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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Uma arquitetura P2P baseada na hierarquia do endere?amento IP com roteamento unificado

Pinheiro, Marcos Cesar Madruga Alves 20 February 2006 (has links)
Made available in DSpace on 2014-12-17T14:55:03Z (GMT). No. of bitstreams: 1 MarcosCMAP.pdf: 634837 bytes, checksum: 4a0393d7f7dbe297fda66b1ed1859c99 (MD5) Previous issue date: 2006-02-20 / There are some approaches that take advantage of unused computational resources in the Internet nodes - users? machines. In the last years , the peer-to-peer networks (P2P) have gaining a momentum mainly due to its support for scalability and fault tolerance. However, current P2P architectures present some problems such as nodes overhead due to messages routing, a great amount of nodes reconfigurations when the network topology changes, routing traffic inside a specific network even when the traffic is not directed to a machine of this network, and the lack of a proximity relationship among the P2P nodes and the proximity of these nodes in the IP network. Although some architectures use the information about the nodes distance in the IP network, they use methods that require dynamic information. In this work we propose a P2P architecture to fix the problems afore mentioned. It is composed of three parts. The first part consists of a basic P2P architecture, called SGrid, which maintains a relationship of nodes in the P2P network with their position in the IP network. Its assigns adjacent key regions to nodes of a same organization. The second part is a protocol called NATal (Routing and NAT application layer) that extends the basic architecture in order to remove from the nodes the responsibility of routing messages. The third part consists of a special kind of node, called LSP (Lightware Super-Peer), which is responsible for maintaining the P2P routing table. In addition, this work also presents a simulator that validates the architecture and a module of the Natal protocol to be used in Linux routers / Entre as diversas abordagens para se aproveitar os recursos computacionais ociosos existentes nas folhas da Internet, ou seja, nas m?quinas dos usu?rios, as redes peer-to-peer (P2P) v?m ganhando destaque especial nos ?ltimos anos devido principalmente ? sua escalabilidade, desempenho e toler?ncia ? falhas. As arquiteturas P2P atuais, entretanto, ainda apresentam alguns problemas como a sobrecarga nos n?s devido ? realiza??o do roteamento de mensagens, o n?mero elevado de n?s reconfigurados devido ? mudan?as de topologia da rede, a exist?ncia de tr?fego de roteamento dentro das redes das organiza??es que n?o ? destinado a nenhuma de suas m?quinas e ? aus?ncia de rela??o entre a proximidade dos n?s na rede P2P e a proximidade desses n?s na rede IP. Embora algumas arquiteturas considerem essas dist?ncias na rede IP, o fazem atrav?s de m?todos que requerem a troca de informa??es constantemente. Nesse trabalho n?s propomos uma arquitetura P2P para resolver os problemas citados. Essa arquitetura ? composta por tr?s partes. A primeira parte consiste em uma arquitetura P2P b?sica, chamada SGrid, que mant?m a rela??o dos n?s na rede P2P com suas posi??es na rede IP e atribui regi?es de chaves adjacentes para n?s de uma mesma organiza??o. A segunda parte consiste em um protocolo chamado NATal (Routing and NAT application layer) que estende a arquitetura b?sica para retirar dos n?s a fun??o de roteamento de mensagens. A terceira parte consiste de um tipo especial de n?, chamado LSP (Lightware Super-Peer), que ? o respons?vel pela manuten??o das tabelas de roteamento P2P. Al?m da descri??o da arquitetura proposta e da especifica??o dos protocolos SGrid e NATal, esse trabalho apresenta o simulador desenvolvido para validar a arquitetura e um m?dulo para ser utilizado em roteadores Linux que implementa o protocolo Natal

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