{"id":70,"date":"2017-01-28T09:49:41","date_gmt":"2017-01-28T01:49:41","guid":{"rendered":"http:\/\/www.thinkmesh.net\/?p=70"},"modified":"2017-02-06T21:59:45","modified_gmt":"2017-02-06T13:59:45","slug":"tcp%e7%8a%b6%e6%80%81%e6%9c%ba%e5%8f%8a%e5%85%b6%e5%af%b9cs%e7%a8%8b%e5%ba%8f%e5%bd%b1%e5%93%8d","status":"publish","type":"post","link":"http:\/\/www.thinkmesh.net\/?p=70","title":{"rendered":"TCP\u72b6\u6001\u673a\u53ca\u5176\u5bf9CS\u7a0b\u5e8f\u5f71\u54cd"},"content":{"rendered":"<p>\u6700\u8fd1\u5728\u770b\u8fd9\u65b9\u9762\u7684\u5185\u5bb9\uff0c\u4ee5\u4e0b\u6574\u7406\u81ea\u7f51\u7edc\u3002<\/p>\n<h2>TCP\u8fde\u63a5\u7684\u72b6\u6001<\/h2>\n<p style=\"text-align: justify;\">\u9996\u5148\u4ecb\u7ecd\u4e00\u4e0bTCP\u8fde\u63a5\u5efa\u7acb\u4e0e\u5173\u95ed\u8fc7\u7a0b\u4e2d\u7684\u72b6\u6001\u3002TCP\u8fde\u63a5\u8fc7\u7a0b\u662f\u72b6\u6001\u7684\u8f6c\u6362\uff0c\u4fc3\u4f7f\u72b6\u6001\u53d1\u751f\u8f6c\u6362\u7684\u56e0\u7d20\u5305\u62ec\u7528\u6237\u8c03\u7528\u3001\u7279\u5b9a\u6570\u636e\u5305\u4ee5\u53ca\u8d85\u65f6\u7b49\uff0c\u5177\u4f53\u72b6\u6001\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<p style=\"text-align: justify;\">\n<ul>\n<li><strong>CLOSED<\/strong>\uff1a\u521d\u59cb\u72b6\u6001\uff0c\u8868\u793a\u6ca1\u6709\u4efb\u4f55\u8fde\u63a5\u3002<\/li>\n<li><strong>LISTEN<\/strong>\uff1aServer\u7aef\u7684\u67d0\u4e2aSocket\u6b63\u5728\u76d1\u542c\u6765\u81ea\u8fdc\u65b9\u7684TCP\u7aef\u53e3\u7684\u8fde\u63a5\u8bf7\u6c42\u3002<\/li>\n<li><strong>SYN_SENT<\/strong>\uff1a\u53d1\u9001\u8fde\u63a5\u8bf7\u6c42\u540e\u7b49\u5f85\u786e\u8ba4\u4fe1\u606f\u3002\u5f53\u5ba2\u6237\u7aefSocket\u8fdb\u884cConnect\u8fde\u63a5\u65f6\uff0c\u4f1a\u9996\u5148\u53d1\u9001SYN\u5305\uff0c\u968f\u5373\u8fdb\u5165SYN_SENT\u72b6\u6001\uff0c\u7136\u540e\u7b49\u5f85Server\u7aef\u53d1\u9001\u4e09\u6b21\u63e1\u624b\u4e2d\u7684\u7b2c2\u4e2a\u5305\u3002<\/li>\n<li><strong>SYN_RECEIVED<\/strong>\uff1a\u6536\u5230\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\u540e\u56de\u9001\u786e\u8ba4\u4fe1\u606f\u548c\u5bf9\u7b49\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u7136\u540e\u7b49\u5f85\u786e\u8ba4\u4fe1\u606f\u3002\u901a\u5e38\u662f\u5efa\u7acbTCP\u8fde\u63a5\u7684\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b\u4e2d\u7684\u4e00\u4e2a\u4e2d\u95f4\u72b6\u6001\uff0c\u8868\u793aServer\u7aef\u7684Socket\u63a5\u6536\u5230\u6765\u81eaClient\u7684SYN\u5305\uff0c\u5e76\u4f5c\u51fa\u56de\u5e94\u3002<\/li>\n<li><strong>ESTABLISHED<\/strong>\uff1a\u8868\u793a\u8fde\u63a5\u5df2\u7ecf\u5efa\u7acb