{"id":152,"date":"2026-08-20T22:05:39","date_gmt":"2026-08-20T22:05:39","guid":{"rendered":"https:\/\/netguide.io\/tools\/mtu-mss-rechner\/"},"modified":"2026-08-20T22:05:39","modified_gmt":"2026-08-20T22:05:39","slug":"mtu-mss-rechner","status":"publish","type":"post","link":"https:\/\/netguide.io\/tools\/de\/mtu-mss-rechner\/","title":{"rendered":"MTU-\/MSS-Rechner"},"content":{"rendered":"<div id=\"netgu-2700383984\" class=\"netgu-before-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"3494115342\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>\n<style>\n.wp-mtu-container { max-width:100%; background:#fff; padding:20px; border:1px solid #ddd; border-radius:10px; font-family:-apple-system, sans-serif; color:#333; }\n.wp-mtu-title { margin:0 0 15px 0; color:#2271b1; font-size:1.4rem; }\n.wp-mtu-grid { display:grid; grid-template-columns:repeat(auto-fit, minmax(140px, 1fr)); gap:12px; margin-bottom:10px; }\n.wp-mtu-input-group label { display:block; font-size:11px; font-weight:bold; margin-bottom:4px; text-transform:uppercase; color:#666; }\n.wp-mtu-input-group input, .wp-mtu-input-group select { width:100%; padding:8px; border:1px solid #ccc; border-radius:4px; box-sizing:border-box; }\n.wp-mtu-checkbox-group { margin:15px 0; font-size:12px; display:flex; align-items:center; gap:8px; color:#666; }\n.wp-mtu-note { font-size:12px; color:#666; margin-top:12px; min-height:1em; }\n.wp-mtu-warn { color:#d63638; font-weight:bold; }\n.wp-mtu-results { margin-top:20px; border-top:2px solid #eee; padding-top:15px; }\n.wp-mtu-res-item { display:flex; justify-content:space-between; margin-bottom:6px; font-size:14px; gap:10px; }\n.wp-mtu-total { font-weight:bold; font-size:18px; color:#2271b1; margin:10px 0; padding:5px 0; border-top:1px solid #eee; border-bottom:1px solid #eee; }\n.wp-mtu-val { color:#2271b1; font-weight:bold; }\n.wp-mtu-out { width:100%; box-sizing:border-box; padding:10px; border:1px solid #ccc; border-radius:4px; font-family:monospace; font-size:13px; word-break:break-all; background:#f7f7f7; margin-top:6px; }\n.wp-mtu-btn { background:#2271b1; color:#fff; border:none; padding:9px 14px; border-radius:4px; cursor:pointer; font-size:13px; margin-top:10px; }\n<\/style><div class=\"wp-mtu-container\">\n  <h3 class=\"wp-mtu-title\">MTU-\/MSS-Rechner<\/h3>\n  <div class=\"wp-mtu-grid\">\n    <div class=\"wp-mtu-input-group\"><label>MTU (Byte)<\/label><input type=\"number\" id=\"mtu-mtu\" value=\"1500\" min=\"0\" step=\"1\" oninput=\"calcMtu()\"><\/div>\n    <div class=\"wp-mtu-input-group\"><label>IP-Version<\/label><select id=\"mtu-ver\" onchange=\"calcMtu()\"><option value=\"4\" selected>IPv4<\/option><option value=\"6\">IPv6<\/option><\/select><\/div>\n    <div class=\"wp-mtu-input-group\"><label>Tunnel\/Overhead<\/label><select id=\"mtu-preset\" onchange=\"mtuSet()\">\n      <option value=\"custom\">Eigener Wert<\/option>\n      <option value=\"0\" selected>Kein Tunnel (0)<\/option>\n      <option value=\"8\">PPPoE (8)<\/option>\n      <option value=\"80\">WireGuard (80)<\/option>\n      <option value=\"73\">IPsec (~73)<\/option>\n      <option value=\"24\">GRE (24)<\/option>\n      <option value=\"50\">VXLAN (50)<\/option>\n    <\/select><\/div>\n    <div class=\"wp-mtu-input-group\"><label>Overhead (Byte)<\/label><input type=\"number\" id=\"mtu-extra\" value=\"0\" min=\"0\" step=\"1\" oninput=\"calcMtu()\"><\/div>\n  <\/div>\n  <div class=\"wp-mtu-results\">\n    <div class=\"wp-mtu-res-item\"><span>Header-Abzug:<\/span><span id=\"mtu-hdr\">\u2014<\/span><\/div>\n    <div class=\"wp-mtu-res-item\"><span>Effektive MTU (nach Tunnel):<\/span><span id=\"mtu-eff\">\u2014<\/span><\/div>\n    <div class=\"wp-mtu-res-item wp-mtu-total\"><span>MSS:<\/span><span id=\"mtu-mss\">\u2014<\/span><\/div>\n  <\/div>\n  <div class=\"wp-mtu-note\">MSS = MTU \u2212 Overhead \u2212 IP-Header \u2212 TCP-Header. Bei Tunneln (VPN, PPPoE) sinkt die nutzbare MTU um den Overhead.