{"id":23265,"date":"2019-01-18T16:58:43","date_gmt":"2019-01-18T15:58:43","guid":{"rendered":"https:\/\/blog.wildix.com\/?p=23265"},"modified":"2019-01-18T17:11:15","modified_gmt":"2019-01-18T16:11:15","slug":"diagnostiquer-efficacement-problemes-reseau-partie-1","status":"publish","type":"post","link":"https:\/\/blog.wildix.com\/fr\/diagnostiquer-efficacement-problemes-reseau-partie-1\/","title":{"rendered":"Comment diagnostiquer efficacement les probl\u00e8mes r\u00e9seau ? (Partie 1)"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignleft\" src=\"https:\/\/scontent-mrs1-1.xx.fbcdn.net\/v\/t1.0-9\/43758079_298718417396031_5201726898975014912_n.jpg?_nc_cat=109&amp;_nc_ht=scontent-mrs1-1.xx&amp;oh=a4c481d16fefae99089d5c2b9ad98dea&amp;oe=5CBBBC11\" alt=\"Aucune description de photo disponible.\" width=\"309\" height=\"143\" \/>Vous \u00eates nombreux \u00e0 rencontrer des difficult\u00e9s pour diagnostiquer des probl\u00e8mes de r\u00e9seaux. Notamment parce que la taille et la complexit\u00e9 des r\u00e9seaux augmentent.<\/p>\n<p>Il faut ajouter que dans notre cas, la signalisation et la voix sont en plus des flux sensibles. Il s\u2019agit g\u00e9n\u00e9ralement de probl\u00e8mes de latences ou de d\u00e9gradation de la voix. Mais comment les diagnostiquer ?<\/p>\n<p><!--more--><\/p>\n<p>Voici la premi\u00e8re partie d&rsquo;une aide au diagnostic en quelques conseils et mise en garde :<\/p>\n<h3><strong>Les flux peuvent \u00eatre capturer sur :<\/strong><\/h3>\n<ul>\n<li>Le iPBX<\/li>\n<li>Les t\u00e9l\u00e9phones<\/li>\n<li>L\u2019op\u00e9rateur<\/li>\n<li>Des \u00e9quipement interm\u00e9diaire (routeur, firewall, switch\u2026).<\/li>\n<li>TAP (appareil de type \u00ab\u00a0man in the middle\u00a0\u00bb positionnable n\u2019importe o\u00f9 sur le r\u00e9seau). Il existe beaucoup de TAP (plus ou moins couteux) mais avec ce syst\u00e8me, pas besoin d\u2019avoir la main sur les \u00e9quipements (mode transparent). <span style=\"color: #ff0000;\"><strong>C\u2019est un \u00e9quipement indispensable !<\/strong><\/span><\/li>\n<\/ul>\n<h3><strong>Attention, vous pouvez capturer des mauvaises traces :<\/strong><\/h3>\n<ul>\n<li>Avec des flux trop important (router, firewall, switch\u2026).<\/li>\n<li>Des filtres de captures mal adapt\u00e9s.<\/li>\n<li>Avec les captures sur les postes, des trames peuvent \u00eatre perdus en capture sur le poste (si la data \u00e9crase la voix).<\/li>\n<li>En miroir \u00e9galement (si le switch est trop charg\u00e9 ou si le switch est le probl\u00e8me), il peut y avoir des saturations li\u00e9es au full duplex. Dans certains cas rares, si des trames sont \u00ab pourries \u00bb le switch va les \u00e9craser avant de les transf\u00e9rer au miroir.<\/li>\n<\/ul>\n<h2><strong>\u2028<\/strong><br \/>\n<strong><img decoding=\"async\" class=\"alignright\" src=\"https:\/\/www.rahisystems.com\/wp-content\/uploads\/2018\/06\/047157742.jpg\" alt=\"Related image\" width=\"278\" height=\"148\" \/>INDICATEUR DE PERFORMANCE RESEAU<\/strong><\/h2>\n<p><strong>On peut d\u00e9finir par 4 valeurs les performances d\u2019un r\u00e9seau :\u2028<\/strong><\/p>\n<ol>\n<li>La bande passante en TCP<\/li>\n<li>La latence ou le temps aller\/retour d&rsquo;un paquet<\/li>\n<li>La gigue (jitter) est la variation de latence. Les paquets arrivent de mani\u00e8re irr\u00e9guli\u00e8re en fonction du traffic r\u00e9seau<\/li>\n<li>Le taux de perte en UDP<\/li>\n<\/ol>\n<p>La bande passante d\u00e9termine la \u00ab\u00a0grosseur du tuyau\u00a0\u00bb et donc le d\u00e9bit maximum th\u00e9orique de celui-ci.