{"id":26566,"date":"2022-04-20T17:27:00","date_gmt":"2022-04-20T15:27:00","guid":{"rendered":"https:\/\/perseus.de\/pare-feu\/"},"modified":"2026-03-30T10:04:58","modified_gmt":"2026-03-30T08:04:58","slug":"pare-feu","status":"publish","type":"post","link":"https:\/\/perseus.de\/fr\/pare-feu\/","title":{"rendered":"Pare-feu"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"26566\" class=\"elementor elementor-26566 elementor-22261\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cab3f18 e-flex e-con-boxed e-con e-parent\" data-id=\"cab3f18\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-2a02b8b e-con-full e-flex e-con e-child\" data-id=\"2a02b8b\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4f80ded elementor-widget__width-initial elementor-widget elementor-widget-heading\" data-id=\"4f80ded\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Pare-feu<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2d061a7 elementor-widget elementor-widget-image\" data-id=\"2d061a7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/05\/Headerbild-Glossary-Page-300x300.png\" class=\"attachment-medium size-medium wp-image-25818\" alt=\"\" srcset=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/05\/Headerbild-Glossary-Page-300x300.png 300w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/05\/Headerbild-Glossary-Page-150x150.png 150w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/05\/Headerbild-Glossary-Page-768x768.png 768w, https:\/\/perseus.de\/wp-content\/uploads\/2025\/05\/Headerbild-Glossary-Page.png 800w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4650348 e-flex e-con-boxed e-con e-parent\" data-id=\"4650348\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-7c452dd7 e-con-full e-flex e-con e-child\" data-id=\"7c452dd7\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e839854 elementor-widget elementor-widget-text-editor\" data-id=\"e839854\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<header class=\"Single__header Background Background--lightBlue\"><div class=\"container\"><div class=\"grid grid--size12 grid--size6D\"><div class=\"Share\"><div class=\"Module Text Background Background--lightBlue\"><div class=\"container\"><div class=\"grid grid--size12 grid--size8T\"><div class=\"Module Text Background Background--lightBlue\"><div class=\"container\"><div class=\"grid grid--size12 grid--size8T\"><p>Un pare-feu, similaire \u00e0 un pare-feu qui prot\u00e8ge un b\u00e2timent contre l\u2019incendie, prot\u00e8ge votre r\u00e9seau contre les acc\u00e8s ind\u00e9sirables en faisant surveiller le trafic par un programme selon des r\u00e8gles pr\u00e9d\u00e9finies et en ne transf\u00e9rant que les donn\u00e9es conformes aux r\u00e8gles. Ce programme peut \u00eatre install\u00e9 directement sur votre ordinateur ou \u2013 sous forme de pare-feu externe \u2013 sur des appareils s\u00e9par\u00e9s, comme votre routeur. <\/p><h4> <\/h4><h4>Que signifie en d\u00e9tail le terme pare-feu ?<\/h4><div> <\/div><p>Dans les r\u00e9seaux informatiques, le trafic de donn\u00e9es passe par les ports dits d\u2019informatique. Il y en a plus de 65 000 au total ; les fonctions les plus courantes ont des ports fixes assign\u00e9s. Par exemple, le port 587 est destin\u00e9 aux e-mails entrants provenant d\u2019exp\u00e9diteurs authentifi\u00e9s, et le port 443 pour l\u2019acc\u00e8s \u00e0 un site web s\u00e9curis\u00e9. Ces ports ne peuvent \u00eatre utilis\u00e9s que par le programme qui leur est assign\u00e9. Votre pare-feu surveille ce trafic. Il v\u00e9rifie le statut, le port, le protocole et l\u2019adresse du serveur, entre autres. Par exemple, si un protocole non autoris\u00e9 est utilis\u00e9, le pare-feu bloque le trafic de donn\u00e9es.      <\/p><p>Et les ports qui ne sont pas assign\u00e9s en dur ? Celles-ci peuvent \u00eatre utilis\u00e9es de mani\u00e8re flexible. Dans le cadre de cette utilisation, le port est ouvert pour le trafic de donn\u00e9es et, id\u00e9alement, referm\u00e9. <a href=\"https:\/\/perseus.de\/2022\/04\/22\/offene-ports\/\">Les ports qui restent ouverts apr\u00e8s la fin de l\u2019\u00e9change de donn\u00e9es<\/a> repr\u00e9sentent un risque de s\u00e9curit\u00e9. Parce qu\u2019ils correspondent \u00e0 une porte ouverte pour <a href=\"http:\/\/52.57.197.213\/2022\/04\/20\/hacker\/\">les hackers<\/a> criminels. C\u2019est pourquoi votre pare-feu v\u00e9rifie votre syst\u00e8me pour d\u00e9tecter des ports ouverts qui ne sont pas n\u00e9cessaires et les ferme.    <\/p><p>Gr\u00e2ce \u00e0 leur succ\u00e8s, les pare-feux sont d\u00e9sormais largement utilis\u00e9s. La plupart des routeurs en ont un, tout comme les smartphones. Pour les r\u00e9seaux d\u2019entreprise, il existe m\u00eame des dispositifs sp\u00e9ciaux sur lesquels sont install\u00e9s des programmes de pare-feu tr\u00e8s complexes. Ces \u00e9l\u00e9ments font souvent bien plus que ce qui est expliqu\u00e9 ici. Par exemple, vous pouvez \u00e9galement v\u00e9rifier le contenu des donn\u00e9es transmises (inspection approfondie des paquets).    <\/p><h4> <\/h4><h4>O\u00f9 est-ce que je rencontre des pare-feux dans mon travail quotidien ?<\/h4><div> <\/div><p>Dans le meilleur des cas, vous ne remarquerez m\u00eame pas votre pare-feu dans votre travail quotidien. Vous recevrez toutes les donn\u00e9es que vous demandez car elles respectent les r\u00e8gles du pare-feu. Ce que vous ne remarquez pas, c\u2019est que pendant que vous travaillez, un serveur sur Internet envoie des donn\u00e9es vers un port de votre r\u00e9seau. Cependant, il existe une r\u00e8gle de pare-feu pour l\u2019adresse de ce serveur : les donn\u00e9es provenant de ce serveur ne doivent pas \u00eatre accept\u00e9es. Votre pare-feu respecte cette r\u00e8gle et rejette ces donn\u00e9es. Indemne de cette attaque potentielle, vous continuez \u00e0 travailler jusqu\u2019\u00e0 la fin de la journ\u00e9e.     <\/p><h4> <\/h4><h4>Que puis-je faire pour am\u00e9liorer ma s\u00e9curit\u00e9 ?<\/h4><div> <\/div><p><strong>Sur le routeur<\/strong><\/p><p><b><br><\/b>Le plus souvent, vous serez confront\u00e9 au sujet du pare-feu en lien avec votre routeur. Ici, n\u2019ouvrez pas les connexions sur le pare-feu de votre routeur ni n\u2019autorisez les connexions directes depuis Internet \u00e0 votre ordinateur \u00e0 moins d\u2019avoir une tr\u00e8s bonne raison et de conna\u00eetre les risques (c\u2019est souvent la solution recommand\u00e9e pour faire fonctionner certains jeux en ligne). Cependant, ce n\u2019est pas bon pour une entreprise). <\/p><p><strong>Soyez attentif aux mises \u00e0 jour<\/strong><\/p><p><b><br><\/b>Si vous g\u00e9rez votre informatique vous-m\u00eame, soyez tr\u00e8s attentif aux <a href=\"http:\/\/52.57.197.213\/2022\/04\/26\/update\/\">mises \u00e0 jour<\/a> \u2013 m\u00eame pour vos ordinateurs personnels. Cela garantit que la liste des adresses de serveur non fiables, par exemple, est \u00e0 jour. <\/p><p><strong>Montrez de l\u2019int\u00e9r\u00eat et apprenez-en plus<\/strong><\/p><p><b><br><\/b>N\u2019h\u00e9sitez pas \u00e0 demander \u00e0 Perseus ou \u00e0 votre repr\u00e9sentant informatique quels pare-feux sont actifs dans votre r\u00e9seau et \u00e0 quoi servent. Si vous voulez savoir quelle est la puissance de votre pare-feu, faites-le tester. <\/p><p><strong>Fonctionnalit\u00e9s sp\u00e9ciales de Windows<\/strong><\/p><p><b><br><\/b>Si vous avez Windows, il est \u00e9quip\u00e9 d\u2019un pare-feu activ\u00e9 par d\u00e9faut. Laisse-le activ\u00e9. <\/p><p><strong>Fonctionnalit\u00e9s sp\u00e9ciales pour Mac<\/strong><\/p><p><b><br><\/b>Si vous utilisez un Mac, il est livr\u00e9 avec un pare-feu, qui est d\u00e9sactiv\u00e9 par d\u00e9faut. Activez cela dans les param\u00e8tres de s\u00e9curit\u00e9 syst\u00e8me. <\/p><p><strong>Fonctionnalit\u00e9s sp\u00e9ciales pour les fournisseurs tiers<\/strong><\/p><p><b><br><\/b>Si vous utilisez un pare-feu tiers fourni avec votre antivirus, assurez-vous qu\u2019il est \u00e0 jour.<\/p><p><strong>Avertissements du pare-feu<\/strong><\/p><p><b><br><\/b>Dans tous les cas, si vous voyez des avertissements du programme de pare-feu concernant des programmes essayant de se connecter \u00e0 Internet sans que vous ne soyez pas au courant, ne les laissez pas se connecter.