{"id":3764,"date":"2025-06-13T11:22:14","date_gmt":"2025-06-13T03:22:14","guid":{"rendered":"https:\/\/www.key-iot.com\/?p=3764"},"modified":"2025-06-13T11:23:28","modified_gmt":"2025-06-13T03:23:28","slug":"cant-plan-ip-addresses-as-a-network-engineer-thats-embarrassing","status":"publish","type":"post","link":"https:\/\/www.key-iot.com\/fr\/blog\/cant-plan-ip-addresses-as-a-network-engineer-thats-embarrassing\/","title":{"rendered":"Vous ne savez pas planifier les adresses IP en tant qu'ing\u00e9nieur r\u00e9seau ? C'est embarrassant"},"content":{"rendered":"<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\"><img decoding=\"async\" class=\"size-full wp-image-3765 aligncenter\" title=\"ae9fd27604b3ad66a72a7638636de0e8\" src=\"https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/06\/ae9fd27604b3ad66a72a7638636de0e8.png\" alt=\"ae9fd27604b3ad66a72a7638636de0e8\" width=\"879\" height=\"543\" srcset=\"https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/06\/ae9fd27604b3ad66a72a7638636de0e8.png 879w, https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/06\/ae9fd27604b3ad66a72a7638636de0e8-300x185.png 300w, https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/06\/ae9fd27604b3ad66a72a7638636de0e8-768x474.png 768w, https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/06\/ae9fd27604b3ad66a72a7638636de0e8-600x371.png 600w\" sizes=\"(max-width: 879px) 100vw, 879px\" \/><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Nombreux sont ceux qui, en entrant dans la profession d'ing\u00e9nieur r\u00e9seau, rencontrent pour la premi\u00e8re fois non pas le d\u00e9ploiement d'un commutateur ou la configuration d'un routeur, mais l'attribution d'une adresse IP. Curieusement, que ce soit dans le cadre de projets ou de forums, d'innombrables personnes sont d\u00e9sorient\u00e9es lorsqu'elles sont confront\u00e9es \u00e0 la question \"comment attribuer des adresses IP\" - en particulier celles qui travaillent sur des r\u00e9seaux de surveillance ou d'entreprise et qui sont d\u00e9sempar\u00e9es lorsqu'elles ont affaire \u00e0 des appareils multiples et \u00e0 des segments de r\u00e9seau de grande taille.<\/div>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Cet article se concentre sur la comp\u00e9tence de base des ing\u00e9nieurs r\u00e9seau : comment planifier raisonnablement les adresses IP.<\/div>\n<h2 class=\"header-OdWb_u auto-hide-last-sibling-br\">Pourquoi la planification des adresses IP est-elle importante ?<\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Commen\u00e7ons par une logique de base :<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Planification IP d\u00e9raisonnable \u2192 conflits IP + chaos sur le r\u00e9seau + maintenance cauchemardesque<\/li>\n<li>Planification IP claire \u2192 probl\u00e8mes identifiables d'un seul coup d'\u0153il + d\u00e9pannage facile + extension sans probl\u00e8me<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Les petits projets comportant des dizaines de cam\u00e9ras ou d'ordinateurs ne semblent pas affect\u00e9s - vous pouvez m\u00eame utiliser 192.168.1.X pour tous les p\u00e9riph\u00e9riques. Mais dans le cas de projets de grande envergure, tels que des centaines de cam\u00e9ras de surveillance, des \u00e9quipements pour plusieurs b\u00e2timents ou des r\u00e9seaux de campus, une mauvaise planification des adresses IP vous fera rapidement regretter votre d\u00e9cision.<\/div>\n<h2 class=\"header-OdWb_u auto-hide-last-sibling-br\">\u00c9tude de cas : Comment attribuer des adresses IP \u00e0 300 points de surveillance ?<\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Prenons l'exemple d'un projet de surveillance d'une usine :<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>300 cam\u00e9ras au total<\/li>\n<li>Divis\u00e9 en 4 zones :\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Zone A : 70 cam\u00e9ras<\/li>\n<li>Zone B : 70 cam\u00e9ras<\/li>\n<li>Zone C : 80 cam\u00e9ras<\/li>\n<li>Zone D : 80 cam\u00e9ras<\/li>\n<\/ul>\n<\/li>\n<li>Exigence : Tous les appareils d'un r\u00e9seau interne, connect\u00e9s par des liaisons en fibre optique et des commutateurs de zone.