<br \/>\nLa latence d\u00e9fini le d\u00e9lai d&rsquo;aller-retour d&rsquo;une information transmise sur le r\u00e9seau informatique. Elle peut \u00eatre mesur\u00e9e \u00e0 l&rsquo;aide de la commande ping.<br \/>\nLa gigue est la variation de la latence. Les paquets arrivent de mani\u00e8re irr\u00e9guli\u00e8re en fonction du traffic r\u00e9seau. Elle est donc d\u00e9terminante dans le cas de la VoIP, plus la gigue augmente plus la conversation devient hach\u00e9e.<br \/>\nLe taux de perte oblige \u00e0 la retransmission des donn\u00e9es, elle affecte consid\u00e9rablement donc la qualit\u00e9 du lien r\u00e9seau.<\/p>\n<h3><strong>Les valeurs \u00e0 respect\u00e9es pour consid\u00e9rer un r\u00e9seau de qualit\u00e9 :<\/strong><\/h3>\n<ul>\n<li>Sur un r\u00e9seau local : Perte &lt; 0.5%, d\u00e9lais &lt; 10 ms, Gigue &lt; 5 ms<\/li>\n<li>Sur un r\u00e9seau Wan : Perte &lt; 1%, d\u00e9lais &lt; 40 ms, Gigue &lt; 10 ms<\/li>\n<li>Sur Internet (ou VPN sur Internet) : Perte &lt; 2%, d\u00e9lais &lt; 100 ms, Gigue &lt; 30 ms<\/li>\n<\/ul>\n<p>Avec un sch\u00e9ma, de la m\u00e9thodologie et une bonne dose de patience : tout se passera bien!\u00a0<span class=\"emoji-inline \">?<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Vous \u00eates nombreux \u00e0 rencontrer des difficult\u00e9s pour diagnostiquer des probl\u00e8mes de r\u00e9seaux. Notamment parce que la taille et la complexit\u00e9 des r\u00e9seaux augmentent. Il faut ajouter que dans notre cas, la signalisation et la voix sont en plus des flux sensibles. Il s\u2019agit g\u00e9n\u00e9ralement de probl\u00e8mes de latences ou de d\u00e9gradation de la voix. &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/blog.wildix.com\/fr\/diagnostiquer-efficacement-problemes-reseau-partie-1\/\" class=\"more-link\">Continuer la lecture<span class=\"screen-reader-text\"> de &laquo;&nbsp;Comment diagnostiquer efficacement les probl\u00e8mes r\u00e9seau ? (Partie 1)&nbsp;&raquo;<\/span><\/a><\/p>\n","protected":false},"author":522,"featured_media":23289,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[80],"tags":[],"class_list":["post-23265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-infostechniques"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Comment diagnostiquer efficacement les probl\u00e8mes r\u00e9seau ? (Partie 1) | Wildix<\/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:\/\/blog.wildix.com\/fr\/diagnostiquer-efficacement-problemes-reseau-partie-1\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comment diagnostiquer efficacement les probl\u00e8mes r\u00e9seau ? (Partie 1) | Wildix\" \/>\n<meta property=\"og:description\" content=\"Vous \u00eates nombreux \u00e0 rencontrer des difficult\u00e9s pour diagnostiquer des probl\u00e8mes de r\u00e9seaux. Notamment parce que la taille et la complexit\u00e9 des r\u00e9seaux augmentent. Il faut ajouter que dans notre cas, la signalisation et la voix sont en plus des flux sensibles. Il s\u2019agit g\u00e9n\u00e9ralement de probl\u00e8mes de latences ou de d\u00e9gradation de la voix. &hellip; Continuer la lecture de &laquo;&nbsp;Comment diagnostiquer efficacement les probl\u00e8mes r\u00e9seau ? 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