{"id":3418,"date":"2026-02-19T10:00:00","date_gmt":"2026-02-19T13:00:00","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=3418"},"modified":"2026-04-28T20:03:07","modified_gmt":"2026-04-28T23:03:07","slug":"perda-de-pacotes-linux-mtr-tcpdump-iftop","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/perda-de-pacotes-linux-mtr-tcpdump-iftop\/","title":{"rendered":"Diagn\u00f3stico de Perda de Pacotes no Linux com mtr, tcpdump e iftop"},"content":{"rendered":"<div id=\"helps-3144177303\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<p class=\"wp-block-paragraph\">A <strong>perda de pacotes no <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">Linux<\/a><\/strong> \u00e9 um dos problemas mais cr\u00edticos em ambientes de produ\u00e7\u00e3o. Ela pode causar lentid\u00e3o intermitente, timeout em APIs, TTFB elevado e instabilidade em conex\u00f5es SSH.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neste guia t\u00e9cnico voc\u00ea vai aprender como identificar perda de pacotes utilizando tr\u00eas ferramentas essenciais:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>mtr \u2013 An\u00e1lise de rota e lat\u00eancia<\/li>\n\n\n\n<li>tcpdump \u2013 Captura e inspe\u00e7\u00e3o de pacotes<\/li>\n\n\n\n<li>iftop \u2013 Monitoramento de banda em tempo real<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-o-que-e-perda-de-pacotes\">O que \u00e9 perda de pacotes?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Perda de pacotes ocorre quando dados enviados por um dispositivo n\u00e3o chegam ao destino final. Em servidores Linux isso pode ocorrer por:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Satura\u00e7\u00e3o de banda<\/li>\n\n\n\n<li>Problemas na operadora<\/li>\n\n\n\n<li>Firewall mal configurado<\/li>\n\n\n\n<li>Ataques leves (DDoS)<\/li>\n\n\n\n<li>Limites de PPS em VPS<\/li>\n\n\n\n<li>Problemas f\u00edsicos de rede<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Os sintomas mais comuns incluem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sites carregando parcialmente<\/li>\n\n\n\n<li>APIs retornando erro 504<\/li>\n\n\n\n<li>Ping inst\u00e1vel<\/li>\n\n\n\n<li>Aumento repentino de TTFB<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"h-como-diagnosticar-perda-de-pacotes-no-linux\">Como diagnosticar perda de pacotes no Linux<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-1-usando-mtr-para-identificar-onde-ocorre-a-perda\">1\ufe0f\u20e3 Usando mtr para identificar onde ocorre a perda<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O <code>mtr<\/code> combina funcionalidades de <code>ping<\/code> e <code>traceroute<\/code>, mostrando lat\u00eancia e perda em cada salto da rota.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-instalacao\">Instala\u00e7\u00e3o<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre># Debian\/Ubuntu\napt install mtr\n\n# AlmaLinux\/CentOS\ndnf install mtr\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-comando-recomendado\">Comando recomendado<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>mtr -rwzbc 100 seu-dominio.com\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-como-interpretar-o-resultado\">Como interpretar o resultado<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Perda no primeiro hop \u2192 problema local<\/li>\n\n\n\n<li>Perda nos hops intermedi\u00e1rios \u2192 problema no provedor<\/li>\n\n\n\n<li>Perda apenas no destino \u2192 poss\u00edvel limita\u00e7\u00e3o do servidor remoto<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f Aten\u00e7\u00e3o: se um hop mostra perda mas os seguintes n\u00e3o mostram, pode ser apenas rate limit de ICMP.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-2-usando-tcpdump-para-analise-profunda\">2\ufe0f\u20e3 Usando tcpdump para an\u00e1lise profunda<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Se o <code>mtr<\/code> indicar instabilidade, o pr\u00f3ximo passo \u00e9 capturar pacotes com o <code>tcpdump<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-capturar-trafego-da-interface\">Capturar tr\u00e1fego da interface<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>tcpdump -i eth0\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-filtrar-por-ip-especifico\">Filtrar por IP espec\u00edfico<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>tcpdump -i eth0 host 1.2.3.4\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-filtrar-por-porta-https\">Filtrar por porta HTTPS<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>tcpdump -i eth0 port 443\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-capturar-para-analise-posterior\">Capturar para an\u00e1lise posterior<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>tcpdump -i eth0 -w captura.pcap\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Indicadores de perda TCP:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Retransmission<\/li>\n\n\n\n<li>Dup ACK<\/li>\n\n\n\n<li>Out of order<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Esses eventos indicam retransmiss\u00f5es causadas por perda real de pacotes.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-3-usando-iftop-para-detectar-congestionamento\">3\ufe0f\u20e3 Usando iftop para detectar congestionamento<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">O <code>iftop<\/code> mostra consumo de banda em tempo real.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-instalacao-0\">Instala\u00e7\u00e3o<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>apt install iftop\ndnf install iftop\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-executando\">Executando<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>iftop -i eth0\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Se o link estiver constantemente pr\u00f3ximo do limite contratado, a perda pode ser causada por satura\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cen\u00e1rios comuns:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Backup rodando em hor\u00e1rio comercial<\/li>\n\n\n\n<li>Sincroniza\u00e7\u00f5es rsync pesadas<\/li>\n\n\n\n<li>Ataques de baixa intensidade<\/li>\n\n\n\n<li>Cache miss em massa<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"h-diagnostico-pratico-passo-a-passo\">Diagn\u00f3stico pr\u00e1tico passo a passo<\/h1>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-passo-1-teste-externo\">Passo 1 \u2013 Teste externo<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Execute mtr a partir de outro servidor para seu IP.