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Il existe deux approches principales en mati\u00e8re d'attribution d'adresses IP :<\/div>\n<h3 class=\"header-OdWb_u auto-hide-last-sibling-br\">Solution 1 : Pas de VLAN, un grand segment de r\u00e9seau<\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Placer tous les appareils dans un super segment de r\u00e9seau, par exemple :<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>R\u00e9seau : 192.168.0.0\/23 (masque de sous-r\u00e9seau 255.255.254.0)<\/li>\n<li>IP disponibles : 192.168.0.1 \u00e0 192.168.1.254<\/li>\n<li>Total disponible : 510 IP, soit plus qu'il n'en faut pour 300 appareils.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\"><strong>Inconv\u00e9nients<\/strong>:<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Diffusions excessives : Tous les appareils se trouvent dans un seul domaine de diffusion, ce qui entra\u00eene des temp\u00eates sur le r\u00e9seau.<\/li>\n<li>D\u00e9pannage difficile : Pas de correspondance claire entre les IP et les zones.<\/li>\n<li>Faible \u00e9volutivit\u00e9 : Conflits d'adresses IP faciles \u00e0 r\u00e9soudre lors de l'ajout d'appareils.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Simple mais d\u00e9conseill\u00e9 pour les projets complexes et de grande envergure.<\/div>\n<h3 class=\"header-OdWb_u auto-hide-last-sibling-br\">Solution 2 : R\u00e9seaux segment\u00e9s + VLAN, zones ind\u00e9pendantes<\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Approche recommand\u00e9e : Utiliser un commutateur central pour cr\u00e9er plusieurs VLAN, chaque zone ayant son propre sous-r\u00e9seau.<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Chaque zone prend en charge jusqu'\u00e0 254 adresses IP, ce qui permet de couvrir les appareils actuels avec une marge d'extension.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\"><strong>Avantages<\/strong>:<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Les segments IP identifient clairement les zones en un coup d'\u0153il.<\/li>\n<li>Le ping par lots permet de localiser rapidement les appareils hors ligne.<\/li>\n<li>Pr\u00e9vient les conflits d'adresses IP.<\/li>\n<li>Simplifie l'entretien \u00e0 long terme.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Pour les projets plus importants, utilisez 192.168.X.0\/23 ou des segments priv\u00e9s plus grands (par exemple, 10.X.X.X) pour plus de flexibilit\u00e9 et d'efficacit\u00e9 des ressources.<\/div>\n<h2 class=\"header-OdWb_u auto-hide-last-sibling-br\">Conseils universels pour la planification des adresses IP<\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Voici des formules pratiques \u00e0 suivre :<\/div>\n<h3 class=\"header-OdWb_u auto-hide-last-sibling-br\">1. Attribution par zones physiques<\/h3>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>Immeubles de bureaux : Par \u00e9tage<\/li>\n<li>Parcs industriels : par domaines fonctionnels<\/li>\n<li>Cam\u00e9ras : Par b\u00e2timent ou points fonctionnels<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Exemple pour un r\u00e9seau scolaire :<\/div>\n<p>&nbsp;<\/p>\n<ul class=\"auto-hide-last-sibling-br\">\n<li>B\u00e2timent d'enseignement 1 : 192.168.10.0\/24<\/li>\n<li>B\u00e2timent d'enseignement 2 : 192.168.11.0\/24<\/li>\n<li>Dortoir A : 192.168.20.0\/24<\/li>\n<li>Dortoir B : 192.168.21.0\/24<\/li>\n<\/ul>\n<h3 class=\"header-OdWb_u auto-hide-last-sibling-br\">2. Normaliser les adresses de passerelle<\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Adopter une convention, par exemple utiliser\u00a0<code>.1<\/code>\u00a0comme passerelle (par exemple, 192.168.10.1), ce qui permet de s'en souvenir facilement.<\/div>\n<h3 class=\"header-OdWb_u auto-hide-last-sibling-br\">3. R\u00e9server un pool d'IP de r\u00e9serve<\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Attribuer des IP d'utilisateur (par exemple, 1-120) et r\u00e9server 121-254 pour de futurs appareils.<\/div>\n<h3 class=\"header-OdWb_u auto-hide-last-sibling-br\">4. La documentation ! La documentation ! La documentation !