{"id":93813,"date":"2026-05-17T20:26:22","date_gmt":"2026-05-17T20:26:22","guid":{"rendered":"https:\/\/teeptrak.com\/segmentation-purdue-ot-it-2026\/"},"modified":"2026-05-17T20:26:25","modified_gmt":"2026-05-17T20:26:25","slug":"segmentation-purdue-ot-it-2026","status":"publish","type":"post","link":"https:\/\/teeptrak.com\/fr\/segmentation-purdue-ot-it-2026\/","title":{"rendered":"Segmentation Purdue et OT\/IT en 2026 : architecture de s\u00e9curit\u00e9 industrielle"},"content":{"rendered":"<p>[et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.27&Prime;][et_pb_row _builder_version=\u00a0\u00bb4.27&Prime;][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.27&Prime;][et_pb_text _builder_version=\u00a0\u00bb4.27&Prime;]<\/p>\n<h1>Segmentation Purdue et OT\/IT en 2026 : architecture de s\u00e9curit\u00e9 industrielle<\/h1>\n<p><strong>Derni\u00e8re mise \u00e0 jour : 17 mai 2026.<\/strong> La segmentation r\u00e9seau selon le mod\u00e8le Purdue reste en 2026 le socle architectural de la cybers\u00e9curit\u00e9 industrielle. Cet article documente l&rsquo;architecture en 6 niveaux, l&rsquo;impl\u00e9mentation DMZ, et les pratiques recommand\u00e9es pour int\u00e9grer plateformes TRS et syst\u00e8mes OT en restant conforme IEC 62443.<\/p>\n<h2>Le mod\u00e8le Purdue : 6 niveaux et leurs composants<\/h2>\n<table>\n<thead>\n<tr>\n<th>Level<\/th>\n<th>Nom<\/th>\n<th>Composants typiques<\/th>\n<th>Protocoles<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Level 5<\/td>\n<td>Enterprise<\/td>\n<td>ERP (SAP, Odoo), CRM, mail, internet<\/td>\n<td>HTTPS, SMTP, SQL<\/td>\n<\/tr>\n<tr>\n<td>Level 4<\/td>\n<td>Site\/Business<\/td>\n<td>MES reporting, plateforme TRS analytics, BI, GMAO<\/td>\n<td>HTTPS, SQL, MQTT\/AMQP<\/td>\n<\/tr>\n<tr>\n<td>Level 3.5<\/td>\n<td>DMZ industrielle<\/td>\n<td>Firewalls bidirectionnels, historian (PI System), jumpserver, antivirus management<\/td>\n<td>OPC UA tunneling, HTTPS proxy<\/td>\n<\/tr>\n<tr>\n<td>Level 3<\/td>\n<td>Operations<\/td>\n<td>MES production, plateforme TRS collecte, HMI superviseur, historian local<\/td>\n<td>OPC UA, MQTT, Modbus TCP<\/td>\n<\/tr>\n<tr>\n<td>Level 2<\/td>\n<td>Supervisory Control<\/td>\n<td>SCADA, HMI poste, batch managers<\/td>\n<td>OPC DA\/UA, EtherNet\/IP, Modbus TCP<\/td>\n<\/tr>\n<tr>\n<td>Level 1<\/td>\n<td>Basic Control<\/td>\n<td>PLC (Siemens, Rockwell, Schneider), DCS, controllers<\/td>\n<td>Profinet, EtherNet\/IP, Modbus TCP\/RTU<\/td>\n<\/tr>\n<tr>\n<td>Level 0<\/td>\n<td>Process<\/td>\n<td>Capteurs, actionneurs, robots<\/td>\n<td>4-20 mA, Profibus, IO-Link, capteurs IoT<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>La segmentation Purdue impose un cloisonnement strict : aucune communication directe entre Level 4 (IT) et Level 3 (OT) sans passer par Level 3.5 (DMZ).<\/p>\n<h2>La DMZ industrielle (Level 3.5) en d\u00e9tail<\/h2>\n<p>La DMZ industrielle est l&rsquo;\u00e9l\u00e9ment architectural central de la segmentation Purdue. Elle contient des composants accessibles \u00e0 la fois depuis IT (Level 4-5) et OT (Level 3), avec des r\u00e8gles de communication strictes :<\/p>\n<ul>\n<li><strong>Aucune communication directe IT \u2194 OT<\/strong> : tous les flux passent par la DMZ.<\/li>\n<li><strong>Sens de communication restreint<\/strong> : OT pousse vers DMZ, IT tire depuis DMZ (pas l&rsquo;inverse).<\/li>\n<li><strong>Composants typiques DMZ<\/strong> : historian (collecte temps r\u00e9el OT, exposition IT), jumpserver (acc\u00e8s distant maintenance), proxy antivirus, replica plateforme TRS pour reporting groupe.<\/li>\n<li><strong>Pas de stockage permanent en DMZ<\/strong> : la DMZ relaie, ne stocke pas durablement. Persistance assur\u00e9e par les zones sources.