{"id":767,"date":"2014-01-28T17:01:58","date_gmt":"2014-01-28T09:01:58","guid":{"rendered":"http:\/\/coderbee.net\/?p=767"},"modified":"2014-01-28T17:21:15","modified_gmt":"2014-01-28T09:21:15","slug":"tcpip-%e5%8d%8f%e8%ae%ae%e8%af%a6%e8%a7%a3-%e7%ac%ac18%e7%ab%a0-tcp-%e8%bf%9e%e6%8e%a5%e7%9a%84%e5%bb%ba%e7%ab%8b%e4%b8%8e%e7%bb%88%e6%ad%a2","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/basis\/20140128\/767","title":{"rendered":"TCP\/IP \u534f\u8bae\u8be6\u89e3 \u7b2c18\u7ae0 TCP \u8fde\u63a5\u7684\u5efa\u7acb\u4e0e\u7ec8\u6b62"},"content":{"rendered":"<p>TCP\u662f\u4e00\u4e2a\u9762\u5411\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u65e0\u8bba\u54ea\u4e00\u65b9\u5411\u53e6\u4e00\u65b9\u53d1\u9001\u6570\u636e\u4e4b\u524d\uff0c\u90fd\u5fc5\u987b\u5148\u5728\u53cc\u65b9\u4e4b\u95f4\u5efa\u7acb\u4e00\u6761\u8fde\u63a5\u3002<\/p>\n<h2>\u8fde\u63a5\u5efa\u7acb\u4e0e\u7ec8\u6b62<\/h2>\n<h3>\u8fde\u63a5\u5efa\u7acb\u534f\u8bae<\/h3>\n<p>\u4e3a\u5efa\u7acb\u4e00\u6761TCP\u8fde\u63a5\u7684\u6b65\u9aa4\uff1a<\/p>\n<ul>\n<li>\u5ba2\u6237\u7aef\u53d1\u9001\u4e00\u4e2a SYN \u6bb5\uff08SYN \u6807\u5fd7\u7f6e 1\uff09\u6307\u660e\u5ba2\u6237\u7aef\u6253\u7b97\u8fde\u63a5\u7684\u670d\u52a1\u5668\u7684\u7aef\u53e3\uff0c\u4ee5\u53ca\u5176\u521d\u59cb\u5e8f\u53f7 ISN\u3002<\/li>\n<li>\u670d\u52a1\u5668\u53d1\u56de\u5305\u542b\u670d\u52a1\u5668\u7684\u521d\u59cb\u5e8f\u53f7\u7684 SYN-ACK \u62a5\u6587\u6bb5\uff08SYN\u3001ACK\u6807\u5fd7\u90fd\u7f6e 1\uff09\u4f5c\u4e3a\u5e94\u7b54\uff0c\u786e\u8ba4\u5e8f\u53f7\u8bbe\u7f6e\u4e3a\u5ba2\u6237\u7aef\u7684 ISN \u52a0 1 \u4ee5\u5bf9\u5ba2\u6237\u7aef\u7684 SYN \u62a5\u6587\u6bb5\u8fdb\u884c\u786e\u8ba4\uff08\u4e00\u4e2a SYN \u5360\u7528\u4e00\u4e2a\u5e8f\u53f7\uff09\u3002<\/li>\n<li>\u5ba2\u6237\u7aef\u5fc5\u987b\u5c06\u786e\u8ba4\u5e8f\u53f7\u8bbe\u7f6e\u4e3a\u670d\u52a1\u5668\u7684 ISN \u52a0 1 \u4ee5\u5bf9\u670d\u52a1\u5668\u7684 SYN-ACK \u62a5\u6587\u6bb5\u8fdb\u884c\u786e\u8ba4\u3002<\/li>\n<\/ul>\n<p>\u8fd9\u4e09\u4e2a\u62a5\u6587\u6bb5\u5b8c\u6210\u8fde\u63a5\u7684\u5efa\u7acb\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u79f0\u4e3a\u4e09\u6b21\u63e1\u624b\uff08three-way handshake\uff09\u3002<\/p>\n<p><!