{"id":670,"date":"2015-04-16T03:03:41","date_gmt":"2015-04-16T03:03:41","guid":{"rendered":"http:\/\/www.selinuxplus.com\/?p=670"},"modified":"2015-04-16T03:03:41","modified_gmt":"2015-04-16T03:03:41","slug":"%e6%a3%80%e6%b5%8b%e7%bd%91%e7%bb%9c%e4%b8%ad%e7%9a%84dhcp-server","status":"publish","type":"post","link":"http:\/\/www.selinuxplus.com\/?p=670","title":{"rendered":"\u68c0\u6d4b\u7f51\u7edc\u4e2d\u7684DHCP Server"},"content":{"rendered":"<p>DHCP \u662f Dynamic Host Configuration Protocol(\u52a8\u6001\u4e3b\u673a\u5206\u914d\u534f\u8bae)\u7f29\u5199\uff0c\u5b83\u7684\u524d\u8eab\u662f BOOTP\u3002DHCP \u53ef\u4ee5\u8bf4\u662f BOOTP \u7684\u589e\u5f3a\u7248\u672c\uff0c\u5b83\u5206\u4e3a\u4e24\u4e2a\u90e8\u4efd\uff1a\u4e00\u4e2a\u662f\u670d\u52a1\u5668\u7aef\uff0c\u800c\u53e6\u4e00\u4e2a\u662f\u5ba2\u6237\u7aef\u3002\u6240\u6709\u7684 IP \u7f51\u7edc\u8bbe\u5b9a\u6570\u636e\u90fd\u7531 DHCP \u670d\u52a1\u5668\u96c6\u4e2d\u7ba1\u7406\uff0c\u5e76\u8d1f\u8d23\u5904\u7406\u5ba2\u6237\u7aef\u7684 DHCP \u8981\u6c42\uff1b\u800c\u5ba2\u6237\u7aef\u5219\u4f1a\u4f7f\u7528\u4ece\u670d\u52a1\u5668\u5206\u914d\u4e0b\u6765\u7684IP\u73af\u5883\u6570\u636e\u3002<br \/>\n\u90a3\u4e48\u5728\u7f51\u7edc\u6d4b\u8bd5\u73af\u5883\u4e2d\uff0c\u53ef\u80fd\u5b58\u5728\u7740\u4e00\u4e9b\u79c1\u7528\u7684DHCPServer\uff0c\u8fd9\u6837\u4f1a\u5f71\u54cd\u5230\u5176\u4ed6\u73af\u5883\u7684\u8fd0\u884c\uff0c\u5c24\u5176\u662f\u5728\u540c\u4e00\u4e2a\u5c40\u57df\u7f51\u5185\uff0c\u90a3\u4e48\u4fa6\u6d4b\u5c40\u57df\u7f51\u5185\u7684dhcp server\u7684\u5b58\u5728\uff0c\u907f\u514d\u7b2c\u4e09\u65b9\u7684dhcp\u5bf9\u5b9e\u9a8c\u7684\u5f71\u54cd\uff0c\u6211\u4eec\u53ef\u4ee5\u6a21\u62df\u53d1\u73b0\u5f53\u524d\u7684dhcp server\u7684\u8fd0\u884c\u3002<br \/>\n\u4e00\u822c\u5f53\u5f00\u542fDHCP\u7684\u65f6\u5019\uff0c\u4f1a\u4f7f\u7528mac\u5730\u5740\u7684\u8fc7\u6ee4\uff0c\u4ee5\u9632\u6b62\u5bf9\u5176\u4ed6\u7269\u7406\u73af\u5883\u7684\u5f71\u54cd\u3002\u5728dhcpd.conf\u6587\u4ef6\u4e2d\u6dfb\u52a0\uff1a deny unknown-clients;\u9009\u9879\u3002<\/p>\n<p>\u5982\u679c\u73af\u5883\u4e2d\u5f00\u542f\u4e86\u4e00\u4e9bdhcp\u7684server\uff0c\u600e\u4e48\u624d\u80fd\u68c0\u6d4b\u51fa\u73af\u5883\u4e2d\u7684dhcp\u7684\u5b58\u5728\u5462\u3002\u6211\u4eec\u8981\u4e86\u89e3\u4e00\u4e9bDHCP\u7684\u77e5\u8bc6\u3002<br \/>\nDHCP\u7b80\u5355\u7684\u6765\u8bf4\u662fBOOTP +  Dynamic allocation of IP addresses\u3002DHCP\u53c8\u6bd4BOOTP\u591a\u4e86\u4e00\u79cd\u79df\u7ea6\u7684\u6982\u5ff5\uff0c\u6709\u6548\u4e14\u52a8\u6001\u7684\u5206\u914d\u5ba2\u6237\u7aef\u7684 TCP\/IP \u8bbe\u5b9a\u3002\u90a3\u4e48\u6211\u4eec\u5148\u4e86\u89e3\u4e00\u4e0bBOOTP\u7684\u534f\u8bae\u3002<\/p>\n<p><a href=\"http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/bootp-message.png\"><img loading=\"lazy\" src=\"http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/bootp-message.png\" alt=\"bootp message\" width=\"866\" height=\"621\" class=\"aligncenter size-full wp-image-671\" srcset=\"http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/bootp-message.png 866w, http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/bootp-message-300x215.png 300w\" sizes=\"(max-width: 866px) 100vw, 866px\" \/><\/a><\/p>\n<p>dhcp client\u8bf7\u6c42\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p><a href=\"http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/dhcp-req.png\"><img