<\/li>\n<\/ul>\n<p>L&rsquo;impl\u00e9mentation DMZ typique 2026 utilise : firewalls de nouvelle g\u00e9n\u00e9ration (Palo Alto, Fortinet, Cisco Firepower), historian (OSIsoft PI System, AVEVA, Inductive Automation Ignition), jumpserver (CyberArk, BeyondTrust) ou approche zero-trust avec authentification renforc\u00e9e.<\/p>\n<h2>L&rsquo;int\u00e9gration plateforme TRS dans l&rsquo;architecture Purdue<\/h2>\n<p>Une plateforme TRS s&rsquo;inscrit typiquement \u00e0 2 niveaux :<\/p>\n<ol>\n<li><strong>Collecte au Level 3 (Operations)<\/strong> : gateways IIoT connect\u00e9s aux PLC (Level 1) ou capteurs (Level 0) via OPC UA, MQTT, Modbus. Stockage local short-term.<\/li>\n<li><strong>Reporting au Level 4 (Business)<\/strong> : interface web, dashboards, exports vers MES\/ERP. Accessible aux utilisateurs m\u00e9tier.<\/li>\n<\/ol>\n<p>Le flux Level 3 \u2192 Level 4 passe obligatoirement par la DMZ (Level 3.5). Les bonnes pratiques :<\/p>\n<ul>\n<li><strong>R\u00e9plication unidirectionnelle<\/strong> Level 3 \u2192 DMZ \u2192 Level 4 (data diode ou firewall avec r\u00e8gles strictes).<\/li>\n<li><strong>Pas d&rsquo;acc\u00e8s direct utilisateur<\/strong> au Level 3 depuis IT. Les utilisateurs m\u00e9tier acc\u00e8dent au Level 4 ou \u00e0 la DMZ uniquement.<\/li>\n<li><strong>Authentification renforc\u00e9e<\/strong> sur tous les acc\u00e8s depuis IT, MFA obligatoire, comptes nominatifs.<\/li>\n<li><strong>Audit logs centralis\u00e9s<\/strong> au niveau SIEM, conservation 12-24 mois.<\/li>\n<\/ul>\n<h2>Les d\u00e9fis pratiques de la segmentation OT\/IT<\/h2>\n<h3>Protocoles industriels non chiffr\u00e9s<\/h3>\n<p>Les protocoles OT historiques (Modbus TCP, EtherNet\/IP, Profinet) ne sont pas chiffr\u00e9s par d\u00e9faut. La protection passe par la segmentation r\u00e9seau (VLAN, firewalls) et la migration progressive vers OPC UA (chiffrement TLS natif).<\/p>\n<h3>Automates non patchables<\/h3>\n<p>Les PLC anciens (Siemens S7-300, Rockwell SLC500, Schneider Modicon) ne re\u00e7oivent plus de patches s\u00e9curit\u00e9. La protection passe par l&rsquo;isolation r\u00e9seau, le monitoring d&rsquo;anomalies, et la migration progressive vers g\u00e9n\u00e9rations support\u00e9es.<\/p>\n<h3>Maintenance fournisseur distante<\/h3>\n<p>Les acc\u00e8s distants des fournisseurs (int\u00e9grateurs automates, fabricants machines) sont historiquement des modems analogiques ou VPN ouverts en permanence. La pratique s\u00e9curis\u00e9e 2026 : jumpserver DMZ, MFA, acc\u00e8s temporaire \u00e0 la demande, enregistrement de session.<\/p>\n<h3>P\u00e9riph\u00e9riques USB et BYOD<\/h3>\n<p>Les vecteurs d&rsquo;attaque physique (USB infect\u00e9s, laptops maintenance contamin\u00e9s) sont sous-estim\u00e9s. Stuxnet a d\u00e9montr\u00e9 la criticit\u00e9 de cette voie. Bonnes pratiques : politique USB stricte, sas de d\u00e9contamination, antivirus d\u00e9di\u00e9 OT, blocage USB sur PLC et HMI.<\/p>\n<h2>Les 5 actions de segmentation Purdue 2026<\/h2>\n<ol>\n<li><strong>Cartographie r\u00e9seau exhaustive<\/strong> : inventaire de tous les actifs OT, identification des communications r\u00e9elles, sch\u00e9ma Purdue document\u00e9.<\/li>\n<li><strong>Firewall IT\/OT entre Level 4 et Level 3<\/strong> : r\u00e8gles strictes, default deny, audit log activ\u00e9.<\/li>\n<li><strong>DMZ industrielle Level 3.5<\/strong> : historian, jumpserver, proxy. Pas de communication directe IT-OT.<\/li>\n<li><strong>VLAN par zone OT<\/strong> : segmentation interne entre lignes de production, zones critiques s\u00e9par\u00e9es.<\/li>\n<li><strong>Monitoring trafic OT<\/strong> : SIEM industriel (Nozomi, Claroty, Dragos) pour d\u00e9tection anomalies.