{"id":1664,"date":"2019-10-16T11:05:16","date_gmt":"2019-10-16T07:35:16","guid":{"rendered":"https:\/\/airoserver.com\/?p=1664"},"modified":"2022-04-04T09:10:47","modified_gmt":"2022-04-04T04:40:47","slug":"what-is-dhcp-server","status":"publish","type":"post","link":"https:\/\/airoserver.com\/de\/engagiert\/was-ist-ein-dhcp-server\/","title":{"rendered":"Was ist ein DHCP-Server?"},"content":{"rendered":"<p class=\"wp-block-paragraph\">In unseren fr\u00fcheren Beitr\u00e4gen haben wir Folgendes er\u00f6rtert <a href=\"https:\/\/airoserver.com\/de\/blog\/what-is-ip\/\">IP<\/a> vollst\u00e4ndig. Wir haben gesagt, dass jedes Ger\u00e4t, das einem Netz beitreten will, eine IP erh\u00e4lt. Aber woher wissen diese Ger\u00e4te, welche IP sie bekommen sollen? Hier kann uns DHCP helfen.<\/p>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>IP-Zuweisung<\/strong><\/h4>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Es gibt zwei M\u00f6glichkeiten, den Ger\u00e4ten IPs zuzuweisen:<\/p>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li><strong>Statisch:<\/strong> m\u00fcssen Sie alle im Netz verwendeten IPs durchgehen, um sicherzustellen, dass sie nicht belegt sind, und dem Ger\u00e4t dann eine nicht belegte IP zuweisen. Sie sollten auch darauf achten, eine IP zu w\u00e4hlen, die die richtige <a href=\"https:\/\/airoserver.com\/de\/engagiert\/was-ist-eine-subnetzmaske\/\" target=\"_blank\" rel=\"noreferrer noopener\">Netz-ID<\/a> um in diesem Netz sichtbar zu sein.<\/li>\r\n<li><strong>Dynamisch:<\/strong> Dies bedeutet, dass einem Ger\u00e4t, das sich mit einem Netzwerk verbindet, automatisch eine IP zugewiesen wird. Aber was bewirkt diese automatische Zuweisung?<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>DHCP<\/strong><\/h4>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Ein DHCP-Server ist ein Netzwerkserver, der den Client-Ger\u00e4ten automatisch IP-Adressen, Standard-Gateways und andere Netzwerkparameter zuweist. Er basiert auf dem Dynamic Host Configuration Protocol (DHCP), um auf Broadcast-Anfragen von Clients zu antworten.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">DHCP kann also die IP-Zuweisung und -Verwaltung in einem Netz vereinfachen. Stellen Sie sich vor, Sie haben 30 verschiedene Client-Ger\u00e4te an einem Ort und wollen, dass sie alle im selben Netzwerk sind. Um dies zu erreichen, m\u00fcssen Sie ihnen allen IPs mit derselben Netzwerk-ID zuweisen. Nat\u00fcrlich ist es sehr zeitaufw\u00e4ndig, dies manuell zu tun, und deshalb k\u00f6nnen Sie, anstatt jedes Ger\u00e4t einzeln zu \u00fcberpr\u00fcfen und ihm eine IP zuzuweisen, einen DHCP-Server einsetzen, der dies f\u00fcr Sie erledigt.<\/p>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Wie funktioniert das?<\/strong><\/h4>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Die Phasen der IP-Zuweisung durch DHCP werden als DORA bezeichnet: Discovery, Offer, Request, and Acknowledgment.<\/p>\r\n\r\n\r\n\r\n<ol class=\"wp-block-list\">\r\n<li><strong>Entdeckung:<\/strong> Der Client sendet eine Broadcast-Anfrage, um einen DHCP-Server zu finden.<\/li>\r\n<li><strong>Angebot:<\/strong> Nachdem der DHCP-Server die Discover-Nachricht erhalten hat, schl\u00e4gt er dem Client die IP-Adressierung per Unicast vor.<\/li>\r\n<li><strong>Anfrage:<\/strong> Nachdem der Client das Angebot erhalten hat, sendet er nun offiziell eine Anforderungsnachricht an den Server, diesmal per Unicast.<\/li>\r\n<li><strong>Danksagung:<\/strong> Der Server sendet eine ACKNOWLEDGE-Nachricht zur Best\u00e4tigung des DHCP-Lease an den Client. Jetzt kann der Client die neuen IP-Einstellungen verwenden.