Plataforma para o estudo de mobilidade na camada de rede
Autor
Cleiber Marques da Silva Filipe Medeiros de Almeida
Resumo
A investigação de tecnologias que possibilitam a mobilidade de terminais no âmbito da Internet vem ganhando um grande espaço na comunidade científica. As soluções de mobilidade na camada de rede, tal como o IPv6 Móvel e seus derivados, apresentam-se como uma forma transparente e elegante de tratar o deslocamento de um nó móvel entre sub-redes. Neste trabalho, descreve-se a implementação de uma plataforma de testes baseada em máquinas virtuais UML, com fins de facilitar os estudos dos referidos protocolos, mais especificamente do IPv6 móvel e IPv6 móvel hierárquico. Visto a ausência de um código recente deste último, também foi implementada uma versão experimental do IP Móvel Hierárquico. Como contribuição adicional, são apresentadas análises preliminares do funcionamento e desempenho dos protocolos estudados, a partir de cenários de testes realizados sobre a plataforma.
Palavras chave
IP Móvel, IP Móvel Hierárquico, IP Móvel para o Linux, Linux Modo Usuário, Plataforma de Testes.
Abstract
The investigation of technologies that enable the mobility of terminals in the Internet has gained a large space in the scientific community. The solutions for mobility in the network layer, such as Mobile IPv6 and its derivatives, appear as a transparent and elegant way to deal with the displacement of a mobile node between subnets. This work describes the implementation of a test platform based on UML virtual machines with the purpose of facilitating studies of these protocols, specifically the Mobile IPv6 and the Hierarchical Mobile IPv6. The lack of an updated code for the last one motivated an implementation of a experimental version of the Hierarchical Mobile IP. As an additional contribution, it is discussed preliminary results on the operation and performance of the studied protocols, extracted from test scenarios performed on the platform. This work will explore the NSIS signaling protocol, considered as a substitute for RSVP, showing its characteristics, applications and advantages. The NSIS is still being discussed in the IETF and it has a few experimental implementations. The mechanisms of the NSIS are exploited through the construction of scenarios in virtual machines, using a real implementation of the University of Goettingen. Among other features, it is shown the traces of reservation messages down and upstream to the data flow. In addition, a scenario shows the resource reservation carried out by a resource management function. As an additional contribution, it was made a first study of an implementation of NSIS aiming to test the feasibility of the some mechanisms extensions for use in diffserv models.
Keywords
Mobile IP, Mobile IP Hierarchical, Mobile IP for Linux, User Mode Linux, Platform of tests.