{"id":91774,"date":"2026-08-08T12:58:03","date_gmt":"2026-08-08T04:58:03","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/91774.html"},"modified":"2026-08-08T12:58:03","modified_gmt":"2026-08-08T04:58:03","slug":"%e3%80%90linux%e3%80%91%e4%bc%a0%e8%be%93%e5%b1%82%e5%8d%8f%e8%ae%aetcp","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/91774.html","title":{"rendered":"\u3010Linux\u3011\u4f20\u8f93\u5c42\u534f\u8baeTCP"},"content":{"rendered":"<\/p>\n<h4>\u76ee\u5f55<\/h4>\n<ul>\n<li>\u4e00\u3001\u4f20\u8f93\u5c42\u534f\u8baeTCP<\/li>\n<li>\n<ul>\n<li>1.1 TCP\u534f\u8bae\u683c\u5f0f<\/li>\n<li>1.2 \u5bf9TCP\u7684\u6b63\u786e\u8ba4\u8bc6<\/li>\n<li>1.3 \u5173\u4e8e\u6d41\u91cf\u63a7\u5236<\/li>\n<li>1.4 \u5173\u4e8e\u6807\u5fd7\u4f4d<\/li>\n<li>\n<ul>\n<li>\u5173\u4e8e\u4e09\u6b21\u63e1\u624b<\/li>\n<li>\u5173\u4e8e\u56db\u6b21\u6325\u624b<\/li>\n<li>\u91cd\u8c08\u4e09\u6b21\u63e1\u624b<\/li>\n<li>\u5176\u4ed6\u6807\u5fd7\u4f4d<\/li>\n<\/ul>\n<\/li>\n<li>1.5 \u8fde\u63a5\u7ba1\u7406\u673a\u5236<\/li>\n<li>1.6 \u518d\u8c08\u6d41\u91cf\u63a7\u5236<\/li>\n<li>1.7 \u5173\u4e8e\u6ed1\u52a8\u7a97\u53e3<\/li>\n<li>1.8 \u5173\u4e8e\u62e5\u585e\u63a7\u5236<\/li>\n<li>1.9 \u5176\u5b83\u673a\u5236<\/li>\n<li>\n<ul>\n<li>\u5ef6\u8fdf\u5e94\u7b54<\/li>\n<li>\u634e\u5e26\u5e94\u7b54<\/li>\n<\/ul>\n<\/li>\n<li>1.10 TCP\u5f02\u5e38\u60c5\u51b5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b756085f9.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4e2a\u4eba\u4e3b\u9875&#xff1a;\u77e2\u671b \u4e2a\u4eba\u4e13\u680f&#xff1a;C&#043;&#043;\u3001Linux\u7cfb\u7edf\u7f16\u7a0b\u3001Linux\u7f51\u7edc\u7f16\u7a0b\u3001C\u8bed\u8a00\u3001\u6570\u636e\u7ed3\u6784\u3001Coze-AI\u3001MySQL<\/p>\n<h2>\u4e00\u3001\u4f20\u8f93\u5c42\u534f\u8baeTCP<\/h2>\n<h3>1.1 TCP\u534f\u8bae\u683c\u5f0f<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b75631eed.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u56fe&#xff0c;TCP\u534f\u8bae\u5305\u542b\u5982\u4e0a\u7684\u5b57\u6bb5\u3002TCP\u62a5\u5934\u7684\u672c\u8d28\u548cUDP\u4e00\u6837\u4e5f\u662f\u534f\u8bae\u7ed3\u6784\u4f53\u3002<\/p>\n<p>linux-2.6.18\/include\/linux\/tcp.h&#xff1a;<\/p>\n<p><span class=\"token keyword\">struct<\/span> <span class=\"token class-name\">tcphdr<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n__u16source<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6e90\u7aef\u53e3<\/span><br \/>\n__u16dest<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u76ee\u7684\u7aef\u53e3<\/span><br \/>\n__u32seq<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 32\u4f4d\u5e8f\u53f7<\/span><br \/>\n__u32ack_seq<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 32\u4f4d\u786e\u8ba4\u5e8f\u53f7<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">if<\/span> <span class=\"token expression\"><span class=\"token function\">defined<\/span><span class=\"token punctuation\">(<\/span>__LITTLE_ENDIAN_BITFIELD<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n__u16res1<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><br \/>\ndoff<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><br \/>\nfin<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nsyn<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nrst<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\npsh<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nack<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nurg<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nece<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\ncwr<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">elif<\/span> <span class=\"token expression\"><span class=\"token function\">defined<\/span><span class=\"token punctuation\">(<\/span>__BIG_ENDIAN_BITFIELD<span class=\"token punctuation\">)<\/span><\/span><\/span><br \/>\n__u16doff<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><br \/>\nres1<span class=\"token operator\">:<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><br \/>\ncwr<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nece<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nurg<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nack<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\npsh<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nrst<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nsyn<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><br \/>\nfin<span class=\"token operator\">:<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">else<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">error<\/span><span class=\"token string\">&#034;Adjust your &lt;asm\/byteorder.h&gt; defines&#034;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">endif<\/span><\/span><br \/>\n__u16window<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 16\u4f4d\u7a97\u53e3\u5927\u5c0f<\/span><br \/>\n__u16check<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 16\u4f4d\u6821\u9a8c\u548c<\/span><br \/>\n__u16urg_ptr<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 16\u4f4d\u7d27\u6025\u6307\u9488<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u5728\u6536\u5230TCP\u62a5\u6587\u4e4b\u540e\u603b\u8981\u89e3\u51b3\u4e24\u4e2a\u95ee\u9898&#xff0c;\u7b2c\u4e00\u4e2a&#xff1a;\u62a5\u5934\u548c\u6709\u6548\u8f7d\u8377\u5206\u79bb\u7684\u95ee\u9898&#xff1b;\u7b2c\u4e8c\u4e2a\u6709\u6548\u8f7d\u8377\u5206\u7528\u7684\u95ee\u9898\u3002 \u5982\u4e0a\u56fe&#xff0c;tcp\u4e00\u884c\u5c31\u662f32\u4f4d&#xff0c;\u6240\u4ee5\u53bb\u6389\u9009\u9879&#xff0c;\u524d\u4e94\u884c\u5c31\u662f20\u5b57\u8282\u7684\u6570\u636e&#xff0c;4\u4f4d\u9996\u90e8\u5b57\u6bb5\u6807\u8bc6\u62a5\u5934\u7684\u957f\u5ea6(\u5305\u542b\u9009\u9879)&#xff0c;\u6240\u4ee5\u65e0\u8bba\u5e26\u4e0d\u5e26\u9009\u9879\u5b57\u6bb5&#xff0c;\u90fd\u53ef\u4ee5\u628atcp\u62a5\u5934\u548c\u6709\u6548\u8f7d\u8377\u5206\u79bb\u3002<\/p>\n<p>tcp\u62a5\u5934\u4e2d\u5b58\u5728\u4e00\u4e2a16\u4f4d\u76ee\u7684\u7aef\u53e3\u53f7&#xff0c;\u5b83\u53ef\u4ee5\u6807\u660e\u6709\u6548\u8f7d\u8377\u5e94\u8be5\u4ea4\u7ed9\u4e0a\u5c42\u7ed1\u5b9a\u76ee\u7684\u7aef\u53e3\u53f7\u7684\u8fdb\u7a0b&#xff0c;\u8fd9\u4e5f\u5c31\u89e3\u51b3\u4e86\u6709\u6548\u8f7d\u8377\u5206\u7528\u7684\u95ee\u9898\u3002<\/p>\n<p>4\u4f4d\u9996\u90e8\u957f\u5ea6\u7684\u53d6\u503c\u662f0~15&#xff0c;\u4f46\u662f\u5b83\u8bfb\u53d6\u4e4b\u540e\u9700\u8981*4\u6765\u8868\u793a\u5b9e\u9645\u62a5\u5934\u957f\u5ea6&#xff0c;\u7531\u4e8e\u9009\u9879\u5b57\u6bb5\u53ef\u5e26\u53ef\u4e0d\u5e26&#xff0c;\u6240\u4ee5\u9996\u90e8\u957f\u5ea6\u7684\u53d6\u503c\u8303\u56f4\u5c31\u662f[20\/5, 15]&#xff0c;\u5b83\u8868\u793a\u7684\u62a5\u5934\u5b9e\u9645\u53d6\u503c\u8303\u56f4\u5c31\u662f[20, 15 * 4]&#xff0c;\u4e5f\u5c31\u662f20~60\u3002\u5047\u8bbe\u62a5\u5934\u5b9e\u9645\u957f\u5ea6\u662f40&#xff0c;\u90a3\u4e484\u4f4d\u9996\u90e8\u957f\u5ea6\u5e94\u8be5\u586b\u519940\/4&#061;10\u3002<\/p>\n<h3>1.2 \u5bf9TCP\u7684\u6b63\u786e\u8ba4\u8bc6<\/h3>\n<p>TCP\u53eb\u505a\u53ef\u9760\u6027\u534f\u8bae&#xff0c;\u5982\u4f55\u7406\u89e3\u5462&#xff1f;<\/p>\n<p>\u5047\u8bbe\u6709\u4e24\u4e2a\u4e3b\u673a\u6b63\u5728\u901a\u4fe1&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b7565f36c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u4e3b\u673aA\u5411\u4e3b\u673aB\u53d1\u9001\u62a5\u6587\u4e4b\u540e&#xff0c;\u4e3b\u673aA\u662f\u4e0d\u77e5\u9053\u4e3b\u673aB\u662f\u5426\u6536\u5230\u62a5\u6587\u7684&#xff0c;\u53ea\u6709\u5f53\u4e3b\u673aB\u5bf9\u4e3b\u673aA\u7684\u62a5\u6587\u505a\u56de\u5e94\u65f6&#xff0c;\u4e3b\u673aA\u624d\u80fd\u591f\u786e\u8ba4\u4e4b\u524d\u7684\u62a5\u6587\u4e3b\u673aB\u6536\u5230\u4e86\u3002\u4f46\u662f\u540c\u6837\u7684&#xff0c;\u4e3b\u673aB\u505a\u51fa\u5e94\u7b54\u4e4b\u540e\u4e3b\u673aB\u5e76\u4e0d\u77e5\u9053\u4e3b\u673aA\u662f\u5426\u53d7\u5230\u4e86\u5e94\u7b54&#xff0c;\u9664\u975e\u4e3b\u673aA\u5bf9\u4e3b\u673aB\u7684\u5e94\u7b54\u505a\u51fa\u56de\u5e94\u3002<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u53d1\u73b0\u6ca1\u6709\u767e\u5206\u767e\u53ef\u9760\u7684\u534f\u8bae&#xff0c;\u56e0\u4e3a\u6700\u65b0\u53d1\u9001\u7684\u62a5\u6587\u6c38\u8fdc\u6ca1\u6709\u5e94\u7b54&#xff01;\u4f46\u662f\u5bf9\u5386\u53f2\u62a5\u6587\u7684\u53ef\u9760\u6027\u662f\u767e\u5206\u767e\u53ef\u4ee5\u786e\u5b9a\u7684\u3002<\/p>\n<p>\u6240\u4ee5TCP\u53eb\u505a\u53ef\u9760\u6027\u534f\u8bae&#xff0c;\u53ef\u4ee5\u7406\u89e3\u4e3a\u5bf9\u5386\u53f2\u62a5\u6587\u7684\u53ef\u9760\u6027\u3002<\/p>\n<hr \/>\n<p>TCP\u5b58\u5728\u4e24\u79cd\u5de5\u4f5c\u673a\u5236\u3002<\/p>\n<p>1\u3001\u7b2c\u4e00\u79cd&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b75670ffa.