<\/li>\r\n<\/ol>\r\n\r\n\r\n\r\n<div class=\"wp-block-image\">\r\n<figure class=\"aligncenter\"><img decoding=\"async\" class=\"wp-image-1667\" src=\"https:\/\/airoserver.com\/wp-content\/uploads\/2019\/10\/images_text_DHCP2.jpg\" alt=\"Wie funktioniert DHCP?\" \/><\/figure>\r\n<\/div>\r\n\r\n\r\n\r\n<h4 class=\"wp-block-heading\"><strong>Das Sicherheitsrisiko bei der Verwendung von DHCP<\/strong><\/h4>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Die Verwendung eines DHCP-Servers ist nicht nur gut, sie hat auch ihre Nachteile.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Das DHCP-Protokoll erfordert keine Authentifizierung, so dass jeder Client schnell einem Netz beitreten kann. Aus diesem Grund birgt es eine Reihe von Sicherheitsrisiken, z. B. dass nicht autorisierte Server falsche Informationen an Clients weitergeben, dass nicht autorisierte Clients IP-Adressen erhalten usw.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Da der Client keine M\u00f6glichkeit hat, die Authentizit\u00e4t eines DHCP-Servers zu \u00fcberpr\u00fcfen, kann er Denial-of-Service-Angriffe durchf\u00fchren oder <a href=\"https:\/\/en.wikipedia.org\/wiki\/Man-in-the-middle_attack\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"man-in-the-middle (\u00f6ffnet in einer neuen Registerkarte)\">Man-in-the-Middle<\/a> Angriffe, bei denen ein gef\u00e4lschter Server Daten abf\u00e4ngt, die f\u00fcr b\u00f6swillige Zwecke verwendet werden k\u00f6nnen. Da der DHCP-Server keine M\u00f6glichkeit hat, einen Client zu authentifizieren, gibt er umgekehrt IP-Adressinformationen an jedes Ger\u00e4t weiter, das eine Anfrage stellt.  Ein Bedrohungsakteur k\u00f6nnte einen Client so konfigurieren, dass er seine Anmeldeinformationen st\u00e4ndig \u00e4ndert und schnell alle verf\u00fcgbaren IP-Adressen im Bereich aussch\u00f6pft, so dass die Endger\u00e4te des Unternehmens nicht mehr auf das Netzwerk zugreifen k\u00f6nnen.<\/p>\r\n\r\n\r\n\r\n<p class=\"wp-block-paragraph\">Wir hoffen, dass Ihnen dieser Beitrag gefallen hat. Wenn ja, k\u00f6nnen Sie unsere <a href=\"https:\/\/airoserver.com\/de\/blog\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Blog (\u00f6ffnet in einer neuen Registerkarte)\">Blog<\/a> f\u00fcr mehr.<\/p>","protected":false},"excerpt":{"rendered":"<p>In our earlier posts, we have discussed IP completely. We said that every device that wants to join a network, gets an IP. But how do these devices know which IP they should get? This is when DHCP can help us. IP Assignment There are two ways of assigning IPs to devices: Statically: you have [&hellip;]<\/p>","protected":false},"author":5,"featured_media":33961,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[179,176,182,178],"tags":[85,184],"class_list":["post-1664","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-airoserver","category-dedicated","category-shared-hosting","category-airo-vps","tag-airoserver","tag-network"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What is DHCP Server?<\/title>\n<meta name=\"description\" content=\"The DHCP server assigns IP addresses automatically. So, instead of going over every device and assign an IP to them one by one, DHCP does it for us.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/airoserver.com\/de\/engagiert\/was-ist-ein-dhcp-server\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is DHCP Server?\" \/>\n<meta property=\"og:description\" content=\"The DHCP server assigns IP addresses automatically. 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