{"id":222,"date":"2026-05-02T11:17:59","date_gmt":"2026-05-02T09:17:59","guid":{"rendered":"https:\/\/eryann.fr\/?p=222"},"modified":"2026-05-02T14:08:59","modified_gmt":"2026-05-02T12:08:59","slug":"fiche-utilisation-de-ifup-ifdown-debian","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/reseau\/fiche-utilisation-de-ifup-ifdown-debian\/","title":{"rendered":"Fiche utilisation de ifup \/ ifdown (debian)"},"content":{"rendered":"\n<p>Les commandes <code>ifup<\/code> et <code>ifdown<\/code> permettent de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>activer une interface r\u00e9seau<\/li>\n\n\n\n<li>d\u00e9sactiver une interface<\/li>\n\n\n\n<li>appliquer la configuration d\u00e9finie dans <code>\/etc\/network\/interfaces<\/code><\/li>\n<\/ul>\n\n\n\n<p>Elles sont <strong>indispensables en environnement Debian<\/strong> pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>tester une configuration<\/li>\n\n\n\n<li>diagnostiquer un probl\u00e8me r\u00e9seau<\/li>\n\n\n\n<li>appliquer des modifications sans red\u00e9marrer<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image alignfull size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"1024\" src=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/fd9171f9-3ebb-4d0d-8afe-0130ed3d79ea-683x1024.png\" alt=\"\" class=\"wp-image-223\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/fd9171f9-3ebb-4d0d-8afe-0130ed3d79ea-683x1024.png 683w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/fd9171f9-3ebb-4d0d-8afe-0130ed3d79ea-200x300.png 200w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/fd9171f9-3ebb-4d0d-8afe-0130ed3d79ea-768x1152.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/fd9171f9-3ebb-4d0d-8afe-0130ed3d79ea.png 1024w\" sizes=\"auto, (max-width: 683px) 100vw, 683px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Configuration type (rappel)<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code># \/etc\/network\/interfaces<br><br>auto lo<br>iface lo inet loopback<br><br>auto eth0<br>iface eth0 inet dhcp<br><br>auto eth1<br>iface eth1 inet static<br>    address 192.168.10.10<br>    netmask 255.255.255.0<br>    gateway 192.168.10.1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Commandes essentielles<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Activer une interface<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ifup eth0<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">D\u00e9sactiver une interface<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ifdown eth0<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Red\u00e9marrer une interface<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ifdown eth0 &amp;&amp; sudo ifup eth0<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Activer toutes les interfaces<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ifup -a<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">D\u00e9sactiver toutes les interfaces<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo ifdown -a<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Explication d\u00e9taill\u00e9e<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>ifup<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>lit <code>\/etc\/network\/interfaces<\/code><\/li>\n\n\n\n<li>applique la configuration<\/li>\n\n\n\n<li>attribue IP \/ routes \/ DNS<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>ifdown<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>supprime la configuration<\/li>\n\n\n\n<li>d\u00e9sactive l\u2019interface<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Option -a<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>applique \u00e0 toutes les interfaces d\u00e9finies avec <code>auto<\/code><\/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\"><strong>Cycle de fonctionnement<\/strong><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/etc\/network\/interfaces<br>        \u2193<br>Commande ifup \/ ifdown<br>        \u2193<br>Service networking<br>        \u2193<br>Configuration IP \/ routes \/ DNS<br>        \u2193<br>Interface active ou inactive<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Commandes de diagnostic<\/strong><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00e9rifier les interfaces<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ip a<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">V\u00e9rifier le routage<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ip route<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Tester la connectivit\u00e9<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ping 8.8.8.8<br>ping google.com<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Logs r\u00e9seau<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl -u networking<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Cas d\u2019usage concrets<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>appliquer une nouvelle IP sans reboot<\/li>\n\n\n\n<li>tester une configuration r\u00e9seau<\/li>\n\n\n\n<li>couper une interface pour diagnostic<\/li>\n\n\n\n<li>r\u00e9initialiser une connexion<\/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\"><strong>Erreurs fr\u00e9quentes<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>interface non d\u00e9finie dans <code>\/etc\/network\/interfaces<\/code><\/li>\n\n\n\n<li>oubli de <code>auto<\/code><\/li>\n\n\n\n<li>nom d\u2019interface incorrect<\/li>\n\n\n\n<li>conflit avec NetworkManager<\/li>\n\n\n\n<li>interface d\u00e9j\u00e0 active<\/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\"><strong>Bonnes pratiques<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>toujours v\u00e9rifier avec <code>ip a<\/code><\/li>\n\n\n\n<li>tester avec <code>ifdown \/ ifup<\/code> apr\u00e8s modification<\/li>\n\n\n\n<li>\u00e9viter les conflits avec NetworkManager<\/li>\n\n\n\n<li>documenter les interfaces<\/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\"><strong>Fichiers importants<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>\/etc\/network\/interfaces<\/code><\/li>\n\n\n\n<li><code>\/etc\/resolv.conf<\/code><\/li>\n\n\n\n<li><code>\/etc\/hostname<\/code><\/li>\n\n\n\n<li><code>\/etc\/hosts<\/code><\/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\"><strong>Recap<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>ifup<\/code> \u2192 active une interface<\/li>\n\n\n\n<li><code>ifdown<\/code> \u2192 d\u00e9sactive une interface<\/li>\n\n\n\n<li>fonctionne avec <code>\/etc\/network\/interfaces<\/code><\/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\"><strong>Conclusion<\/strong><\/h2>\n\n\n\n<p><code>ifup<\/code> et <code>ifdown<\/code> sont :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>simples<\/li>\n\n\n\n<li>rapides<\/li>\n\n\n\n<li>indispensables en administration r\u00e9seau Debian<\/li>\n<\/ul>\n\n\n\n<p>\u00c0 ma\u00eetriser pour :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>BTS CIEL<\/li>\n\n\n\n<li>BTS SIO<\/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\"><\/h2>\n\n\n\n<p><audio autoplay=\"\"><\/audio><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les commandes ifup et ifdown permettent de : Elles sont indispensables en environnement Debian pour : Configuration type (rappel) Commandes essentielles Activer une interface D\u00e9sactiver une interface Red\u00e9marrer une interface Activer toutes les interfaces D\u00e9sactiver toutes les interfaces Explication d\u00e9taill\u00e9e ifup ifdown Option -a Cycle de fonctionnement Commandes de diagnostic V\u00e9rifier les interfaces V\u00e9rifier le [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","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 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[12,10],"tags":[],"class_list":["post-222","post","type-post","status-publish","format-standard","hentry","category-linux","category-reseau"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fiche utilisation de ifup \/ ifdown (debian) - Eryann Breizh SecOps<\/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:\/\/eryann.fr\/index.php\/reseau\/fiche-utilisation-de-ifup-ifdown-debian\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche utilisation de ifup \/ ifdown 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