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> TCP\u771f\u6b63\u9760\u4fdd\u8bc1\u53ef\u9760\u7684\u662f\u62a5\u6587\u7684\u53ef\u9760\u6027&#xff0c;\u6240\u4ee5\u5f53\u4e00\u65b9\u7ed9\u53e6\u4e00\u65b9\u53d1\u9001\u62a5\u6587\u65f6&#xff0c;\u5bf9\u65b9\u5fc5\u987b\u81ea\u52a8\u5e94\u7b54\u62a5\u6587&#xff0c;\u8fd9\u6837\u53d1\u9001\u65b9\u5c31\u77e5\u9053\u9001\u8fbe\u4e86&#xff0c;\u5e94\u7b54\u65b9\u4e5f\u53d7\u5230\u4e86\u62a5\u6587\u3002\u6240\u4ee5\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u62a5\u6587\u7684\u53ef\u9760\u6027\u3002 \u53e6\u4e00\u65b9\u53d1\u9001\u62a5\u6587\u4e5f\u4e00\u6837&#xff0c;\u6536\u5230\u62a5\u6587\u7684\u4e00\u65b9\u5fc5\u987b\u81ea\u52a8\u5e94\u7b54\u62a5\u6587\u3002\u56e0\u6b64\u8fd9\u6837\u5c31\u4fdd\u8bc1\u4e86\u5168\u53cc\u5de5\u7684\u53ef\u9760\u6027\u3002 \u8fd9\u79cd\u53cc\u65b9\u671d\u5411\u4e0a&#xff0c;\u53d1\u9001\u62a5\u6587&#xff0c;\u5bf9\u62a5\u6587\u505a\u5e94\u7b54\u4fdd\u8bc1\u62a5\u6587\u672c\u8eab\u53ef\u9760\u6027\u7684\u673a\u5236\u53eb\u505a\u786e\u8ba4\u5e94\u7b54\u673a\u5236&#xff01; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b75682f0d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u53ef\u9760\u6027\u6709\u4e24\u4e2a\u65b9\u9762&#xff1a;\u4e00\u65b9\u9762\u662f\u4f60\u6536\u5230\u4e86\u62a5\u6587&#xff0c;\u53d1\u9001\u65b9\u9700\u8981\u77e5\u9053&#xff1b;\u53e6\u4e00\u65b9\u9762\u662f\u4f60\u6ca1\u6709\u6536\u5230\u62a5\u6587&#xff0c;\u53d1\u9001\u65b9\u4e5f\u5f97\u77e5\u9053\u3002 \u7b2c\u4e00\u65b9\u9762\u53d1\u9001\u65b9\u6536\u5230\u5e94\u7b54\u65f6&#xff0c;\u5c31\u4fdd\u8bc1\u4e86&#xff1b; \u53ef\u662f\u7b2c\u4e8c\u65b9\u9762\u6709\u4e24\u79cd\u60c5\u51b5&#xff0c;\u4e00\u79cd\u662f\u5bf9\u65b9\u786e\u5b9e\u6ca1\u6709\u6536\u5230\u62a5\u6587&#xff0c;\u53e6\u4e00\u79cd\u662f\u5bf9\u65b9\u6536\u5230\u4e86\u62a5\u6587\u4f46\u662f\u7ed9\u53d1\u9001\u65b9\u7684\u5e94\u7b54\u4e22\u4e86&#xff0c;\u5b83\u4eec\u7684\u7ed3\u679c\u90fd\u4e00\u6837&#xff0c;\u53d1\u9001\u65b9\u6ca1\u6709\u6536\u5230\u5e94\u7b54\u3002 \u6240\u4ee5\u53d1\u9001\u65b9\u4f1a\u7ed9\u62a5\u6587\u8bbe\u7f6e\u7b49\u5f85\u65f6\u95f4deadline&#xff0c;\u5982\u679c\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4&#xff0c;\u53d1\u9001\u65b9\u5c31\u8ba4\u4e3a\u5bf9\u65b9\u6ca1\u6709\u6536\u5230\u62a5\u6587\u3002\u56e0\u6b64\u5bf9\u4e8e\u53d1\u9001\u65b9\u800c\u8a00&#xff0c;\u5bf9\u65b9\u6709\u6ca1\u6709\u6536\u5230\u62a5\u6587&#xff0c;\u53d1\u9001\u65b9\u90fd\u6709\u4e00\u4e2a\u786e\u5b9a\u7684\u7ed3\u679c&#xff01;<\/p>\n<p>\u5f53\u53d1\u9001\u65b9\u8ba4\u4e3a\u5bf9\u65b9\u6ca1\u6709\u6536\u5230\u62a5\u6587\u65f6&#xff0c;\u5c31\u4f1a\u4f7f\u7528\u8d85\u65f6\u91cd\u4f20\u7b56\u7565(\u5bf9\u65b9\u6ca1\u6709\u6536\u5230\u62a5\u6587\u4e4b\u540e\u7684\u8865\u53d1\u63aa\u65bd)&#xff0c;\u7ed9\u5bf9\u65b9\u518d\u6b21\u53d1\u9001\u4e00\u4efd\u62a5\u6587\u3002\u5728\u63a5\u6536\u65b9\u89d2\u5ea6&#xff0c;\u8fd9\u4e2a\u62a5\u6587\u5b83\u4e4b\u524d\u53ef\u80fd\u6536\u5230\u8fc7\u4e86&#xff0c;\u4e5f\u53ef\u80fd\u6ca1\u6709\u6536\u5230&#xff0c;\u6240\u4ee5\u4ed6\u9700\u8981\u6709\u8fa8\u522b\u62a5\u6587\u662f\u5426\u6536\u5230\u7684\u80fd\u529b\u3002\u56e0\u6b64tcp\u62a5\u5934\u4e2d\u6709\u4e00\u4e2a32\u4f4d\u5e8f\u53f7\u5b57\u6bb5&#xff0c;\u5982\u679c\u8fd9\u4e2a\u62a5\u6587\u643a\u5e26\u7684\u5e8f\u53f7\u4ed6\u672c\u6765\u5c31\u6709&#xff0c;\u8bf4\u660e\u62a5\u6587\u91cd\u590d\u4e86&#xff0c;\u5c31\u53bb\u91cd&#xff0c;\u6240\u4ee532\u4f4d\u5e8f\u53f7\u5b57\u6bb5\u6709\u4e00\u4e2a\u53bb\u91cd\u7684\u529f\u80fd\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b756b288a.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045758-6a76b756eae6e.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5173\u4e8e\u8d85\u65f6\u91cd\u4f20\u7684\u7279\u5b9a\u65f6\u95f4\u95f4\u9694&#xff1a; \u6700\u7406\u60f3\u7684\u60c5\u51b5\u4e0b&#xff0c;\u4f1a\u627e\u5230\u4e00\u4e2a\u6700\u5c0f\u7684\u65f6\u95f4&#xff0c;\u4fdd\u8bc1&#034;\u786e\u8ba4\u5e94\u7b54\u4e00\u5b9a\u80fd\u5728\u8fd9\u4e2a\u65f6\u95f4\u5185\u8fd4\u56de&#034;\u3002\u4f46\u662f\u8fd9\u4e2a\u65f6\u95f4\u7684\u957f\u77ed&#xff0c;\u968f\u7740\u7f51\u7edc\u73af\u5883\u7684\u4e0d\u540c&#xff0c;\u662f\u6709\u5dee\u5f02\u7684\u3002\u5982\u679c\u8d85\u65f6\u65f6\u95f4\u8bbe\u5f97\u592a\u957f&#xff0c;\u4f1a\u5f71\u54cd\u6574\u4f53\u7684\u91cd\u4f20\u6548\u7387&#xff1b;\u5982\u679c\u8d85\u65f6\u65f6\u95f4\u8bbe\u5f97\u592a\u77ed&#xff0c;\u6709\u53ef\u80fd\u4f1a\u9891\u7e41\u53d1\u9001\u91cd\u590d\u7684\u5305&#xff1b;<\/p>\n<p>TCP\u4e3a\u4e86\u4fdd\u8bc1\u65e0\u8bba\u5728\u4f55\u79cd\u73af\u5883\u4e0b\u90fd\u80fd\u6bd4\u8f83\u9ad8\u6027\u80fd\u7684\u901a\u4fe1&#xff0c;\u56e0\u6b64\u4f1a\u52a8\u6001\u8ba1\u7b97\u8fd9\u4e2a\u6700\u5927\u8d85\u65f6\u65f6\u95f4\u3002<\/p>\n<ul>\n<li>Linux\u4e2d&#xff08;BSD Unix\u548cWindows\u4e5f\u662f\u5982\u6b64&#xff09;&#xff0c;\u8d85\u65f6\u4ee5500ms\u4e3a\u4e00\u4e2a\u5355\u4f4d\u8fdb\u884c\u63a7\u5236&#xff0c;\u6bcf\u6b21\u5224\u5b9a\u8d85\u65f6\u91cd\u53d1\u7684\u8d85\u65f6\u65f6\u95f4\u90fd\u662f500ms\u7684\u6574\u6570\u500d\u3002<\/li>\n<li>\u5982\u679c\u91cd\u53d1\u4e00\u6b21\u4e4b\u540e&#xff0c;\u4ecd\u7136\u5f97\u4e0d\u5230\u5e94\u7b54&#xff0c;\u7b49\u5f85 2*500ms \u540e\u518d\u8fdb\u884c\u91cd\u4f20\u3002<\/li>\n<li>\u5982\u679c\u4ecd\u7136\u5f97\u4e0d\u5230\u5e94\u7b54&#xff0c;\u7b49\u5f85 4*500ms \u8fdb\u884c\u91cd\u4f20\u3002\u4f9d\u6b21\u7c7b\u63a8&#xff0c;\u4ee5\u6307\u6570\u5f62\u5f0f\u9012\u589e\u3002<\/li>\n<li>\u7d2f\u8ba1\u5230\u4e00\u5b9a\u7684\u91cd\u4f20\u6b21\u6570&#xff0c;TCP\u8ba4\u4e3a\u7f51\u7edc\u6216\u8005\u5bf9\u7aef\u4e3b\u673a\u51fa\u73b0\u5f02\u5e38&#xff0c;\u5f3a\u5236\u5173\u95ed\u8fde\u63a5\u3002<\/li>\n<\/ul>\n<p>2\u3001\u7b2c\u4e8c\u79cd&#xff1a; \u5728\u5b9e\u9645\u7684\u53d1\u9001\u8fc7\u7a0b\u4e2d\u6ca1\u6709\u4f7f\u7528\u7b2c\u4e00\u79cd&#xff0c;\u56e0\u4e3a\u5b83\u7684\u6548\u7387\u592a\u4f4e\u4e86&#xff0c;\u4e00\u6b21\u53ea\u53d1\u9001\u4e00\u4e2a\u62a5\u6587\u3002\u5b9e\u9645\u60c5\u51b5\u662f\u4e00\u6b21\u53d1\u9001\u4e00\u6279\u62a5\u6587\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045759-6a76b7572c5e4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u63a5\u6536\u65b9\u5728\u6536\u5230\u8fd9\u4e00\u6279\u62a5\u6587\u65f6\u9700\u8981\u5bf9\u6bcf\u4e2a\u62a5\u6587\u90fd\u505a\u5e94\u7b54\u3002<\/p>\n<p>\u7531\u4e8e\u53d1\u9001\u7684\u662f\u4e00\u6279\u62a5\u6587&#xff0c;\u5e76\u4e14\u7f51\u7edc\u7684\u62d3\u6251\u7ed3\u6784\u5341\u5206\u590d\u6742&#xff0c;\u6240\u4ee5\u63a5\u6536\u65b9\u5728\u6536\u5230\u4e4b\u540e\u53ef\u80fd\u5b58\u5728\u4e71\u5e8f\u95ee\u9898&#xff0c;\u6bd4\u5982\u53d1\u9001\u65b9\u662f1\u30012\u30013\u30014\u53d1\u7684&#xff0c;\u4f46\u63a5\u6536\u65b9\u662f3\u30012\u30014\u30011\u6536\u5230\u7684\u3002\u4e71\u5e8f\u5c31\u662f\u4e00\u79cd\u4e0d\u53ef\u9760&#xff0c;\u6240\u4ee5\u9700\u8981\u89e3\u51b3\u4e71\u5e8f\u95ee\u9898\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045759-6a76b7573e208.