{"id":64170,"date":"2026-06-11T16:47:38","date_gmt":"2026-06-11T09:47:38","guid":{"rendered":"https:\/\/vhost.vn\/why-vhost-blocks-icmp-and-udp-and-how-to-verify-network-connectivity\/"},"modified":"2026-06-12T08:53:18","modified_gmt":"2026-06-12T01:53:18","slug":"why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity","status":"publish","type":"post","link":"https:\/\/vhost.vn\/en\/why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity\/","title":{"rendered":"Why vHost permanently blocks ICMP protocol and how to verify network connectivity"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/vhost.vn\/en\/why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity\/#1_Attack_Mechanisms\" >1. Attack Mechanisms<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/vhost.vn\/en\/why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity\/#2_Consequences\" >2. Consequences<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/vhost.vn\/en\/why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity\/#3_Verifying_Connectivity_via_TCP\" >3. Verifying Connectivity via TCP<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/vhost.vn\/en\/why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity\/#4_Note_for_Monitoring_Systems\" >4. Note for Monitoring Systems<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading has-medium-font-size\"><span class=\"ez-toc-section\" id=\"1_Attack_Mechanisms\"><\/span><strong>1. Attack Mechanisms<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">vHost permanently blocks the ICMP protocol as it represents one of the most prevalent attack vectors in DDoS campaigns. Attackers continuously transmit millions of ICMP Echo Request packets, exhausting available bandwidth and causing CPU spikes as the kernel is required to process each packet individually. <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h1 class=\"wp-block-heading has-medium-font-size\"><span class=\"ez-toc-section\" id=\"2_Consequences\"><\/span><strong>2. Consequences<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tools relying on <code class=\"\" data-line=\"\">ping<\/code>such as ping and <code class=\"\" data-line=\"\">mtr<\/code>will receive no response <\/li>\n\n\n\n<li>Monitoring systems using ICMP ping checks will generate false positives (reporting down while the server is actually running normally)<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h1 class=\"wp-block-heading has-medium-font-size\"><span class=\"ez-toc-section\" id=\"3_Verifying_Connectivity_via_TCP\"><\/span><strong>3. Verifying Connectivity via TCP<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">Since ICMP is blocked at the network layer, internet connectivity must be verified through the TCP protocol.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Verification Commands:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"\" data-line=\"\">curl -4 ifconfig.me # Check IPv4<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code class=\"\" data-line=\"\">curl -6 ifconfig.me # Check IPv6<\/code><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">If the command returns a public IP address, the server is operating normally and has internet connectivity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h1 class=\"wp-block-heading has-medium-font-size\"><span class=\"ez-toc-section\" id=\"4_Note_for_Monitoring_Systems\"><\/span><strong>4. Note for Monitoring Systems<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">If your monitoring system is currently using ICMP ping checks, it must be switched to TCP checks to avoid false positive alerts.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>1. Attack Mechanisms vHost permanently blocks the ICMP protocol as it represents one of the most prevalent attack vectors in DDoS campaigns. Attackers continuously transmit millions of ICMP Echo Request packets, exhausting available bandwidth and causing CPU spikes as the kernel is required to process each packet individually. 2. Consequences 3. Verifying Connectivity via TCP [&hellip;]<\/p>\n","protected":false},"author":107,"featured_media":64183,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[479,118],"tags":[],"class_list":["post-64170","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bao-mat","category-news"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why vHost permanently blocks ICMP protocol and how to verify network connectivity - vHost<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/vhost.vn\/en\/why-vhost-permanently-blocks-icmp-and-how-to-verify-network-connectivity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why vHost permanently blocks ICMP protocol and how to verify network connectivity - vHost\" \/>\n<meta property=\"og:description\" content=\"1. Attack Mechanisms vHost permanently blocks the ICMP protocol as it represents one of the most prevalent attack vectors in DDoS campaigns. Attackers continuously transmit millions of ICMP Echo Request packets, exhausting available bandwidth and causing CPU spikes as the kernel is required to process each packet individually. 2. Consequences 3. 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