Sistema de Controlo de Tráfego de um Dispositivo de Fronteira Multi-Serviço



Small and medium size networks with access to the Internet are each day more common in SOHO (Small Office/Home Office) environments, comprising domestic and small to medium size organizations. Inherent to the spread of these networks is the search for small access devices that allow the connection to the Internet in a very user friendly way but with a growing number of offered services, comprising basic IP functionalities, mobility, security and traffic control services. Traditionally, these services are available in dedicated and proprietary devices, with complex integration and high cost. More recently, new products appeared in the market that integrate several services in a single device. However, these products are still complex to manage and still have medium to high cost.
To overcome an open space in the market, the Communications and Telematics Group from the University of Coimbra and Critical Software S.A. developed a multi-service edge device, the Edge Device, that offers basic and advanced IP services at low cost and with trivial management requirements.
This dissertation presents the work done in the conception, development and evaluation of one of the key components of this Edge Device, the traffic control system. Particularly, it presents a solution for the DiffServ-based modeling of upstream and downstream traffic in a single Linux router that is also an authentication, NAT (network address translation), firewall, service provider and application gateway machine.
The results obtained in system's unit testing, and in production environment, show that the proposed solution for traffic control is indeed well fitted and effective in the management of the access badwidth in SOHO environments.



MSc Thesis

Sistema de Controlo de Tráfego de um Dispositivo de Fronteira Multi-Serviço, October 2004

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