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4f55\u89e3\u51b3\u4e71\u5e8f\u95ee\u9898\u5462&#xff1f;TCP\u534f\u8bae\u62a5\u5934\u4e2d\u5b58\u572832\u4f4d\u5e8f\u53f7&#xff0c;\u63a5\u6536\u65b9\u53ea\u8981\u6309\u7167\u62a5\u6587\u5e8f\u53f7\u6392\u5e8f\u5c31\u53ef\u4ee5\u89e3\u51b3\u4e71\u5e8f\u95ee\u9898\u4e86\u3002<\/p>\n<p>\u7531\u4e8e\u53d1\u9001\u65b9\u9700\u8981\u63a5\u53d7\u5230\u5bf9\u65b9\u5bf9\u8fd9\u4e00\u6279\u62a5\u6587\u7684\u5e94\u7b54&#xff0c;\u4f46\u662f\u5b83\u53ef\u80fd\u4f1a\u4e00\u4e0b\u5b50\u6536\u5230\u5f88\u591a\u5e94\u7b54&#xff0c;\u5f88\u5bb9\u6613\u5206\u4e0d\u6e05&#xff0c;\u6240\u4ee5tcp\u534f\u8bae\u62a5\u5934\u4e2d\u8fd8\u6709\u4e00\u4e2a32\u4f4d\u786e\u8ba4\u5e8f\u53f7&#xff0c;\u8fd9\u4e2a\u786e\u8ba4\u5e8f\u53f7\u662f\u81ea\u5df1\u6536\u5230\u7684\u62a5\u6587\u5e8f\u53f7&#043;1\u3002\u5b83\u7684\u542b\u4e49\u662f\u8be5\u5e8f\u53f7\u4e4b\u524d\u7684\u6240\u6709\u6570\u636e&#xff0c;\u6211\u90fd\u6536\u5230\u4e86\u3002\u6ce8\u610f\u662f\u6240\u6709&#xff01;<\/p>\n<p>\u8fd9\u4e2a\u786e\u8ba4\u9700\u8981\u7b80\u76f4\u662f\u5929\u624d\u8bbe\u8ba1&#xff0c;\u5982\u679c\u53d1\u9001\u65b9\u53d1\u9001\u4e86\u5e8f\u53f7\u4e3a1000\u30012000\u30013000\u30014000\u7684\u62a5\u6587&#xff0c;\u4f46\u5e94\u7b54\u53ea\u6536\u5230\u4e861001\u30014001&#xff0c;\u53e6\u5916\u4e24\u4e2a\u6ca1\u6709\u6536\u5230&#xff0c;\u90a3\u4e48\u53d1\u9001\u65b9\u5c31\u77e5\u90534001\u4e4b\u524d\u7684\u6240\u6709\u62a5\u6587&#xff0c;\u5bf9\u65b9\u90fd\u6536\u5230\u4e86&#xff01;\u8fd9\u6709\u6548\u51cf\u5c11\u4e86\u62a5\u6587\u7684\u91cd\u53d1\u6b21\u6570&#xff0c;\u63d0\u9ad8\u4e86\u6548\u7387\u3002 \u6b64\u5916&#xff0c;\u5982\u679c\u63a5\u6536\u65b9\u53ea\u63a5\u6536\u5230\u4e861000\u30012000\u30014000&#xff0c;\u90a3\u4e48\u5728\u586b\u5199\u8fd9\u4e09\u4e2a\u7684\u786e\u8ba4\u5e8f\u53f7\u65f6\u5c31\u662f1001\u30012001\u30012001\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a;\u7ad9\u5728\u4f20\u8f93\u5c42\u89d2\u5ea6&#xff0c;\u4e0d\u8981\u8ba4\u4e3a\u53cc\u65b9\u53d1\u9001\u3001\u5e94\u7b54\u7684\u662f\u6570\u636e\u8fd9\u4e2a\u6a21\u7cca\u7684\u6982\u5ff5&#xff0c;\u5b83\u4eec\u53d1\u9001\u3001\u5e94\u7b54\u7684\u662fTCP\u62a5\u6587&#xff01;\u5305\u542bTCP\u62a5\u5934&#043;\u6709\u6548\u8f7d\u8377&#xff01;<\/p>\n<hr \/>\n<p>\u634e\u5e26\u5e94\u7b54&#xff1a; \u770b\u5230\u4e0a\u9762\u7684TCP\u62a5\u5934\u5b83\u6709\u4e24\u4e2a\u5e8f\u53f7&#xff0c;\u4e00\u4e2a\u5e8f\u53f7&#xff0c;\u4e00\u4e2a\u786e\u8ba4\u5e8f\u53f7\u3002\u4f46\u662f\u4e0d\u662f\u53ea\u9700\u8981\u4e00\u4e2a\u5c31\u597d\u4e86\u5417&#xff1f;\u53d1\u9001\u65b9\u6709\u4e00\u4e2a\u5e8f\u53f7\u5c31\u597d\u4e86&#xff0c;\u63a5\u6536\u65b9\u6709\u4e00\u4e2a\u786e\u8ba4\u5e94\u7b54\u5c31\u597d\u4e86\u5440\u3002\u8fd9\u662f\u56e0\u4e3aTCP\u662f\u5168\u53cc\u5de5\u901a\u4fe1&#xff0c;\u5bf9\u65b9\u5728\u5e94\u7b54\u7684\u540c\u65f6\u53ef\u80fd\u8fd8\u60f3\u643a\u5e26\u6570\u636e&#xff0c;\u8fd9\u5c31\u662f\u634e\u5e26\u5e94\u7b54\u3002\u4f60\u770b\u5230\u7684\u5e94\u7b54\u53ef\u80fd\u65e2\u662f\u5e94\u7b54\u53c8\u5b58\u5728\u6709\u6548\u8f7d\u8377\u3002\u6240\u4ee5\u6709\u4e86\u5e8f\u53f7\u548c\u786e\u8ba4\u5e8f\u53f7&#xff0c;\u53d1\u9001\u6570\u636e\u548c\u53d1\u9001\u786e\u8ba4\u5c31\u53ef\u4ee5\u540c\u65f6\u8fdb\u884c\u4e86\u3002<\/p>\n<p>\u56e0\u6b64\u5e8f\u53f7\u548c\u786e\u8ba4\u5e8f\u53f7\u80fd\u591f\u505a\u5230\u53bb\u91cd\u3001\u6309\u5e8f\u5230\u8fbe\u3001\u634e\u5e26\u5e94\u7b54\u3001\u8d85\u65f6\u91cd\u4f20\u7b49\u673a\u5236\u3002<\/p>\n<h3>1.3 \u5173\u4e8e\u6d41\u91cf\u63a7\u5236<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045759-6a76b7576b665.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u53cc\u65b9\u5728\u901a\u4fe1\u7684\u65f6\u5019\u90fd\u662f\u6709\u63a5\u6536\u7f13\u51b2\u533a\u7684&#xff0c;\u5982\u679c\u63a5\u6536\u7f13\u51b2\u533a\u7684\u7a7a\u95f4\u4e0d\u8db3\u4ee5\u5bb9\u7eb3\u5bf9\u65b9\u53d1\u6765\u7684\u62a5\u6587&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u65f6\u5019\u5c31\u662f\u4e0d\u53ef\u9760\u7684\u3002TCP\u8981\u4fdd\u8bc1\u53ef\u9760\u6027&#xff0c;\u6240\u4ee5\u5c31\u9700\u8981\u8fdb\u884c\u6d41\u91cf\u63a7\u5236&#xff0c;\u8981\u53d1\u9001\u5bf9\u65b9\u80fd\u591f\u63a5\u6536\u5927\u5c0f\u7684\u6570\u636e\u3002<\/p>\n<p>\u63a5\u6536\u65b9\u7684\u63a5\u6536\u80fd\u529b\u5c31\u662f\u81ea\u5df1\u7684\u63a5\u6536\u7f13\u51b2\u533a\u5269\u4f59\u7a7a\u95f4\u7684\u5927\u5c0f\u3002\u5728TCP\u534f\u8bae\u62a5\u5934\u4e2d\u6709\u4e00\u4e2a\u5b57\u6bb5\u662f16\u4f4d\u7a97\u53e3\u5927\u5c0f&#xff0c;\u60f3\u8981\u8ba9\u53d1\u9001\u65b9\u77e5\u9053\u81ea\u5df1\u7684\u63a5\u53d7\u80fd\u529b&#xff0c;\u53ea\u9700\u8981\u628a\u5269\u4f59\u7a7a\u95f4\u5927\u5c0f&#xff0c;\u586b\u5199\u5728\u5e94\u7b54\u62a5\u6587\u768416\u4f4d\u7a97\u53e3\u5927\u5c0f\u4e2d\u5c31\u597d\u4e86\u3002\u81ea\u5df1\u7684\u534f\u8bae\u62a5\u593416\u4f4d\u7a97\u53e3\u5927\u5c0f\u662f\u586b\u5199\u7ed9\u5bf9\u65b9\u7684&#xff0c;\u56e0\u4e3a\u6784\u5efa\u7684\u62a5\u6587\u90fd\u662f\u53d1\u9001\u7ed9\u5bf9\u65b9\u7684\u3002<\/p>\n<p>\u63d0\u5230\u6d41\u91cf\u63a7\u5236&#xff0c;\u4e0d\u8981\u53ea\u60f3\u5230\u662f\u5bf9\u65b9\u53d1\u7684\u62a5\u6587\u592a\u591a\u4e86&#xff0c;\u8ba9\u5b83\u53d1\u7684\u6162\u4e00\u70b9&#xff1b;\u4e5f\u53ef\u4ee5\u662f\u5bf9\u65b9\u53d1\u7684\u592a\u6162\u4e86&#xff0c;\u8ba9\u5b83\u5feb\u4e00\u70b9\u3002\u6240\u4ee5\u6d41\u91cf\u63a7\u5236\u662f\u5305\u542b\u53ef\u9760\u6027\u548c\u6548\u7387\u7684\u3002<\/p>\n<h3>1.4 \u5173\u4e8e\u6807\u5fd7\u4f4d<\/h3>\n<p>\u5728\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u901a\u4fe1\u7684\u8fc7\u7a0b\u4e2d&#xff0c;\u53ef\u80fd\u4f1a\u6709\u5f88\u591a\u7684\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u7aef\u53d1\u9001\u62a5\u6587&#xff0c;\u8fd9\u4e9b\u62a5\u6587\u672c\u8eab\u662f\u6709\u7c7b\u578b\u7684&#xff0c;\u4f8b\u5982\u6709\u7684\u62a5\u6587\u662f\u5e94\u7b54\u62a5\u6587&#xff0c;\u6709\u7684\u662f\u5efa\u7acb\u8fde\u63a5\u62a5\u6587&#xff0c;\u6709\u7684\u662f\u65ad\u5f00\u8fde\u63a5\u62a5\u6587&#xff0c;\u6709\u7684\u662f\u6570\u636e\u62a5\u6587\u7b49\u7b49&#xff0c;\u6240\u4ee5\u5728TCP\u7684\u534f\u8bae\u62a5\u5934\u4e2d&#xff0c;\u5c31\u5fc5\u987b\u6709\u5bf9\u5e94\u7684\u5b57\u6bb5\u8868\u660e\u62a5\u6587\u7684\u7c7b\u578b\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045800-6a76b758b13d8.