--more--><\/p>\n<h3>\u8fde\u63a5\u7ec8\u6b62\u534f\u8bae<\/h3>\n<p>\u7531\u4e8eTCP\u7684\u534a\u5173\u95ed\uff08half-close\uff09\uff0c\u7ec8\u6b62\u4e00\u4e2a\u8fde\u63a5\u8981\u7ecf\u8fc7 4 \u6b21\u63e1\u624b\u3002TCP\u7684\u8fde\u63a5\u662f\u5168\u53cc\u5de5\uff0c\u56e0\u6b64\u6bcf\u4e2a\u65b9\u5411\u5fc5\u987b\u5355\u72ec\u8fdb\u884c\u5173\u95ed\u3002\u5f53\u4e00\u65b9\u5b8c\u6210\u5b83\u7684\u6570\u636e\u53d1\u9001\u4efb\u52a1\u540e\u5c31\u80fd\u53d1\u9001\u4e00\u4e2a FIN \u6765\u7ec8\u6b62\u8fd9\u4e2a\u65b9\u5411\u8fde\u63a5\u3002\u5f53\u4e00\u7aef\u6536\u5230\u4e00\u4e2a FIN\uff0c\u5b83\u5fc5\u987b\u901a\u77e5\u5e94\u7528\u5c42\u53e6\u4e00\u7aef\u5df2\u7ecf\u7ec8\u6b62\u4e86\u90a3\u4e2a\u65b9\u5411\u7684\u6570\u636e\u4f20\u9001\u3002<\/p>\n<p>\u6536\u5230\u4e00\u4e2a FIN \u53ea\u610f\u5473\u7740\u5728\u8fd9\u4e00\u65b9\u5411\u4e0a\u6ca1\u6709\u6570\u636e\u6d41\u52a8\uff0c\u4e00\u4e2aTCP\u8fde\u63a5\u5728\u6536\u5230\u4e00\u4e2a FIN \u540e\u4ecd\u80fd\u53d1\u9001\u6570\u636e\u3002<br \/>\n<img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/01\/TCP-close.png\" alt=\"TCP\u5173\u95ed\u8fde\u63a5\" \/><\/p>\n<p>\u5f53\u670d\u52a1\u5668\u6536\u5230\u5ba2\u6237\u7aef\u7684 FIN\uff0c\u5b83\u53d1\u56de\u4e00\u4e2a ACK\uff0c\u786e\u8ba4\u5e8f\u53f7\u4e3a\u6536\u5230\u7684\u5e8f\u53f7\u52a0 1\uff0c\u548c SYN \u4e00\u6837\uff0c\u4e00\u4e2a FIN \u5c06\u5360\u7528\u4e00\u4e2a\u5e8f\u53f7\u3002<\/p>\n<p>\u9996\u5148\u8fdb\u884c\u5173\u95ed\u7684\u4e00\u65b9\u5c06\u6267\u884c\u4e3b\u52a8\u5173\u95ed\uff0c\u800c\u53e6\u4e00\u65b9\u6267\u884c\u88ab\u52a8\u5173\u95ed\u3002\u901a\u5e38\u4e00\u65b9\u5b8c\u6210\u4e3b\u52a8\u5173\u95ed\u800c\u53e6\u4e00\u65b9\u5b8c\u6210\u88ab\u52a8\u5173\u95ed\uff0c\u4e5f\u53ef\u4ee5\u53cc\u65b9\u6267\u884c\u4e3b\u52a8\u5173\u95ed\u3002<\/p>\n<h2>\u6700\u5927\u62a5\u6587\u6bb5\u957f\u5ea6<\/h2>\n<p>\u6700\u5927\u62a5\u6587\u6bb5\u957f\u5ea6\uff08MSS\uff09\u8868\u793aTCP\u4f20\u5f80\u53e6\u4e00\u7aef\u7684\u6700\u5927\u5757\u6570\u636e\u7684\u957f\u5ea6\u3002\u5f53\u4e00\u4e2a\u8fde\u63a5\u5efa\u7acb\u65f6\uff0c\u8fde\u63a5\u7684\u53cc\u65b9\u90fd\u8981\u901a\u544a\u5404\u81ea\u7684MSS\uff08MSS\u9009\u9879\u53ea\u80fd\u51fa\u73b0\u5728 SYN \u62a5\u6587\u6bb5\u4e2d\uff09\u3002\u5982\u679c\u4e00\u65b9\u4e0d\u63a5\u6536\u6765\u81ea\u53e6\u4e00\u65b9\u7684MSS\u503c\uff0c\u5219MSS\u5c31\u5b9a\u4e3a\u9ed8\u8ba4\u503c 