{"id":23905,"date":"2025-04-19T08:46:21","date_gmt":"2025-04-19T00:46:21","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/23905.html"},"modified":"2025-04-19T08:46:21","modified_gmt":"2025-04-19T00:46:21","slug":"tcp%e4%b8%89%e6%ac%a1%e6%8f%a1%e6%89%8b%ef%bc%8c%e5%9b%9b%e6%ac%a1%e6%8c%a5%e6%89%8b%ef%bc%9b%e5%a4%9a%e8%bf%9b%e7%a8%8b%e3%80%81%e5%a4%9a%e7%ba%bf%e7%a8%8b%e5%ae%9e%e7%8e%b0%e5%b9%b6%e5%8f%91","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/23905.html","title":{"rendered":"TCP\u4e09\u6b21\u63e1\u624b\uff0c\u56db\u6b21\u6325\u624b\uff1b\u591a\u8fdb\u7a0b\u3001\u591a\u7ebf\u7a0b\u5b9e\u73b0\u5e76\u53d1\u670d\u52a1\u5668"},"content":{"rendered":"<h2>\u4e09\u6b21\u63e1\u624b&#xff0c;\u56db\u6b21\u6325\u624b<\/h2>\n<h3>\u4e09\u6b21\u63e1\u624b\u793a\u610f\u56fe&#xff1a;<\/h3>\n<p>SYN\u3001ACK\u662fTCP\u534f\u8bae\u5934\u91cc\u9762\u7684\u6807\u5fd7\u4f4d \u540c\u6b65 SYN&#xff1a;\u4ec5\u5728\u4e09\u6b21\u63e1\u624b\u5efa\u7acb TCP \u8fde\u63a5\u65f6\u6709\u6548\u3002\u5f53 SYN &#061; 1 \u800c ACK &#061; 0 \u65f6&#xff0c;\u8868\u660e\u8fd9\u662f\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5&#xff0c;\u5bf9\u65b9\u82e5\u540c\u610f\u5efa\u7acb\u8fde\u63a5&#xff0c;\u5219\u5e94\u5728\u76f8\u5e94\u7684\u62a5\u6587\u6bb5\u4e2d\u4f7f\u7528 SYN &#061; 1 \u548c ACK &#061; 1\u3002\u56e0\u6b64&#xff0c;SYN \u7f6e1 \u5c31\u8868\u793a\u8fd9\u662f\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\u6216\u8fde\u63a5\u63a5\u53d7\u62a5\u6587 ACK&#xff1a;\u786e\u8ba4 ACK&#xff1a;\u4ec5\u5f53 ACK&#061;1 \u65f6\u786e\u8ba4\u53f7\u5b57\u6bb5\u624d\u6709\u6548&#xff0c;TCP \u89c4\u5b9a&#xff0c;\u5728\u8fde\u63a5\u5efa\u7acb\u540e\u6240\u6709\u4f20\u8fbe\u7684\u62a5\u6587\u6bb5\u90fd\u5fc5\u987b\u628a ACK \u7f6e1 ack\u662f32\u4f4d\u786e\u8ba4\u53f7&#xff0c;\u671f\u671b\u6536\u5230\u5bf9\u65b9\u4e0b\u4e00\u4e2a\u62a5\u6587\u6bb5\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u5b57\u8282\u7684\u5e8f\u53f7\u6bcf\u5f53\u6709ACK\u4e86&#xff0c;\u786e\u8ba4\u53f7\u90fd\u8981\u52a0\u4e00 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419004619-6802f25b4f3b6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u5ba2\u6237\u7aef: CLOSED -&gt; SYN-SEND -&gt; ESTABLISHED \u670d\u52a1\u7aef&#xff1a;CLOSED -&gt; LISTEN -&gt; SYN-RECV -&gt; ESTABLISHED<\/p>\n<h4>\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u662f\u5176\u4ed6\u6b21\u6570&#xff1f;<\/h4>\n<p>\u901a\u4fe1\u53cc\u65b9\u90fd\u8981\u77e5\u9053\u5bf9\u65b9\u5177\u5907\u53d1\u9001\u548c\u63a5\u53d7\u7684\u80fd\u529b&#xff0c;\u8fd9\u6837\u624d\u662f\u4e00\u4e2a\u826f\u597d\u7684\u5173\u7cfb \u4e24\u6b21\u53ef\u80fd\u4f1a\u5bfc\u81f4\u8d44\u6e90\u7684\u6d6a\u8d39&#xff0c;\u56e0\u4e3a\u670d\u52a1\u5668\u4e0d\u77e5\u6653\u53d1\u9001\u7aef\u662f\u5426\u5177\u6709\u63a5\u6536\u4fe1\u606f\u7684\u80fd\u529b&#xff0c;\u6240\u4ee5\u6bcf\u4e00\u6b21\u63a5\u6536\u4fe1\u606f\u4ed6\u90fd\u4f1a\u53d1\u4e00\u4e2a\u786e\u8ba4\u6536\u5230\u548c\u8bf7\u6c42SYN\u7684\u4fe1\u606f\u3002 \u56db\u6b21\u662f\u53ef\u4ee5\u7684&#xff0c;\u53ea\u662f\u4f1a\u9020\u6210\u8d44\u6e90\u7684\u6d6a\u8d39&#xff0c;\u6700\u540e\u4f18\u5316\u6210\u4e09\u6b21<\/p>\n<h3>\u56db\u6b21\u6325\u624b\u793a\u610f\u56fe<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419004619-6802f25ba61c8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u65e0\u8bba\u662fhi\u54ea\u4e00\u65b9\u90fd\u53ef\u4ee5\u4e3b\u52a8\u53d1\u51fa\u65ad\u5f00\u8fde\u63a5 \u65ad\u5f00\u8fde\u63a5\u7684\u4e00\u65b9 &#xff1a; FIN_WAIT_1 -&gt; FIN_WAIT_2 -&gt; TIME_WAIT \u88ab\u65ad\u5f00\u7684\u4e00\u65b9&#xff1a;CLOSE_WAIT -&gt; LAST_ACK<\/p>\n<h4>\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u662f\u5176\u4ed6\u6b21\u6570&#xff1f;<\/h4>\n<p>TCP\u662f\u5168\u53cc\u5de5\u901a\u4fe1&#xff0c;\u53ef\u4ee5\u53cc\u5411\u4f20\u8f93\u6570\u636e&#xff0c;\u4efb\u4f55\u4e00\u65b9\u90fd\u53ef\u4ee5\u518d\u6570\u636e\u4f20\u9001\u7ed3\u675f\u4e4b\u540e\u53d1\u51fa\u8fde\u63a5\u91ca\u653e\u7684\u901a\u77e5&#xff0c;\u5f85\u63a5\u6536\u65b9\u786e\u8ba4\u4e4b\u540e\u8fdb\u5165\u534a\u5173\u95ed\u72b6\u6001\u3002\u8fd9\u4f1a\u53ef\u80fd\u63a5\u6536\u65b9\u8fd8\u6709\u4fe1\u606f\u8981\u53d1\u7ed9\u8bf7\u6c42\u65ad\u94fe\u65b9&#xff0c;\u56e0\u6b64\u8fd8\u6ca1\u6709\u5411\u5bf9\u65b9\u53d1\u4e00\u4e2a\u201c\u6211\u4e5f\u8bf7\u6c42\u65ad\u94fe\u201d\u7684\u6d88\u606f\u3002\u5f53\u63a5\u6536\u65b9\u53d1\u7684\u4e1c\u897f\u53d1\u5b8c\u4e4b\u540e&#xff0c;\u63a5\u6536\u65b9\u5c31\u53ef\u4ee5\u5411\u8bf7\u6c42\u65ad\u8054\u65b9\u53d1FIN\u201c\u6211\u8981\u65ad\u5f00\u201d\u7684\u6d88\u606f&#xff0c;\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u7684\u4e00\u65b9&#xff0c;\u6700\u540e\u4f1a\u8fdb\u5165\u4e00\u4e2a TIME_WAIT\u72b6\u6001&#xff0c;\u8fd9\u4e2a\u72b6\u6001\u4f1a\u6301\u7eed2msl<\/p>\n<h4>\u4e3a\u4ec0\u4e48\u8981\u7b492ml?