{"id":105,"date":"2026-09-13T20:56:41","date_gmt":"2026-09-13T20:56:41","guid":{"rendered":"https:\/\/neranis.com\/?post_type=nrn_service&#038;p=105"},"modified":"2026-09-13T20:56:41","modified_gmt":"2026-09-13T20:56:41","slug":"protection-dns-et-filtrage-de-la-resolution-protectrice","status":"publish","type":"nrn_service","link":"https:\/\/neranis.com\/fr\/services\/dns-security-and-protective-resolution-filtering\/","title":{"rendered":"S\u00e9curit\u00e9 DNS et filtrage par r\u00e9solution protectrice"},"content":{"rendered":"<section class=\"wp-block-group nrn2-section nrn2-page-hero is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-breadcrumb wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/\">Accueil<\/a> <span aria-hidden=\"true\">\/<\/span> <a href=\"https:\/\/neranis.com\/fr\/expertise\/\">Expertise<\/a> \/ <a href=\"https:\/\/neranis.com\/fr\/expertise\/securite-des-reseaux\/\">S\u00e9curit\u00e9 des r\u00e9seaux<\/a><\/p>\n\n\n<div class=\"wp-block-group nrn2-service-top nrn2-hero-layout-r3 is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-hero-split-copy is-layout-flow wp-block-group-is-layout-flow\">\n\n<p class=\"nrn2-kicker wp-block-paragraph\">NET \/ NET-07<\/p>\n\n\n<h1 class=\"wp-block-heading nrn2-title\">S\u00e9curit\u00e9 DNS et filtrage par r\u00e9solution protectrice<\/h1>\n\n\n<p class=\"nrn2-lead wp-block-paragraph\">Prot\u00e9gez le service qui r\u00e9sout les noms de domaine et contr\u00f4lez les destinations r\u00e9solues par les appareils. Le service r\u00e9pond aux enjeux de disponibilit\u00e9 du DNS interne et de d\u00e9tection ou de blocage des domaines jug\u00e9s dangereux.<\/p>\n\n<\/div>\n\n\n<figure class=\"wp-block-image size-full nrn2-context-image nrn2-visual-asset-service-family-net\"><img loading=\"lazy\" decoding=\"async\" width=\"1600\" height=\"500\" src=\"https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-net.webp\" alt=\"\" class=\"wp-image-246\" srcset=\"https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-net.webp 1600w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-net-300x94.webp 300w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-net-1024x320.webp 1024w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-net-768x240.webp 768w, https:\/\/neranis.com\/wp-content\/uploads\/2026\/09\/service-family-net-1536x480.webp 1536w\" sizes=\"auto, (max-width: 1600px) 100vw, 1600px\" \/><\/figure>\n<\/div>\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-service-top is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-service-intro is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">QUAND C'EST UTILE<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Une r\u00e9ponse cibl\u00e9e<br>\u00e0 un besoin d\u00e9fini.<\/h2>\n\n\n<p class=\"nrn2-body-lg wp-block-paragraph\">Un contr\u00f4le inad\u00e9quat du DNS, des terminaux utilisant des r\u00e9solveurs externes, des alertes concernant des communications suspectes ou une d\u00e9pendance critique \u00e0 un DNS interne mal document\u00e9.<\/p>\n\n\n<div class=\"wp-block-buttons nrn2-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/neranis.com\/fr\/contact\/\">Discutez de ce service<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-facts is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">EN UN COUP D'\u0152IL<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>Famille<\/strong><br><a href=\"https:\/\/neranis.com\/fr\/expertise\/securite-des-reseaux\/\">S\u00e9curit\u00e9 des r\u00e9seaux<\/a><\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>Engagement<\/strong><br>Mise en \u0153uvre<\/p>\n\n\n<p class=\"wp-block-paragraph\"><strong>R\u00e9f\u00e9rence<\/strong><br>NET-07<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section nrn2-canvas is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">PORT\u00c9E ET R\u00c9SULTATS<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Ce que couvre la mission.