{"id":39,"date":"2026-05-01T18:16:51","date_gmt":"2026-05-01T16:16:51","guid":{"rendered":"http:\/\/192.168.20.20\/?p=39"},"modified":"2026-05-02T14:12:40","modified_gmt":"2026-05-02T12:12:40","slug":"fiche-console-vty-telnet-ssh-acces-et-securisation-cisco","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/cisco\/fiche-console-vty-telnet-ssh-acces-et-securisation-cisco\/","title":{"rendered":"Fiche CONSOLE, VTY TELNET \/ SSH \u2013 ACC\u00c8S ET S\u00c9CURISATION CISCO"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"http:\/\/192.168.20.20\/wp-content\/uploads\/2026\/05\/image-4-1024x683.png\" alt=\"\" class=\"wp-image-40\" srcset=\"https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-4-1024x683.png 1024w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-4-300x200.png 300w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-4-768x512.png 768w, https:\/\/eryann.fr\/wp-content\/uploads\/2026\/05\/image-4.png 1536w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Introduction (BTS CIEL \/ SIO)<\/h3>\n\n\n\n<p>Dans un environnement BTS CIEL ou SIO, comprendre les diff\u00e9rents modes d\u2019acc\u00e8s \u00e0 un \u00e9quipement Cisco est indispensable pour l\u2019administration et la s\u00e9curisation du r\u00e9seau.<br>Un mauvais param\u00e9trage des acc\u00e8s peut permettre une prise de contr\u00f4le \u00e0 distance.<\/p>\n\n\n\n<p>L\u2019objectif est de :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>comprendre les types d\u2019acc\u00e8s (console, Telnet, SSH)<\/li>\n\n\n\n<li>configurer un acc\u00e8s s\u00e9curis\u00e9<\/li>\n\n\n\n<li>interdire les m\u00e9thodes non s\u00e9curis\u00e9es<\/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\">Configuration compl\u00e8te (copier-coller)<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>#############################################<br># CONFIGURATION ACCES SECURISE<br>#############################################<br><br>enable<br>configure terminal<br><br>hostname SECURE-EQUIP<br><br>! ==============================<br>! UTILISATEUR LOCAL<br>! ==============================<br>username admin privilege 15 secret &lt;PASSWORD&gt;<br><br>! ==============================<br>! MOT DE PASSE PRIVILEGE<br>! ==============================<br>enable secret &lt;PASSWORD&gt;<br><br>! ==============================<br>! CHIFFREMENT<br>! ==============================<br>service password-encryption<br><br>! ==============================<br>! CONSOLE<br>! ==============================<br>line console 0<br> login local<br> exec-timeout 5 0<br> logging synchronous<br><br>! ==============================<br>! SSH<br>! ==============================<br>no ip domain-lookup<br>ip domain-name breizh.local<br><br>crypto key generate rsa modulus 2048<br>ip ssh version 2<br><br>! ==============================<br>! VTY (ACCES DISTANT)<br>! ==============================<br>line vty 0 4<br> transport input ssh<br> login local<br> exec-timeout 5 0<br><br>! Protection brute force<br>login block-for 60 attempts 3 within 60<br><br>end<br>write memory<\/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 d\u00e9taill\u00e9e<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Types d\u2019acc\u00e8s<\/h3>\n\n\n\n<p>Console<br>Acc\u00e8s local via c\u00e2ble console. Utilis\u00e9 pour la configuration initiale ou en cas de panne r\u00e9seau.<br>Aucun chiffrement mais acc\u00e8s physique requis.<\/p>\n\n\n\n<p>Telnet<br>Acc\u00e8s distant en clair (port TCP 23).<br>Les identifiants transitent sans chiffrement.<br>\u00c0 \u00e9viter en production.<\/p>\n\n\n\n<p>SSH<br>Acc\u00e8s distant chiffr\u00e9 (port TCP 22).<br>Permet une administration s\u00e9curis\u00e9e.<br>M\u00e9thode recommand\u00e9e.