{"id":905,"date":"2021-12-19T01:09:18","date_gmt":"2021-12-18T17:09:18","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=905"},"modified":"2021-12-19T01:09:23","modified_gmt":"2021-12-18T17:09:23","slug":"linux%e9%ab%98%e6%80%a7%e8%83%bd%e6%9c%8d%e5%8a%a1%e5%99%a8%e8%af%bb%e4%b9%a6%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=905","title":{"rendered":"Linux\u9ad8\u6027\u80fd\u670d\u52a1\u5668\u8bfb\u4e66\u7b14\u8bb0"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u7b2c\u4e00\u7ae0 TCP\/IP\u534f\u8bae\u8be6\u89e3<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"114\">1.1.4<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">OSPF(Open Shortest Path First,\u5f00\u653e\u6700\u77ed\u8def\u5f84\u4f18\u5148)\u534f\u8bae\uff0c\u662f\u4e00\u79cd\u52a8\u6001\u8def\u7531\u66f4\u65b0\u534f\u8bae\uff0c\u7528\u4e8e\u8def\u7531\u5668\u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u4ee5\u544a\u77e5\u5bf9\u65b9\u8def\u7531\u5404\u81ea\u7684\u8def\u7531\u4fe1\u606f\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"dns%E5%8D%8F%E8%AE%AE\">DNS\u534f\u8bae<\/h1>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/tools.ietf.org\/html\/rfc1035\">RFC1035<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/jameshfisher.com\/2016\/12\/31\/dns-protocol\/\">\u4e00\u7bc7\u8001\u5916\u7684\u535a\u5ba2<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">DNS\u62a5\u6587\u5934\u90e8\u4fe1\u606f\u7684\u683c\u5f0f\uff1a\n                                    1  1  1  1  1  1\n      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                      ID                       |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |QR|   Opcode  |AA|TC|RD|RA|   Z    |   RCODE   |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                    QDCOUNT                    |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                    ANCOUNT                    |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                    NSCOUNT                    |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                    ARCOUNT                    |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n\n\nID:\u4e00\u5bf9\u67e5\u8be2\u7684\u6807\u8bc6\uff1b\nQR:\u67e5\u8be2\/\u5e94\u7b54\u6807\u5fd7\uff0c0\u8868\u793a\u8fd9\u662f\u4e00\u4e2a\u67e5\u8be2\u62a5\u6587\uff0c1\u8868\u793a\u8fd9\u662f\u4e00\u4e2a\u5e94\u7b54\u62a5\u6587\uff1b\nopcode:\u5b9a\u4e49\u67e5\u8be2\u548c\u5e94\u7b54\u7684\u7c7b\u578b\u30020\u8868\u793a\u6807\u51c6\u67e5\u8be2\uff0c1\u8868\u793a\u53cd\u5411\u67e5\u8be2(\u7531IP\u5730\u5740\u83b7\u53d6\u4e3b\u673a\u57df\u540d)\uff0c2\u8868\u793a\u8bf7\u6c42\u670d\u52a1\u5668\u72b6\u6001\uff1b\nAA:\u6388\u6743\u5e94\u7b54\u6807\u5fd7\uff0c\u4ec5\u7531\u5e94\u7b54\u62a5\u6587\u4f7f\u7528\u30021\u8868\u793a\u57df\u540d\u670d\u52a1\u5668\u662f\u6388\