<\/li>\n<\/ol>\n    <div class=\"teeptrak-form-container \">\n        <h3 class=\"teeptrak-form-title\">D\u00e9mo architecture Purdue + int\u00e9gration TRS s\u00e9curis\u00e9e<\/h3>                \n        <form id=\"teeptrak-6a0ab4aaed1e8\" class=\"teeptrak-form\" data-form-type=\"demo_request\">\n            <div style=\"position:absolute;left:-9999px;\"><input type=\"text\" name=\"website_url\" value=\"\" tabindex=\"-1\"><input type=\"text\" name=\"fax_number\" value=\"\" tabindex=\"-1\"><\/div>            \n            <div class=\"teeptrak-form-row teeptrak-form-row-half\">                <div class=\"teeptrak-form-field\">\n                    <label>Prenom <span class=\"required\">*<\/span><\/label>                    \n                                            <input type=\"text\" name=\"first_name\" required placeholder=\"\">\n                                    <\/div>\n                            <div class=\"teeptrak-form-field\">\n                    <label>Nom <span class=\"required\">*<\/span><\/label>                    \n                                            <input type=\"text\" name=\"last_name\" required placeholder=\"\">\n                                    <\/div>\n                            <div class=\"teeptrak-form-field\">\n                    <label>Email <span class=\"required\">*<\/span><\/label>                    \n                                            <input type=\"email\" name=\"email\" required placeholder=\"\">\n                                    <\/div>\n                            <div class=\"teeptrak-form-field\">\n                    <label>Telephone <span class=\"required\">*<\/span><\/label>                    \n                                            <input type=\"tel\" name=\"phone\" required placeholder=\"\">\n                                    <\/div>\n                            <div class=\"teeptrak-form-field\">\n                    <label>Entreprise <span class=\"required\">*<\/span><\/label>                    \n                                            <input type=\"text\" name=\"company\" required placeholder=\"\">\n                                    <\/div>\n                            <div class=\"teeptrak-form-field\">\n                    <label>Poste<\/label>                    \n                                            <input type=\"text\" name=\"job_title\"  placeholder=\"\">\n                                    <\/div>\n            <\/div><div class=\"teeptrak-form-row\">                <div class=\"teeptrak-form-field\">\n                    <label>Objectifs<\/label>                    \n                                            <textarea name=\"message\" rows=\"3\"  placeholder=\"\"><\/textarea>\n                                    <\/div>\n            <\/div>            \n            <input type=\"hidden\" name=\"page_url\" value=\"https:\/\/teeptrak.com\/fr\/segmentation-purdue-ot-it-2026\/\">\n            <input type=\"hidden\" name=\"recaptcha_token\" value=\"\" class=\"teeptrak-recaptcha-token\">\n            \n                        \n            <div class=\"teeptrak-form-row\">\n                <button type=\"submit\" class=\"teeptrak-submit teeptrak-submit-full\">\n                    <span class=\"teeptrak-submit-text\">R\u00e9server une d\u00e9mo<\/span>\n                    <span class=\"teeptrak-submit-loading\" style=\"display:none;\">Envoi...<\/span>\n                <\/button>\n            <\/div>\n            \n            <div class=\"teeptrak-form-message\" style=\"display:none;\"><\/div>\n        <\/form>\n    <\/div>\n    \n<h2>Questions fr\u00e9quentes<\/h2>\n<h3>Qu&rsquo;est-ce que le mod\u00e8le Purdue ?<\/h3>\n<p>R\u00e9f\u00e9rence ISA-95 \/ IEC 62264 pour segmentation OT\/IT en 6 niveaux : Level 0 (process), 1 (basic control), 2 (supervisory), 3 (operations), 3.5 (DMZ), 4 (business), 5 (enterprise).