
{"id":566,"date":"2020-12-30T02:49:21","date_gmt":"2020-12-30T01:49:21","guid":{"rendered":"https:\/\/parlonstechs.com\/all\/?p=566"},"modified":"2022-09-25T21:42:41","modified_gmt":"2022-09-25T19:42:41","slug":"quest-ce-quun-vpn-et-a-quoi-cela-sert-il","status":"publish","type":"post","link":"https:\/\/parlonstechs.com\/all\/2020\/12\/30\/quest-ce-quun-vpn-et-a-quoi-cela-sert-il\/","title":{"rendered":"Qu\u2019est-ce qu\u2019un VPN et \u00e0 quoi cela sert-il ?"},"content":{"rendered":"\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/cdn.futura-sciences.com\/buildsv6\/images\/mediumoriginal\/1\/1\/5\/11575022f8_134796_virtual-private-network-01.jpg\" alt=\"Connexion \u00e0 un VPN, \u00a9 Adobe Stock\"\/><\/figure>\n\n\n\n<p style=\"font-size:24px\"><strong>Pour surfer de mani\u00e8re anonyme, se connecter depuis l&rsquo;ext\u00e9rieur \u00e0 votre r\u00e9seau d&rsquo;entreprise ou contourner les limitations de contenu \u00e0 l&rsquo;\u00e9tranger, un VPN s&rsquo;av\u00e8re incontournable. Revenons sur la technologie et ses usages !<\/strong><\/p>\n\n\n\n<p>Qu&rsquo;est-ce qu&rsquo;un&nbsp;<strong>VPN<\/strong>&nbsp;? Derri\u00e8re les initiales VPN se cachent trois mots explicites&nbsp;:&nbsp;<em>Virtual Private Network<\/em>. Le VPN est un r\u00e9seau priv\u00e9 virtuel qui \u00e9tablit une connexion s\u00e9curis\u00e9e, en utilisant pour cela un protocole d&rsquo;encapsulation (<em>tunneling protocol<\/em>&nbsp;en anglais). <\/p>\n\n\n\n<p>Celui-ci va transmettre les donn\u00e9es,&nbsp;comme si l&rsquo;on utilisait un c\u00e2ble r\u00e9seau virtuel entre votre machine et un&nbsp;<a href=\"https:\/\/parlonstechs.com\/all\/2020\/12\/17\/serveur-quest-ce-que-cest\/\">serveur<\/a>, sans \u00eatre \u00ab&nbsp;visible&nbsp;\u00bb sur l&rsquo;ensemble du r\u00e9seau, et avec des possibilit\u00e9s int\u00e9ressantes, notamment le changement de votre&nbsp;<a href=\"https:\/\/parlonstechs.com\/all\/2020\/12\/17\/adresse-ip-quest-ce-que-cest\/\">adresse IP<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Toutes les formes d&rsquo;un VPN<\/h2>\n\n\n\n<p>Un VPN peut prendre plusieurs formes. Il peut \u00eatre int\u00e9gr\u00e9 au&nbsp;<strong>pare-feu<\/strong>&nbsp;d&rsquo;une entreprise ou \u00eatre fourni sous la forme d&rsquo;un service en ligne, disponible par abonnement, qui est une formule privil\u00e9gi\u00e9e pour les particuliers. De nombreux fournisseurs existent, offrant des prestations vari\u00e9es qui m\u00e9ritent d&rsquo;\u00eatre compar\u00e9es avec soin.<\/p>\n\n\n\n<p>Plusieurs protocoles d&rsquo;encapsulation existent, et offrent des degr\u00e9s divers de s\u00e9curisation. Le PPTP (<em>Point to Point Tunnel Protocol)<\/em>&nbsp;a \u00e9t\u00e9 invent\u00e9 par&nbsp;Microsoft. Sa s\u00e9curisation minimale fait pr\u00e9f\u00e9rer des protocoles plus avanc\u00e9s dans ce domaine comme L2TP (<em>Layer 2 Tunneling Protocol<\/em>) ou le protocole libre&nbsp;<em>OpenVPN<\/em>&nbsp;qui int\u00e8gre le&nbsp;<strong>chiffrement<\/strong>&nbsp;SSL, utilis\u00e9 sur la plupart des services de VPN en ligne.<\/p>\n\n\n\n<p>Le chiffrement des donn\u00e9es implique, en revanche, un impact sur les performances de la connexion. On ne peut pas avoir la s\u00e9curisation \u00e0 l&rsquo;extr\u00eame et le&nbsp;<strong>d\u00e9bit<\/strong>&nbsp;maximal.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Quels usages pour un VPN&nbsp;?