u6743\u670d\u52a1\u5668\uff1b\nTC:\u622a\u65ad\u6807\u5fd7\uff0c\u4ec5\u5f53DNS\u62a5\u6587\u4f7f\u7528UDP\u62a5\u6587\u670d\u52a1\u65f6\u4f7f\u7528\u30021\u8868\u793aDNS\u62a5\u6587\u8d85\u8fc7512\u5b57\u8282\uff0c\u5e76\u88ab\u622a\u65ad\uff1b\nRD:\u9012\u5f52\u67e5\u8be2\u6807\u5fd7\uff0c1\u8868\u793a\u6267\u884c\u9012\u5f52\u67e5\u8be2\uff0c\u5373\u5982\u679c\u5f53\u524dDNS\u670d\u52a1\u5668\u4e0d\u80fd\u89e3\u6790\u67d0\u4e2a\u57df\u540d\uff0c\u90a3\u4e48\u5b83\u5e94\u8be5\u5411\u5176\u4ed6\u57df\u540d\u670d\u52a1\u5668\u6267\u884c\u9012\u5f52\u67e5\u8be2\uff0c\u76f4\u5230\u67e5\u8be2\u5230\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\uff1b\n0\u8868\u793a\u8fd9\u662f\u8fed\u4ee3\u67e5\u8be2\uff0c\u5373\u5982\u679c\u5f53\u524dDNS\u670d\u52a1\u5668\u4e0d\u80fd\u89e3\u6790\u67d0\u4e2a\u57df\u540d\uff0c\u90a3\u4e48\u5b83\u5c31\u5c06\u81ea\u5df1\u77e5\u9053\u7684\u5176\u4ed6DNS\u670d\u52a1\u5668\u7684IP\u5730\u5740\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u53ef\u4ee5\u81ea\u5df1\u8003\u8651\u5411\u8fd9\u4e9b\u5176\u4ed6DNS\u670d\u52a1\u5668\u53d1\u9001\u67e5\u8be2\u8bf7\u6c42\uff1b\nRA:\u5141\u8bb8\u9012\u5f52\u6807\u5fd7\uff1b\u4ec5\u7531\u5e94\u7b54\u62a5\u6587\u4f7f\u7528\uff0c1\u8868\u793aDNS\u670d\u52a1\u5668\u652f\u6301\u9012\u5f52\u67e5\u8be2\uff1b\nzero:\u672a\u4f7f\u7528\u76843\u4f4d\uff0c\u5fc5\u987b\u90fd\u8bbe\u7f6e\u4e3a0\uff1b\nrcode\uff1a4\u4f4d\u8fd4\u56de\u7801\uff0c\u8868\u793a\u5e94\u7b54\u7684\u72b6\u6001\uff1b0\u8868\u793a\u65e0\u9519\u8bef\uff0c3\u8868\u793a\u57df\u540d\u4e0d\u5b58\u5728\uff1b\nQDCOUNT\u8868\u793aDNS\u62a5\u6587\u540e\u9762\u8ddf\u7684\u67e5\u8be2\u95ee\u9898\u7684\u4e2a\u6570\uff0cANCOUNT\u8868\u793a\u5e94\u7b54\u8d44\u6e90\u8bb0\u5f55\u6570\uff0cNSCOUNT\u8868\u793a\u6388\u6743\u8d44\u6e90\u8bb0\u5f55\u6570\uff0cARCOUNT\u8868\u793a\u989d\u5916\u8d44\u6e90\u8bb0\u5f55\u6570\uff1b\n\n\n\u67e5\u8be2\u95ee\u9898\u7684\u683c\u5f0f(Question section format)\uff1a\n\n                                    1  1  1  1  1  1\n      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                                               |\n    \/                     QNAME                     \/\n    \/                                               \/\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                     QTYPE                     |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                     QCLASS                    |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n\nQNAME\u5c01\u88c5\u4e86\u8981\u67e5\u8be2\u7684\u57df\u540d\uff0cwww.google.com\u5c31\u88ab\u8868\u793a\u4e3a{3,'w','w','w',6,'g','o','o','g','l','e',3,'c','o','m',0}\u8fd9\u6837\u7684\u5b57\u7b26\u6570\u7ec4\uff0c\u89c4\u5f8b\u5f88\u660e\u663e\uff0c\u5c31\u662f\u6bcf\u4e00\u7ea7\u57df\u540d\u524d\u9762\u586b\u4e00\u4e2a\u6570\u5b57\uff0c\u8868\u793a\u8be5\u7ea7\u57df\u540d\u5bf9\u5e94\u7684\u90e8\u5206\u7684\u5b57\u7b26\u4e2a\u6570\uff0c\u6700\u540e\u75280\u7ed3\u5c3e\u3002\u8fd9\u4e2aQNAME\u53ef\u80fd\u5360\u5947\u6570\u4e2a\u5b57\u8282\uff0c\u4e5f\u53ef\u80fd\u5360\u5076\u6570\u4e2a\u5b57\u8282\u3002\nQTYPE:16\u4f4d\uff0c\u8868\u793a\u67e5\u8be2\u7c7b\u578b\uff0c1\u8868\u793a\u7c7b\u578bA\uff0c\u83b7\u53d6\u76ee\u6807\u4e3b\u673a\u7684IP\u5730\u5740\uff0c5\u8868\u793a\u7c7b\u578bCNAME\uff0c\u83b7\u53d6\u76ee\u6807\u4e3b\u673a\u7684\u522b\u540d\uff1b12\u8868\u793a\u7c7b\u578bPTR\uff0c\u53cd\u5411\u67e5\u8be2\uff1b\nQCLASS:\u901a\u5e38\u4e3a1,\u8868\u793a\u83b7\u53d6IP\u5730\u5740\uff1b\n\n\u5e94\u7b54\u8d44\u6e90\u8bb0\u5f55\u3001\u6388\u6743\u8d44\u6e90\u8bb0\u5f55\u3001\u989d\u5916\u8d44\u6e90\u8bb0\u5f55\u90fd\u4f7f\u7528\u540c\u4e00\u79cd\u683c\u5f0f\uff0c\u5373\u8d44\u6e90\u8bb0\u5f55(Resource Record, RR)\u683c\u5f0f\u3002\n\n\n      0  1  2  3  4  5  6  7  8  9  0  1  2  3  4  5\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                                               |\n    \/                                               \/\n    \/                      NAME                     \/\n    |                                               |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                      TYPE                     |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                     CLASS                     |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                      TTL                      |\n    |                                               |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n    |                   RDLENGTH                    |\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|\n    \/                     RDATA                     \/\n    \/                                               \/\n    +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+\n\nNAME:\u8be5\u8d44\u6e90\u8bb0\u5f55\u5bf9\u5e94\u7684\u57df\u540d\uff0c\u4e0equestion section format\u4e2dQNAME\u542b\u4e49\u76f8\u540c\uff1b\nTYPE:16\u4f4d\uff0c\u7c7b\u578b\uff0c\u4e0equestion section format\u4e2d\u7c7b\u578b\u542b\u4e49\u76f8\u540c\uff1b\nCLASS:16\u7c7b\uff0c\u7c7b\uff0c\u4e0equestion section format\u4e2d\u7c7b\u542b\u4e49\u76f8\u540c\uff1b\nTTL:32\u4f4d\uff0c\u751f\u5b58\u65f6\u95f4\uff0c\u8868\u793a\u8be5\u67e5\u8be2\u8bb0\u5f55\u7ed3\u679c\u53ef\u88ab\u672c\u5730\u5ba2\u6237\u7aef\u7a0b\u5e8f\u7f13\u5b58\u591a\u957f\u65f6\u95f4\uff1b\nRDLENGTH:16\u4f4d\uff0c\u8d44\u6e90\u6570\u636e\u957f\u5ea6\uff0c\u8868\u793a\u540e\u9762\u7684RDDATA\u6709\u591a\u5c11\u4e2a\u5b57\u8282\uff1b\nRDDATA:\u8d44\u6e90\u6570\u636e\uff1b\n<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"%E7%AC%AC14%E7%AB%A0-%E5%A4%9A%E7%BA%BF%E7%A8%8B%E7%BC%96%E7%A8%8B\">\u7b2c14\u7ae0 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