{"id":345,"date":"2024-12-16T09:56:38","date_gmt":"2024-12-16T08:56:38","guid":{"rendered":"https:\/\/network360.fr\/?p=345"},"modified":"2025-06-20T15:33:17","modified_gmt":"2025-06-20T13:33:17","slug":"configuration-dhcp-snooping","status":"publish","type":"post","link":"https:\/\/network360.fr\/index.php\/2024\/12\/16\/configuration-dhcp-snooping\/","title":{"rendered":"Configuration &#8211; DHCP Snooping"},"content":{"rendered":"\n<p>Derni\u00e8rement, un client m&rsquo;a demand\u00e9 d&rsquo;augmenter la s\u00e9curit\u00e9 de son r\u00e9seau sur recommandation de l&rsquo;ANSSI (Agence National de la s\u00e9curit\u00e9 des syst\u00e8mes d&rsquo;information).<\/p>\n\n\n\n<p>J&rsquo;ai donc parcouru leur recommandations que vous pouvez retrouver ici : <a href=\"https:\/\/cyber.gouv.fr\/publications\/recommandations-pour-la-securisation-dun-commutateur-de-desserte\">https:\/\/cyber.gouv.fr\/publications\/recommandations-pour-la-securisation-dun-commutateur-de-desserte<\/a><\/p>\n\n\n\n<p>Avant de s\u00e9curiser le DHCP,  petit rappel sur son fonctionnement. <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Pour communiquer, un terminal (PC ou autres) a besoin d&rsquo;une adresse IP. On peut l&rsquo;attribuer statiquement, dynamiquement. <\/p>\n\n\n\n<p>C&rsquo;est le protocole DHCP, ou<strong> Dynamic Host Configuration Protocol<\/strong> qui effectue cette fonction. <\/p>\n\n\n\n<p>Voici son fonctionnement : <\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Le PC demande \u00e0 tout le monde une adresse IP. <\/li>\n\n\n\n<li>Le serveur DHCP lui propose une adresse IP.<\/li>\n\n\n\n<li>Le PC lui r\u00e9pond qu&rsquo;il accepte<\/li>\n\n\n\n<li>Le serveur DHCP valide la r\u00e9servation<\/li>\n<\/ol>\n\n\n\n<p><\/p>\n\n\n\n<p>On conna\u00eet cette \u00e9change sous le nom de <strong>DORA <\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"1024\" height=\"1024\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora.webp\" alt=\"\" class=\"wp-image-349 lazyload\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/1024;width:286px;height:auto\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora.webp 1024w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora-300x300.webp 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora-150x150.webp 150w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora-768x768.webp 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora-600x600.webp 600w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/dora-100x100.webp 100w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p class=\"has-text-align-center\">Non pas cette DORA ! <\/p>\n\n\n\n<p>DORA comme <strong>Discover, Offer, Request, Acknowledge<\/strong><\/p>\n\n\n\n<p>Ci-dessous, voici un \u00e9change classique d&rsquo;une attribution d&rsquo;adresse IP via DHCP. <\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"185\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-3-1024x185.png\" alt=\"\" class=\"wp-image-347 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-3-1024x185.png 1024w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-3-300x54.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-3-768x139.png 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-3-600x109.png 600w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-3.png 1143w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/185;\" \/><\/figure>\n\n\n\n<p>C&rsquo;est comme cela qu&rsquo;un PC r\u00e9cup\u00e8re son adresse IP. <\/p>\n\n\n\n<p><strong><span style=\"text-decoration: underline;\">Discover (D\u00e9couverte) :<\/span><\/strong><\/p>\n\n\n\n<p>Le client envoie une requ\u00eate DHCP Discover en diffusion (broadcast) pour trouver un serveur DHCP disponible.<br>Cette requ\u00eate est envoy\u00e9e \u00e0 l&rsquo;adresse IP de diffusion 255.255.255.255.<\/p>\n\n\n\n<p><strong><span style=\"text-decoration: underline;\">Offer (Offre) :<\/span><\/strong><\/p>\n\n\n\n<p>Un ou plusieurs serveurs DHCP r\u00e9pondent au client avec une offre contenant une adresse IP, les informations de configuration r\u00e9seau (masque de sous-r\u00e9seau, passerelle, DNS, etc.) et une dur\u00e9e de bail (lease time).