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u5728\u534f\u8bae\u62a5\u5934\u4e2d\u5c31\u6709\u4e86\u5e38\u89c1\u76846\u4e2a\u6807\u5fd7\u4f4d\u533a\u5206\u62a5\u6587\u7c7b\u578b\u3002<\/p>\n<table>\n<tr>\u6807\u5fd7\u4f4d\u540d\u79f0\u6838\u5fc3\u4f5c\u7528&#xff08;\u4e00\u53e5\u8bdd&#xff09;<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">SYN<\/td>\n<td align=\"left\">\u540c\u6b65\u4f4d<\/td>\n<td align=\"left\">\u8bf7\u6c42\u5efa\u7acb\u8fde\u63a5\u3002\u5728\u4e09\u6b21\u63e1\u624b\u65f6&#xff0c;\u53d1\u9001\u65b9\u5c06\u6b64\u4f4d\u7f6e1&#xff0c;\u8868\u793a\u5e0c\u671b\u4e0e\u5bf9\u65b9\u540c\u6b65\u5e8f\u5217\u53f7\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">ACK<\/td>\n<td align=\"left\">\u786e\u8ba4\u4f4d<\/td>\n<td align=\"left\">\u786e\u8ba4\u6570\u636e\u5df2\u6536\u5230\u3002\u5f53\u6b64\u4f4d\u7f6e1\u65f6&#xff0c;\u62a5\u5934\u4e2d\u7684\u786e\u8ba4\u5e8f\u53f7\u5b57\u6bb5\u624d\u6709\u6548\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">FIN<\/td>\n<td align=\"left\">\u7ed3\u675f\u4f4d<\/td>\n<td align=\"left\">\u8bf7\u6c42\u91ca\u653e\u8fde\u63a5\u3002\u53d1\u9001\u65b9\u5b8c\u6210\u6570\u636e\u53d1\u9001\u540e&#xff0c;\u5c06\u6b64\u4f4d\u7f6e1&#xff0c;\u8868\u793a\u4e0d\u518d\u53d1\u9001\u6570\u636e&#xff0c;\u8bf7\u6c42\u5173\u95ed\u8fde\u63a5\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">RST<\/td>\n<td align=\"left\">\u590d\u4f4d\u4f4d<\/td>\n<td align=\"left\">\u5f3a\u5236\u7ec8\u6b62\u8fde\u63a5\u3002\u5f53\u53d1\u751f\u4e0d\u53ef\u6062\u590d\u7684\u9519\u8bef&#xff08;\u5982\u8fde\u63a5\u8bf7\u6c42\u88ab\u62d2\u7edd\u3001\u5f02\u5e38\u4e2d\u65ad&#xff09;\u65f6\u7f6e1&#xff0c;\u7acb\u5373\u91cd\u7f6e\u8fde\u63a5\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">PSH<\/td>\n<td align=\"left\">\u63a8\u9001\u4f4d<\/td>\n<td align=\"left\">\u50ac\u4fc3\u63a5\u6536\u65b9\u5c3d\u5feb\u5c06\u6570\u636e\u4ea4\u4ed8\u7ed9\u5e94\u7528\u5c42&#xff0c;\u800c\u975e\u7b49\u5f85\u7f13\u51b2\u533a\u586b\u6ee1\u3002<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">URG<\/td>\n<td align=\"left\">\u7d27\u6025\u4f4d<\/td>\n<td align=\"left\">\u6807\u8bb0\u6570\u636e\u4e2d\u6709\u7d27\u6025\u5185\u5bb9&#xff0c;\u9700\u4f18\u5148\u5904\u7406\u3002\u4e0e16\u4f4d\u7d27\u6025\u6307\u9488\u914d\u5408\u4f7f\u7528&#xff0c;\u6307\u660e\u7d27\u6025\u6570\u636e\u5728\u6d41\u4e2d\u7684\u4f4d\u7f6e\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>\u5173\u4e8e\u4e09\u6b21\u63e1\u624b<\/h4>\n<p>TCP\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5\u3002<\/p>\n<p>\u9996\u5148\u4ec0\u4e48\u662f\u8fde\u63a5\u5440&#xff1f; \u5ba2\u6237\u7aef\u53ef\u80fd\u4f1a\u8bbf\u95ee\u5404\u79cdapp&#xff0c;\u670d\u52a1\u7aef\u53ef\u80fd\u4f1a\u6536\u5230\u591a\u4e2a\u5ba2\u6237\u7aef\u7684\u62a5\u6587&#xff0c;\u6240\u4ee5\u53cc\u65b9\u7684\u64cd\u4f5c\u7cfb\u7edf\u90fd\u4f1a\u5b58\u5728\u5927\u91cf\u7684\u8fde\u63a5&#xff0c;OS\u9700\u8981\u5bf9\u8fd9\u4e9b\u8fde\u63a5\u8fdb\u884c\u7ba1\u7406&#xff0c;\u4e5f\u5c31\u662f\u5148\u63cf\u8ff0&#xff0c;\u518d\u7ec4\u7ec7\u3002\u6240\u4ee5\u5c31\u9700\u8981\u6784\u5efa\u8fde\u63a5\u7ed3\u6784\u4f53&#xff0c;\u5728Linux\u5185\u6838\u6e90\u7801\u4e2d&#xff0c;\u8fde\u63a5\u7ed3\u6784\u4f53\u53eb\u505atcp_sock\u3002 <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b7590ab7f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u4e00\u4e2aTCP\u8fde\u63a5\u5728Linux\u5185\u6838\u4e2d\u5c31\u662f\u7531\u4e00\u4e2a struct tcp_sock \u7ed3\u6784\u4f53\u6765\u4ee3\u8868\u7684\u3002<\/p>\n<p>\u4e09\u6b21\u63e1\u624b\u7684\u8fc7\u7a0b&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b7592ec05.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u6ce8\u610f\u5b83\u4eec\u53d1\u7684\u5e76\u4e0d\u662f\u5355\u5355\u4e00\u4e2a\u6807\u5fd7\u4f4d&#xff0c;\u800c\u662fTCP\u534f\u8bae\u62a5\u6587\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u975e\u8981\u662f\u4e09\u6b21\u63e1\u624b\u5462&#xff1f; \u53cc\u65b9\u5728\u8fdb\u884c\u7f51\u7edc\u901a\u4fe1\u4e4b\u524d&#xff0c;\u9996\u5148\u8981\u4fdd\u8bc1\u7f51\u7edc\u662f\u901a\u7545\u7684&#xff0c;\u901a\u8fc7\u9a8c\u8bc1\u5168\u53cc\u5de5\u53ef\u4ee5\u786e\u4fdd\u7f51\u7edc\u662f\u901a\u7545\u7684\u3002\u5982\u4e0a\u56fe&#xff0c;\u53d1\u9001\u65b9\u4e3b\u673aA\u5728\u6536\u5230\u63a5\u6536\u65b9B\u7ed9\u5b83\u7684\u5e94\u7b54\u540e&#xff0c;\u4e3b\u673aA\u5c31\u786e\u8ba4\u5b83\u65e2\u80fd\u53d1&#xff0c;\u4e5f\u80fd\u6536\u4e86\u3002\u4f46\u662f\u6b64\u65f6\u4e3b\u673aB\u53ea\u80fd\u786e\u8ba4\u81ea\u5df1\u80fd\u6536\u62a5\u6587&#xff0c;\u80fd\u4e0d\u80fd\u53d1\u62a5\u6587\u5b83\u4e0d\u786e\u5b9a&#xff0c;\u6240\u4ee5\u5c31\u9700\u8981\u4e3b\u673aA\u7ed9\u5b83\u53d1\u9001\u5e94\u7b54\u62a5\u6587&#xff0c;\u786e\u4fdd\u8ba9\u4e3b\u673aB\u786e\u8ba4\u5b83\u53ef\u4ee5\u53d1\u62a5\u6587\u3002 \u91c7\u7528\u4e09\u6b21\u63e1\u624b\u7684\u65b9\u5f0f\u5c31\u786e\u4fdd\u4e86\u53cc\u65b9\u90fd\u9a8c\u8bc1\u4e86\u81ea\u5df1\u7684\u5168\u53cc\u5de5\u901a\u4fe1\u3002\u4e09\u6b21\u63e1\u624b\u662f\u6700\u5c11\u7684\u4fdd\u8bc1\u6b21\u6570\u3002<\/p>\n<h4>\u5173\u4e8e\u56db\u6b21\u6325\u624b<\/h4>\n<p>TCP\u901a\u8fc7\u56db\u6b21\u6325\u624b\u65ad\u5f00\u8fde\u63a5\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b7594c476.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u53cc\u65b9\u901a\u4fe1\u662f\u5168\u53cc\u5de5\u901a\u4fe1&#xff0c;\u5f53\u5ba2\u6237\u7aef\u653e\u9001FIN&#xff0c;\u5e76\u53d7\u5230ACK\u4e4b\u540e&#xff0c;\u6b64\u65f6\u5c31\u5173\u95ed\u4e86\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u53d1\u6d88\u606f\u7684\u901a\u9053\u3002\u4f46\u662f\u670d\u52a1\u7aef\u5411\u5ba2\u6237\u7aef\u53d1\u6d88\u606f\u7684\u901a\u9053\u8fd8\u6253\u5f00\u7740\u5462&#xff0c;\u6240\u4ee5\u5ba2\u6237\u7aef\u53d1\u9001FIN&#xff0c;\u6536\u5230ACK\u4e4b\u540e&#xff0c;\u5168\u53cc\u5de5\u901a\u9053\u5c31\u5173\u95ed\u4e86\u3002 \u4e3a\u4ec0\u4e48\u662f\u56db\u6b21\u6325\u624b\u5462&#xff1f;\u56e0\u4e3a\u56db\u6b21\u6325\u624b\u662f\u4ee5\u6700\u5c0f\u6210\u672c\u7684\u65b9\u5f0f\u4e89\u5f97\u4e86\u901a\u4fe1\u53cc\u65b9\u7684\u540c\u610f\u3002<\/p>\n<h4>\u91cd\u8c08\u4e09\u6b21\u63e1\u624b<\/h4>\n<p>\u4f60\u4f1a\u53d1\u73b0\u6211\u4eec\u4e4b\u524d\u8bf4\u7684\u4e09\u6b21\u63e1\u624b\u4e2d\u95f4\u6709\u4e2a\u634e\u5e26\u5e94\u7b54&#xff0c;SYN&#043;ACK\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b7595dd16.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u56fe&#xff0c;\u6240\u4ee5\u4e09\u6b21\u63e1\u624b\u7684\u672c\u8d28\u662f\u56db\u6b21\u63e1\u624b&#xff0c;\u53ef\u662f\u5b83\u4e3a\u4ec0\u4e48\u8981\u53eb\u4e09\u6b21\u63e1\u624b\u5462&#xff1f; 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decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b7597af2c.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u5982\u4e0atcp\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5\u7684\u65f6\u5019&#xff0c;\u5728\u5ba2\u6237\u7aef\u89d2\u5ea6&#xff0c;\u53ea\u8981\u7b2c\u4e09\u6b21\u63e1\u624b\u7684ACK\u4e00\u53d1\u51fa\u53bb&#xff0c;\u5b83\u5c31\u7acb\u5373\u8ba4\u4e3a\u5efa\u7acb\u597d\u4e86tcp\u8fde\u63a5\u3002\u4f46\u670d\u52a1\u7aef\u662f\u8981\u6536\u5230\u7b2c\u4e09\u6b21\u63e1\u624b\u4fe1\u606f\u65f6\u624d\u8ba4\u4e3atcp\u8fde\u63a5\u5efa\u7acb\u5b8c\u6210\u3002\u4f46\u5ba2\u6237\u7aef\u8ba4\u4e3a\u5efa\u7acb\u8fde\u63a5\u4e4b\u540e\u5c31\u8981\u5f00\u59cb\u53d1\u6d88\u606f\u4e86\u3002 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Data&#xff09;\u7684\u6982\u5ff5&#xff0c;URG\u548c\u7d27\u6025\u6307\u9488\u5c31\u662f\u5b9e\u73b0\u5b83\u7684\u673a\u5236\u3002\u5b83\u5141\u8bb8\u53d1\u9001\u65b9\u5728\u6b63\u5e38\u6570\u636e\u6d41\u4e2d\u63d2\u5165\u4e00\u4e2a\u7d27\u6025\u4fe1\u53f7\u3002\u5728recv\u8bfb\u53d6\u63a5\u53e3\u4e2d\u6709\u4e00\u4e2aflags\u53c2\u6570&#xff0c;\u5b83\u6709\u4e00\u4e2a\u8fd9\u6837\u7684\u6807\u5fd7\u4f4dMSG_OOB&#xff1a; <img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b759c471f.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> recv\u53ef\u4ee5\u901a\u8fc7\u8fd9\u4e2aMSG_OOB\u6807\u5fd7\u4f4d\u8bfb\u53d6\u7d27\u6025\u6570\u636e\u3002<\/p>\n<p>\u7d27\u6025\u6307\u9488\u4e3b\u8981\u7528\u4e8e\u5728\u4f20\u7edf\u4ea4\u4e92\u5f0f\u534f\u8bae&#xff08;\u5982\u8fdc\u7a0b\u767b\u5f55\u65f6\u6309\u4e0bCtrl&#043;C\u4e2d\u65ad\u547d\u4ee4\u3001FTP\u4f20\u8f93\u5927\u6587\u4ef6\u65f6\u53d6\u6d88\u4f20\u8f93&#xff09;\u4e2d\u53d1\u9001\u201c\u7acb\u5373\u4e2d\u6b62\u201d\u6216\u201c\u4e2d\u65ad\u201d\u7b49\u63a7\u5236\u4fe1\u53f7\u7684\u573a\u666f\u3002<\/p>\n<h3>1.5 \u8fde\u63a5\u7ba1\u7406\u673a\u5236<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/08\/20260808045801-6a76b759d70c4.