loading=\"lazy\" src=\"http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/dhcp-req.png\" alt=\"dhcp req\" width=\"850\" height=\"274\" class=\"aligncenter size-full wp-image-672\" srcset=\"http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/dhcp-req.png 850w, http:\/\/www.selinuxplus.com\/wp-content\/uploads\/2015\/04\/dhcp-req-300x96.png 300w\" sizes=\"(max-width: 850px) 100vw, 850px\" \/><\/a><\/p>\n<p>\u6211\u4eec\u770b\u4e00\u4e0bDHCP\u7684 discovery \u548c offer\u7684\u6d88\u606f\u683c\u5f0f\uff0c\u6211\u4eec\u53ef\u4ee5\u7ec4\u88c5\u6211\u4eec\u7684\u6570\u636e\u5305\u3002<br \/>\nhttp:\/\/en.wikipedia.org\/wiki\/Dynamic_Host_Configuration_Protocol<\/p>\n<p>\u7ec4\u88c5\u6570\u636e\u5305\u5982\u4e0b\uff1a<\/p>\n<pre class=\"lang:default decode:true \" >packet += b'\\x01'   #Message type: Boot Request (1)\r\npacket += b'\\x01'   #Hardware type: Ethernet\r\npacket += b'\\x06'   #Hardware address length: 6\r\npacket += b'\\x00'   #Hops: 0 \r\npacket += transactionID       #Transaction ID\r\npacket += b'\\x00\\x00'    #Seconds elapsed: 0\r\npacket += b'\\x80\\x00'   #Bootp flags: 0x8000 (Broadcast) + reserved flags\r\npacket += b'\\x00\\x00\\x00\\x00'   #Client IP address: 0.0.0.0\r\npacket += b'\\x00\\x00\\x00\\x00'   #Your (client) IP address: 0.0.0.0\r\npacket += b'\\x00\\x00\\x00\\x00'   #Next server IP address: 0.0.0.0\r\npacket += b'\\x00\\x00\\x00\\x00'   #Relay agent IP address: 0.0.0.0\r\npacket += b'\\x00\\x26\\x9e\\x04\\x1e\\x9b'   #Client MAC address: 00:26:9e:04:1e:9b\uff0cor local MacAddress\r\n\r\npacket += b'\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00\\x00'   #Client hardware address padding: 00000000000000000000\r\npacket += b'\\x00' * 67  #Server host name not given\r\npacket += b'\\x00' * 125 #Boot file name not given\r\npacket += b'\\x63\\x82\\x53\\x63'   #Magic cookie: DHCP\r\npacket += b'\\x35\\x01\\x01'   #Option: (t=53,l=1) DHCP Message Type = DHCP Discover\r\n#packet += b'\\x3d\\x06\\x00\\x26\\x9e\\x04\\x1e\\x9b'   #Option: (t=61,l=6) Client identifier\r\npacket += b'\\x3d\\x06' + macaddress\r\npacket += b'\\x37\\x03\\x03\\x01\\x06'   #Option: (t=55,l=3) Parameter Request List\r\npacket += b'\\xff'   #End Option<\/pre>\n<p>\u4f7f\u7528socket \u5c06\u5c01\u88c5\u540e\u7684\u6570\u636e\u5305\u53d1\u9001\u51fa\u53bb\u3002\u7136\u540erecv\u6570\u636e\u5305\u8fdb\u884c\u6570\u636e\u5305\u7684\u5206\u6790\u3002<br \/>\n\u6211\u4eec\u53ef\u4ee5\u5206\u6790\u540e\u7684\u6570\u636e\u770b\u5230\uff1a<br \/>\nDHCP Server          : 192.168.8.xxx<br \/>\nOffered IP address   : 192.168.8.1xx<br \/>\nNext Server          : 192.168.9.1xx<br \/>\nsubnet mask          : 192.168.8.1<\/p>\n","protected":false},"excerpt":{"rendered":"<p>DHCP \u662f Dynamic Host Confi&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts\/670"}],"collection":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=670"}],"version-history":[{"count":1,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts\/670\/revisions"}],"predecessor-version":[{"id":673,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=\/wp\/v2\/posts\/670\/revisions\/673"}],"wp:attachment":[{"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=670"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=670"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.selinuxplus.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=670"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}