\uff0c\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u3002<\/li>\n<li><strong>FIN_WAIT_1<\/strong>\uff1a\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u7b49\u5f85\u5bf9\u65b9\u8fd4\u56deACK\u5305\u3002\u82e5Socket\u5728ESTABLISHED\u72b6\u6001\u4e0b\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u5e76\u5411\u5bf9\u65b9\u53d1\u9001FIN\u5305\uff08\u8868\u793a\u5df1\u65b9\u4e0d\u518d\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\uff09\uff0c\u5219\u8fdb\u5165FIN_WAIT_1\u72b6\u6001\uff0c\u7b49\u5f85\u5bf9\u65b9\u8fd4\u56deACK\u5305\uff0c\u6b64\u540e\u8fd8\u80fd\u8bfb\u53d6\u6570\u636e\uff0c\u4f46\u4e0d\u80fd\u53d1\u9001\u6570\u636e\u3002\u5728\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u65e0\u8bba\u5bf9\u65b9\u5904\u4e8e\u4f55\u79cd\u72b6\u6001\uff0c\u90fd\u5e94\u8be5\u9a6c\u4e0a\u8fd4\u56deACK\u5305\uff0c\u6240\u4ee5FIN_WAIT_1\u72b6\u6001\u4e00\u822c\u5f88\u96be\u89c1\u5230\u3002<\/li>\n<li><strong>FIN_WAIT_2<\/strong>\uff1a\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u6536\u5230\u5bf9\u65b9\u8fd4\u56de\u7684ACK\u5305\u540e\uff0c\u7b49\u5f85\u5bf9\u65b9\u53d1\u9001FIN\u5305\u3002\u5904\u4e8eFIN_WAIT_1\u72b6\u6001\u4e0b\u7684Socket\u6536\u5230\u4e86\u5bf9\u65b9\u8fd4\u56de\u7684ACK\u5305\u540e\uff0c\u4fbf\u8fdb\u5165FIN_WAIT_2\u72b6\u6001\u3002\u7531\u4e8eFIN_WAIT_2\u72b6\u6001\u4e0b\u7684Socket\u9700\u8981\u7b49\u5f85\u5bf9\u65b9\u53d1\u9001\u7684FIN\u5305\uff0c\u6240\u6709\u5e38\u5e38\u53ef\u4ee5\u770b\u5230\u3002\u82e5\u5728FIN_WAIT_1\u72b6\u6001\u4e0b\u6536\u5230\u5bf9\u65b9\u53d1\u9001\u7684\u540c\u65f6\u5e26\u6709FIN\u548cACK\u7684\u5305\u65f6\uff0c\u5219\u76f4\u63a5\u8fdb\u5165TIME_WAIT\u72b6\u6001\uff0c\u65e0\u987b\u7ecf\u8fc7FIN_WAIT_2\u72b6\u6001\u3002<\/li>\n<li><strong>TIME_WAIT<\/strong>\uff1a\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u6536\u5230\u5bf9\u65b9\u53d1\u9001\u7684FIN\u5305\u540e\u8fd4\u56deACK\u5305\uff08\u8868\u793a\u5bf9\u65b9\u4e5f\u4e0d\u518d\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\uff0c\u6b64\u540e\u4e0d\u80fd\u518d\u8bfb\u53d6\u6216\u53d1\u9001\u6570\u636e\uff09\uff0c\u7136\u540e\u7b49\u5f85\u8db3\u591f\u957f\u7684\u65f6\u95f4\uff082MSL\uff09\u4ee5\u786e\u4fdd\u5bf9\u65b9\u63a5\u6536\u5230ACK\u5305\uff08\u8003\u8651\u5230\u4e22\u5931ACK\u5305\u7684\u53ef\u80fd\u548c\u8ff7\u8def\u91cd\u590d\u6570\u636e\u5305\u7684\u5f71\u54cd\uff09\uff0c\u6700\u540e\u56de\u5230CLOSED\u72b6\u6001\uff0c\u91ca\u653e\u7f51\u7edc\u8d44\u6e90\u3002<\/li>\n<li><strong>CLOSE_WAIT<\/strong>\uff1a\u8868\u793a\u88ab\