<\/p>\n<h3>Qu&rsquo;est-ce que la DMZ industrielle ?<\/h3>\n<p>Level 3.5 du mod\u00e8le Purdue. Zone interm\u00e9diaire entre IT et OT contenant historian, jumpserver, proxy. Aucune communication directe IT \u2194 OT, tout passe par la DMZ.<\/p>\n<h3>\u00c0 quel niveau Purdue se trouve une plateforme TRS ?<\/h3>\n<p>2 niveaux : collecte au Level 3 (Operations) avec gateways IIoT connect\u00e9s aux PLC\/capteurs. Reporting au Level 4 (Business) avec interface web. Communication Level 3 \u2192 Level 4 via DMZ Level 3.5.<\/p>\n<h3>Quels protocoles OT \u00e0 Level 1-2 ?<\/h3>\n<p>Profinet, EtherNet\/IP, Modbus TCP\/RTU pour communication automates. OPC DA\/UA pour interop\u00e9rabilit\u00e9. Capteurs Level 0 : 4-20 mA, Profibus, IO-Link, capteurs IoT (LoRaWAN, Sigfox).<\/p>\n<h3>Pourquoi la segmentation OT\/IT est-elle n\u00e9cessaire ?<\/h3>\n<p>IT et OT ont des contraintes diff\u00e9rentes (disponibilit\u00e9 OT 24\/7, automates non patchables, protocoles non chiffr\u00e9s). Communication directe expose OT aux attaques IT. Segmentation isole et prot\u00e8ge.<\/p>\n<h3>Comment int\u00e9grer une plateforme TRS en respectant Purdue ?<\/h3>\n<p>Collecte Level 3 connect\u00e9e aux PLC\/capteurs. Reporting Level 4 via DMZ. Pas de communication directe Level 3 \u2192 Level 4. R\u00e9plication unidirectionnelle (data diode ou firewall strict).<\/p>\n<h3>Faut-il une DMZ industrielle d\u00e9di\u00e9e ?<\/h3>\n<p>Recommand\u00e9 fortement par IEC 62443 et NIST SP 800-82. DMZ industrielle distincte de DMZ IT classique, avec composants sp\u00e9cifiques (historian, jumpserver OT). Investissement typique 30 000-150 000 \u20ac.<\/p>\n<h3>Comment g\u00e9rer les protocoles OT non chiffr\u00e9s ?<\/h3>\n<p>2 approches : 1) Segmentation r\u00e9seau stricte (VLAN, firewalls) pour isoler le trafic non chiffr\u00e9. 2) Migration progressive vers OPC UA (chiffrement TLS natif) sur les nouveaux \u00e9quipements.<\/p>\n<h3>Comment s\u00e9curiser la maintenance fournisseur distante ?<\/h3>\n<p>Jumpserver DMZ, MFA, acc\u00e8s temporaire \u00e0 la demande (pas VPN ouvert permanent), enregistrement de session, audit log centralis\u00e9. Outils : CyberArk, BeyondTrust, ou approche zero-trust.<\/p>\n<h3>Quelle est l&rsquo;erreur la plus fr\u00e9quente de segmentation OT ?<\/h3>\n<p>Communications directes IT \u2194 OT sans passer par DMZ. Workstations m\u00e9tier acc\u00e9dant directement aux SCADA, plateforme TRS en acc\u00e8s direct depuis IT. Risque d&rsquo;attaque lat\u00e9rale majeur.<\/p>\n<p><em>Auteur : Fran\u00e7ois Coulloudon, CEO, TeepTrak.<\/em><\/p>\n<p><script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/teeptrak.com\/segmentation-purdue-ot-it-2026\/#article\",\"headline\":\"Segmentation Purdue et OT\/IT en 2026 : architecture de s\u00e9curit\u00e9 industrielle\",\"datePublished\":\"2026-05-17\",\"inLanguage\":\"fr-FR\",\"author\":{\"@type\":\"Organization\",\"name\":\"TeepTrak\"}},{\"@type\":\"FAQPage\",\"inLanguage\":\"fr-FR\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"Qu'est-ce que le mod\u00e8le Purdue ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"R\u00e9f\u00e9rence ISA-95 \/ IEC 62264 pour segmentation OT\/IT en 6 niveaux : Level 0 (process), 1 (basic control), 2 (supervisory), 3 (operations), 3.5 (DMZ), 4 (business), 5 (enterprise).\"}},{\"@type\":\"Question\",\"name\":\"Qu'est-ce que la DMZ industrielle ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Level 3.5 du mod\u00e8le Purdue. Zone interm\u00e9diaire entre IT et OT contenant historian, jumpserver, proxy. Aucune communication directe IT \u2194 OT.