<\/h2>\n\n<\/div>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-delivery-grid is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-delivery-card is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Port\u00e9e<\/h3>\n\n\n<ul class=\"wp-block-list nrn2-list\">\n<li>Architecture du syst\u00e8me de r\u00e9solution des conflits<\/li>\n\n\n<li>S\u00e9paration interne\/externe<\/li>\n\n\n<li>Contr\u00f4le des modifications<\/li>\n\n\n<li>filtrage<\/li>\n\n\n<li>D\u00e9boisement proportionn\u00e9<\/li>\n\n\n<li>acc\u00e8s administratif<\/li>\n\n\n<li>continuit\u00e9<\/li>\n\n\n<li>Traitement de l'utilisation de DNS chiffr\u00e9e<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-delivery-card is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Livrables<\/h3>\n\n\n<ul class=\"wp-block-list nrn2-list\">\n<li>Architecture du DNS<\/li>\n\n\n<li>politiques de r\u00e9solution<\/li>\n\n\n<li>configurations<\/li>\n\n\n<li>Liste des exceptions<\/li>\n\n\n<li>Proc\u00e9dures en cas d\u2019incident<\/li>\n\n\n<li>tests de r\u00e9solution et de failover<\/li>\n\n\n<li>Documentation de la zone sensible<\/li>\n\n<\/ul>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-delivery-card nrn2-evidence is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Preuve de r\u00e9ception<\/h3>\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9solution de l\u2019affaire est valid\u00e9e ; un domaine d\u2019essai convenu est bloqu\u00e9 ; l\u2019administration est prot\u00e9g\u00e9e ; la continuit\u00e9 est test\u00e9e ; les contournements connus sont document\u00e9s avec des mesures convenues.<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">LIVRAISON<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Comment le travail est structur\u00e9.<\/h2>\n\n<\/div>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-two-col is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-prose is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Approche<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Cartographier le trafic ; concevoir et dimensionner ; piloter ; migrer progressivement avec possibilit\u00e9 de retour arri\u00e8re ; tester et documenter les op\u00e9rations.<\/p>\n\n\n<h3 class=\"wp-block-heading\">Pr\u00e9requis et responsabilit\u00e9s<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Client : r\u00e9seau, applications, op\u00e9rateurs, fen\u00eatres de changement et acceptation m\u00e9tier. Fournisseur : conception, migration et tests. L'acc\u00e8s des tiers et l'inspection TLS n\u00e9cessitent des approbations appropri\u00e9es.<\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-prose is-layout-flow wp-block-group-is-layout-flow\">\n<h3 class=\"wp-block-heading\">Facteurs de port\u00e9e<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Sites, d\u00e9bit r\u00e9el inspect\u00e9, trafic, r\u00e8gles, utilisateurs distants, disponibilit\u00e9 et int\u00e9grations. Le mat\u00e9riel, les abonnements de s\u00e9curit\u00e9 et les op\u00e9rations r\u00e9currentes sont distincts.<\/p>\n\n\n<h3 class=\"wp-block-heading\">Questions \u00e0 clarifier<\/h3>\n\n\n<p class=\"wp-block-paragraph\">Qui administre les zones et les domaines ? Les terminaux peuvent-ils contourner les resolvers ? Quels services \u00e9chouent lors d\u2019une panne du DNS ?<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section nrn2-compact is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-boundaries is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">LIMITES IMPORTANTES<\/p>\n\n\n<p class=\"nrn2-body-lg wp-block-paragraph\">Le filtrage DNS ne d\u00e9tecte pas toutes les \u00e9changes et ne remplace pas les EDR ou les pare-feu. Le DNS chiffr\u00e9 et l\u2019acc\u00e8s direct \u00e0 l\u2019IP peuvent modifier sa port\u00e9e.