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u56fe&#xff0c;\u4e0a\u9762\u7684\u6240\u6709\u7684\u901a\u4fe1\u8fc7\u7a0b\u662f\u53cc\u65b9\u7684TCP\u534f\u8bae\u81ea\u4e3b\u63a7\u5236\u7684&#xff0c;\u6700\u591a\u53cc\u65b9\u5e94\u7528\u5c42\u53ea\u662f\u53d1\u8d77\u6216\u8005\u53c2\u4e0e\u4e00\u90e8\u5206\u3002\u4f8b\u5982\u5efa\u7acb\u8fde\u63a5\u65f6&#xff0c;\u5ba2\u6237\u7aef\u8c03\u7528connect\u53ea\u8d1f\u8d23\u53d1\u8d77\u5efa\u7acb\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u5efa\u7acb\u8fde\u63a5\u7684\u5de5\u4f5c\u662fTCP\u534f\u8bae\u81ea\u5df1\u505a\u7684\u3002\u670d\u52a1\u7aef\u8c03\u7528accept\u63a5\u6536\u8fde\u63a5\u65f6\u83b7\u53d6TCP\u534f\u8bae\u5df2\u7ecf\u5efa\u7acb\u597d\u7684\u8fde\u63a5&#xff0c;\u5b83\u53ea\u8d1f\u8d23\u83b7\u53d6\u8fde\u63a5\u5de5\u4f5c\u3002<\/p>\n<p>\u5728TCP\u7684\u56db\u6b21\u6325\u624b\u7684\u8fc7\u7a0b\u4e2d&#xff0c;\u53cc\u65b9\u90fd\u6709\u53ef\u80fd\u662f\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u7684\u4e00\u65b9\u3002\u4e00\u65b9\u65ad\u5f00\u8fde\u63a5\u7684\u672c\u8d28\u662f\u201c\u6211\u4e0d\u7ed9\u4f60\u53d1\u6d88\u606f\u4e86\u201d&#xff0c;\u4e5f\u5c31\u662f\u4e00\u65b9\u4e0d\u5199\u6570\u636e\u4e86\u3002\u4f46\u662f\u4e0d\u5199\u6570\u636e&#xff0c;\u4e0d\u4ee3\u8868\u5b83\u4e0d\u80fd\u53d1\u9001TCP\u62a5\u5934\u8fdb\u884c\u5e94\u7b54\u5de5\u4f5c\u3002\u6240\u4ee5\u65ad\u5f00\u8fde\u63a5\u4e0d\u4e00\u5b9a\u662f\u5f7b\u5e95\u91ca\u653e\u8fde\u63a5&#xff0c;\u8fde\u63a5\u7ed3\u6784\u4f53\u8fd8\u5728&#xff0c;\u53ea\u4e0d\u8fc7\u8fde\u63a5\u8bbe\u7f6e\u6210\u4e86\u67d0\u79cd\u72b6\u6001\u3002 \u8fd9\u91cc\u8fd8\u6709\u4e00\u4e2a\u95ee\u9898&#xff0c;\u5c31\u662f\u5e94\u7528\u5c42\u8c03\u7528close\u5c31\u4ee3\u8868\u76f4\u63a5\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u7684\u8bfb\u5199\u7aef\u3002\u800c\u4e00\u7aef\u65ad\u5f00\u8fde\u63a5\u4e4b\u540e&#xff0c;\u53e6\u4e00\u7aef\u8fd8\u53ef\u4ee5\u7ed9\u5b83\u53d1\u9001\u6570\u636e\u5440\u3002 \u53ef\u662f\u8bfb\u7aef\u4e0d\u662f\u88abclose\u5173\u95ed\u4e86\u5417&#xff1f;\u4e8b\u5b9e\u4e0a&#xff0c;\u4e00\u7aef\u5173\u95ed\u8fde\u63a5\u4e00\u7aef\u4fdd\u7559\u8fde\u63a5\u7684\u8fd9\u79cd\u534a\u5173\u95ed\u72b6\u6001(\u534a\u53cc\u5de5)\u5f88\u5c11\u89c1&#xff0c;\u7edd\u5927\u6570\u6839\u672c\u7528\u4e0d\u5230\u534a\u5173\u95ed\u72b6\u6001\u3002\u6240\u4ee5\u4e3a\u4e86\u80fd\u591f\u8ba9\u672c\u7aef\u5173\u95ed\u8fde\u63a5\u4e4b\u540e\u4f9d\u65e7\u53ef\u4ee5\u8bfb\u53d6\u5bf9\u7aef\u53d1\u9001\u6765\u7684\u6570\u636e&#xff0c;\u5c31\u5fc5\u987b\u6709\u4e00\u4e2a\u53ef\u4ee5\u5c40\u90e8\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u7684\u7cfb\u7edf\u8c03\u7528&#xff0c;\u5b83\u5c31\u662fshutdown\u3002\u8fd9\u4e2a\u7cfb\u7edf\u8c03\u7528\u53ef\u4ee5\u9009\u62e9\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u7aef\u6216\u8005\u5199\u7aef\u6216\u8005\u4e24\u7aef\u90fd\u5173\u95ed\u3002 <img decoding=\"async\" src=\"2026-08-08tmllqs1cd24.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u56e0\u6b64\u901a\u8fc7\u8fd9\u4e2a\u7cfb\u7edf\u8c03\u7528\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e8e\u201c\u6211\u8981\u7ed3\u675f\u53d1\u9001\u3001\u4f46\u8fd8\u60f3\u7ee7\u7eed\u63a5\u6536\u5bf9\u7aef\u540e\u7eed\u6570\u636e\u201d\u7684\u573a\u666f\u3002 \u800c\u5728\u5e73\u65f6close\u5c31\u8986\u76d6\u4e86\u6240\u6709\u9700\u6c42\u3002close() \u7acb\u5373\u91ca\u653e fd\u3001\u65ad\u5f00\u6240\u6709\u5173\u8054&#xff0c;\u4e0d\u5bb9\u6613\u6cc4\u6f0f\u8d44\u6e90&#xff1b;shutdown(SHUT_WR) \u4e4b\u540e\u4f60\u8fd8\u5f97\u8bb0\u5f97\u540e\u7eed\u518d close&#xff0c;\u591a\u4e00\u6b65\u72b6\u6001\u7ba1\u7406&#xff0c;\u7528\u9519\u5bb9\u6613\u6cc4\u6f0f fd\u3002<\/p>\n<hr \/>\n<p>\u4e0b\u9762\u505a\u4e00\u4e9b\u9a8c\u8bc1\u5de5\u4f5c\u3002<\/p>\n<li>\u9a8c\u8bc1\u670d\u52a1\u7aef\u53ea\u9700\u8981\u521b\u5efa\u76d1\u542c\u5957\u63a5\u5b57listen_sockfd\u4e4b\u540e&#xff0c;\u4e0d\u9700\u8981accept\u83b7\u53d6\u8fde\u63a5\u5c31\u53ef\u4ee5\u548c\u5ba2\u6237\u7aef\u5efa\u7acb\u8fde\u63a5\u3002<\/li>\n<p>\u6211\u628a\u4e4b\u524d\u670d\u52a1\u5668\u7684accept\u83b7\u53d6\u8fde\u63a5\u7b49\u7684\u5de5\u4f5c\u5168\u90e8\u6ce8\u91ca\u6389\u4e86&#xff0c;\u63a5\u4e0b\u6765\u7f16\u8bd1\u6d4b\u8bd5&#xff1a; <img decoding=\"async\" src=\"2026-08-08ybyczn2xejv.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u56fe&#xff0c;\u5373\u4f7f\u670d\u52a1\u7aef\u6ca1\u6709accept\u83b7\u53d6\u8fde\u63a5&#xff0c;\u5ba2\u6237\u7aef\u4f9d\u65e7\u548c\u670d\u52a1\u7aef\u5efa\u7acb\u4e86\u8fde\u63a5\u3002\u6240\u4ee5\u5efa\u7acb\u8fde\u63a5\u7684\u5de5\u4f5c\u662fTCP\u534f\u8bae\u81ea\u5df1\u505a\u7684\u3002\u6240\u4ee5\u6ca1\u6709accept&#xff0c;\u8fde\u63a5\u4f9d\u65e7\u80fd\u591f\u5efa\u7acb\u6210\u529f\u3002<\/p>\n<li>\u5173\u4e8elisten\u51fd\u6570\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u95ee\u9898\u3002<\/li>\n<p><img decoding=\"async\" src=\"2026-08-08r4lkzdt4kkh.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> <img decoding=\"async\" src=\"2026-08-08w31mh3r2tgd.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> backlog\u662f\u201c\u5df2\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u3001\u4f46\u8fd8\u672a\u88ab accept \u53d6\u8d70\u201d\u7684\u8fde\u63a5\u961f\u5217\u7684\u6700\u5927\u957f\u5ea6\u3002<\/p>\n<p>\u63a5\u4e0b\u6765&#xff0c;\u6211\u628a\u4ee3\u7801\u4e2d\u7684listen\u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e3a1&#xff0c;\u6211\u4eec\u518d\u6b21\u8fdb\u884c\u6d4b\u8bd5&#xff1a; <img decoding=\"async\" src=\"2026-08-08ddhl21peyt2.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u5f53backlog\u4e3a1\u65f6&#xff0c;\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u7aef\u53d1\u8d77\u4e86\u4e09\u6b21\u5efa\u7acb\u8fde\u63a5\u8bf7\u6c42&#xff0c;\u524d\u4e24\u6b21\u6210\u529f\u4e86&#xff0c;\u7b2c\u4e09\u6b21\u5931\u8d25\u4e86&#xff0c;\u4e00\u76f4\u662fSYN_SENT\u7684\u8bf7\u6c42\u5efa\u7acb\u8fde\u63a5\u72b6\u6001\u3002 \u6240\u4ee5\u63a5\u53d7\u7aef\u7ef4\u6301\u7684\u6682\u65f6\u4e0d\u9700\u8981accept\u5230\u5e94\u7528\u5c42\u7684\u8fde\u63a5\u6570\u91cf\u662f\u6709\u4e0a\u9650\u7684\u3002\u8fd9\u4e2a\u88ab\u63a5\u53d7\u7aef\u7ef4\u6301\u7684\u6ca1\u6709\u88abaccept\u7684\u8fde\u63a5\u961f\u5217\u6211\u4eec\u53eb\u505a\u5168\u8fde\u63a5\u961f\u5217\u3002\u5168\u8fde\u63a5\u961f\u5217\u7684\u4e0a\u9650\u662fbacklog&#043;1\u3002<\/p>\n<p>\u5168\u8fde\u63a5\u961f\u5217\u662f\u5185\u6838\u4e2d\u4e13\u95e8\u5b58\u653e\u5df2\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u3001\u7b49\u5f85\u5e94\u7528\u5c42\u901a\u8fc7 accept() \u53d6\u8d70\u7684\u8fde\u63a5\u961f\u5217\u3002 \u5b83\u7684\u4f5c\u7528&#xff1a; \u89e3\u8026\u63e1\u624b\u4e0e\u5904\u7406&#xff1a;\u8ba9\u5185\u6838\u534f\u8bae\u6808\u81ea\u52a8\u5b8c\u6210\u4e09\u6b21\u63e1\u624b&#xff0c;\u800c\u5e94\u7528\u5c42\u53ef\u4ee5\u6162\u60a0\u60a0\u5730 accept&#xff0c;\u4e24\u8005\u4e92\u4e0d\u963b\u585e\u3002\u63e1\u624b\u662f\u5185\u6838\u7684\u786c\u4ef6\u7ea7\u64cd\u4f5c&#xff0c;accept \u662f\u5e94\u7528\u5c42\u7684\u53d6\u4ef6\u52a8\u4f5c\u3002 \u7f13\u51b2\u7a81\u53d1\u6d41\u91cf&#xff1a;\u5f53\u77ac\u95f4\u5927\u91cf\u5ba2\u6237\u7aef\u540c\u65f6\u5b8c\u6210\u63e1\u624b&#xff0c;\u4f46\u670d\u52a1\u5668\u4e3b\u7ebf\u7a0b\u6b63\u5728\u5904\u7406\u5176\u4ed6\u4e1a\u52a1\u6765\u4e0d\u53ca accept \u65f6&#xff0c;\u8fd9\u4e9b\u8fde\u63a5\u53ef\u4ee5\u6682\u5b58\u5728\u961f\u5217\u4e2d&#xff0c;\u907f\u514d\u8fde\u63a5\u76f4\u63a5\u88ab\u4e22\u5f03\u3002<\/p>\n<p>\u6ce8\u610f&#xff1a;backlog \u4e0d\u662f\u8d8a\u5927\u8d8a\u597d&#xff0c;\u8bbe\u592a\u5927\u53ea\u662f\u628a\u95ee\u9898\u5f80\u540e\u63a8&#xff0c;\u5185\u6838\u5185\u5b58\u4f1a\u5148\u6491\u4e0d\u4f4f\u3002\u9ad8\u5e76\u53d1\u573a\u666f\u901a\u5e38\u8bbe\u4e3a 1024 \u6216 2048&#xff0c;\u5e76\u914d\u5408\u72ec\u7acb\u7684 accept \u7ebf\u7a0b\u53ca\u65f6\u53d6\u8d70\u8fde\u63a5&#xff0c;\u4fdd\u8bc1\u961f\u5217\u4e0d\u79ef\u538b\u3002<\/p>\n<hr \/>\n<p>\u5173\u4e8eTCP\u56db\u6b21\u6325\u624b\u8fc7\u7a0b\u4e2d\u7684\u51e0\u79cd\u8fde\u63a5\u72b6\u6001\u3002 <img decoding=\"async\" src=\"2026-08-085movspcrkin.