536 \u5b57\u8282\uff08\u8fd9\u4e2a\u9ed8\u8ba4\u503c\u5141\u8bb8 20 \u5b57\u8282\u7684IP\u9996\u90e8\u548c 20 \u5b57\u8282\u7684TCP\u9996\u90e8\u4ee5\u9002\u5408 576 \u5b57\u8282\u7684IP\u6570\u636e\u62a5\uff09\u3002<\/p>\n<p>\u4e00\u822c\u6765\u8bf4\uff0c\u5982\u679c\u6ca1\u6709\u5206\u6bb5\u53d1\u751f\uff0cMSS\u8fd8\u662f\u8d8a\u5927\u8d8a\u597d\uff0c\u62a5\u6587\u6bb5\u8d8a\u5927\u5141\u8bb8\u6bcf\u4e2a\u62a5\u6587\u6bb5\u4f20\u9001\u7684\u6570\u636e\u5c31\u8d8a\u591a\uff0c\u76f8\u5bf9IP\u548cTCP\u9996\u90e8\u6709\u66f4\u9ad8\u7684\u7f51\u7edc\u5229\u7528\u7387\u3002\u8fde\u63a5\u53d1\u8d77\u7aef\u6216\u63a5\u6536\u7aef\u4e00\u822c\u5c06MSS\u503c\u8bbe\u7f6e\u4e3a\u5916\u51fa\u63a5\u53e3\u4e0a\u7684MTU\uff08\u6700\u5927\u4f20\u8f93\u5355\u5143\uff09\u957f\u5ea6\u51cf\u53bb\u56fa\u5b9a\u7684IP\u9996\u90e8\u548cTCP\u9996\u90e8\u957f\u5ea6\u3002<\/p>\n<h2>TCP \u7684\u534a\u5173\u95ed<\/h2>\n<p>TCP \u7684\u534a\u5173\u95ed\u662f\u6307\u8fde\u63a5\u7684\u4e00\u7aef\u5728\u7ed3\u675f\u5b83\u7684\u53d1\u9001\u540e\u8fd8\u80fd\u63a5\u6536\u6765\u81ea\u53e6\u4e00\u7aef\u6570\u636e\u7684\u80fd\u529b\u3002<\/p>\n<p>\u534a\u5173\u95ed\u4f7f\u4e00\u7aef\u53ef\u4ee5\u901a\u77e5\u53e6\u4e00\u7aef\u6570\u636e\u4f20\u8f93\u7ed3\u675f\uff0c\u4f46\u4ecd\u7136\u5728\u7b49\u5f85\u5bf9\u7aef\u7684\u8fd4\u56de\u6570\u636e\u3002<\/p>\n<h2>TCP \u72b6\u6001\u53d8\u8fc1\u56fe<\/h2>\n<p><img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/01\/TCP-state-transition.png\" alt=\"TCP\u72b6\u6001\u53d8\u8fc1\" \/><\/p>\n<h3>2MSL\u7b49\u5f85\u65f6\u95f4<\/h3>\n<p>\u4eceTCP\u72b6\u6001\u56fe\u53ef\u4ee5\u770b\u5230\uff0c\u6267\u884c\u4e3b\u52a8\u5173\u95ed\u540e\uff0cSocket\u4f1a\u8fdb\u5165\u4e00\u4e2a TIME_WAIT \u72b6\u6001\uff0c\u8fd9\u4e2a TIME_WAIT \u72b6\u6001\u4e5f\u79f0\u4e3a 2MSL\u7b49\u5f85\u72b6\u6001\u3002\u6bcf\u4e2a\u5177\u4f53TCP\u5b9e\u73b0\u5fc5\u987b\u9009\u62e9\u4e00\u4e2a\u62a5\u6587\u6bb5\u6700\u5927\u751f\u5b58\u65f6\u95f4MSL\uff08Maximum Segment Lifetime\uff09\uff0c\u5b83\u662f\u4efb\u4f55\u62a5\u6587\u6bb5\u88ab\u4e22\u5f03\u524d\u5728\u7f51\u7edc\u5185\u7684\u6700\u957f\u65f6\u95f4\u3002<\/p>\n<p>\u5bf9\u4e00\u4e2a\u5177\u4f53\u5b9e\u73b0\u6240\u7ed9\u5b9a\u7684MSL\u503c\uff0c\u5904\u7406\u7684\u539f\u5219\u662f\uff1a\u5f53TCP\u6267\u884c\u4e00\u4e2a\u4e3b\u52a8\u5173\u95ed\uff0c\u5e76\u53d1\u56de\u6700\u540e\u4e00\u4e2aACK\uff0c\u8be5\u8fde\u63a5\u5fc5\u987b\u5728 