<\/p>\n\n\n<p class=\"wp-block-paragraph\">Les modifications pr\u00e9servent les services essentiels et les parcours de r\u00e9tablissement. Le dimensionnement, les licences et les tests de recette refl\u00e8tent les fonctionnalit\u00e9s qui seront r\u00e9ellement activ\u00e9es.<\/p>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">EN PRATIQUE<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Situations illustratives.<\/h2>\n\n<\/div>\n\n\n<p class=\"nrn2-section-lead wp-block-paragraph\">Ces exemples d\u00e9crivent des engagements possibles et des r\u00e9sultats cibles. Il ne s'agit pas de r\u00e9f\u00e9rences clients ni de r\u00e9sultats obtenus.<\/p>\n\n<\/div>\n\n\n<details class=\"wp-block-details nrn2-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Sc\u00e9nario 01<\/summary>\n<p class=\"wp-block-paragraph\">Une entreprise dispose de configurations DNS diff\u00e9rentes pour ses sites. Probl\u00e8me : standardiser les r\u00e9pondeurs et appliquer un filtrage commun. Objectif : un comportement coh\u00e9rent et la r\u00e9solution des incidents qui permettent un diagnostic pr\u00e9cis.<\/p>\n\n<\/details>\n\n\n<details class=\"wp-block-details nrn2-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Sc\u00e9nario 02<\/summary>\n<p class=\"wp-block-paragraph\">Une organisation perd ses services lorsque son DNS principal tombe en panne. Projet : r\u00e9examen de la redondance, des sauvegardes et des contr\u00f4les de changement. R\u00e9sultats escompt\u00e9s : r\u00e9cup\u00e9ration v\u00e9rifi\u00e9e ; les d\u00e9pendances non redondantes restent identifi\u00e9es comme des risques n\u00e9cessitant une intervention.<\/p>\n\n<\/details>\n\n\n<details class=\"wp-block-details nrn2-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Contexte technologique et de r\u00e9f\u00e9rence<\/summary>\n<p class=\"wp-block-paragraph\">Exemples : resolvers internes s\u00e9curis\u00e9s et services de protection DNS ; l\u2019int\u00e9gration du pare-feu d\u00e9pend des abonnements et de l\u2019architecture.<\/p>\n\n\n<p class=\"wp-block-paragraph\">L'ensemble final des technologies est convenu lors du cadrage, sur la base de l'interop\u00e9rabilit\u00e9, des licences, des droits d'acc\u00e8s et des exigences op\u00e9rationnelles.<\/p>\n\n<\/details>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-section-heading is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">SERVICES CONNECT\u00c9S<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Construisez l'\u00e9tape suivante.<\/h2>\n\n<\/div>\n\n\n<p class=\"nrn2-section-lead wp-block-paragraph\">Ces services peuvent compl\u00e9ter la mission. Ils ne sont pas inclus automatiquement.<\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-related-grid is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-service-card is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-ref wp-block-paragraph\">PEN-02<\/p>\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/neranis.com\/fr\/services\/internal-and-assumed-breach-penetration-testing\/\">Tests d'intrusion internes et bas\u00e9s sur une compromission suppos\u00e9e<\/a><\/h3>\n\n\n<p class=\"nrn2-card-desc wp-block-paragraph\">Une \u00e9valuation de ce qu'un attaquant pourrait atteindre apr\u00e8s avoir obtenu un point d'ancrage interne initial, examinant les privil\u00e8ges excessifs et la faible s\u00e9paration.<\/p>\n\n\n<p class=\"nrn2-text-link wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/services\/internal-and-assumed-breach-penetration-testing\/\">D\u00e9couvrir ce service <span aria-hidden=\"true\">\u2197<\/span><\/a><\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-service-card is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-ref wp-block-paragraph\">NET-03<\/p>\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/neranis.com\/fr\/services\/detection-et-prevention-des-intrusions-dans-les-reseaux-ids-ip\/\">D\u00e9tection et pr\u00e9vention des intrusions sur le r\u00e9seau \u2014 IDS\/IPS<\/a><\/h3>\n\n\n<p class=\"nrn2-card-desc wp-block-paragraph\">Un IDS observe et alerte en cas d'activit\u00e9 suspecte ; un IPS peut \u00e9galement bloquer le trafic lorsqu'il est d\u00e9ploy\u00e9 en position de filtrage. Le service d\u00e9ploie, ajuste et connecte ces contr\u00f4les \u00e0 un processus de traitement.