<\/h4>\n<p>\u5f53 TCP \u8fde\u63a5\u4e3b\u52a8\u5173\u95ed\u65b9\u63a5\u6536\u5230\u88ab\u52a8\u5173\u95ed\u65b9\u53d1\u9001\u7684 FIN \u548c\u6700\u7ec8\u7684 ACK \u540e&#xff0c;\u8fde\u63a5\u7684\u4e3b\u52a8\u5173\u95ed\u65b9\u5fc5\u987b\u5904\u4e8eTIME_WAIT \u72b6\u6001\u5e76\u6301\u7eed 2MSL \u65f6\u95f4\u8fd9\u6837\u5c31\u80fd\u591f\u8ba9 TCP \u8fde\u63a5\u7684\u4e3b\u52a8\u5173\u95ed\u65b9\u5728\u5b83\u53d1\u9001\u7684 ACK \u4e22\u5931\u7684\u60c5\u51b5\u4e0b\u91cd\u65b0\u53d1\u9001\u6700\u7ec8\u7684 ACK\u3002\u56e0\u4e3a\u88ab\u65ad\u7684\u4e00\u65b9\u5982\u679c\u6ca1\u6536\u5230\u4e3b\u52a8\u65ad\u4e00\u65b9\u7684\u6700\u540e\u4e00\u4e2aACK\u7684\u8bdd&#xff0c;\u4f1a\u518d\u6b21\u53d1\u9001\u4e00\u6b21FIN&#xff0c;\u8fd9\u4e2a\u65f6\u95f4\u5c31\u662f\u7559\u5728\u8fd9\u91cc\u7528\u7684\u3002\u5982\u679c\u4e0d\u7b49&#xff0c;\u4e00\u65b9\u7ed3\u675f\u4e86\u53e6\u4e00\u65b9\u6ca1\u7ed3\u675f&#xff0c;\u90a3\u4e48\u5c31\u4e00\u76f4\u6d6a\u8d39\u8d44\u6e90<\/p>\n<h2>TCP\u7684\u6d41\u91cf\u63a7\u5236<\/h2>\n<ul>\n<li>\u6ed1\u52a8\u7a97\u53e3\u662f TCP \u4e2d\u5b9e\u73b0\u8bf8\u5982 ACK \u786e\u8ba4\u3001\u6d41\u91cf\u63a7\u5236\u3001\u62e5\u585e\u63a7\u5236\u7684\u627f\u8f7d\u7ed3\u6784<\/li>\n<li>TCP \u4e2d\u91c7\u7528\u6ed1\u52a8\u7a97\u53e3\u6765\u8fdb\u884c\u4f20\u8f93\u63a7\u5236&#xff0c;\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f\u610f\u5473\u7740\u63a5\u6536\u65b9\u8fd8\u6709\u591a\u5927\u7684\u7f13\u51b2\u533a\u53ef\u4ee5\u7528\u4e8e\u63a5\u6536\u6570\u636e\u3002\u53d1\u9001\u65b9\u53ef\u4ee5\u901a\u8fc7\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f\u6765\u786e\u5b9a\u5e94\u8be5\u53d1\u9001\u591a\u5c11\u5b57\u8282\u7684\u6570\u636e\u3002\u5f53\u6ed1\u52a8\u7a97\u53e3\u4e3a 0\u65f6&#xff0c;\u53d1\u9001\u65b9\u4e00\u822c\u4e0d\u80fd\u518d\u53d1\u9001\u6570\u636e\u62a5 \u6ed1\u52a8\u7a97\u53e3\u53ef\u4ee5\u7406\u89e3\u4e3a\u7f13\u51b2\u533a \u8fd9\u4e2a\u6ed1\u52a8\u7a97\u95e8\u4e3b\u8981\u662f\u63a5\u6536\u65b9\u6765\u7528\u7684\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419004619-6802f25bc9967.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/li>\n<\/ul>\n<h2>TCP\u901a\u4fe1\u5b9e\u4f8b\u56fe&#xff1a;<\/h2>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2025\/04\/20250419004620-6802f25c06b4b.