{"id":275,"date":"2026-05-03T15:50:23","date_gmt":"2026-05-03T13:50:23","guid":{"rendered":"https:\/\/eryann.fr\/?p=275"},"modified":"2026-05-03T16:15:48","modified_gmt":"2026-05-03T14:15:48","slug":"fiche-pat-avec-cisco-ios-port-forwarding-translation-dmz","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/cisco\/fiche-pat-avec-cisco-ios-port-forwarding-translation-dmz\/","title":{"rendered":"Fiche PAT avec Cisco ios (port forwarding\/translation + dmz)"},"content":{"rendered":"\n<p>Cette fiche pr\u00e9sente la mise en \u0153uvre d\u2019un PAT (Port Address Translation) avec Cisco IOS pour publier un serveur web situ\u00e9 en DMZ vers Internet.<br>Elle est adapt\u00e9e aux \u00e9tudiants en BTS CIEL ou SIO et constitue une base classique en administration r\u00e9seau.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"738\" src=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/e33ec5e5-b4ab-4018-b925-24ae9ec5f6ee-1024x738.png\" alt=\"\" class=\"wp-image-276\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/e33ec5e5-b4ab-4018-b925-24ae9ec5f6ee-1024x738.png 1024w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/e33ec5e5-b4ab-4018-b925-24ae9ec5f6ee-300x216.png 300w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/e33ec5e5-b4ab-4018-b925-24ae9ec5f6ee-768x554.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/e33ec5e5-b4ab-4018-b925-24ae9ec5f6ee.png 1477w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Topologie<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>INTERNET (WAN)<br>      |<br>  &#91;Routeur]<br>   |     |<br> LAN    DMZ<br>        |<br>     Serveur Web<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Plan d\u2019adressage<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>WAN : 16.0.0.1\/24<br>LAN : 192.168.1.0\/24<br>DMZ : 192.168.10.0\/24<br><br>Serveur Web : 192.168.10.10<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Configuration<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Interfaces<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>interface g0\/0<br>description WAN<br>ip address 16.0.0.1 255.255.255.0<br>ip nat outside<br>no shutdown<br><br>interface g0\/1<br>description LAN<br>ip address 192.168.1.1 255.255.255.0<br>ip nat inside<br>no shutdown<br><br>interface g0\/2<br>description DMZ<br>ip address 192.168.10.1 255.255.255.0<br>ip nat inside<br>no shutdown<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">PAT dynamique (acc\u00e8s Internet)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>access-list 1 permit 192.168.1.0 0.0.0.255<br>access-list 1 permit 192.168.10.0 0.0.0.255<br><br>ip nat inside source list 1 interface g0\/0 overload<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Redirection de ports (PAT statique)<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>ip nat inside source static tcp 192.168.10.10 80 16.0.0.1 80<br>ip nat inside source static tcp 192.168.10.10 443 16.0.0.1 443<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e9rification<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>show ip nat translations<br>show ip nat statistics<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Tests<\/h2>\n\n\n\n<p>Depuis un poste externe :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>curl http:\/\/16.0.0.1<br>curl https:\/\/16.0.0.1<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Explication<\/h2>\n\n\n\n<p>Le PAT dynamique permet aux r\u00e9seaux LAN et DMZ d\u2019acc\u00e9der \u00e0 Internet en utilisant l\u2019adresse IP du routeur.<\/p>\n\n\n\n<p>Le PAT statique permet de rediriger des connexions entrantes depuis Internet vers un serveur interne, en fonction du port utilis\u00e9.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Bonnes pratiques<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>- Ouvrir uniquement les ports n\u00e9cessaires\n- Isoler les serveurs dans une DMZ\n- Ajouter des ACL pour filtrer les acc\u00e8s et penser aux chemins de retour de la connexion \u00e9tablie TCP.\n- Surveiller les traductions NAT<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Fichiers de configuration importants<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>running-config<br>startup-config<br>access-lists<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u00c0 retenir<\/h2>\n\n\n\n<p>Le PAT permet de publier un service interne tout en conservant une seule adresse IP publique.<br>C\u2019est un m\u00e9canisme essentiel pour l\u2019h\u00e9bergement web et les architectures r\u00e9seau s\u00e9curis\u00e9es.<audio autoplay=\"\"><\/audio><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cette fiche pr\u00e9sente la mise en \u0153uvre d\u2019un PAT (Port Address Translation) avec Cisco IOS pour publier un serveur web situ\u00e9 en DMZ vers Internet.Elle est adapt\u00e9e aux \u00e9tudiants en BTS CIEL ou SIO et constitue une base classique en administration r\u00e9seau. Topologie Plan d\u2019adressage Configuration Interfaces PAT dynamique (acc\u00e8s Internet) Redirection de ports (PAT [&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 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":[4,10],"tags":[],"class_list":["post-275","post","type-post","status-publish","format-standard","hentry","category-cisco","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 PAT avec Cisco ios (port forwarding\/translation + dmz) - 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\/cisco\/fiche-pat-avec-cisco-ios-port-forwarding-translation-dmz\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche PAT avec Cisco ios (port forwarding\/translation + dmz) - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Cette fiche pr\u00e9sente la mise en \u0153uvre d\u2019un PAT (Port Address Translation) avec Cisco IOS pour publier un serveur web situ\u00e9 en DMZ vers Internet.Elle est adapt\u00e9e aux \u00e9tudiants en BTS CIEL ou SIO et constitue une base classique en administration r\u00e9seau. 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