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4e3b\u52a8\u5173\u95ed\u65b9\u89c6\u89d2&#xff1a;<\/p>\n<table>\n<tr>\u72b6\u6001\u89e6\u53d1\u52a8\u4f5c\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">FIN_WAIT_1<\/td>\n<td align=\"left\">\u5ba2\u6237\u7aef\u8c03\u7528 close()&#xff0c;\u53d1\u9001\u7b2c\u4e00\u4e2a FIN<\/td>\n<td align=\"left\">\u5ba2\u6237\u7aef\u8868\u793a&#034;\u6211\u4e0d\u60f3\u518d\u53d1\u6570\u636e\u4e86&#034;&#xff0c;\u7b49\u5f85\u670d\u52a1\u7aef\u786e\u8ba4<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">FIN_WAIT_2<\/td>\n<td align=\"left\">\u670d\u52a1\u7aef\u56de\u590d ACK&#xff08;\u7b2c\u4e8c\u6b21\u6325\u624b&#xff09;<\/td>\n<td align=\"left\">\u5ba2\u6237\u7aef\u6536\u5230\u786e\u8ba4&#xff0c;\u77e5\u9053\u81ea\u5df1\u7684 FIN \u88ab\u6536\u5230&#xff0c;\u7b49\u5f85\u670d\u52a1\u7aef\u4e3b\u52a8\u53d1 FIN<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">TIME_WAIT<\/td>\n<td align=\"left\">\u670d\u52a1\u7aef\u53d1\u9001 FIN&#xff08;\u7b2c\u4e09\u6b21\u6325\u624b&#xff09;\u2192 \u5ba2\u6237\u7aef\u56de\u590d\u6700\u540e\u4e00\u4e2a ACK&#xff08;\u7b2c\u56db\u6b21\u6325\u624b&#xff09;<\/td>\n<td align=\"left\">\u5ba2\u6237\u7aef\u8fdb\u5165\u7b49\u5f85\u671f&#xff0c;\u6301\u7eed 2MSL&#xff08;\u62a5\u6587\u6700\u5927\u751f\u5b58\u65f6\u95f4&#xff0c;\u901a\u5e38 60 \u79d2&#xff09;<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u88ab\u52a8\u5173\u95ed\u65b9\u89c6\u89d2&#xff1a;<\/p>\n<table>\n<tr>\u72b6\u6001\u89e6\u53d1\u52a8\u4f5c\u542b\u4e49<\/tr>\n<tbody>\n<tr>\n<td align=\"left\">CLOSE_WAIT<\/td>\n<td align=\"left\">\u6536\u5230\u5ba2\u6237\u7aef\u7684 FIN&#xff0c;\u56de\u590d ACK \u540e\u7acb\u5373\u8fdb\u5165<\/td>\n<td align=\"left\">\u670d\u52a1\u7aef\u77e5\u9053\u5ba2\u6237\u7aef\u4e0d\u4f1a\u518d\u53d1\u6570\u636e\u4e86&#xff0c;\u4f46\u81ea\u5df1\u8fd8\u6709\u6570\u636e\u8981\u53d1\u7684\u8bdd\u53ef\u4ee5\u7ee7\u7eed\u53d1&#xff0c;\u53d1\u9001\u5b8c\u6bd5\u540e\u4e3b\u52a8\u8c03\u7528 close()<\/td>\n<\/tr>\n<tr>\n<td align=\"left\">LAST_ACK<\/td>\n<td align=\"left\">\u670d\u52a1\u7aef\u53d1\u9001\u81ea\u5df1\u7684 FIN \u540e<\/td>\n<td align=\"left\">\u7b49\u5f85\u5ba2\u6237\u7aef\u5bf9 FIN \u7684\u6700\u540e\u4e00\u4e2a ACK \u786e\u8ba4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u6211\u60f3\u8981\u770b\u5230\u8fd9\u51e0\u79cd\u72b6\u6001\u7684\u53d8\u5316\u8fc7\u7a0b&#xff0c;\u6240\u4ee5\u6211\u5728\u670d\u52a1\u7aef\u7684\u63a5\u53e3\u4e2d\u505a\u4e86\u5982\u4e0b\u8c03\u6574&#xff1a;<\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">Loop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span>SIGCHLD<span class=\"token punctuation\">,<\/span> SIG_IGN<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e0d\u9700\u8981\u56de\u6536\u5b50\u8fdb\u7a0b<\/span><br \/>\n    <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span><span class=\"token boolean\">true<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u83b7\u53d6\u8fde\u63a5<\/span><br \/>\n        InetAddr clientaddr<span class=\"token punctuation\">;<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>shared_ptr<span class=\"token operator\">&lt;<\/span>Socket<span class=\"token operator\">&gt;<\/span> sockfd <span class=\"token operator\">&#061;<\/span> _listen_sockfd<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Accepter<\/span><span class=\"token punctuation\">(<\/span>clientaddr<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span><span class=\"token punctuation\">(<\/span>sockfd <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">nullptr<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token keyword\">continue<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token function\">LOG<\/span><span class=\"token punctuation\">(<\/span>LogLevel<span class=\"token double-colon punctuation\">::<\/span>DEBUG<span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;accept a new link, address: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> clientaddr<span class=\"token punctuation\">.<\/span><span class=\"token function\">ToString<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;, sockfd: &#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> sockfd<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Sockfd<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p>        <span class=\"token comment\">\/\/ \/\/ \u5904\u7406\u65b0\u7684 sockfd<\/span><br \/>\n        <span class=\"token comment\">\/\/ if(fork() &#061;&#061; 0)<\/span><br \/>\n        <span class=\"token comment\">\/\/ {<\/span><br \/>\n        <span class=\"token comment\">\/\/     \/\/ \u5b50\u8fdb\u7a0b<\/span><br \/>\n        <span class=\"token comment\">\/\/     service(sockfd, clientaddr);<\/span><br \/>\n        <span class=\"token comment\">\/\/     sockfd-&gt;Close(); \/\/ \u670d\u52a1\u5b8c\u6bd5&#xff0c;\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span><br \/>\n        <span class=\"token comment\">\/\/     exit(0);<\/span><br \/>\n        <span class=\"token comment\">\/\/ }<\/span><\/p>\n<p>        <span class=\"token keyword\">int<\/span> cnt <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">15<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">while<\/span><span class=\"token punctuation\">(<\/span>cnt<span class=\"token operator\">&#8212;<\/span><span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;server wait&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> cnt <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n        sockfd<span class=\"token operator\">-&gt;<\/span><span class=\"token function\">Close<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u670d\u52a1\u7aef\u5173\u95ed\u8fde\u63a5<\/span><br \/>\n        std<span class=\"token double-colon punctuation\">::<\/span>cout <span class=\"token operator\">&lt;&lt;<\/span> <span class=\"token string\">&#034;server close&#034;<\/span> <span class=\"token operator\">&lt;&lt;<\/span> std<span class=\"token double-colon punctuation\">::<\/span>endl<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5982\u4e0a&#xff0c;\u6536\u5230\u8fde\u63a5\u4e4b\u540e&#xff0c;\u4e0d\u5bf9\u8fde\u63a5\u8fdb\u884c\u5904\u7406&#xff0c;\u7b49\u5f8515\u79d2\u540e\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n<p>\u5728\u6d4b\u8bd5\u7684\u65f6\u5019&#xff0c;\u6211\u4eec\u8ba9\u5ba2\u6237\u7aef\u5148\u5173\u95ed\u8fde\u63a5&#xff0c;\u670d\u52a1\u7aef\u7b49\u5f8515\u79d2\u4e4b\u540e\u518d\u5173\u95ed\u8fde\u63a5\u3002 <img decoding=\"async\" src=\"2026-08-08dh2wcd1b1u0.