TIME_WAIT \u72b6\u6001\u505c\u7559\u7684\u65f6\u95f4\u4e3a 2\u500d\u7684MSL\uff0c\u8fd9\u6837\u53ef\u4ee5\u8ba9TCP\u518d\u6b21\u53d1\u9001\u6700\u540e\u7684 ACK \u4ee5\u9632\u6b62\u8fd9\u4e2a ACK \u4e22\u5931\uff08\u53e6\u4e00\u7aef\u8d85\u65f6\u5e76\u91cd\u53d1\u6700\u540e\u7684 FIN\uff09\u3002<\/p>\n<p><em>\u8fd9\u79cd 2MSL\u7b49\u5f85\u7684\u4e00\u4e2a\u7ed3\u679c\u662f\u8fd9\u4e2aTCP\u8fde\u63a5\u5728 2MSL\u7b49\u5f85\u671f\u95f4\uff0c\u5b9a\u4e49\u8fd9\u4e2a\u8fde\u63a5\u7684\u63a5\u53e3\u4e0d\u80fd\u518d\u88ab\u4f7f\u7528\u3002\u5927\u591a\u6570TCP\u5b9e\u73b0\u5f3a\u52a0\u4e86\u66f4\u4e3a\u4e25\u683c\u7684\u9650\u5236\uff0c\u5728 2MSL\u7b49\u5f85\u671f\u95f4\uff0csocket\u4e2d\u4f7f\u7528\u7684\u672c\u5730\u7aef\u53e3\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4e0d\u80fd\u518d\u88ab\u4f7f\u7528\u3002\u53ef\u4ee5\u901a\u8fc7 <code>SO_REUSEADDR<\/code> \u9009\u9879\u6765\u5141\u8bb8\u6216\u7981\u6b62\u4f7f\u7528\u5904\u4e8e 2MSL\u7b49\u5f85\u7684Socket\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48\u9700\u8981\u7531\u5ba2\u6237\u7aef\u6765\u6267\u884c\u4e3b\u52a8\u5173\u95ed\uff0c\u670d\u52a1\u5668\u6267\u884c\u88ab\u52a8\u5173\u95ed\uff0c\u8fd9\u6837\u670d\u52a1\u5668\u7aef\u4e0d\u4f1a\u8fdb\u5165 2MSL\u7b49\u5f85\uff0c\u56e0\u4e3a\u670d\u52a1\u5668\u7684\u7aef\u53e3\u662f\u719f\u77e5\u7684\uff0c\u6bd4\u5982 80\uff0c\u5982\u679c\u8be5\u7aef\u53e3\u5904\u4e8e 2MSL\u72b6\u6001\uff0c\u90a3\u4e48\u5728\u5173\u95ed\u540e\u5c31\u9700\u8981\u7b49\u5f85\u4e00\u5b9a\u65f6\u95f4\u624d\u80fd\u91cd\u65b0\u542f\u52a8\u5e94\u7528\u3002<\/em><\/p>\n<h3>FIN_WAIT_2 \u72b6\u6001<\/h3>\n<p>\u5728 FIN_WAIT_2 \u72b6\u6001\u6211\u4eec\u5df2\u7ecf\u53d1\u51fa\u4e86 FIN\uff0c\u5e76\u4e14\u53e6\u4e00\u7aef\u4e5f\u5df2\u5bf9\u5b83\u8fdb\u884c\u786e\u8ba4\u3002\u9664\u975e\u6211\u4eec\u5728\u5b9e\u73b0\u534a\u5173\u95ed\uff0c\u5426\u5219\u5c06\u7b49\u5f85\u53e6\u4e00\u7aef\u7684\u5e94\u7528\u5c42\u610f\u8bc6\u5230\u5b83\u5df2\u6536\u5230\u4e00\u4e2a\u6587\u4ef6\u7ed3\u675f\u7b26\u8bf4\u660e\uff0c\u5e76\u5411\u6211\u4eec\u53d1\u4e00\u4e2a