April 2025
Intermediate to advanced
264 pages
6h 43m
Portuguese (Portugal, Brazil)
Content preview from Guia de pacotes para protocolos de rede principaisBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Capítulo 6. Protocolo de mensagens de controlo da Internet
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"As mensagens de erro ICMP assinalam condições de erro de rede encontradas durante o processamento de um datagramada Internet. Dependendo do cenário específico, as condições de erro comunicadas podem ou não ser resolvidas a curto prazo."
RFC 4443
O Internet Control Message Protocol (ICMP) fornece mensagens de erro e feedback durante as operações de rede. Estas mensagens fornecem informações sobre o estado atual da rede, tornando mais simples a resolução de problemas de conetividade da rede. Uma mensagem de erro ICMP é frequentemente enviada em resposta a uma tentativa de transmissão falhada. Além disso, as mensagens ICMP nos permitem pedir informações à rede. Este capítulo explicará o ICMP através de uma análise detalhada de vários dos tipos de mensagens mais comuns e das condições que as causam. As ferramentas básicas usadas aqui incluem capturas do Wireshark, a saída do shell de comando do Windows (DOS) e a saída vista de um roteador Cisco.
A RFC 792 define vários tipos de mensagens ICMP e constitui a base da nossa discussão. As redes contemporâneas utilizam normalmente um punhado destes tipos de mensagens para lidar com questões padrão. Várias outras RFCs contribuíram para o ICMP, a maioria delas projetada para lidar com situações muito particulares. Uma lista dessas RFCs está incluída no final do capítulo. ...
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