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Configuration console<\/h3>\n\n\n\n<p><code>line console 0<\/code><br>Active la configuration de la console.<\/p>\n\n\n\n<p><code>login local<\/code><br>Oblige l\u2019authentification avec un compte local.<\/p>\n\n\n\n<p><code>exec-timeout<\/code><br>D\u00e9connecte automatiquement une session inactive.<\/p>\n\n\n\n<p><code>logging synchronous<\/code><br>Am\u00e9liore la lisibilit\u00e9 des logs.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Configuration SSH<\/h3>\n\n\n\n<p><code>ip domain-name<\/code><br>N\u00e9cessaire pour g\u00e9n\u00e9rer les cl\u00e9s RSA.<\/p>\n\n\n\n<p><code>crypto key generate rsa<\/code><br>Cr\u00e9e la cl\u00e9 utilis\u00e9e pour le chiffrement.<\/p>\n\n\n\n<p><code>ip ssh version 2<\/code><br>Force une version s\u00e9curis\u00e9e du protocole.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Lignes VTY<\/h3>\n\n\n\n<p><code>line vty 0 4<\/code><br>Correspond aux connexions distantes.<\/p>\n\n\n\n<p><code>transport input ssh<\/code><br>Autorise uniquement SSH (d\u00e9sactive Telnet).<\/p>\n\n\n\n<p><code>login local<\/code><br>Authentification via la base locale.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Protection des acc\u00e8s<\/h3>\n\n\n\n<p><code>login block-for<\/code><br>Bloque les tentatives de brute force.<\/p>\n\n\n\n<p><code>exec-timeout<\/code><br>Limite les sessions ouvertes inutilement.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Points cl\u00e9s<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Console = acc\u00e8s local uniquement<\/li>\n\n\n\n<li>Telnet = non s\u00e9curis\u00e9<\/li>\n\n\n\n<li>SSH = obligatoire en production<\/li>\n\n\n\n<li>Authentification locale requise<\/li>\n\n\n\n<li>Blocage des tentatives de connexion<\/li>\n\n\n\n<li>Fermeture automatique des sessions<\/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\">Suite logique<\/h2>\n\n\n\n<p>Pour compl\u00e9ter cette fiche :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ACL pour restreindre l\u2019acc\u00e8s SSH<\/li>\n\n\n\n<li>AAA (Radius \/ Tacacs+)<\/li>\n\n\n\n<li>journalisation avanc\u00e9e<\/li>\n\n\n\n<li>supervision des acc\u00e8s<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Introduction (BTS CIEL \/ SIO) Dans un environnement BTS CIEL ou SIO, comprendre les diff\u00e9rents modes d\u2019acc\u00e8s \u00e0 un \u00e9quipement Cisco est indispensable pour l\u2019administration et la s\u00e9curisation du r\u00e9seau.Un mauvais param\u00e9trage des acc\u00e8s peut permettre une prise de contr\u00f4le \u00e0 distance. L\u2019objectif est de : Configuration compl\u00e8te (copier-coller) Explication d\u00e9taill\u00e9e Types d\u2019acc\u00e8s ConsoleAcc\u00e8s local [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","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":[3],"class_list":["post-39","post","type-post","status-publish","format-standard","hentry","category-cisco","category-reseau","tag-cisco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Fiche CONSOLE, VTY TELNET \/ SSH \u2013 ACC\u00c8S ET S\u00c9CURISATION CISCO - 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-console-vty-telnet-ssh-acces-et-securisation-cisco\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Fiche CONSOLE, VTY TELNET \/ SSH \u2013 ACC\u00c8S ET S\u00c9CURISATION CISCO - Eryann Breizh SecOps\" \/>\n<meta property=\"og:description\" content=\"Introduction (BTS CIEL \/ SIO) Dans un environnement BTS CIEL ou SIO, comprendre les diff\u00e9rents modes d\u2019acc\u00e8s \u00e0 un \u00e9quipement Cisco est indispensable pour l\u2019administration et la s\u00e9curisation du r\u00e9seau.Un mauvais param\u00e9trage des acc\u00e8s peut permettre une prise de contr\u00f4le \u00e0 distance. 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