FIN \u6765\u5173\u95ed\u53e6\u4e00\u65b9\u5411\u7684\u8fde\u63a5\u3002\u53ea\u6709\u5f53\u53e6\u4e00\u7aef\u7684\u8fdb\u7a0b\u5b8c\u6210\u8fd9\u4e2a\u5173\u95ed\uff0c\u6211\u4eec\u8fd9\u7aef\u624d\u4f1a\u4ece  FIN_WAIT_2 \u72b6\u6001\u8fdb\u5165 TIME_WAIT \u72b6\u6001\u3002<\/p>\n<p>\u8fd9\u610f\u5473\u7740\u6211\u4eec\u8fd9\u7aef\u53ef\u80fd\u6c38\u8fdc\u4fdd\u6301\u8fd9\u4e2a\u72b6\u6001\uff0c\u53e6\u4e00\u7aef\u4e5f\u5c06\u5904\u4e8e CLOSE_WAIT \u72b6\u6001\uff0c\u5e76\u4e00\u76f4\u4fdd\u6301\u8fd9\u4e2a\u72b6\u6001\u76f4\u5230\u5e94\u7528\u5c42\u51b3\u5b9a\u8fdb\u884c\u5173\u95ed\u3002<\/p>\n<h2>\u590d\u4f4d\u62a5\u6587\u6bb5<\/h2>\n<p>RST \u6807\u5fd7\u7f6e 1 \u8868\u793a\u590d\u4f4d\u62a5\u6587\u6bb5\u3002<\/p>\n<h3>\u5230\u4e0d\u5b58\u5728\u7684\u7aef\u53e3\u7684\u8fde\u63a5\u8bf7\u6c42<\/h3>\n<p>\u4ea7\u751f\u590d\u4f4d\u7684\u4e00\u79cd\u5e38\u89c1\u60c5\u51b5\u662f\u5f53\u8fde\u63a5\u8bf7\u6c42\u5230\u8fbe\u65f6\uff0c\u76ee\u7684\u7aef\u53e3\u6ca1\u6709\u8fdb\u7a0b\u5728\u76d1\u542c\u3002<\/p>\n<p>\u5728\u590d\u4f4d\u62a5\u6587\u6bb5\u4e2d\uff0c\u5e8f\u53f7\u88ab\u7f6e\u4e3a 0\uff0c\u786e\u8ba4\u5e8f\u53f7\u88ab\u7f6e\u4e3a\u8fdb\u5165\u7684ISN\u52a0\u4e0a\u6570\u636e\u5b57\u8282\u6570\uff08\u7531\u4e8e\u63a5\u6536\u5230\u7684\u662f SYN \u62a5\u6587\u6bb5\uff0c\u5360 1 \u4e2a\u5b57\u8282\uff0c\u6240\u4ee5\u786e\u8ba4\u5e8f\u53f7\u662fISN\u52a0 1\uff09\u3002RST \u6807\u5fd7\u7f6e 1\uff0cACK \u6807\u5fd7\u7f6e 0\u3002<\/p>\n<h3>\u5f02\u5e38\u7ec8\u6b62\u4e00\u4e2a\u8fde\u63a5<\/h3>\n<p>\u7ec8\u6b62\u4e00\u4e2a\u8fde\u63a5\u7684\u6b63\u5e38\u65b9\u5f0f\u662f\u4e00\u65b9\u53d1\u9001 FIN\uff0c\u8fd9\u4e5f\u79f0\u4e3a\u6709\u5e8f\u91ca\u653e\uff08orderly release\uff09\uff0c\u56e0\u4e3a\u5728\u6240\u6709\u6392\u961f\u6570\u636e\u90fd\u53d1\u9001\u4e4b\u540e\u624d\u53d1\u9001 FIN\uff0c\u6b63\u5e38\u60c5\u51b5\u4e0b\u6ca1\u6709\u4efb\u4f55\u6570\u636e\u4e22\u5931\u3002<\/p>\n<p>\u5f02\u5e38\u91ca\u653e\uff08abortive release\uff09\uff1a\u53d1\u9001\u4e00\u4e2a\u590d\u4f4d\u62a5\u6587\u6bb5\u800c\u4e0d\u662f FIN \u6765\u4e2d\u9014\u91ca\u653e\u4e00\u4e2a\u8fde\u63a5\u7684\u65b9\u5f0f\u3002<\/p>\n<p>\u5f02\u5e38\u7ec8\u6b62\u4e00\u4e2a\u8fde\u63a5\u5bf9\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\u6709\u4e24\u4e2a\u6709\u70b9\uff1a<\/p>\n<ul>\n<li>\u4e22\u5f03\u4efb\u4f55\u5f85\u53d1\u9001\u6570\u636e\u5e76\u7acb\u5373\u53d1\u9001\u590d\u4f4d\u62a5\u6587\u6bb5\uff1b<\/li>\n<li>RST\u7684\u63a5\u6536\u65b9\u4f1a\u533a\u5206\u53e6\u4e00\u7aef\u6267\u884c\u7684\u662f\u5f02\u5e38\u5173\u95ed\u8fd8\u662f\u6b63\u5e38\u5173\u95ed\u3002<\/li>\n<\/ul>\n<p>Socket API \u901a\u8fc7 \u201clinge on close\u201d \u9009\u9879\uff08SO_LINGER\uff09\u63d0\u4f9b\u4e86\u8fd9\u79cd\u5f02\u5e38\u5173\u95ed\u7684\u80fd\u529b\uff0c\u8fd9\u5c06\u5bfc\u81f4\u8fde\u63a5\u5173\u95ed\u65f6\u8fdb\u884c\u590d\u4f4d\u800c\u4e0d\u662f\u6b63\u5e38\u7684 FIN\u3002<\/p>\n<h3>\u68c0\u6d4b\u534a\u6253\u5f00\u8fde\u63a5<\/h3>\n<p>\u5982\u679c\u4e00\u65b9\u5df2\u7ecf\u5173\u95ed\u6216\u5f02\u5e38\u7ec8\u6b62\u8fde\u63a5\u800c\u53e6\u4e00\u65b9\u5374\u8fd8\u4e0d\u77e5\u9053\uff0c\u8fd9\u6837\u7684TCP\u8fde\u63a5\u6210\u4e3a\u534a\u6253\u5f00\uff08half-open\uff09\u7684\u3002<\/p>\n<h2>\u540c\u65f6\u6253\u5f00<\/h2>\n<p>\u4e00\u4e2a\u540c\u65f6\u6253\u5f00\u7684\u8fde\u63a5\u9700\u8981\u4ea4\u63624\u4e2a\u62a5\u6587\u6bb5\uff0c\u6bd4\u6b63\u5e38\u7684\u4e09\u6b21\u63e1\u624b\u591a\u4e00\u4e2a\u3002<\/p>\n<p><img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/01\/TCP-simultaneously-open.png\" alt=\"TCP\u540c\u65f6\u6253\u5f00\" \/><\/p>\n<h2>\u540c\u65f6\u5173\u95ed<\/h2>\n<p>\u53cc\u65b9\u90fd\u6267\u884c\u4e3b\u52a8\u5173\u95ed\u5373\u4e3a\u540c\u65f6\u5173\u95ed\uff08simultaneous close\uff09\u3002<\/p>\n<p>\u5f53\u5e94\u7528\u5c42\u53d1\u51fa\u5173\u95ed\u547d\u4ee4\u65f6\uff0c\u4e24\u7aef\u5747\u4ece ESTABLISHED \u53d8\u4e3a FIN_WAIT_1\uff0c\u53d1\u9001\u4e00\u4e2a FIN\uff1b\u6536\u5230\u5bf9\u7aef\u7684 FIN \u540e\uff0c\u72b6\u6001\u7531 FIN_WAIT_1 \u53d8\u8fc1\u5230 CLOSING\uff0c\u5e76\u53d1\u9001\u6700\u540e\u7684 ACK\uff0c\u6536\u5230\u5bf9\u7aef\u7684\u6700\u540e ACK \u540e\uff0c\u72b6\u6001\u53d8\u4e3a TIME_WAIT\u3002<\/p>\n<h2>TCP \u9009\u9879<\/h2>\n<p>\u6bcf\u4e2a\u9009\u9879\u7684\u5f00\u59cb\u662f1\u5b57\u8282\u7684kind\u5b57\u6bb5\uff0c\u8bf4\u660e\u9009\u9879\u7684\u7c7b\u578b\u3002kind\u5b57\u6bb5\u4e3a0\u548c1\u7684\u9009\u9879\u4ec5\u53601\u4e2a\u5b57\u8282\u3002\u5176\u4ed6\u9009\u9879\u5728kind\u5b57\u8282\u540e\u8fd8\u6709len\u5b57\u8282\uff0c\u5b83\u8bf4\u660e\u7684\u957f\u5ea6\u662f\u6307\u8be5\u9009\u9879\u7684\u603b\u957f\u5ea6\uff0c\u5305\u62eckind\u5b57\u8282\u548clen\u5b57\u8282\u3002<\/p>\n<p><img