{"id":442,"date":"2023-09-04T14:41:26","date_gmt":"2023-09-04T06:41:26","guid":{"rendered":"https:\/\/blog.taiyang.space\/?p=442"},"modified":"2023-09-04T14:41:26","modified_gmt":"2023-09-04T06:41:26","slug":"%e7%ac%ac3%e7%ab%a0-%e4%bc%a0%e8%be%93%e5%b1%82","status":"publish","type":"post","link":"https:\/\/blog.taiyang.space\/?p=442","title":{"rendered":"\u7b2c3\u7ae0-\u4f20\u8f93\u5c42"},"content":{"rendered":"<h2 id='31-\u4f20\u8f93\u5c42\u6982\u8ff0'>3.1 \u4f20\u8f93\u5c42\u6982\u8ff0<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436789.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436768.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h2 id='32-\u8fd0\u8f93\u5c42\u7aef\u53e3\u53f7\u590d\u7528\u4e0e\u5206\u7528\u7684\u6982\u5ff5'>3.2 \u8fd0\u8f93\u5c42\u7aef\u53e3\u53f7\u3001\u590d\u7528\u4e0e\u5206\u7528\u7684\u6982\u5ff5<\/h2>\n<h3 id='321-\u7aef\u53e3\u53f7'>3.2.1 \u7aef\u53e3\u53f7<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436847.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h3 id='322-\u53d1\u9001\u65b9\u7684\u590d\u7528\u548c\u63a5\u6536\u65b9\u7684\u5206\u7528'>3.2.2 \u53d1\u9001\u65b9\u7684\u590d\u7528\u548c\u63a5\u6536\u65b9\u7684\u5206\u7528<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436673.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436655.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h2 id='33-udp\u548ctcp\u7684\u5bf9\u6bd4'>3.3 UDP\u548cTCP\u7684\u5bf9\u6bd4<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436644.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436374.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436298.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<ul>\n<li>UDP\u4e0d\u4f1a\u5bf9\u5e94\u7528\u5c42\u62a5\u6587\u8fdb\u884c\u4efb\u4f55\u4fee\u6539\uff0c\u5728\u4f20\u9001\u7684\u8fc7\u7a0b\u4e2d\u53ea\u4f1a\u589e\u52a0\u548c\u79fb\u9664UDP\u9996\u90e8\uff0c\u6240\u4ee5\u662f\u9762\u5411\u5e94\u7528\u62a5\u6587\u7684\u3002<\/li>\n<li>TCP \u534f\u8bae\u4e2d\uff0c\u53d1\u9001\u65b9\u7684TCP\u628a\u5e94\u7528\u5c42\u4ea4\u4ed8\u4e0b\u6765\u7684\u6570\u636e\u5757\u770b\u6210\u4e00\u8fde\u4e32\u7684\u5b57\u8282\u6d41\uff0c\u7f16\u53f7\u5e76\u5b58\u50a8\u5728\u53d1\u9001\u7f13\u5b58\u4e2d\uff0cTCP\u6839\u636e\u53d1\u9001\u7b56\u7565\u9009\u53d6\u4e00\u90e8\u5206\u5b57\u8282\u6d41\u5e76\u6dfb\u52a0TCP\u9996\u90e8\u53d1\u9001\u51fa\u53bb\u3002\u63a5\u6536\u65b9\u7684TCP\u63a5\u53d7\u540e\u5c06\u5176\u8f6c\u53d8\u4e3a\u5b57\u8282\u6d41\u5b58\u5728\u7f13\u5b58\u4e2d\u5e76\u6839\u636e\u7b56\u7565\u53d1\u9001\u3002\u53d1\u9001\u65b9\u53d1\u9001\u7684\u6570\u636e\u5757\u548c\u63a5\u6536\u65b9\u63a5\u53d7\u5230\u7684\u6570\u636e\u5757\u4e2a\u6570\u4e0d\u7528\u76f8\u540c\uff0c\u4fdd\u8bc1\u5b57\u8282\u6d41\u76f8\u540c\u5373\u53ef\u3002<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436023.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436066.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h2 id='34-tcp\u6d41\u91cf\u63a7\u5236'>3.4 TCP\u6d41\u91cf\u63a7\u5236<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436006.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5047\u8bbe\u521d\u59cb\u6ed1\u52a8\u7a97\u53e3\u4e3a400\u5b57\u8282\uff0cTCP\u6570\u636e\u62a5\u6587\u6bb5\u6700\u5927\u63a5\u53d7100\u5b57\u8282\uff0cB\u4e3b\u673a\u9488\u5bf9\u81ea\u5df1\u7f13\u5b58\u4e2d\u5269\u4f59\u7a7a\u95f4\u7684\u60c5\u51b5\u5bf9\u4e3b\u673aA\u8fdb\u884c\u6d41\u91cf\u63a7\u5236\uff0c\u5177\u4f53\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436331.