Pires, Paulo Sérgio da MottaAmaral, Flávio Marcelo Cavalcante Bandeira do2022-09-162022-09-162002AMARAL, Flávio Marcelo Cavalcante Bandeira do. Block uma ferramenta para reconhecimento e bloqueio de ataques a redes de computadores. Orientador: Paulo Sérgio da Motta Pires. 2002. 81 f. Dissertação (Mestrado em Engenharia Elétrica e de Computação) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2002.https://repositorio.ufrn.br/handle/123456789/49352Operating Systems and hosts connected to networks can be a target for attacks. The in- creasing number and frequency of those attacks aimed at Internet connected institutions are very high as well as the risks of steal and the unauthorized access of their Information. The damage can range from a single reading to the modification of proprietary Information. NIDS, NetWork Intrusion Detection Systems, are tools used to detect attacks aimed at Online Systems. In this research, we have developed a tool named Block, which uses a free and open source NIDS to generate Cisco access lists as a response to detected attacks. Beyond authomatically blocking attacks, the developed program sends e-mail messages to the System administrator to notify about the actions taken by the tool.Sistemas operacionaisNetWork Intrusion Detection SystemsAtaques eletrónicosmasterThesisCNPQ::ENGENHARIAS::ENGENHARIA ELETRICA