decoding=\"async\" src=\"\/\/coderbee.net\/wp-content\/uploads\/2014\/01\/TCP-options.png\" alt=\"TCP\u9009\u9879\" \/><\/p>\n<h2>TCP \u670d\u52a1\u5668\u8bbe\u8ba1<\/h2>\n<h3>\u547c\u5165\u8fde\u63a5\u8bf7\u6c42\u961f\u5217<\/h3>\n<p>TCP\u63a5\u53d7\u4e00\u4e2a\u8fde\u63a5\u662f\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u5e76\u653e\u5165\u8fde\u63a5\u961f\u5217\uff0c\u5e94\u7528\u5c42\u63a5\u53d7\u8fde\u63a5\u662f\u5c06\u5176\u4ece\u8be5\u961f\u5217\u4e2d\u79fb\u51fa\u3002<\/p>\n<hr\/>\n<p>\u6b22\u8fce\u5173\u6ce8\u6211\u7684\u5fae\u4fe1\u516c\u4f17\u53f7: <strong>coderbee\u7b14\u8bb0<\/strong>\uff0c\u53ef\u4ee5\u66f4\u53ca\u65f6\u56de\u590d\u4f60\u7684\u8ba8\u8bba\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"258\" height=\"258\" src=\"https:\/\/coderbee.net\/wp-content\/uploads\/2019\/01\/coderbee-note.jpg\" class=\"alignnone size-full wp-image-1707\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>TCP\u662f\u4e00\u4e2a\u9762\u5411\u8fde\u63a5\u7684\u534f\u8bae\uff0c\u65e0\u8bba\u54ea\u4e00\u65b9\u5411\u53e6\u4e00\u65b9\u53d1\u9001\u6570\u636e\u4e4b\u524d\uff0c\u90fd\u5fc5\u987b\u5148\u5728\u53cc\u65b9\u4e4b\u95f4\u5efa &hellip; <a href=\"https:\/\/coderbee.net\/index.php\/basis\/20140128\/767\">\u7ee7\u7eed\u9605\u8bfb <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83],"tags":[153],"_links":{"self":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/767"}],"collection":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/comments?post=767"}],"version-history":[{"count":5,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/767\/revisions"}],"predecessor-version":[{"id":782,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/posts\/767\/revisions\/782"}],"wp:attachment":[{"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/media?parent=767"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/categories?post=767"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/coderbee.net\/index.php\/wp-json\/wp\/v2\/tags?post=767"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}