<\/p>\n\n\n\n<p><strong><span style=\"text-decoration: underline;\">Request (Demande) :<\/span><\/strong><\/p>\n\n\n\n<p>Le client s\u00e9lectionne une offre (g\u00e9n\u00e9ralement la premi\u00e8re re\u00e7ue) et envoie une requ\u00eate DHCP Request pour confirmer son choix et demander l&rsquo;attribution de l&rsquo;adresse IP propos\u00e9e.<\/p>\n\n\n\n<p><strong><span style=\"text-decoration: underline;\">Acknowledge (Accus\u00e9 de r\u00e9ception) :<\/span><\/strong><\/p>\n\n\n\n<p>Le serveur DHCP approuve la demande du client avec un message DHCP Acknowledge. Le client re\u00e7oit ainsi la configuration r\u00e9seau compl\u00e8te et peut commencer \u00e0 utiliser l&rsquo;adresse IP.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-text-align-center\">Ok, \u00e0 quoi va servir le DHCP Snooping alors ? <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n\n\n\n<p>Le <strong>DHCP Snooping<\/strong> est une s\u00e9curit\u00e9 qui bloque les faux serveurs DHCP.<\/p>\n\n\n\n<p>Seuls les ports marqu\u00e9s comme \u00ab\u00a0de confiance\u00a0\u00bb (Trust) peuvent envoyer des r\u00e9ponses DHCP (comme DHCP Offer ou DHCP ACK). Les messages venant d&rsquo;autres ports sont bloqu\u00e9s.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Caract\u00e9ristique du DHCP Snooping : <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Se configure sur chaque switch d&rsquo;extr\u00e9mit\u00e9 (L\u00e0 o\u00f9 il y a des utilisateurs)<\/li>\n\n\n\n<li>Notion de port de confiance <strong>(trust)<\/strong> et de m\u00e9fiance <strong>(untrust)<\/strong><\/li>\n\n\n\n<li>Possibilit\u00e9 de limiter le nombre de paquet DHCP par interface<\/li>\n\n\n\n<li>Fonctionne par VLAN<\/li>\n\n\n\n<li>Tous les ports sont <strong>untrust <\/strong>par d\u00e9faut.<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p>Pour comprendre, il vaut mieux un exemple ! <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p><\/p>\n\n\n\n<p>Voici mon lab ! <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"712\" height=\"662\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-4.png\" alt=\"\" class=\"wp-image-348 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-4.png 712w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-4-300x279.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-4-600x558.png 600w\" data-sizes=\"(max-width: 712px) 100vw, 712px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 712px; --smush-placeholder-aspect-ratio: 712\/662;\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>De bas en haut : <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>PC1 : PC qui va chercher \u00e0 obtenir une adresse IP en DHCP<\/li>\n\n\n\n<li>ROGUE_DHCP : Serveur DHCP \u00ab\u00a0Attaquant\u00a0\u00bb. (<\/li>\n\n\n\n<li>SW1 : Switch d&rsquo;acc\u00e8s <\/li>\n\n\n\n<li>SW_CORE : Switch de coeur <\/li>\n\n\n\n<li>DHCP : \u00ab\u00a0Vrai\u00a0\u00bb serveur DHCP<\/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 has-text-align-center\">Fonctionnement normal (Sans DHCP Snooping)<\/h2>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>PC1 : Je demande une IP\n&gt; sudo udhcpc eth0<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"798\" height=\"196\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-6.png\" alt=\"\" class=\"wp-image-354 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-6.png 798w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-6-300x74.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-6-768x189.png 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-6-600x147.png 600w\" data-sizes=\"(max-width: 798px) 100vw, 798px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 798px; --smush-placeholder-aspect-ratio: 798\/196;\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"795\" height=\"422\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-7.png\" alt=\"\" class=\"wp-image-355 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-7.png 795w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-7-300x159.