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u5f53\u5ba2\u6237\u7aef\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u4e4b\u540e&#xff0c;\u670d\u52a1\u7aef\u4f1a\u5bf9FIN\u8fdb\u884c\u5e94\u7b54&#xff0c;\u5ba2\u6237\u7aef\u6536\u5230\u5e94\u7b54\u4e4b\u540e&#xff0c;\u72b6\u6001\u4f1a\u53d8\u6210FIN_WAIT_2&#xff0c;\u670d\u52a1\u7aef\u72b6\u6001\u53d8\u6210CLOSE_WAIT\u3002\u5982\u679c\u670d\u52a1\u7aef\u4e0d\u8c03\u7528close(fd)&#xff0c;\u8fd9\u79cd\u72b6\u6001\u5c31\u4f1a\u7ef4\u6301\u4f4f\u3002\u6240\u4ee5\u5982\u679c\u4f60\u7684\u670d\u52a1\u5668\u7aef\u51fa\u73b0\u4e86\u5927\u91cf\u7684CLOSE_WAIT&#xff0c;\u90a3\u4e48\u6b64\u65f6\u4f60\u7684\u670d\u52a1\u5668\u53ef\u80fd\u5c31\u5b58\u5728bug\u4e86&#xff0c;\u4ed6\u53ef\u80fd\u6ca1\u6709\u53ca\u65f6\u5173\u95ed\u6587\u4ef6\u63cf\u8ff0\u7b26fd\u3002 \u5f53\u670d\u52a1\u7aef\u8c03\u7528close(fd)\u4e4b\u540e&#xff0c;\u5ba2\u6237\u7aef\u4f1a\u6536\u5230\u670d\u52a1\u7aef\u7684FIN\u8bf7\u6c42&#xff0c;\u6b64\u65f6\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u72b6\u6001\u5c31\u4f1a\u53d8\u6210TIME_WAIT&#xff0c;\u800c\u670d\u52a1\u7aef\u7684\u8fde\u63a5\u72b6\u6001\u53d8\u6210\u4e86CLOSED&#xff0c;\u5df2\u7ecf\u67e5\u4e0d\u5230\u8fde\u63a5\u4e86\u3002<\/p>\n<p>\u56e0\u6b64\u56db\u6b21\u6325\u624b\u4e4b\u540e&#xff0c;\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u7684\u4e00\u65b9\u4f1a\u8fdb\u5165TIME_WAIT\u72b6\u6001&#xff0c;\u88ab\u52a8\u65ad\u5f00\u8fde\u63a5\u7684\u4e00\u65b9\u4f1a\u7acb\u5373\u91ca\u653e\u8fde\u63a5\u3002\u8fdb\u5165TIME_WAIT\u7684\u4e00\u65b9&#xff0c;\u5b83\u7684\u8fde\u63a5\u5e76\u6ca1\u6709\u91ca\u653e&#xff0c;\u6240\u4ee5\u5b83\u7684ip\u3001port\u8fd8\u662f\u88ab\u5360\u7528\u7684\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u670d\u52a1\u7aef\u4e3b\u52a8\u65ad\u5f00\u8fde\u63a5\u4e4b\u540e&#xff0c;\u7acb\u5373\u518d\u6b21\u91cd\u542f&#xff0c;\u7aef\u53e3\u53f7\u7ed1\u5b9a\u5931\u8d25\u7684\u539f\u56e0&#xff01;\u56e0\u4e3a\u5e95\u5c42\u7684\u8fde\u63a5\u8fd8\u662fTIME_WAIT\u72b6\u6001&#xff0c;\u7aef\u53e3\u8fd8\u662f\u88ab\u5360\u7528\u7684&#xff0c;\u6240\u4ee5\u624d\u9700\u8981\u901a\u8fc7setsockopt\u51fd\u6570\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\u3002\u8bbe\u7f6e\u7aef\u53e3\u590d\u7528\u4e4b\u540e&#xff0c;\u65e0\u8bba\u7aef\u53e3\u662f\u5426\u88ab\u5360\u7528&#xff0c;\u5c31\u90fd\u53ef\u4ee5\u4f7f\u7528\u8be5\u7aef\u53e3\u4e86\u3002<\/p>\n<p>\u6b64\u5916&#xff0c;TCP\u534f\u8bae\u89c4\u5b9a&#xff0c;\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u7684\u4e00\u65b9\u8981\u5904\u4e8eTIME_WAIT\u72b6\u6001&#xff0c;\u7b49\u5f85\u4e24\u4e2aMSL&#xff08;maximum segment lifetime&#xff09;\u7684\u65f6\u95f4\u540e\u624d\u80fd\u56de\u5230CLOSED\u72b6\u6001\u3002 MSL \u662f Maximum Segment Lifetime&#xff08;\u6700\u5927\u62a5\u6587\u751f\u5b58\u65f6\u95f4&#xff09;\u7684\u7f29\u5199\u3002\u5b83\u6307\u7684\u662fTCP \u62a5\u6587\u6bb5\u5728\u7f51\u7edc\u4e2d\u53ef\u4ee5\u5b58\u5728\u7684\u6700\u5927\u65f6\u95f4&#xff0c;\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4&#xff0c;\u62a5\u6587\u5c31\u4f1a\u88ab\u7f51\u7edc\u4e22\u5f03\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48TMIE_WAIT\u8981\u7b49\u5f852\u500d\u7684MSL\u65f6\u95f4&#xff1f; \u539f\u56e0\u4e00&#xff1a;\u786e\u4fdd\u53cc\u65b9\u56db\u6b21\u6325\u624b\u90fd\u5c3d\u53ef\u80fd\u5b8c\u6210\u3002\u56db\u6b21\u6325\u624b\u4e2d&#xff0c;\u4e3b\u52a8\u5173\u95ed\u65b9\u53d1\u9001\u6700\u540e\u4e00\u4e2a ACK \u540e\u8fdb\u5165 TIME_WAIT\u3002\u8fd9\u4e2a ACK \u6709\u53ef\u80fd\u5728\u7f51\u7edc\u4e2d\u4e22\u5931\u3002\u5982\u679c\u4e22\u5931&#xff0c;\u88ab\u52a8\u5173\u95ed\u65b9&#xff08;\u670d\u52a1\u7aef&#xff09;\u4f1a\u56e0\u4e3a\u6536\u4e0d\u5230 ACK \u800c\u8d85\u65f6&#xff0c;\u91cd\u53d1\u5b83\u7684 FIN&#xff08;\u7b2c\u4e09\u6b21\u6325\u624b&#xff09;\u3002TIME_WAIT \u72b6\u6001\u5fc5\u987b\u6301\u7eed\u8db3\u591f\u957f&#xff0c;\u4ee5\u4fbf\u80fd\u6536\u5230\u5bf9\u65b9\u91cd\u53d1\u7684 FIN&#xff0c;\u5e76\u518d\u6b21\u56de\u590d ACK\u30022MSL \u6b63\u597d\u8986\u76d6&#xff1a;\u91cd\u53d1 FIN \u5230\u8fbe\u7684\u6700\u957f\u65f6\u95f4&#xff08;1 MSL&#xff09;&#043; \u4e3b\u52a8\u5173\u95ed\u65b9\u56de\u590d ACK \u5230\u8fbe\u7684\u6700\u957f\u65f6\u95f4&#xff08;1 MSL&#xff09;&#061; 2MSL\u3002\u5982\u679c TIME_WAIT \u592a\u77ed&#xff0c;\u6536\u4e0d\u5230\u91cd\u53d1\u7684 FIN&#xff0c;\u88ab\u52a8\u5173\u95ed\u65b9\u4f1a\u4e00\u76f4\u91cd\u53d1 FIN&#xff0c;\u6700\u7ec8\u56e0\u6536\u4e0d\u5230 ACK \u800c\u5f02\u5e38\u5173\u95ed\u3002 \u539f\u56e0\u4e8c&#xff1a;\u8ba9\u9648\u65e7\u62a5\u6587\u5728\u7f51\u7edc\u4e2d\u5c3d\u53ef\u80fd\u6d88\u6563\u3002\u7f51\u7edc\u5ef6\u8fdf\u65e0\u6cd5\u9884\u6d4b&#xff0c;\u4e00\u4e2a\u65e7\u8fde\u63a5\u7684\u6570\u636e\u5305\u53ef\u80fd\u56e0\u4e3a\u8def\u7531\u73af\u8def\u3001\u62e5\u585e\u7b49\u539f\u56e0&#xff0c;\u5728\u53d1\u9001\u540e\u5f88\u4e45&#xff08;\u4f46\u5c0f\u4e8e MSL&#xff09;\u624d\u5230\u8fbe\u3002\u5982\u679c\u6ca1\u6709 TIME_WAIT \u7684\u51b7\u5374\u671f&#xff0c;\u65e7\u8fde\u63a5\u5173\u95ed\u540e\u7acb\u5373\u91cd\u7528\u76f8\u540c\u7684 IP &#043; \u7aef\u53e3\u7ec4\u5408\u5efa\u7acb\u65b0\u8fde\u63a5\u3002\u8fd9\u4e2a\u8fdf\u5230\u7684\u65e7\u6570\u636e\u5305\u5230\u8fbe\u65f6&#xff0c;\u4f1a\u88ab\u65b0\u8fde\u63a5\u8bef\u8ba4\u4e3a\u662f\u6709\u6548\u6570\u636e&#xff0c;\u9020\u6210\u6570\u636e\u6df7\u4e71\u6216\u5b89\u5168\u6f0f\u6d1e\u3002\u7b49\u5f85 2MSL \u540e&#xff0c;\u65e7\u8fde\u63a5\u7684\u6240\u6709\u62a5\u6587\u90fd\u5df2\u5728\u7f51\u7edc\u4e2d\u6d88\u5931\u3002<\/p>\n<h3>1.6 \u518d\u8c08\u6d41\u91cf\u63a7\u5236<\/h3>\n<p><img decoding=\"async\" src=\"2026-08-083hr45gyjx2d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5728\u4e4b\u524d\u5df2\u7ecf\u8c08\u8fc7\u6d41\u91cf\u63a7\u5236\u4e86&#xff0c;\u8fd9\u91cc\u89e3\u51b3\u4e00\u4e2a\u95ee\u9898&#xff1a; \u5f53TCP\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5\u4e4b\u540e&#xff0c;\u7b2c\u4e00\u6b21\u53d1\u9001\u6570\u636e\u65f6&#xff0c;\u5e94\u8be5\u53d1\u9001\u591a\u5927\u7684\u6570\u636e\u5440&#xff1f;<\/p>\n<p>\u867d\u7136\u6b64\u65f6\u6211\u4eec\u65f6\u7b2c\u4e00\u6b21\u53d1\u9001\u643a\u5e26\u6570\u636e\u7684\u62a5\u6587&#xff0c;\u4f46\u8fd9\u4e0d\u662f\u6211\u4eec\u7b2c\u4e00\u6b21\u53d1\u9001\u62a5\u6587&#xff01;\u6211\u4eec\u5728TCP\u4e09\u6b21\u63e1\u624b\u7684\u65f6\u5019\u5c31\u4ea4\u6362\u8fc7\u62a5\u5934&#xff0c;\u4e5f\u5c31\u662f\u4ea4\u6362\u8fc7\u7a97\u53e3\u7684\u5927\u5c0f\u4e86\u3002\u6240\u4ee5\u53d1\u9001\u591a\u5927\u7684\u6570\u636e\u81ea\u7136\u4e5f\u5c31\u4e0d\u7528\u62c5\u5fc3\u4e86\u3002<\/p>\n<p>\u6269\u5145&#xff1a;TCP\u62a5\u5934\u4e2d\u7684\u8868\u793a\u7a97\u53e3\u5927\u5c0f\u5b57\u6bb5\u662f16\u4f4d\u7684&#xff0c;16\u4f4d\u6700\u5927\u8868\u793a65535&#xff0c;\u90a3\u4e48TCP\u7a97\u53e3\u6700\u5927\u5c31\u662f65535\u5b57\u8282\u4e48&#xff1f;\u5b9e\u9645\u4e0a&#xff0c;TCP\u9996\u90e840\u5b57\u8282\u9009\u9879\u4e2d\u8fd8\u5305\u542b\u4e86\u4e00\u4e2a\u7a97\u53e3\u6269\u5927\u56e0\u5b50M&#xff0c;\u5b9e\u9645\u7a97\u53e3\u5927\u5c0f\u662f\u7a97\u53e3\u5b57\u6bb5\u7684\u503c\u5de6\u79fb M \u4f4d\u3002 <img decoding=\"async\" src=\"2026-08-08fhv5dmczchq.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<h3>1.7 \u5173\u4e8e\u6ed1\u52a8\u7a97\u53e3<\/h3>\n<p>\u9996\u5148TCP\u7684\u53d1\u9001\u7f13\u51b2\u533a&#xff0c;\u63a5\u53d7\u7f13\u51b2\u533a\u4f60\u53ef\u4ee5\u628a\u5b83\u5f53\u4f5c\u6570\u7ec4\u6765\u770b\u5f85\u3002<\/p>\n<p>\u6ed1\u52a8\u7a97\u53e3\u662f\u4ec0\u4e48\u5462&#xff1f;\u5728\u903b\u8f91\u4e0a&#xff0c;\u4f60\u53ef\u4ee5\u8ba4\u4e3a\u6ed1\u52a8\u7a97\u53e3\u662f\u53d1\u9001\u7f13\u51b2\u533a\u7684\u4e00\u90e8\u5206\u533a\u57df\u3002\u903b\u8f91\u4e0a\u5c06\u5b83\u5f53\u4f5c\u7ebf\u6027\u7ed3\u6784\u3002 <img decoding=\"async\" src=\"2026-08-08dselmdx3en3.