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u5728\u7b49\u5f85\u5173\u95ed\u8fde\u63a5\u3002\u5f53\u6536\u5230\u5bf9\u65b9\u53d1\u9001\u7684FIN\u5305\u540e\uff08\u8868\u793a\u5bf9\u65b9\u4e0d\u518d\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\uff09\uff0c\u76f8\u5e94\u7684\u8fd4\u56deACK\u5305\uff0c\u7136\u540e\u8fdb\u5165CLOSE_WAIT\u72b6\u6001\u3002\u5728\u8be5\u72b6\u6001\u4e0b\uff0c\u82e5\u5df1\u65b9\u8fd8\u6709\u6570\u636e\u672a\u53d1\u9001\uff0c\u5219\u53ef\u4ee5\u7ee7\u7eed\u5411\u5bf9\u65b9\u8fdb\u884c\u53d1\u9001\uff0c\u4f46\u4e0d\u80fd\u518d\u8bfb\u53d6\u6570\u636e\uff0c\u76f4\u5230\u6570\u636e\u53d1\u9001\u5b8c\u6bd5\u3002<\/li>\n<li><strong>LAST_ACK<\/strong>\uff1a\u88ab\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u5728CLOSE_WAIT\u72b6\u6001\u4e0b\u5b8c\u6210\u6570\u636e\u7684\u53d1\u9001\u540e\u4fbf\u53ef\u5411\u5bf9\u65b9\u53d1\u9001FIN\u5305(\u8868\u793a\u5df1\u65b9\u4e0d\u518d\u6709\u6570\u636e\u9700\u8981\u53d1\u9001)\uff0c\u7136\u540e\u7b49\u5f85\u5bf9\u65b9\u8fd4\u56deACK\u5305\u3002\u6536\u5230ACK\u5305\u540e\u4fbf\u56de\u5230CLOSED\u72b6\u6001\uff0c\u91ca\u653e\u7f51\u7edc\u8d44\u6e90\u3002<\/li>\n<li><strong>CLOSING<\/strong>\uff1a\u6bd4\u8f83\u7f55\u89c1\u7684\u4f8b\u5916\u72b6\u6001\u3002\u6b63\u5e38\u60c5\u51b5\u4e0b\uff0c\u53d1\u9001FIN\u5305\u540e\u5e94\u8be5\u5148\u6536\u5230\uff08\u6216\u540c\u65f6\u6536\u5230\uff09\u5bf9\u65b9\u7684ACK\u5305\uff0c\u518d\u6536\u5230\u5bf9\u65b9\u7684FIN\u5305\uff0c\u800cCLOSING\u72b6\u6001\u8868\u793a\u53d1\u9001FIN\u5305\u540e\u5e76\u6ca1\u6709\u6536\u5230\u5bf9\u65b9\u7684ACK\u5305\uff0c\u5374\u5df2\u6536\u5230\u4e86\u5bf9\u65b9\u7684FIN\u5305\u3002\u6709\u4e24\u79cd\u60c5\u51b5\u53ef\u80fd\u5bfc\u81f4\u8fd9\u79cd\u72b6\u6001\uff1a\u5176\u4e00\uff0c\u5982\u679c\u53cc\u65b9\u51e0\u4e4e\u5728\u540c\u65f6\u5173\u95ed\u8fde\u63a5\uff0c\u90a3\u4e48\u5c31\u53ef\u80fd\u51fa\u73b0\u53cc\u65b9\u540c\u65f6\u53d1\u9001FIN\u5305\u7684\u60c5\u51b5\uff1b\u5176\u4e8c\uff0c\u5982\u679cACK\u5305\u4e22\u5931\u800c\u5bf9\u65b9\u7684FIN\u5305\u5f88\u5feb\u53d1\u51fa\uff0c\u4e5f\u4f1a\u51fa\u73b0FIN\u5148\u4e8eACK\u5230\u8fbe\u3002<\/li>\n<\/ul>\n<h2>TCP\u8fde\u63a5\u72b6\u6001\u673a<\/h2>\n<p><a href=\"http:\/\/www.thinkmesh.net\/wp-content\/uploads\/2017\/01\/2017012801593470.png\" rel=\"box\" class=\"fancybox\"><img loading=\"lazy\" decoding=\"async\" width=\"1012\" height=\"1115\" src=\"http:\/\/www.thinkmesh.net\/wp-content\/uploads\/2017\/01\/2017012801593470.png\" alt=\"\" class=\"alignleft size-full wp-image-77\" \/><\/a><br \/>\n<a