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-7-768x408.png 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-7-600x318.png 600w\" data-sizes=\"(max-width: 795px) 100vw, 795px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 795px; --smush-placeholder-aspect-ratio: 795\/422;\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Rien de plus simple, j&rsquo;ai r\u00e9cup\u00e9r\u00e9 une adresse IP. <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">DHCP Snooping &#8211; Rogue DHCP<\/h2>\n\n\n\n<p>Voici mon IP si je redemande une IP depuis mon PC. <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"760\" height=\"128\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-14.png\" alt=\"\" class=\"wp-image-394 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-14.png 760w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-14-300x51.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-14-600x101.png 600w\" data-sizes=\"(max-width: 760px) 100vw, 760px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 760px; --smush-placeholder-aspect-ratio: 760\/128;\" \/><\/figure>\n\n\n\n<p>Je r\u00e9cup\u00e8re l&rsquo;adresse IP depuis le serveur 10.10.0.100 qui est&#8230; mon serveur Rogue DHCP ! <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"790\" height=\"118\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-15.png\" alt=\"\" class=\"wp-image-395 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-15.png 790w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-15-300x45.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-15-768x115.png 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-15-600x90.png 600w\" data-sizes=\"(max-width: 790px) 100vw, 790px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 790px; --smush-placeholder-aspect-ratio: 790\/118;\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Maintenant je vais configurer du DHCP Snooping pour s&rsquo;assurer que je ne recois pas d&rsquo;IP d&rsquo;un serveur Rogue.<\/p>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code\">!Activation du DHCP Snooping globalement\n\nip dhcp snooping\n\n!Activation du DHCP Snooping sur le vlan 10\n\nip dhcp snooping vlan 10<\/pre>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"567\" height=\"81\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-9.png\" alt=\"\" class=\"wp-image-357 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-9.png 567w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-9-300x43.png 300w\" data-sizes=\"(max-width: 567px) 100vw, 567px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 567px; --smush-placeholder-aspect-ratio: 567\/81;\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>A partir de ce moment, le switch va bloquer les serveurs DHCP malveillant. <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"1024\" height=\"1024\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver.webp\" alt=\"\" class=\"wp-image-359 lazyload\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/1024;width:416px;height:auto\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver.webp 1024w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver-300x300.webp 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver-150x150.webp 150w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver-768x768.webp 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver-600x600.webp 600w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/roguedhcpserver-100x100.webp 100w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>C&rsquo;est le cas pour notre serveur \u00ab\u00a0ROGUE_DHCP\u00a0\u00bb<\/p>\n\n\n\n<p>Comme je l&rsquo;avais dit pr\u00e9c\u00e9dent, le switch supprime les paquets DHCP type serveurs des interfaces qui ne sont pas de \u00ab\u00a0confiance\u00a0\u00bb. <\/p>\n\n\n\n<p>Le port du serveur \u00ab\u00a0ROGUE_DHCP\u00a0\u00bb ne dispose pas de la commande <em>ip dhcp snooping trust, <\/em>ses paquets DHCP seront supprim\u00e9s.  <\/p>\n\n\n\n<p class=\"has-text-align-center\">Simple comme fonctionnalit\u00e9 non ? <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading has-text-align-center\">DHCP Snooping &#8211; Trust me ! <\/h2>\n\n\n\n<p>Alors oui je l&rsquo;avoue, j&rsquo;ai d\u00e9j\u00e0 fait cette b\u00eatise \u00e0 mes d\u00e9buts !