<\/h3>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">Tenez \u00e0 jour un tableau d'attribution des adresses IP - ne vous fiez jamais uniquement \u00e0 votre m\u00e9moire. Au minimum, utilisez une liste sur une feuille Excel :<br class=\"container-Vdm5p7 wrapper-_7axQ_ undefined\" \/>| Le syst\u00e8me de gestion de l'information est un outil de gestion de l'information qui permet d'identifier et d'\u00e9valuer les besoins en mati\u00e8re de gestion de l'information et d'y r\u00e9pondre.<\/div>\n<h2 class=\"header-OdWb_u auto-hide-last-sibling-br\">R\u00e9flexions finales<\/h2>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">La planification des adresses IP peut sembler simple, mais son importance cro\u00eet avec l'ampleur du projet. Une mauvaise planification fait de vous un ouvrier ; une bonne planification fait de vous un architecte.<\/div>\n<p>&nbsp;<\/p>\n<div class=\"auto-hide-last-sibling-br paragraph-Oc488D paragraph-element br-paragraph-space\">D\u00e9veloppez des habitudes de planification standardis\u00e9es, m\u00eame pour les petits projets. M\u00eame lors de la mise en place d'un r\u00e9seau domestique, \u00e9vitez de placer tous les appareils dans 192.168.1.1-254 - pratiquez le sous-r\u00e9seau. Les comp\u00e9tences que vous acqu\u00e9rez aujourd'hui vous permettront de progresser dans votre carri\u00e8re demain.<\/div>","protected":false},"excerpt":{"rendered":"<p>Many people entering the network engineering profession first encounter not switch deployment or router configuration, but IP address allocation. Strangely, whether in projects or forums, countless people get confused when facing the question of &#8220;how to allocate IP addresses&#8221;\u2014especially those working on surveillance or enterprise networks, who are at a loss when dealing with multi-device [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"themepark_post_bcolor":"#f5f5f5","themepark_post_width":"1022px","themepark_post_img":"","themepark_post_img_po":"left","themepark_post_img_re":false,"themepark_post_img_cover":false,"themepark_post_img_fixed":false,"themepark_post_hide_title":false,"themepark_post_main_b":"","themepark_post_main_p":100,"themepark_paddingblock":false,"footnotes":""},"categories":[16],"tags":[],"class_list":["post-3764","post","type-post","status-publish","format-standard","hentry","category-blog"],"metadata":{"classic-editor-remember":["classic-editor"],"_edit_lock":["1749794481:1"],"_edit_last":["1"],"themepark_seo_title":["Can't Plan IP Addresses as a Network Engineer? That's Embarrassing"],"themepark_seo_description":["whether in projects or forums, countless people get confused when facing the question of \"how to allocate IP addresses\"\u2014especially those working on surveillance or enterprise networks, who are at a loss when dealing with multi-device and large network segments."],"themepark_seo_keyword":["Plan IP Addresses"],"catce":["sidebar-widgets4"],"_yoast_wpseo_primary_category":["16"],"_yoast_wpseo_metadesc":["whether in projects or forums, countless people get confused when facing the question of \"how to allocate IP addresses\"\u2014especially those working on surveillance or enterprise networks, who are at a loss when dealing with multi-device and large network segments."],"_yoast_wpseo_content_score":["60"],"_yoast_wpseo_estimated-reading-time-minutes":["3"],"views":["6013"],"_wpml_word_count":["632"]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Can&#039;t Plan IP Addresses as a Network Engineer? That&#039;s Embarrassing - KEY-IOT<\/title>\n<meta name=\"description\" content=\"whether in projects or forums, countless people get confused when facing the question of &quot;how to allocate IP addresses&quot;\u2014especially those working on surveillance or enterprise networks, who are at a loss when dealing with multi-device and large network segments.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.key-iot.com\/fr\/blog\/cant-plan-ip-addresses-as-a-network-engineer-thats-embarrassing\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Can&#039;t Plan IP Addresses as a Network Engineer? 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