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-passo-2-teste-interno\">Passo 2 \u2013 Teste interno<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Teste do servidor para o gateway local.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-passo-3-verifique-uso-de-banda\">Passo 3 \u2013 Verifique uso de banda<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Use iftop para detectar satura\u00e7\u00e3o.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-passo-4-confirme-retransmissoes\">Passo 4 \u2013 Confirme retransmiss\u00f5es<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Capture pacotes com tcpdump.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"h-comandos-extras-para-analise-avancada\">Comandos extras para an\u00e1lise avan\u00e7ada<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Ver erros na interface:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>ip -s link show eth0\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Ver estat\u00edsticas da placa:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>ethtool -S eth0\n<\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Ver retransmiss\u00f5es TCP:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>netstat -s | grep -i retrans\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"h-causas-comuns-de-perda-de-pacotes-em-vps\">Causas comuns de perda de pacotes em VPS<\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Overselling de rede<\/li>\n\n\n\n<li>Limite de PPS do hypervisor<\/li>\n\n\n\n<li>IRQ mal distribu\u00edda<\/li>\n\n\n\n<li>Offloading mal configurado<\/li>\n\n\n\n<li>Firewall bloqueando excessivamente<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"h-conclusao\">Conclus\u00e3o<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Diagnosticar <strong>perda de pacotes no Linux<\/strong> exige abordagem estruturada:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Primeiro identifique a rota com mtr<\/li>\n\n\n\n<li>Depois verifique satura\u00e7\u00e3o com iftop<\/li>\n\n\n\n<li>Por fim confirme comportamento real com tcpdump<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Essa metodologia reduz tempo de troubleshooting e permite abrir chamados t\u00e9cnicos com evid\u00eancias claras.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1771265511755\"><strong class=\"schema-faq-question\">O que causa perda de pacotes em servidores Linux?<\/strong> <p class=\"schema-faq-answer\">Normalmente congestionamento, problemas na operadora, firewall mal configurado ou limita\u00e7\u00e3o do provedor VPS.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771265537715\"><strong class=\"schema-faq-question\">Como saber se a perda \u00e9 interna ou externa?<\/strong> <p class=\"schema-faq-answer\">Use mtr. Se a perda ocorre no primeiro hop, \u00e9 problema local.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771265557629\"><strong class=\"schema-faq-question\">Perda de pacotes sempre significa problema?<\/strong> <p class=\"schema-faq-answer\">N\u00e3o. Alguns roteadores limitam resposta ICMP, gerando falso positivo.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1771265582982\"><strong class=\"schema-faq-question\">Como evitar perda de pacotes?<\/strong> <p class=\"schema-faq-answer\">Monitoramento cont\u00ednuo, QoS adequado, upgrade de link e configura\u00e7\u00e3o correta de firewall.<\/p> <\/div> <\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-veja-mais\"><strong>Veja Mais:<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/helpsysadmin.com.br\/blog\/cloudlinux-lve-manager-limitar-cpu-ram\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>CloudLinux LVE Manager: Como Limitar CPU e RAM<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/helpsysadmin.com.br\/blog\/mailcow-docker-vale-a-pena\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Mailcow Docker: Vale a Pena Rodar E-mail Pr\u00f3prio? An\u00e1lise Completa<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-identificar-consumo-excessivo-de-recursos\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Como identificar consumo excessivo de recursos por conta no servidor Linux<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/helpsysadmin.com.br\/blog\/testar-velocidade-da-internet-do-servidor-linux-com-speedtest-cli\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Como testar a velocidade da internet do servidor linux com speedtest-cli<\/strong><\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-interpretar-logs-linux\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Como Interpretar Logs do Linux: Guia Completo para Sysadmins<\/strong><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A perda de pacotes no Linux \u00e9 um dos problemas mais cr\u00edticos em ambientes de produ\u00e7\u00e3o. Ela pode causar lentid\u00e3o intermitente, timeout [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":3484,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4187],"tags":[2996,3571,2712,2852,3577,3569,3573,2422,3575,209],"class_list":["post-3418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monitoramento-e-troubleshooting","tag-diagnostico-de-rede","tag-iftop","tag-infraestrutura","tag-latencia","tag-monitoramento-de-rede","tag-mtr","tag-packet-loss","tag-tcpdump","tag-troubleshooting-linux-5","tag-vps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.9 (Yoast SEO v27.9) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Diagn\u00f3stico de Perda de Pacotes no Linux com mtr,tcpdump,iftop<\/title>\n<meta name=\"description\" content=\"Aprenda como diagnosticar perda de pacotes no Linux usando mtr, tcpdump e iftop. 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