<\/p><p><strong>Rendre les pare-feux plus stricts<\/strong><\/p><p><b><br><\/b>Vous pouvez aussi demander \u00e0 rendre le pare-feu plus strict en ajustant les r\u00e8gles. Cette approche est particuli\u00e8rement recommand\u00e9e pour les zones sensibles de votre entreprise. De nombreux pare-feux fonctionnent selon le principe \u00ab tout ce qui n\u2019est pas interdit est permis \u00bb, ce qui les rend presque imperceptibles dans le travail quotidien. Plus votre pare-feu repose sur le principe oppos\u00e9 \u2013 \u00ab Tout ce qui n\u2019est pas autoris\u00e9 est interdit \u00bb \u2013 plus il est s\u00e9curis\u00e9. Cependant, elle est beaucoup plus pr\u00e9sente dans le travail quotidien \u00e0 cause de demandes et de donn\u00e9es \u00e9ventuellement bloqu\u00e9es.    <\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/header>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cb1ddf2 e-flex e-con-boxed e-con e-parent\" data-id=\"cb1ddf2\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8b434eb elementor-widget-divider--view-line elementor-widget elementor-widget-divider\" data-id=\"8b434eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"divider.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-divider\">\n\t\t\t<span class=\"elementor-divider-separator\">\n\t\t\t\t\t\t<\/span>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Pare-feu Un pare-feu, similaire \u00e0 un pare-feu qui prot\u00e8ge un b\u00e2timent contre l\u2019incendie, prot\u00e8ge votre r\u00e9seau contre les acc\u00e8s ind\u00e9sirables en faisant surveiller le trafic par un programme selon des r\u00e8gles pr\u00e9d\u00e9finies et en ne transf\u00e9rant que les donn\u00e9es conformes aux r\u00e8gles. Ce programme peut \u00eatre install\u00e9 directement sur votre ordinateur ou \u2013 sous forme [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[58],"tags":[],"class_list":["post-26566","post","type-post","status-publish","format-standard","hentry","category-cyberlexique"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pare-feu - Perseus Technologies<\/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:\/\/perseus.de\/fr\/pare-feu\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pare-feu - Perseus Technologies\" \/>\n<meta property=\"og:description\" content=\"Pare-feu Un pare-feu, similaire \u00e0 un pare-feu qui prot\u00e8ge un b\u00e2timent contre l\u2019incendie, prot\u00e8ge votre r\u00e9seau contre les acc\u00e8s ind\u00e9sirables en faisant surveiller le trafic par un programme selon des r\u00e8gles pr\u00e9d\u00e9finies et en ne transf\u00e9rant que les donn\u00e9es conformes aux r\u00e8gles. Ce programme peut \u00eatre install\u00e9 directement sur votre ordinateur ou \u2013 sous forme [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/perseus.de\/fr\/pare-feu\/\" \/>\n<meta property=\"og:site_name\" content=\"Perseus Technologies\" \/>\n<meta property=\"article:published_time\" content=\"2022-04-20T15:27:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-03-30T08:04:58+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/perseus.de\/wp-content\/uploads\/2025\/05\/Headerbild-Glossary-Page.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"800\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Xenia Silbe\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Xenia Silbe\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/\"},\"author\":{\"name\":\"Xenia Silbe\",\"@id\":\"https:\\\/\\\/perseus.de\\\/#\\\/schema\\\/person\\\/42cdb0ff9720a4c92a2613f686b32f46\"},\"headline\":\"Pare-feu\",\"datePublished\":\"2022-04-20T15:27:00+00:00\",\"dateModified\":\"2026-03-30T08:04:58+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/\"},\"wordCount\":898,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/perseus.de\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/perseus.de\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/Headerbild-Glossary-Page-300x300.png\",\"articleSection\":[\"Cyberlexique\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/\",\"url\":\"https:\\\/\\\/perseus.de\\\/fr\\\/pare-feu\\\/\",\"name\":\"Pare-feu - 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