{"id":3871,"date":"2025-07-07T11:19:58","date_gmt":"2025-07-07T03:19:58","guid":{"rendered":"https:\/\/www.key-iot.com\/?p=3871"},"modified":"2025-07-07T11:20:51","modified_gmt":"2025-07-07T03:20:51","slug":"why-segment-networks-even-when-ip-addresses-are-sufficient","status":"publish","type":"post","link":"https:\/\/www.key-iot.com\/fr\/blog\/why-segment-networks-even-when-ip-addresses-are-sufficient\/","title":{"rendered":"Pourquoi segmenter les r\u00e9seaux m\u00eame si les adresses IP suffisent ?"},"content":{"rendered":"<div translate=\"no\"><\/div>\n<div translate=\"no\"><img decoding=\"async\" class=\"size-full wp-image-3873 aligncenter\" title=\"764c815afd4b0b19b91be26fac2d4822\" src=\"https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/07\/764c815afd4b0b19b91be26fac2d4822.png\" alt=\"764c815afd4b0b19b91be26fac2d4822\" width=\"859\" height=\"574\" srcset=\"https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/07\/764c815afd4b0b19b91be26fac2d4822.png 859w, https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/07\/764c815afd4b0b19b91be26fac2d4822-300x200.png 300w, https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/07\/764c815afd4b0b19b91be26fac2d4822-768x513.png 768w, https:\/\/www.key-iot.com\/wp-content\/uploads\/2025\/07\/764c815afd4b0b19b91be26fac2d4822-600x401.png 600w\" sizes=\"(max-width: 859px) 100vw, 859px\" \/><\/div>\n<div translate=\"no\"><\/div>\n<div translate=\"no\">De nombreuses personnes qui apprennent \u00e0 travailler en r\u00e9seau et qui abordent le sujet de l'adressage IP se posent souvent la question :<\/div>\n<div translate=\"no\">\"Mon entreprise ne poss\u00e8de que quelques dizaines d'appareils et un seul segment de r\u00e9seau suffit pour toutes nos adresses IP. Pourquoi se diviser en autant de sous-r\u00e9seaux ?\"<\/div>\n<div translate=\"no\">Ne riez pas, il ne s'agit pas d'une question de d\u00e9butant. De nombreux ing\u00e9nieurs r\u00e9seau ayant des ann\u00e9es d'exp\u00e9rience tombent dans ce pi\u00e8ge : avoir suffisamment d'adresses IP \u2260 segmenter correctement le r\u00e9seau.<\/div>\n<div translate=\"no\">Alors aujourd'hui, clarifions les choses : pourquoi segmenter les r\u00e9seaux quand on a suffisamment d'adresses IP ?<\/div>\n<div translate=\"no\">\n<h2>I. Le point cl\u00e9 : La segmentation du r\u00e9seau ne consiste pas \u00e0 \"sauver des adresses IP\".<\/h2>\n<p>Il s'agit de contr\u00f4ler le trafic, les autorisations et les risques !<\/p>\n<\/div>\n<div translate=\"no\">Au fond, la segmentation du r\u00e9seau n'est pas une question de conservation des ressources, mais de gouvernance du r\u00e9seau.<\/div>\n<div translate=\"no\">Ces sc\u00e9narios vous semblent-ils familiers ?<\/div>\n<div translate=\"no\">\n<ul>\n<li translate=\"no\">Un ordinateur de bureau infect\u00e9 lance des attaques ARP contre un \u00e9tage entier d'appareils.<\/li>\n<li translate=\"no\">Les appareils invit\u00e9s peuvent directement envoyer des signaux ping aux serveurs centraux de l'entreprise<\/li>\n<li translate=\"no\">Paquets DHCP flottant partout, avec des appareils dans le mauvais VLAN recevant des IP incorrectes<\/li>\n<li translate=\"no\">Les services submergent les liaisons de trafic crois\u00e9 tandis que les services informatiques peinent \u00e0 en identifier la source.<\/li>\n<\/ul>\n<\/div>\n<div translate=\"no\">Le probl\u00e8me fondamental n'est pas d'avoir trop d'appareils, c'est l'absence de segmentation du r\u00e9seau qui cr\u00e9e des environnements sans fronti\u00e8res.<\/div>\n<div translate=\"no\">\n<h2>II. Un r\u00e9seau non segment\u00e9 est comme un grand dortoir<\/h2>\n<p>Dites adieu \u00e0 la s\u00e9curit\u00e9, \u00e0 l'efficacit\u00e9 et \u00e0 la facilit\u00e9 de gestion !<\/p>\n<\/div>\n<div translate=\"no\">Pensez-y de la mani\u00e8re suivante :<\/div>\n<div translate=\"no\">\u2605 Pas de segmentation = Tous les appareils de l'entreprise vivent dans un seul \"dortoir\". Lorsque quelqu'un tousse, tout le monde l'entend ; lorsque quelqu'un met le feu, c'est tout le dortoir qui br\u00fble.