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> win\u5c31\u4ee3\u8868\u63a5\u6536\u65b9\u7684\u6ed1\u52a8\u7a97\u53e3\u8fd8\u6709\u591a\u5c11\u7a7a\u4f59\u53ef\u4ee5\u63a5\u53d7\u7684\u5730\u65b9&#xff0c;\u8fd9\u6837\u53d1\u9001\u65b9\u4e5f\u80fd\u5bf9\u5e94\u8c03\u6574<\/p>\n<h2>TCP\u901a\u4fe1\u5e76\u53d1<\/h2>\n<h3>\u8981\u70b9<\/h3>\n<li>\u5229\u7528\u591a\u7ebf\u7a0b\u6216\u8005\u591a\u8fdb\u7a0b\u7684\u65b9\u5f0f&#xff0c;\u5b9e\u73b0\u591a\u4e2a\u5ba2\u6237\u7aef\u5bf9\u670d\u52a1\u5668\u7684\u8bbf\u95ee\u64cd\u4f5c&#xff0c;\u6bcf\u6b21\u4e00\u6709\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u5c31\u521b\u5efa\u65b0\u7684\u8fdb\u7a0b\u6216\u8005\u7ebf\u7a0b<\/li>\n<li>\u56de\u6536\u8d44\u6e90&#xff0c;\u5229\u7528\u4fe1\u53f7SIGCHILD&#043;waitpid\u5b9e\u73b0&#xff0c;\u5728\u5faa\u73afwhile(1)\u5185\u90e8<\/li>\n<li>\u5f53\u6bcf\u6b21\u91ca\u653e\u8fdb\u7a0b\u8d44\u6e90\u7684\u65f6\u5019&#xff0c;\u4f1a\u4f7f\u5f97\u521b\u5efa\u65b0\u8fdb\u7a0b\u7684while&#xff08;1)\u91cc\u9762\u7684accept\u88ab\u4fe1\u53f7\u8f6f\u4e2d\u65ad&#xff0c;\u8fd9\u4f1a\u5bfc\u81f4\u8fd9\u4e2a\u7684accept\u51fa\u9519&#xff0c;\u8fd9\u4e2a\u65f6\u5019\u9700\u8981\u8bbe\u7f6e\u5f53errorno&#061;ENTER\u7684\u65f6\u5019&#xff0c;\u518d\u91cd\u65b0\u9009\u6362\u4e00\u6b21\u521b\u5efa\u4e00\u4e2a\u65b0\u7684accept\u7b49\u5f85\u963b\u585e<\/li>\n<h3>\u591a\u8fdb\u7a0b\u5f00\u53d1<\/h3>\n<h4>\u9047\u5230\u7684\u95ee\u9898&#xff0c;\u53ca\u89e3\u51b3<\/h4>\n<ul>\n<li>\u65ad\u5f00\u8fde\u63a5\u540e&#xff0c;\u670d\u52a1\u5668\u7aef\u5982\u4f55\u5904\u7406\u5b50\u8fdb\u7a0b&#xff0c;\u56de\u6536\u8d44\u6e90&#xff1f;\n<ul>\n<li>\u4f7f\u7528\u4fe1\u53f7\u5904\u7406<\/li>\n<\/ul>\n<\/li>\n<li>\u4f7f\u7528\u4fe1\u53f7\u6355\u6349\u56de\u6536\u5b50\u8fdb\u7a0b\u8d44\u6e90\u540e&#xff0c;\u51fa\u73b0\u670d\u52a1\u7aefaccept: Interrupted system call&#xff0c;\u4e14\u4e0d\u80fd\u6709\u65b0\u5ba2\u6237\u7aef\u8fde\u63a5&#xff0c;\u5982\u4f55\u89e3\u51b3&#xff1f;\n<ul>\n<li>\u4ea7\u751fEINTR\u4fe1\u53f7&#xff0c;\u5177\u4f53\u8bf4\u660e\u901a\u8fc7man 2 accept\u67e5\u770b<\/li>\n<li>\u5728accept\u8fd4\u56de\u503c\u5904\u8fdb\u884c\u5224\u65ad\u5904\u7406&#xff0c;\u4e0d\u8f93\u51fa\u9519\u8bef\u5373\u53ef<\/li>\n<\/ul>\n<\/li>\n<li>\u5f53\u505c\u6b62\u6240\u6709\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\u540e&#xff0c;\u51fa\u73b0read: Connection reset by peer&#xff0c;\u5982\u4f55\u89e3\u51b3&#xff1f;\n<ul>\n<li>\u4ea7\u751f\u7684\u539f\u56e0&#xff1a;\u8fde\u63a5\u65ad\u5f00\u540e\u7684\u8bfb\u548c\u5199\u64cd\u4f5c\u5f15\u8d77\u7684<\/li>\n<li>\u7b80\u5355\u4fee\u6539&#xff1a;\u5c06\u5ba2\u6237\u7aef\u4e2d\u4f11\u7720\u8bed\u53e5\u7684\u4f4d\u7f6e\u8fdb\u884c\u66f4\u6539<\/li>\n<li>\u65b9\u6cd5&#xff1a;[261]Connection reset by 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