{"id":562,"date":"2013-10-24T21:54:34","date_gmt":"2013-10-24T20:54:34","guid":{"rendered":"http:\/\/www.netexpertise.eu\/fr\/?p=562"},"modified":"2021-10-11T21:18:45","modified_gmt":"2021-10-11T20:18:45","slug":"relais-dhcp-sur-cisco-catatyst-2960","status":"publish","type":"post","link":"http:\/\/www.netexpertise.eu\/fr\/reseau\/cisco\/relais-dhcp-sur-cisco-catatyst-2960.html","title":{"rendered":"Relais DHCP sur un Switch Cisco Catalyst 2960"},"content":{"rendered":"\n<p>Avoir un relais DHCP sur un switch niveau 2 peut para\u00eetre absurde. Je me suis retrouv\u00e9 avec un serveur DHCP plant\u00e9 sans avoir la main sur la configuration du routeur qui appartenait au FAI, tout cela sur un site distant.<br>C&rsquo;\u00e9tait donc ma seule option pour \u00e9viter un changement massif pour des IPs statiques.<br>Certains diront que le mat\u00e9riel de niveau 2 ne peut pas g\u00e9rer le DHCP mais voyez plut\u00f4t, \u00e7a fait partie de la liste des <a href=\"http:\/\/www.cisco.com\/en\/US\/prod\/collateral\/switches\/ps5718\/ps6406\/prod_presentation_c97-494780.pdf\">fonctionalit\u00e9s<\/a> du Catalyst 2960 de <a href=\"\/fr\/category\/reseau\/cisco\">Cisco<\/a>&#8230; Ca fonctionne m\u00eame sur un mod\u00e8le \u00e9quip\u00e9 d&rsquo;une image LAN base.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img src=\"\/images\/Cisco_catalyst_dhcp_relay.png\" alt=\"Relais DHCP sur Cisco Catalyst\"\/><\/figure>\n\n\n\n<p>J&rsquo;ai tout d&rsquo;abord cr\u00e9\u00e9 une nouvelle \u00e9tendue sur le serveur DHCP Windows de mon site principal dont l&rsquo;adresse IP est 192.168.15.240.<br>&nbsp;<br><\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img src=\"\/images\/Windows_DHCP_Relay_Scope.png\" alt=\"Plages DHCP sur Windows\"\/><\/figure><\/div>\n\n\n\n<p><br>Et voici comment j&rsquo;ai configur\u00e9 mon Cisco 2960: petit site, un vlan (VLAN 50), tous les ports dans le m\u00eame vlan<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"json\" class=\"language-json\">interface Vlan50\n ip address 192.168.50.11 255.255.255.0\n no ip route-cache\n!\nip default-gateway 192.168.50.254\n\nservice dhcp\n\nip dhcp pool My_Dhcp_Pool\n   relay source 192.168.50.0 255.255.255.0\n   relay destination 192.168.15.240\n!<\/code><\/pre>\n\n\n\n<p>&nbsp;<br>Assurez-vous d&rsquo;avoir la connectivit\u00e9 vers le serveur DHCP<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"json\" class=\"language-json\">commutateur# ping 192.168.15.240\n\nType escape sequence to abort.\nSending 5, 100-byte ICMP Echos to 192.168.15.240, timeout is 2 seconds:\n!!!!!\nSuccess rate is 100 percent (5\/5), round-trip min\/avg\/max = 33\/42\/59 ms<\/code><\/pre>\n\n\n\n<p>&nbsp;<br>L&rsquo;interface vlan du switch doit \u00eatre configur\u00e9e avec une adresse IP et un masque r\u00e9seau appropri\u00e9s. Elle doit ensuite \u00eatre activ\u00e9e avec la commande no shutdown.<br>Comme le switch n&rsquo;a qu&rsquo;une seule interface, il ne peut fournir des IPs que sur une plage unique. Je ne pense pas qu&rsquo;une requ\u00eate DHCP re\u00e7ue sur un port affect\u00e9 \u00e0 un vlan diff\u00e9rent obtienne une r\u00e9ponse, je ne l&rsquo;ai pas test\u00e9 par contre.<br>&nbsp;<br>D\u00e9sactivez le relais DHCP si vous n&rsquo;en avez plus besoin<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"json\" class=\"language-json\">no service dhcp<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Avoir un relais DHCP sur un switch niveau 2 peut para\u00eetre absurde. Je me suis retrouv\u00e9 avec un serveur DHCP plant\u00e9 sans avoir la main sur la configuration du routeur qui appartenait au FAI, tout cela sur un site distant.C&rsquo;\u00e9tait donc ma seule option pour \u00e9viter un changement massif pour des IPs statiques.Certains diront que [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[20],"tags":[408,385,107,449],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Netexpertise - Relais DHCP sur un Switch Cisco Catalyst 2960<\/title>\n<meta name=\"description\" content=\"Configurez un switch Cisco Catalyst 2960 de niveau 2 en tant que relais DHCP d&#039;un serveur Windows, c&#039;est possible!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.netexpertise.eu\/fr\/reseau\/cisco\/relais-dhcp-sur-cisco-catatyst-2960.html\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Netexpertise - 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