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u4e3b\u673aA\u6536\u52300\u7a97\u53e3\u7684\u901a\u77e5\u540e\u5c31\u4f1a\u542f\u52a8\u4e00\u4e2a\u6301\u7eed\u8ba1\u65f6\u5668\uff0c\u4f5c\u7528\u662f\u9632\u6b62B\u4e3b\u673a\u53d1\u51fa\u7684\u4fe1\u606f\u4e22\u5931\u9020\u6210\u7684\u6b7b\u9501\u3002\u9700\u8981\u6ce8\u610f\u7684\u662fTCP\u534f\u8bae\u89c4\u5b9a\uff0c\u5373\u65f6\u63a5\u6536\u7a97\u53e3\u4e3a0\uff0c\u4e5f\u5fc5\u987b\u63a5\u53d70\u7a97\u53e3\u63a2\u6d4b\u62a5\u6587\u6bb5\uff0c\u786e\u8ba4\u62a5\u6587\u6bb5\u4ee5\u53ca\u643a\u5e26\u7d27\u6025\u6570\u636e\u7684\u62a5\u6587\u6bb5\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436358.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5982\u679c0\u7a97\u53e3\u63a2\u6d4b\u62a5\u6587\u4e22\u5931\uff0c\u4e5f\u4e0d\u4f1a\u9020\u6210\u6b7b\u9501\uff0c\u56e0\u4e3a\u5b58\u5728\u91cd\u4f20\u8ba1\u65f6\u5668\u3002<\/p>\n<h2 id='35-tcp\u62e5\u585e\u63a7\u5236'>3.5 TCP\u62e5\u585e\u63a7\u5236<\/h2>\n<h3 id='351-\u5b9a\u4e49'>3.5.1 \u5b9a\u4e49<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436613.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h3 id='352-\u62e5\u585e\u63a7\u5236\u7b97\u6cd5'>3.5.2 \u62e5\u585e\u63a7\u5236\u7b97\u6cd5<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436580.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436802.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u6162\u5f00\u59cb\uff1a<\/p>\n<p>\u5728\u6162\u5f00\u59cb\u7b97\u6cd5\u4e2d\uff0c\u53d1\u9001\u65b9\u6bcf\u63a5\u6536\u5230\u4e00\u4e2a\u5bf9\u65b0\u62a5\u6587\u6bb5\u7684\u786e\u8ba4\u65f6\uff0c\u5c31\u5c06\u62e5\u585e\u7a97\u53e3+1\uff0c\u76f4\u5230\u62e5\u585e\u7a97\u53e3\u589e\u52a0\u5230\u6162\u5f00\u59cb\u95e8\u9650\u65f6\u6267\u884c\u62e5\u585e\u907f\u514d\u7b97\u6cd5\u3002<\/p>\n<p>\u62e5\u585e\u907f\u514d\uff1a<\/p>\n<p>\u6bcf\u6b21\u4f20\u8f93\u8f6e\u6b21\u7ed3\u675f\u540e\uff0c\u62e5\u585e\u7a97\u53e3\u53ea\u80fd\u7ebf\u6027+1\u3002\u5f53\u53d1\u751f\u8d85\u65f6\u91cd\u4f20\u65f6\uff0c\u5f88\u53ef\u80fd\u7f51\u7edc\u53d1\u9001\u4e86\u62e5\u585e\uff0c\u5219\u5c06\u6162\u5f00\u59cb\u95e8\u9650\u8c03\u6574\u4e3a\u53d1\u9001\u62e5\u585e\u65f6\u62e5\u585e\u7a97\u53e3\u7684\u4e00\u822c\uff0c\u5e76\u4e14\u5c06\u62e5\u585e\u7a97\u53e3\u91cd\u65b0\u8bbe\u7f6e\u4e3a1\uff0c\u91cd\u65b0\u5f00\u59cb\u6162\u5f00\u59cb\u7b97\u6cd5\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436229.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436046.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5feb\u91cd\u4f20\u7b97\u6cd5\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436994.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5feb\u6062\u590d\u7b97\u6cd5\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436397.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436364.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h2 id='36-tcp\u8d85\u65f6\u91cd\u4f20\u65f6\u95f4\u7684\u9009\u62e9'>3.6 TCP\u8d85\u65f6\u91cd\u4f20\u65f6\u95f4\u7684\u9009\u62e9<\/h2>\n<h3 id='361-rto\u7684\u9009\u62e9\u6807\u51c6'>3.6.1 RTO\u7684\u9009\u62e9\u6807\u51c6<\/h3>\n<p>RTO\u65f6\u95f4\u6bd4RTT\u77ed\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436656.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>RTO\u65f6\u95f4\u8fdc\u5927\u4e8eRTT\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436758.