of an IP-based transaction network include reduced operating costs for network providers and clients, as shared IP infrastructure is used, instead of maintaining a separate IP and X.25 network.

Diss. (sammanfattning) Sundsvall : Mittuniversitetet, 2008. / Härtill 5 uppsatser.

Techn. University, Diss., 2004--Berlin.

Computers are becoming smaller and more mobile, as they do they are becoming relied upon more and more for critical applications. These applications require an always on high bandwidth connection from the field to the internet. It is this reason that techniques must be developed. In a system where a mobile router chooses amongst several differing types of networks, the router must be given as much information as possible so that it can make the best choice as to who it should connect to when it leaves its home network. This paper proposes that the mobile router be given a metric, called dynamic preference level, based upon the conditions of each possible next hop so that when the router needs to handoff from one access point to another it makes the best, informed, decision it can. This metric will use the amount of free bandwidth available in addition to other factors such as path loss.

Made available in DSpace on 2014-06-12T17:35:33Z (GMT). No. of bitstreams: 2 arquivo2470_1.pdf: 6699219 bytes, checksum: f7ab13c2c0f61e4dfa1c822d8756767a (MD5) license.txt: 1748 bytes, checksum: 8a4605be74aa9ea9d79846c1fba20a33 (MD5) Previous issue date: 2011 / O aumento da demanda pela utilização de novos serviços de valor agregado sobre as infraestruturas de rede baseadas no protocolo IP (Internet Protocol), tais como voz e vídeo, contribui para que as operadoras de telecomunicações enfrentem um grande desafio para prover um backbone estável, escalável e otimizado, para atender satisfatoriamente essas novas expectativas de tráfego dos seus clientes. As empresas de telecomunicações buscam uma rede com uma maior disponibilidade e menor custo. A tecnologia MPLS (Multi-Protocol Label Switching) é indicada para prover evolução, otimização e flexibilidade aos backbones atuais, mostrando-se uma tecnologia emergente a ser empregada nessas redes. O novo paradigma de transporte baseado no MPLS permite as operadoras de telecomunicações construírem, sobre as infraestruturas IP, ATM (Asynchronous Transfer Mode) e Frame Relay, um conjunto de soluções criativas e flexíveis para suprir essa nova demanda de serviços. Dentre esses serviços, destacam-se a oferta de Internet e VPN (Virtual Private Network) na rede da operadora apoiada pela implementação de uma arquitetura com QoS (Quality of Service) e satisfazendo os requisitos de TE (Traffic Engineering) sobre MPLS. Esta dissertação apresenta a engenharia de tráfego aplicada a backbone IP MPLS de uma operadora de telecomunicações, com a aplicação prática do MPLS-TE (Multi-Protocol Label Switching Traffic Engineering), analisando e otimizando os recursos de transmissão com caminhos redundantes não utilizados pelo protocolo OSPF (Open Shortest Path First)

O projeto VoIPFix surgiu da necessidade de uma ferramenta que complementasse as demais existentes no ramo de análise de redes de computadores para telefonia IP. Ele foi construído para ser uma ferramenta de gerenciamento eficiente e exclusiva para VoIP, com funcionalidades necessárias para dar suporte ao profissional de rede de computadores e telefonia IP a observar e diagnosticar problemas de VoIP. / The VoIPFix project arose from the need for a tool to complement similar tools in the analysis of computer networks for IP telephony. It was built to be an efficient and unique management tool for VoIP, with advanced features required to support the computer network and IP telephony professionals to observe and diagnose problems related to VoIP.

With a rapid growth in wireless technology in recent years, Mobile IP has become very important for consumers and businesses by providing mobility based on IP addresses using several applications, which keep the employees connected with each others with critical information. In mobile IP the node can change its location by maintaining the same IP address and keep connected to the internet, which solves the issue of terminating the communication once it moves. Since Mobile IP uses open airwaves as a transmission medium, it is subject to the many security threats that are routed in mobile IP network .Protecting mobile IP from threats and attacks is one of the most challenging task now days. IPSec is a standard security protocol solution for TCP/IP network that provides security through Authentication, Encryption and data integrity services. Mobile IP data traffic can be secured by combining with IP Security (IPSec) protocol. This thesis describes Mobile IP operations, security threats, different existing methods for securing mobile IP and then IPSec standard, how it works and why IPSec is the best solution. This thesis also describes how to combine IPSec with a mobile IP to provide a solution called (SecMIP) that protects the mobile device’s communication from any threats. Finally it describes Mobile IPv6, binding update and associated security concern.

This thesis is focused on collecting data from commercial geolocation databases and its analysis. The theoretical part discusses techniques of IP geolocation, briefly describes commercial geolocation databases and mechanisms for accessing their geolocation services. The practical part of this thesis involves implementation of scripts for collecting and modification data retrieved from commercial geolocation databases for further analysis. First script collects the data and store them in output files in specified format. Second script modifies gathered data to achieve better accuracy. Detailed analysis is performed afterwards. Analysis is performed at several levels. This includes country, region and city accuracy as well as accuracy on latitude and longitude parameters. Output of this analysis will be conclusive, and will also display accuracy of tested geolocation services. The aim of this thesis is to analyze currently available commercial geolocation services and to prove their accuracy. Used scripts are implemented in Python programming language in version 3 using modules urllib, re and json. Scripts are test on commodity hardware with Linux operating system.

La quantité de données devant être transportée via les réseaux de cœur croit de près de 25% par an. Pour maîtriser les coûts, les différentes couches du réseau doivent mettre des informations en commun pour inclure de plus en plus de paramètres lors du dimensionnement du réseau. Cela s’appelle « dimensionnement multicouche ». Nous étudions le dimensionnement multicouche de réseaux statiques composés de deux couches utilisant la commutation en mode circuit (typiquement IP-sur-WDM). Nous proposons un modèle semi-analytique expliquant le comportement des algorithmes responsables de l’agrégation et du routage dans les deux couches. Ce cadre théorique permet de comparer les algorithmes de dimensionnement multicouche entre eux, mais aussi d’expliquer et d’améliorer leur efficience. Nous décrivons ensuite comment la contrainte de portée optique affecte les résultats d’un algorithme de dimensionnement multicouche. Enfin, nous expliquons comment ces résultats s'appliquent au dimensionnement des réseaux de nouvelle génération (dynamiques et hétérogènes en capacité optique) / The traffic passing through core networks grows by nearly 25% each year. To bring the costs under control, the different network layers of the network should work together to include more and more parameters during the network planning phase. This is called “multilayer network planning”. We study the multilayer network planning of static networks composed of two circuit switched layers (typically IP-over-WDM). We propose a semi-analytical model explaining the behavior of algorithms responsible for aggregation and routing in both layers. This theory allows comparing multilayer planning algorithms between them, but also explaining and enhancing their efficiency. We then describe the impact of the optical reach constraint in WDM networks on the results of a multilayer planning algorithm. Finally, we explain how these results apply to the design of future networks (dynamic and with heterogeneous optical layers)