<\/div>\n<div translate=\"no\">Si l'on va plus loin, vous rencontrerez les pi\u00e8ges suivants :<\/div>\n<div translate=\"no\">\n<h3>1. Inondations de radiodiffusion et temp\u00eates d'ARP soudaines<\/h3>\n<\/div>\n<div translate=\"no\">Les diffusions de la couche 2 (ARP, DHCP, multicast) ne sont pas isol\u00e9es Avec de nombreux appareils, chaque nouvel ordinateur diffuse \u00e0 l'ensemble du r\u00e9seau en demandant \" Qui \u00eates-vous ? \". Dans le meilleur des cas : utilisation \u00e9lev\u00e9e des cartes r\u00e9seau ; dans le pire des cas : latence sur l'ensemble du service Ne pensez pas que \"quelques dizaines de machines\" n'auront pas d'importance : une fois que des appareils IoT ou des cam\u00e9ras de s\u00e9curit\u00e9 seront ajout\u00e9s, vous atteindrez rapidement des milliers de points d'extr\u00e9mit\u00e9.<\/div>\n<div translate=\"no\">\n<h3>2. Les autorisations de s\u00e9curit\u00e9 deviennent ing\u00e9rables - aucune limite ne signifie aucune r\u00e8gle<\/h3>\n<\/div>\n<div translate=\"no\">Par exemple :<\/div>\n<div translate=\"no\">Les syst\u00e8mes financiers, les r\u00e9seaux d'invit\u00e9s et les PC de bureau partagent tous un grand segment de r\u00e9seau Un pirate informatique introduit un p\u00e9riph\u00e9rique externe, scanne l'ensemble du r\u00e9seau 192.168.1.0\/24 et conna\u00eet imm\u00e9diatement l'agencement de vos ressources Comment \u00e9viter cela ? Les listes de contr\u00f4le d'acc\u00e8s deviennent difficiles \u00e0 \u00e9crire et les r\u00e8gles de pare-feu deviennent complexes.<\/div>\n<div translate=\"no\">\n<p>Une segmentation ad\u00e9quate permet d'appliquer directement des restrictions ACL ou VLAN :<\/p>\n<div translate=\"no\">\n<div data-testid=\"youchat-code\">\n<div>\n<div>javascript<\/div>\n<div><\/div>\n<\/div>\n<div>\n<pre>deny finance_vlan to visitor_vlan\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div translate=\"no\">Les fronti\u00e8res permettent le contr\u00f4le.<\/div>\n<div translate=\"no\">\n<h3>3. Le d\u00e9pannage devient un jeu d'enfant - m\u00eame les captures de paquets sont difficiles.<\/h3>\n<\/div>\n<div translate=\"no\">Lorsque vous \u00e9tudiez la perte de paquets sur un appareil sp\u00e9cifique, l'ensemble de votre segment de r\u00e9seau contient un trafic mixte :<\/div>\n<div translate=\"no\">\n<ul>\n<li translate=\"yes\">Quel trafic concerne les cam\u00e9ras de s\u00e9curit\u00e9 ?<\/li>\n<li translate=\"yes\">Lequel fait partie des syst\u00e8mes bureautiques ?<\/li>\n<li translate=\"no\">Laquelle provient de cadres utilisant Zoom ?<\/li>\n<\/ul>\n<\/div>\n<div translate=\"no\">Vos captures de paquets sont remplies de messages de diffusion, ce qui rend l'analyse presque impossible.<\/div>\n<div translate=\"no\">Gr\u00e2ce \u00e0 une segmentation ad\u00e9quate, vous pouvez identifier les probl\u00e8mes par \"secteur d'activit\u00e9\", ce qui rend vos captures plus pr\u00e9cises et la r\u00e9solution des probl\u00e8mes plus rapide.<\/div>\n<div translate=\"no\">\n<h3>4. Les dispositifs de la couche sup\u00e9rieure sont confront\u00e9s \u00e0 une forte pression et \u00e0 une faible efficacit\u00e9 de transfert<\/h3>\n<\/div>\n<div translate=\"no\">L'entassement de milliers de p\u00e9riph\u00e9riques sur un segment transforme les tables ARP et MAC de votre p\u00e9riph\u00e9rique de couche 3 en une zone sinistr\u00e9e :<\/div>\n<div translate=\"no\">\n<ul>\n<li translate=\"yes\">Les entr\u00e9es ARP explosent<\/li>\n<li translate=\"yes\">Les tables MAC fluctuent \u00e9norm\u00e9ment<\/li>\n<li translate=\"no\">Les conflits d'adresses DHCP sont fr\u00e9quents<\/li>\n<\/ul>\n<\/div>\n<div translate=\"no\">Le probl\u00e8me n'est alors plus de savoir si le r\u00e9seau est connect\u00e9, mais pourquoi le r\u00e9seau est si lent qu'il donne l'impression d'\u00eatre d\u00e9connect\u00e9.<\/div>\n<div translate=\"no\">\n<h2>III. Comment segmenter correctement les r\u00e9seaux ?