<\/div>\n<\/div>\n<script>\nfunction mtuSet(){ var p=document.getElementById('mtu-preset').value; if(p!=='custom'){ document.getElementById('mtu-extra').value=p; } calcMtu(); }\nfunction calcMtu(){\n  var mtu=parseInt(document.getElementById('mtu-mtu').value,10)||0;\n  var ver=document.getElementById('mtu-ver').value;\n  var extra=parseInt(document.getElementById('mtu-extra').value,10)||0;\n  var ipHdr= ver==='6'?40:20; var tcpHdr=20;\n  var eff=mtu-extra; var mss=eff-ipHdr-tcpHdr;\n  document.getElementById('mtu-eff').innerText=eff+' Byte';\n  document.getElementById('mtu-mss').innerText=(mss>0?mss:0)+' Byte';\n  document.getElementById('mtu-hdr').innerText=(ipHdr+tcpHdr)+' Byte ('+ipHdr+' IP + '+tcpHdr+' TCP)';\n}\ncalcMtu();\n<\/script>\n\n\n<div id=\"netgu-4082400881\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- NetGuide.io-After-Widget-Tools -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-6258556257245998\"\r\n     data-ad-slot=\"5175852350\"\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\n\n\n<h2 class=\"wp-block-heading\">So funktioniert der MTU-\/MSS-Rechner<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Die MTU (Maximum Transmission Unit) ist die gr\u00f6\u00dfte Paketgr\u00f6\u00dfe, die eine Verbindung ohne Fragmentierung \u00fcbertr\u00e4gt \u2013 meist 1500 Byte im Ethernet. Die MSS (Maximum Segment Size) ist der Nutzdaten-Anteil eines TCP-Segments und ergibt sich aus der MTU abz\u00fcglich der Header.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Formel:<\/strong> MSS = MTU \u2212 IP-Header \u2212 TCP-Header. IPv4-Header sind 20 Byte, IPv6 40 Byte, der TCP-Header 20 Byte. Bei 1500er-MTU und IPv4 also 1460 Byte MSS.<\/li>\n\n\n<li><strong>Tunnel-Overhead:<\/strong> VPNs und PPPoE verkleinern die nutzbare MTU. WireGuard kostet z. B. rund 60\u201380 Byte, PPPoE 8 Byte.<\/li>\n\n\n<li><strong>Praxis:<\/strong> Passt die MSS nicht, kommt es zu H\u00e4ngern bei gro\u00dfen \u00dcbertragungen \u2013 oft hilft \u201eMSS Clamping&#8221; am Router.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Verwandte Rechner<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"\/tools\/de\/subnetz-ip-rechner\/\">Subnetz- &#038; IP-Rechner<\/a><\/li>\n\n\n<li><a href=\"\/tools\/de\/download-zeit-rechner\/\">Download-Zeit-Rechner<\/a><\/li>\n<\/ul>\n\n\n<div id=\"netgu-3851462085\" class=\"netgu-after-content netgu-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6258556257245998\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-6258556257245998\" \ndata-ad-slot=\"4559785002\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>MSS aus MTU berechnen \u2013 inkl. IPv4\/IPv6-Header und Tunnel-Overhead (PPPoE, WireGuard, IPsec, GRE, VXLAN). L\u00e4uft im Browser.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"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":"default","ast-page-background-enabled":"default","ast-page-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":"","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-4)","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-4)","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-4)","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":[69],"tags":[],"class_list":["post-152","post","type-post","status-publish","format-standard","hentry","category-rechner-calculator"],"brizy_media":[],"_links":{"self":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts\/152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/comments?post=152"}],"version-history":[{"count":0,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/posts\/152\/revisions"}],"wp:attachment":[{"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/media?parent=152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/categories?post=152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/netguide.io\/tools\/wp-json\/wp\/v2\/tags?post=152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}