<\/h2>\n\n\n\n<p>Pour un usage priv\u00e9, plusieurs cas de figure peuvent \u00eatre envisag\u00e9s. Le plus \u00e9vident est le contournement des restrictions de contenus qu&rsquo;un service peut appliquer \u00e0 certains pays. Exemple typique&nbsp;: les services de&nbsp;<strong>VOD<\/strong>&nbsp;comme&nbsp;<strong>Netflix<\/strong>&nbsp;et de replay TV g\u00e8rent des droits audiovisuels qui ne peuvent souvent pas d\u00e9passer certains territoires. Vous souhaitez regarder une&nbsp;\u00e9mission&nbsp;que vous avez manqu\u00e9e sur votre cha\u00eene de&nbsp;TV&nbsp;pr\u00e9f\u00e9r\u00e9e&nbsp;? \u00c7a n&rsquo;est pas toujours possible depuis l&rsquo;\u00e9tranger sans passer par un VPN. \u00c0&nbsp;l&rsquo;inverse, vous pouvez utiliser ce type de service pour acc\u00e9der \u00e0 des contenus indisponibles dans votre pays de r\u00e9sidence. Attention&nbsp;: les services concern\u00e9s appliquent de plus en plus souvent des parades pour emp\u00eacher ce contournement.<\/p>\n\n\n\n<p>Plus g\u00e9n\u00e9ralement, le VPN est un moyen de passer outre des restrictions plus graves comme la censure impos\u00e9e par un \u00c9tat. Si vous voyagez en Chine, par exemple, vous aurez besoin d&rsquo;un VPN pour vous connecter \u00e0 des services inaccessibles autrement. <\/p>\n\n\n\n<p>Un <strong>VPN<\/strong> vous permet de changer d&rsquo;adresse IP et ainsi&nbsp;de garantir un relatif anonymat. Le VPN est d&rsquo;ailleurs aussi un moyen d&rsquo;acc\u00e9der \u00e0 des donn\u00e9es sensibles en r\u00e9duisant le risque de vol d&rsquo;information par des pirates. Certains \u00e9diteurs d&rsquo;<strong>antivirus<\/strong>&nbsp;proposent m\u00eame des options VPN dans ce but.<\/p>\n\n\n\n<p>Dans le cadre professionnel, l&rsquo;usage le plus fr\u00e9quent d&rsquo;un VPN est la connexion \u00e0 son r\u00e9seau d&rsquo;entreprise&nbsp;depuis n&rsquo;importe quel&nbsp;ordinateur&nbsp;hors de celui-ci. Pas besoin d&rsquo;un service tiers pour cela&nbsp;: c&rsquo;est l&rsquo;entreprise qui g\u00e8re directement le r\u00e9seau et fournit les identifiants aux collaborateurs. En revanche, vous pourrez avoir besoin d&rsquo;un service VPN sur votre lieu de travail, pour acc\u00e9der \u00e0 des contenus restreints par votre entreprise. Mais si vous pouvez avoir ce besoin occasionnel, n&rsquo;en abusez pas et respectez les r\u00e8gles de votre employeur&nbsp;!<\/p>\n\n\n\n<p>Avec Futura<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour surfer de mani\u00e8re anonyme, se connecter depuis l&rsquo;ext\u00e9rieur \u00e0 votre r\u00e9seau d&rsquo;entreprise ou contourner les limitations de contenu \u00e0 l&rsquo;\u00e9tranger, un VPN s&rsquo;av\u00e8re incontournable. Revenons sur la technologie et [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":567,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21,155,117,11],"tags":[],"class_list":["post-566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualite","category-affiche","category-ckoi","category-cybersecurite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Qu\u2019est-ce qu\u2019un VPN et \u00e0 quoi cela sert-il ? - Parlons Techs - Store<\/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:\/\/parlonstechs.com\/all\/2020\/12\/30\/quest-ce-quun-vpn-et-a-quoi-cela-sert-il\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Qu\u2019est-ce qu\u2019un VPN et \u00e0 quoi cela sert-il ?\" \/>\n<meta property=\"og:description\" content=\"Pour surfer de mani\u00e8re anonyme, se connecter depuis l&#039;ext\u00e9rieur \u00e0 votre r\u00e9seau d&#039;entreprise ou contourner les limitations de contenu \u00e0 l&#039;\u00e9tranger, un VPN s&#039;av\u00e8re incontournable. 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