<\/h2>\n<p>Bien qu'il n'y ait pas de r\u00e9ponse standard, voici quelques approches pratiques consensuelles :<\/p>\n<\/div>\n<div translate=\"no\">\n<h3>1. Segmentation par fonction\/service<\/h3>\n<\/div>\n<div translate=\"no\">Quelques approches typiques de la segmentation :<\/div>\n<div translate=\"no\">\n<ul>\n<li translate=\"yes\">VLAN de gestion pour les \u00e9quipements de r\u00e9seau (<a href=\"https:\/\/www.key-iot.com\/fr\/iotproduct\/cellular-routers\/\"><strong>routeurs industriels<\/strong><\/a>(commutateurs, AP)<\/li>\n<li translate=\"yes\">VLAN serveur pour les serveurs d'entreprise<\/li>\n<li translate=\"yes\">Office VLAN pour les postes de travail des employ\u00e9s<\/li>\n<li translate=\"yes\">VLAN invit\u00e9 pour les visiteurs<\/li>\n<li translate=\"no\">VLAN IoT pour les cam\u00e9ras, les capteurs et autres appareils intelligents<\/li>\n<\/ul>\n<\/div>\n<div translate=\"no\">\n<h3>2. La segmentation par \u00e9tage\/zone fonctionne \u00e9galement<\/h3>\n<\/div>\n<div translate=\"no\">\n<ul>\n<li translate=\"yes\">Le premier \u00e9tage re\u00e7oit un segment, le second \u00e9tage en re\u00e7oit un autre<\/li>\n<li translate=\"no\">La zone de bureaux Est re\u00e7oit un segment, la zone de bureaux Ouest en re\u00e7oit un autre<\/li>\n<\/ul>\n<\/div>\n<div translate=\"no\">Cette approche s'aligne sur la distribution des commutateurs, ce qui rend la gestion plus claire et les probl\u00e8mes de liaison imm\u00e9diatement identifiables.<\/div>\n<div translate=\"no\">\n<h3>3. Chaque segment de r\u00e9seau ne doit pas comporter plus de 200 appareils.<\/h3>\n<\/div>\n<div translate=\"no\">Un r\u00e9seau \/24 (254 IP au maximum) est le plus courant ; envisagez de diviser davantage le sous-r\u00e9seau si vous d\u00e9passez cette limite. Une autre solution consiste \u00e0 mettre en \u0153uvre des passerelles de couche 3 pour diviser les domaines de diffusion et \u00e9viter les temp\u00eates de diffusion.<\/div>\n<div translate=\"no\">\n<h2>Conclusion :<\/h2>\n<p>La question de savoir si vous avez suffisamment d'adresses IP est une question de ressources ; la question de savoir s'il faut segmenter votre r\u00e9seau est une question de gouvernance.<\/p>\n<\/div>\n<div translate=\"no\">Ne pensez pas que vous avez termin\u00e9 simplement parce que vous avez attribu\u00e9 toutes vos adresses IP. Ce qui rend votre syst\u00e8me stable, s\u00fbr et contr\u00f4lable, c'est de savoir si vous avez clairement segment\u00e9 votre r\u00e9seau avec des limites appropri\u00e9es.<\/div>\n<div translate=\"no\"><\/div>\n<div translate=\"no\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Many people learning networking who reach the IP addressing topic often wonder: &#8220;My company only has a few dozen devices, and one network segment is enough for all our IP addresses. Why divide into so many subnets?&#8221; Don&#8217;t laugh\u2014this isn&#8217;t just a beginner&#8217;s question. Many network engineers with years of experience fall into this trap: [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3874,"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-3871","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"metadata":{"classic-editor-remember":["classic-editor"],"_edit_lock":["1751874865:1"],"_edit_last":["1"],"themepark_seo_title":["Why Segment Networks Even When IP Addresses Are Sufficient?"],"themepark_seo_description":["\"My company only has a few dozen devices, and one network segment is enough for all our IP addresses. Why divide into so many subnets?\"\r\nDon't laugh\u2014this isn't just a beginner's question. Many network engineers with years of experience fall into this trap: Having enough IP addresses \u2260 Proper network segmentation."],"themepark_seo_keyword":[" IP Addresses"],"catce":["sidebar-widgets4"],"_yoast_wpseo_primary_category":["16"],"_yoast_wpseo_metadesc":["Whether you have enough IP addresses is a resource issue; Whether to segment your network is a governance issue.Don't think you're finished just because you've allocated all your IPs. What truly makes your system stable, secure, and controllable is whether you've clearly segmented your network with proper boundaries."],"_yoast_wpseo_content_score":["90"],"_yoast_wpseo_estimated-reading-time-minutes":["4"],"_thumbnail_id":["3874"],"views":["7753"],"_wpml_word_count":["796"],"_trp_automatically_translated_slug_es_PE":["por-que-segmentar-las-redes-incluso-cuando-las-direcciones-ip-son-suficientes"]},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Why Segment Networks Even When IP Addresses Are Sufficient? - KEY-IOT<\/title>\n<meta name=\"description\" content=\"Whether you have enough IP addresses is a resource issue; Whether to segment your network is a governance issue.Don&#039;t think you&#039;re finished just because you&#039;ve allocated all your IPs. 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