<\/p>\n\n\n<p class=\"nrn2-text-link wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/services\/detection-et-prevention-des-intrusions-dans-les-reseaux-ids-ip\/\">D\u00e9couvrir ce service <span aria-hidden=\"true\">\u2197<\/span><\/a><\/p>\n\n<\/div>\n\n\n<div class=\"wp-block-group nrn2-service-card is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-ref wp-block-paragraph\">SOC-03<\/p>\n\n\n<h3 class=\"wp-block-heading\"><a href=\"https:\/\/neranis.com\/fr\/services\/collecte-de-journaux-et-deploiement-du-siem\/\">Collecte des journaux et d\u00e9ploiement du SIEM<\/a><\/h3>\n\n\n<p class=\"nrn2-card-desc wp-block-paragraph\">Centraliser les \u00e9v\u00e9nements de s\u00e9curit\u00e9 utiles et les rendre exploitables pour la recherche, les alertes et les investigations. Le projet aborde la qualit\u00e9, les horodatages, la r\u00e9tention et le co\u00fbt tout autant que l'installation de la plateforme.<\/p>\n\n\n<p class=\"nrn2-text-link wp-block-paragraph\"><a href=\"https:\/\/neranis.com\/fr\/services\/collecte-de-journaux-et-deploiement-du-siem\/\">D\u00e9couvrir ce service <span aria-hidden=\"true\">\u2197<\/span><\/a><\/p>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>\n\n\n<section class=\"wp-block-group nrn2-section is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-wrap is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group nrn2-cta is-layout-flow wp-block-group-is-layout-flow\">\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-kicker wp-block-paragraph\">Commencer une conversation<\/p>\n\n\n<h2 class=\"wp-block-heading nrn2-h2\">Clarifiez la port\u00e9e.<\/h2>\n\n<\/div>\n\n\n<div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\">\n<p class=\"nrn2-body-lg wp-block-paragraph\">Nous clarifierons l'objectif, les d\u00e9pendances et les responsabilit\u00e9s de ce service avant de proposer la livraison.<\/p>\n\n\n<div class=\"wp-block-buttons nrn2-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link wp-element-button\" href=\"https:\/\/neranis.com\/fr\/contact\/\">Discutez de vos priorit\u00e9s<\/a><\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/div>\n\n<\/section>","protected":false},"excerpt":{"rendered":"<p>Prot\u00e9gez le service qui r\u00e9sout les noms de domaine et contr\u00f4lez les destinations r\u00e9solues par les appareils. Le service r\u00e9pond aux enjeux de disponibilit\u00e9 du DNS interne et de d\u00e9tection ou de blocage des domaines jug\u00e9s dangereux.<\/p>","protected":false},"featured_media":0,"template":"single-nrn_service","meta":{"footnotes":""},"nrn_family":[10],"class_list":["post-105","nrn_service","type-nrn_service","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service\/105","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service"}],"about":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/types\/nrn_service"}],"version-history":[{"count":2,"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service\/105\/revisions"}],"predecessor-version":[{"id":500,"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_service\/105\/revisions\/500"}],"wp:attachment":[{"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/media?parent=105"}],"wp:term":[{"taxonomy":"nrn_family","embeddable":true,"href":"https:\/\/neranis.com\/fr\/wp-json\/wp\/v2\/nrn_family?post=105"}],"curies":[{"name":"Bien jou\u00e9","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}