href=\"http:\/\/www.thinkmesh.net\/wp-content\/uploads\/2017\/01\/2017012801593655.png\" rel=\"box\" class=\"fancybox\"><img loading=\"lazy\" decoding=\"async\" width=\"1052\" height=\"880\" src=\"http:\/\/www.thinkmesh.net\/wp-content\/uploads\/2017\/01\/2017012801593655.png\" alt=\"\" class=\"alignleft size-full wp-image-78\" \/><\/a><\/p>\n<h2>TCP\u8fde\u63a5\u5173\u95ed<\/h2>\n<p style=\"text-align: justify;\">\u5efa\u7acbTCP\u8fde\u63a5\u9700\u8981\u4e09\u6b21\u63e1\u624b\uff0c\u800c\u5173\u95ed\u8fde\u63a5\u5219\u9700\u8981\u56db\u6b21\u63e1\u624b\uff0c\u5e76\u4e14\u5206\u4e3a\u4e3b\u52a8\u5173\u95ed\u548c\u88ab\u52a8\u5173\u95ed\u3002\u8fd9\u662f\u7531\u4e8eTCP\u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684\uff0c\u6211\u5173\u4e86\u4f60\u7684\u8fde\u63a5\uff0c\u5e76\u4e0d\u7b49\u4e8e\u4f60\u5173\u4e86\u6211\u7684\u8fde\u63a5\uff0c\u56e0\u6b64\u53cc\u65b9\u90fd\u5fc5\u987b\u5355\u72ec\u8fdb\u884c\u5173\u95ed\u3002\u5f53\u4e00\u65b9\u5b8c\u6210\u5b83\u7684\u6570\u636e\u53d1\u9001\u4efb\u52a1\u540e\u53ef\u4ee5\u53d1\u9001FIN\u5305\u6765\u7ec8\u6b62\u8fd9\u4e2a\u65b9\u5411\u7684\u8fde\u63a5\uff0c\u8868\u660e\u81ea\u5df1\u4e0d\u518d\u6709\u6570\u636e\u9700\u8981\u53d1\u9001\uff1b\u6536\u5230FIN\u5305\u7684\u90a3\u4e00\u65b9\u867d\u7136\u4e0d\u80fd\u518d\u8bfb\u53d6\u6570\u636e\uff0c\u4f46\u4ecd\u80fd\u53d1\u9001\u6570\u636e\u3002\u4ee5Client\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u4e3a\u4f8b\uff1a<\/p>\n<p style=\"text-align: justify;\">\n<ol>\n<li>Client\u5411Server\u53d1\u9001FIN\u5305\uff0c\u8868\u793aClient\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\uff0c\u7136\u540e\u8fdb\u5165FIN_WAIT_1\u72b6\u6001\uff0c\u7b49\u5f85Server\u8fd4\u56deACK\u5305\u3002\u6b64\u540eClient\u4e0d\u80fd\u518d\u5411Server\u53d1\u9001\u6570\u636e\uff0c\u4f46\u80fd\u8bfb\u53d6\u6570\u636e\u3002<\/li>\n<li>Server\u6536\u5230FIN\u5305\u540e\u5411Client\u53d1\u9001ACK\u5305\uff0c\u7136\u540e\u8fdb\u5165CLOSE_WAIT\u72b6\u6001\uff0c\u6b64\u540eServer\u4e0d\u80fd\u518d\u8bfb\u53d6\u6570\u636e\uff0c\u4f46\u53ef\u4ee5\u7ee7\u7eed\u5411Client\u53d1\u9001\u6570\u636e\u3002Client\u6536\u5230Server\u8fd4\u56de\u7684ACK\u5305\u540e\u8fdb\u5165FIN_WAIT_2\u72b6\u6001\uff0c\u7b49\u5f85Server\u53d1\u9001FIN\u5305\u3002<\/li>\n<li>Server\u5b8c\u6210\u6570\u636e\u7684\u53d1\u9001\u540e\uff0c\u5c06FIN\u5305\u53d1\u9001\u7ed9Client\uff0c\u7136\u540e\u8fdb\u5165LAST_ACK\u72b6\u6001\uff0c\u7b49\u5f85Client\u8fd4\u56deACK\u5305\uff0c\u6b64\u540eServer\u65e2\u4e0d\u80fd\u8bfb\u53d6\u6570\u636e\uff0c\u4e5f\u4e0d\u80fd\u53d1\u9001\u6570