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u7ed3\u8bba\uff1a RTO\u5e94\u8be5\u7565\u5927\u4e8eRTT\uff0c\u4f46\u7531\u4e8e\u6bcf\u6b21\u62a5\u6587\u4f20\u8f93\u7684RTT\u90fd\u4e0d\u4e00\u5b9a\u76f8\u540c\uff0c\u6240\u4ee5\u8d85\u65f6\u91cd\u4f20\u65f6\u95f4\u4e0d\u80fd\u6839\u636e\u67d0\u6b21\u4f20\u8f93\u7684RTT\u51b3\u5b9a\u3002<\/p>\n<h3 id='362-rto\u7684\u8ba1\u7b97\u65b9\u6cd5'>3.6.2 RTO\u7684\u8ba1\u7b97\u65b9\u6cd5<\/h3>\n<p>\u53ef\u4ee5\u5229\u7528\u6bcf\u6b21\u6d4b\u5f97\u7684RTT\u6837\u672c\uff0c\u8ba1\u7b97\u52a0\u6743\u5e73\u5747\u5f80\u8fd4\u65f6\u95f4RTTs\uff08\u5e73\u6ed1\u7684\u5f80\u8fd4\u65f6\u95f4\uff09\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436966.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436092.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h3 id='363-rtt\u7684\u6d4b\u91cf\u65b9\u6cd5'>3.6.3 RTT\u7684\u6d4b\u91cf\u65b9\u6cd5<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436125.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436302.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436456.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h2 id='37-tcp\u53ef\u9760\u4f20\u8f93\u7684\u5b9e\u73b0'>3.7 TCP\u53ef\u9760\u4f20\u8f93\u7684\u5b9e\u73b0<\/h2>\n<p>TCP\u57fa\u4e8e\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u7684\u6ed1\u52a8\u7a97\u53e3\u6765\u5b9e\u73b0\u53ef\u9760\u4f20\u8f93\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436418.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5982\u4f55\u63cf\u8ff0\u53d1\u9001\u7a97\u53e3\u7684\u72b6\u6001\uff1f<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436476.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436661.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436916.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h2 id='38-tcp\u7684\u4f20\u8f93\u8fde\u63a5\u7ba1\u7406'>3.8 TCP\u7684\u4f20\u8f93\u8fde\u63a5\u7ba1\u7406<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436030.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h3 id='381-tcp\u7684\u8fde\u63a5\u5efa\u7acb'>3.8.1 TCP\u7684\u8fde\u63a5\u5efa\u7acb<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436209.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<ul>\n<li>TCP\u670d\u52a1\u5668\u8fdb\u7a0b\u5148\u521b\u5efa\u4f20\u8f93\u63a7\u5236\u5757\uff0c\u7136\u540e\u8fdb\u5165\u76d1\u542c\u72b6\u6001\uff0c\u5b58\u50a8TCP\u4f20\u8f93\u4e2d\u7684\u91cd\u8981\u4fe1\u606f\uff0c\u5185\u5bb9\u5982\u4e0b\uff1a<img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202309041436253.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/li>\n<li>TCP\u5ba2\u6237\u7aef\u8fdb\u7a0b\u9996\u5148\u4e5f\u662f\u521b\u5efa\u4f20\u8f93\u63a7\u5236\u5757\uff0c\u7136\u540e\u5411\u670d\u52a1\u5668\u8fdb\u7a0b\u53d1\u9001TCP\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\uff0c\u8fdb\u5165\u540c\u6b65\u5df2\u53d1\u9001\u72b6\u6001\uff0cTCP\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\u7684\u540c\u6b65\u4f4dSYN\u8bbe\u7f6e\u4e3a1\uff0c\u8868\u660e\u662f\u4e00\u4e2aTCP\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\uff0c\u5e8f\u53f7\u5b57\u6bb5seq\u8bbe\u7f6e\u4e3a\u4e00\u4e2a\u521d\u59cb\u503cx\uff0c\u4f5c\u4e3aTCP\u5ba2\u6237\u8fdb\u7a0b\u7684\u521d\u59cb\u5e8f\u53f7\uff0cTCP\u89c4\u5b9aSYN\u88ab\u8bbe\u7f6e\u4e3a1\u7684\u62a5\u6587\u6bb5\u4e0d\u80fd\u643a\u5e26\u6570\u636e\uff0c\u4f46\u662f\u8981\u6d88\u8017\u4e00\u4e2a\u5e8f\u53f7\u3002<\/li>\n<li>TCP\u670d\u52a1\u8fdb\u7a0b\u6536\u5230\u62a5\u6587\u540e\uff0c\u53d1\u9001TCP\u8fde\u63a5\u8bf7\u6c42\u786e\u8ba4\u62a5\u6587\u6bb5\uff0c\u8fdb\u5165\u540c\u6b65\u5df2\u63a5\u6536\u72b6\u6001\uff0cSYN\u548c\u786e\u8ba4\u4f4dACK\u90fd\u4e3a1\uff0c\u8868\u9762\u662f\u4e00\u4e2aTCP\u8fde\u63a5\u8bf7\u6c42\u786e\u8ba4\u62a5\u6587\u6bb5\uff0c\u5e8f\u53f7\u503cseq\u8bbe\u7f6e\u4e3a\u4e86\u4e00\u4e2a\u521d\u59cb\u5e8f\u53f7y\uff0c 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