\"}},{\"@type\":\"Question\",\"name\":\"\u00c0 quel niveau Purdue se trouve une plateforme TRS ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"2 niveaux : collecte Level 3 (Operations) avec gateways IIoT. Reporting Level 4 (Business). Communication via DMZ Level 3.5.\"}},{\"@type\":\"Question\",\"name\":\"Quels protocoles OT \u00e0 Level 1-2 ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Profinet, EtherNet\/IP, Modbus TCP\/RTU pour automates. OPC DA\/UA pour interop\u00e9rabilit\u00e9. Capteurs Level 0 : 4-20 mA, Profibus, IO-Link, IoT (LoRaWAN, Sigfox).\"}},{\"@type\":\"Question\",\"name\":\"Pourquoi la segmentation OT\/IT est-elle n\u00e9cessaire ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"IT et OT ont des contraintes diff\u00e9rentes (disponibilit\u00e9 OT 24\/7, automates non patchables, protocoles non chiffr\u00e9s). Communication directe expose OT aux attaques IT.\"}},{\"@type\":\"Question\",\"name\":\"Comment int\u00e9grer une plateforme TRS en respectant Purdue ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Collecte Level 3 connect\u00e9e aux PLC\/capteurs. Reporting Level 4 via DMZ. Pas de communication directe Level 3 \u2192 Level 4. R\u00e9plication unidirectionnelle.\"}},{\"@type\":\"Question\",\"name\":\"Faut-il une DMZ industrielle d\u00e9di\u00e9e ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Recommand\u00e9 fortement par IEC 62443 et NIST SP 800-82. DMZ industrielle distincte de DMZ IT. Investissement typique 30 000-150 000 \u20ac.\"}},{\"@type\":\"Question\",\"name\":\"Comment g\u00e9rer les protocoles OT non chiffr\u00e9s ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"2 approches : 1) Segmentation r\u00e9seau stricte (VLAN, firewalls). 2) Migration progressive vers OPC UA (chiffrement TLS natif) sur les nouveaux \u00e9quipements.\"}},{\"@type\":\"Question\",\"name\":\"Comment s\u00e9curiser la maintenance fournisseur distante ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Jumpserver DMZ, MFA, acc\u00e8s temporaire \u00e0 la demande (pas VPN ouvert permanent), enregistrement de session, audit log centralis\u00e9.\"}},{\"@type\":\"Question\",\"name\":\"Quelle est l'erreur la plus fr\u00e9quente de segmentation OT ?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Communications directes IT \u2194 OT sans passer par DMZ. Workstations m\u00e9tier acc\u00e9dant directement aux SCADA. Risque d'attaque lat\u00e9rale majeur.\"}}]}]}<\/script><br \/>\n[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[et_pb_section fb_built=\u00a0\u00bb1&Prime; _builder_version=\u00a0\u00bb4.27&Prime;][et_pb_row _builder_version=\u00a0\u00bb4.27&Prime;][et_pb_column type=\u00a0\u00bb4_4&Prime; _builder_version=\u00a0\u00bb4.27&Prime;][et_pb_text _builder_version=\u00a0\u00bb4.27&Prime;] Segmentation Purdue et OT\/IT en 2026 : architecture de s\u00e9curit\u00e9 industrielle Derni\u00e8re mise \u00e0 jour : 17 mai 2026. La segmentation r\u00e9seau selon le mod\u00e8le Purdue reste en 2026 le socle architectural de la cybers\u00e9curit\u00e9 industrielle. Cet article documente l&rsquo;architecture en 6 niveaux, l&rsquo;impl\u00e9mentation DMZ, et les pratiques [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":93807,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","ai_seo_title":"Segmentation Purdue OT\/IT 2026 : architecture DMZ industrielle | TeepTrak","ai_meta_description":"Guide complet 2026 de la segmentation Purdue : 6 niveaux (Level 0 \u00e0 5), DMZ Level 3.5, int\u00e9gration plateforme TRS, protocoles non chiffr\u00e9s, automates non patchables, 5 actions concr\u00e8tes.","ai_focus_keyword":"segmentation Purdue OT IT","footnotes":""},"categories":[1],"tags":[],"class_list":["post-93813","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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