\u636e\u3002<\/li>\n<li>Client\u6536\u5230FIN\u5305\u540e\u5411Server\u53d1\u9001ACK\u5305\uff0c\u7136\u540e\u8fdb\u5165TIME_WAIT\u72b6\u6001\uff0c\u63a5\u7740\u7b49\u5f85\u8db3\u591f\u957f\u7684\u65f6\u95f4\uff082MSL\uff09\u4ee5\u786e\u4fddServer\u63a5\u6536\u5230ACK\u5305\uff0c\u6700\u540e\u56de\u5230CLOSED\u72b6\u6001\uff0c\u91ca\u653e\u7f51\u7edc\u8d44\u6e90\u3002Server\u6536\u5230Client\u8fd4\u56de\u7684ACK\u5305\u540e\u4fbf\u56de\u5230CLOSED\u72b6\u6001\uff0c\u91ca\u653e\u7f51\u7edc\u8d44\u6e90\u3002<\/li>\n<\/ol>\n<p>TCP\u8fde\u63a5\u7684\u5efa\u7acb\u5230\u5173\u95ed\uff0c\u9700\u8981\u7ecf\u5386\u4ee5\u4e0b\u72b6\u6001\u8fc1\u79fb\uff08\u5047\u5b9aClient\u53d1\u8d77\u8fde\u63a5\uff0c\u5e76\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\uff09\uff1a<br \/>\n<strong>Client<\/strong><br \/>\n\u3000\u3000CLOSED -> SYN_SENT -> ESTABLISHED -> FIN_WAIT_1 -> FIN_WAIT_2 -> TIME_WAIT -> CLOSED<br \/>\n<strong>Server<\/strong><br \/>\n\u3000\u3000CLODES -> LISTEN -> SYN_RECEIVED -> ESTABLISHED -> CLOSE_WAIT -> LAST_ACK -> CLOSED<\/p>\n<h2>\u5bf9CS\u7a0b\u5e8f\u5f71\u54cd<\/h2>\n<p style=\"text-align: justify;\">\u5728\u8be6\u7ec6\u4e86\u89e3TCP\u8fde\u63a5\u7684\u72b6\u6001\u548c\u5173\u95ed\u65b9\u5f0f\u540e\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0TIME_WAIT\u72b6\u6001\u662f\u4e00\u4e2a\u5751\u7239\u7684\u5b58\u5728\uff01\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u5728\u53d1\u9001\u6700\u540e\u4e00\u4e2aACK\u5305\u540e\uff0c\u65e0\u8bba\u5bf9\u65b9\u662f\u5426\u6536\u5230\u90fd\u4f1a\u8fdb\u5165TIME_WAIT\u72b6\u6001\uff0c\u7b49\u5f852MSL\u7684\u65f6\u95f4\uff0c\u7136\u540e\u624d\u80fd\u91ca\u653e\u7f51\u7edc\u8d44\u6e90\u3002MSL\u5c31\u662fMaximum Segment 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[&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"_links":{"self":[{"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=\/wp\/v2\/posts\/70"}],"collection":[{"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=70"}],"version-history":[{"count":19,"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=\/wp\/v2\/posts\/70\/revisions"}],"predecessor-version":[{"id":131,"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=\/wp\/v2\/posts\/70\/revisions\/131"}],"wp:attachment":[{"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=70"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=70"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.thinkmesh.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=70"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}