<\/p>\n\n\n\n<p>Dans la partie pr\u00e9c\u00e9dente, j&rsquo;ai activ\u00e9 le DHCP Snooping. Mais j&rsquo;ai oubli\u00e9 de dire d&rsquo;o\u00f9 venait les paquets DHCP de mon vrai serveur ! <\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img decoding=\"async\" width=\"1024\" height=\"1024\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise.webp\" alt=\"\" class=\"wp-image-360 lazyload\" style=\"--smush-placeholder-width: 1024px; --smush-placeholder-aspect-ratio: 1024\/1024;width:350px;height:auto\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise.webp 1024w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise-300x300.webp 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise-150x150.webp 150w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise-768x768.webp 768w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise-600x600.webp 600w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/ratonbetise-100x100.webp 100w\" data-sizes=\"(max-width: 1024px) 100vw, 1024px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" \/><\/figure>\n\n\n\n<p>Croyez-moi, l&rsquo;impact est violent et la panne est sournoise. Toutes nouvelles tentatives de demande d&rsquo;adresse DHCP sera donc supprim\u00e9. Mais, il se peut que vous ne voyez pas le probl\u00e8me de suite. <\/p>\n\n\n\n<p>Dans les entreprises, les baux DHCP peuvent \u00eatre d&rsquo;une dur\u00e9e d&rsquo;un heure, d&rsquo;une journ\u00e9e, d&rsquo;une semaine. Cela veut dire que vous ne verrez le vrai impact qu&rsquo;\u00e0 partir de la fin du bail DHCP. (Autant faire des tests directement avant de partir ) <\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>On va donc dire d&rsquo;o\u00f9 j&rsquo;autorise les paquets DHCP. Bien \u00e9videmment, ca sera de mon lien vers le SW_CORE (mon \u00ab\u00a0uplink\u00a0\u00bb). <\/p>\n\n\n\n<p>Voici la fameuse commande <strong><span style=\"text-decoration: underline;\">(A ne pas oublier)<\/span><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code\">ip dhcp snooping trust<\/pre>\n\n\n\n<p><\/p>\n\n\n\n<p>Voici la configuration de mon \u00ab\u00a0trunk\u00a0\u00bb sur SW1<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"314\" height=\"110\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-12.png\" alt=\"\" class=\"wp-image-363 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-12.png 314w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-12-300x105.png 300w\" data-sizes=\"(max-width: 314px) 100vw, 314px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 314px; --smush-placeholder-aspect-ratio: 314\/110;\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>Si j&rsquo;effectue un autre demande d&rsquo;IP, je recois bien un IP du bon serveur DHCP.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img decoding=\"async\" width=\"755\" height=\"116\" data-src=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-17.png\" alt=\"\" class=\"wp-image-397 lazyload\" data-srcset=\"https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-17.png 755w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-17-300x46.png 300w, https:\/\/network360.fr\/wp-content\/uploads\/2024\/12\/image-17-600x92.png 600w\" data-sizes=\"(max-width: 755px) 100vw, 755px\" src=\"data:image\/svg+xml;base64,PHN2ZyB3aWR0aD0iMSIgaGVpZ2h0PSIxIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPjwvc3ZnPg==\" style=\"--smush-placeholder-width: 755px; --smush-placeholder-aspect-ratio: 755\/116;\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p><span style=\"text-decoration: underline;\">R\u00e9sum\u00e9 des commandes <\/span>:<\/p>\n\n\n\n<pre class=\"wp-block-syntaxhighlighter-code\">!Activation du DHCP Snooping globalement\n\nip dhcp snooping\n\n!Activation du DHCP Snooping sur le vlan 10\n\nip dhcp snooping vlan 10\n\n!Trust sur mon uplink\n\ninterface ethernet0\/1\nip dhcp snooping trust<\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Configuration du DHCP Snooping<\/p>\n","protected":false},"author":1,"featured_media":591,"comment_status":"open","ping_status":"open","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":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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