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u6ed1\u52a8\u7a97\u53e3\u6240\u5904\u7684\u533a\u57df\u662f\u53ef\u4ee5\u6682\u65f6\u4e0d\u6536\u5e94\u7b54\u76f4\u63a5\u53d1\u9001\u7684\u533a\u57df&#xff0c;\u53d1\u9001\u5b8c\u4e4b\u540e\u7b49\u5f85\u8fd9\u4e00\u6bb5\u533a\u57df\u7684\u5e94\u7b54\u62a5\u6587\u3002\u6ed1\u52a8\u7a97\u53e3\u5de6\u4fa7\u7684\u533a\u57df\u662f\u5df2\u7ecf\u53d1\u9001\u7684\u4e14\u5df2\u7ecf\u7ecf\u8fc7\u786e\u8ba4\u5e94\u7b54\u7684\u6570\u636e\u3002\u6ed1\u52a8\u7a97\u53e3\u7684\u53f3\u4fa7\u662f\u5f85\u53d1\u9001\u6570\u636e\u533a\u57df\u3002<\/p>\n<p>\u6ed1\u52a8\u7a97\u53e3\u533a\u57df\u7684\u5c31\u662f\u53ef\u4ee5\u53d1\u9001\u7684\u4e00\u6279\u62a5\u6587\u3002 <img decoding=\"async\" src=\"2026-08-08i1bl0eu25vv.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u6ed1\u52a8\u7a97\u53e3\u7684\u5de5\u4f5c\u8fc7\u7a0b&#xff1a;<\/p>\n<li>\u6b63\u5e38\u5de5\u4f5c\u8fc7\u7a0b&#xff1a;<\/li>\n<p>\u6700\u5f00\u59cb\u7684\u65f6\u5019&#xff0c;\u5efa\u7acb\u8fde\u63a5\u65f6&#xff0c;\u53cc\u65b9\u5c31\u4e92\u76f8\u4ea4\u6362\u4e86\u7a97\u53e3\u5269\u4f59\u5927\u5c0f&#xff0c;\u6b64\u65f6\u53cc\u65b9\u90fd\u6536\u5230\u4e86\u5bf9\u65b9\u53d1\u7684ACK_WIN\u3002\u6240\u4ee5\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f\u5c31\u53ef\u4ee5\u786e\u5b9a\u4e86start_win&#061;0&#xff0c;end_win&#061;ACK_WIN\u3002\u6240\u4ee5\u6ed1\u52a8\u7a97\u53e3\u7684\u53d1\u9001\u533a\u57df\u5927\u5c0f\u662f\u4ee5\u5bf9\u65b9\u7684\u63a5\u53d7\u80fd\u529b\u786e\u5b9a\u7684\u3002 <img decoding=\"async\" src=\"2026-08-083cecase20ol.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u56fe&#xff0c;\u5047\u8bbestart_win\u662f1001&#xff0c;end_win\u662f5001&#xff0c;\u90a3\u4e48\u6b64\u65f6\u53d1\u9001\u65b9\u5c31\u53ef\u4ee5\u53d1\u90011001-2000\u30012001-3000\u30013001-4000\u30014001-5000\u7684\u6570\u636e\u62a5\u6587&#xff0c;\u7136\u540e\u7b49\u5f85\u53d1\u9001\u65b9\u4f20\u6765\u5e94\u7b54\u62a5\u6587\u3002<\/p>\n<p>\u5bf9\u65b9\u6bcf\u6b21\u5e94\u7b54\u65f6\u90fd\u4f1a\u5e26\u4e0a\u7f13\u51b2\u533a\u7684\u5269\u4f59\u63a5\u53d7\u5927\u5c0f\u3002\u5982\u679c\u5e94\u7b54\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u548c\u4e0a\u6b21\u76f8\u6bd4\u53d8\u5927\u4e86&#xff0c;\u90a3\u4e48\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f\u5c31\u53d8\u5927\u4e86&#xff0c;\u5982\u679c\u548c\u4e0a\u6b21\u7684\u5927\u5c0f\u76f8\u6bd4\u53d8\u5c0f\u4e86&#xff0c;\u90a3\u4e48\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f\u5c31\u53d8\u5c0f\u4e86&#xff0c;\u5982\u679c\u4e0d\u53d8\u90a3\u4e48\u6ed1\u52a8\u7a97\u53e3\u4e0d\u53d8\u3002<\/p>\n<p>\u5982\u679c\u6536\u5230\u5e94\u7b54\u62a5\u65872001&#xff0c;\u90a3\u4e48\u5728\u8c03\u6574\u6ed1\u52a8\u7a97\u53e3\u65f6&#xff0c;start_end\u76f4\u63a5\u8d4b\u503c2001\u5373\u53ef&#xff0c;\u56e0\u4e3a2001\u7684\u610f\u601d\u662f2001\u4e4b\u524d\u7684\u5168\u90e8\u6536\u5230\u4e86&#xff01;end_win&#061;start_win&#043;ACK_WIN\u3002<\/p>\n<p>\u6ed1\u52a8\u7a97\u53e3\u53ef\u80fd\u5411\u5de6\u6ed1\u52a8\u5417&#xff1f;\u4e0d\u53ef\u80fd\u5411\u5de6\u6ed1\u52a8\u3002 \u53d1\u9001\u65b9\u53d1\u9001\u4e86\u4e00\u6279\u62a5\u6587&#xff0c;\u6700\u7cdf\u7cd5\u7684\u60c5\u51b5\u662f\u53d1\u9001\u65b9\u4e00\u4e2a\u5e94\u7b54\u62a5\u6587\u4e5f\u6ca1\u6709\u6536\u5230&#xff0c;\u6b64\u65f6\u5b83\u5c31\u8d85\u65f6\u91cd\u4f20\u8fd9\u4e00\u6279\u62a5\u6587\u3002\u800c\u6ed1\u52a8\u7a97\u53e3\u5de6\u4fa7\u7684\u62a5\u6587\u90fd\u662f\u5df2\u7ecf\u7ecf\u8fc7\u5e94\u7b54\u786e\u8ba4\u8fc7\u7684\u3002\u6240\u4ee5\u6ed1\u52a8\u7a97\u53e3\u6700\u574f\u7684\u60c5\u51b5\u662f\u5de6\u8fb9\u754c\u4e0d\u53d8\u3002\u800c\u6ed1\u52a8\u7a97\u53e3\u7684\u53f3\u8fb9\u754c\u7684\u6d6e\u52a8\u53d8\u5316\u548c\u63a5\u6536\u65b9\u7684\u7f13\u51b2\u533a\u7684\u63a5\u53d7\u80fd\u529b\u6709\u5173\u3002<\/p>\n<li>\u5f02\u5e38\u5de5\u4f5c\u8fc7\u7a0b<\/li>\n<p>\u6700\u5de6\u4fa7\u62a5\u6587\u4e22\u5931&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"2026-08-08vj1rupeqfwz.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a\u662f\u53d1\u751f\u5feb\u91cd\u4f20\u7684\u60c5\u51b5&#xff0c;\u5f53\u53d1\u9001\u65b9\u8fde\u7eed\u6536\u5230\u4e09\u4e2a\u540c\u6837\u7684\u5e94\u7b54\u5e8f\u53f7\u5c31\u7acb\u523b\u8865\u53d1\u8fd9\u6bb5\u62a5\u6587\u3002<\/p>\n<p>\u5feb\u91cd\u4f20\u673a\u5236&#xff1a;\u5f53\u53d1\u9001\u7aef\u8fde\u7eed\u6536\u52303\u4e2a\u5bf9\u540c\u4e00\u4e2a\u4e22\u5931\u62a5\u6587\u6bb5\u7684\u91cd\u590dACK\u65f6&#xff0c;\u7acb\u5373\u91cd\u4f20\u8be5\u62a5\u6587\u6bb5&#xff0c;\u65e0\u9700\u7b49\u5f85\u91cd\u4f20\u8ba1\u65f6\u5668\u8d85\u65f6\u3002\u8d85\u65f6\u91cd\u4f20\u673a\u5236\u662f\u5bf9\u5feb\u91cd\u4f20\u673a\u5236\u7684\u515c\u5e95\u5de5\u4f5c\u3002<\/p>\n<p><img decoding=\"async\" src=\"2026-08-08b1fzmgr4dfi.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> 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src=\"2026-08-08l3aud1ore2g.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/> \u5982\u4e0a&#xff0c;\u5148\u53d1\u90011\u4e2a&#xff0c;\u53ef\u4ee5\u901a\u4fe1&#xff0c;\u5c31\u7ffb\u500d\u589e\u957f&#xff0c;\u8fd9\u5c31\u662f\u6162\u542f\u52a8\u3002\u5b83\u901a\u5e38\u662f\u6307\u6570\u7ea7\u522b\u589e\u957f\u7684&#xff0c;\u4f46\u4e3a\u4ec0\u4e48\u53eb\u6162\u542f\u52a8\u5462&#xff1f;\u56e0\u4e3a\u5b83\u7684\u524d\u671f\u6162&#xff0c;\u542f\u52a8\u6162&#xff0c;\u4f46\u662f\u4e00\u65e6\u7f51\u7edc\u72b6\u6001\u826f\u597d&#xff0c;\u5b83\u7684\u4e2d\u671f\u6062\u590d\u5feb\u3002\u6240\u4ee5\u6162\u542f\u52a8\u5728\u53ef\u9760\u6027\u548c\u6548\u7387\u4e2d\u5bfb\u627e\u4e86\u5e73\u8861\u70b9\u3002 <img decoding=\"async\" src=\"2026-08-08mchaxdpgpcu.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u8fd9\u91cc\u5f15\u5165\u4e00\u4e2a\u62e5\u585e\u7a97\u53e3\u7684\u6982\u5ff5\u3002 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\u662f\u6307\u63a5\u6536\u7aef\u5728\u53d1\u9001\u6570\u636e\u62a5\u6587\u65f6&#xff0c;\u5c06\u539f\u672c\u9700\u8981\u5355\u72ec\u53d1\u9001\u7684ACK\u786e\u8ba4\u4fe1\u606f&#xff0c;\u9644\u5e26\u5728\u6570\u636e\u62a5\u6587\u7684TCP\u5934\u90e8\u4e2d\u4e00\u8d77\u53d1\u9001\u51fa\u53bb&#xff0c;\u4ece\u800c\u7701\u6389\u4e00\u4e2a\u72ec\u7acb\u7684ACK\u5305\u3002<\/p>\n<p>\u5728TCP\u53cc\u65b9\u4e92\u76f8\u53d1\u6d88\u606f\u7684\u573a\u666f\u4e0b&#xff0c;\u634e\u5e26\u5e94\u7b54\u5341\u5206\u5e38\u89c1&#xff0c;\u5b83\u80fd\u591f\u63d0\u9ad8\u62a5\u6587\u53d1\u9001\u7684\u6548\u7387\u3002 \u6b64\u5916\u5728TCP\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5\u7684\u65f6\u5019&#xff0c;\u63d0\u51fa\u5efa\u7acb\u8fde\u63a5\u7684\u4e00\u65b9\u5728\u7b2c\u4e09\u6b21\u63e1\u624b\u53d1\u51fa\u53bb\u7684\u65f6\u5019\u5c31\u8ba4\u4e3a\u5df2\u7ecf\u5efa\u7acb\u597d\u8fde\u63a5\u4e86&#xff0c;\u6240\u4ee5\u7b2c\u4e09\u6b21\u63e1\u624b\u4e5f\u662f\u53ef\u4ee5\u634e\u5e26\u5e94\u7b54\u643a\u5e26\u6570\u636e\u7684\u3002<\/p>\n<h3>1.10 TCP\u5f02\u5e38\u60c5\u51b5<\/h3>\n<p>\u8fdb\u7a0b\u7ec8\u6b62&#xff1a;\u8fdb\u7a0b\u7ec8\u6b62\u4f1a\u91ca\u653e\u6587\u4ef6\u63cf\u8ff0\u7b26&#xff0c;\u4ecd\u7136\u53ef\u4ee5\u53d1\u9001FIN\u3002\u548c\u6b63\u5e38\u5173\u95ed\u6ca1\u6709\u4ec0\u4e48\u533a\u522b\u3002 \u673a\u5668\u91cd\u542f&#xff1a;\u548c\u8fdb\u7a0b\u7ec8\u6b62\u7684\u60c5\u51b5\u76f8\u540c\u3002 \u673a\u5668\u6389\u7535\/\u7f51\u7ebf\u65ad\u5f00&#xff1a;\u63a5\u6536\u7aef\u8ba4\u4e3a\u8fde\u63a5\u8fd8\u5728&#xff0c;\u4e00\u65e6\u63a5\u6536\u7aef\u6709\u5199\u5165\u64cd\u4f5c&#xff0c;\u63a5\u6536\u7aef\u53d1\u73b0\u8fde\u63a5\u5df2\u7ecf\u4e0d\u5728\u4e86&#xff0c;\u5c31\u4f1a\u8fdb\u884cRST(reset)\u3002\u5373\u4f7f\u6ca1\u6709\u5199\u5165\u64cd\u4f5c&#xff0c;TCP\u81ea\u5df1\u4e5f\u5185\u7f6e\u4e86\u4e00\u4e2a\u4fdd\u6d3b\u5b9a\u65f6\u5668&#xff0c;\u4f1a\u5b9a\u671f\u8be2\u95ee\u5bf9\u65b9\u662f\u5426\u8fd8\u5728\u3002\u5982\u679c\u5bf9\u65b9\u4e0d\u5728&#xff0c;\u4e5f\u4f1a\u628a\u8fde\u63a5\u91ca\u653e\u3002 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Timer&#xff09;\u662fTCP\u534f\u8bae\u6808\u5728\u5185\u6838\u5c42\u9762\u63d0\u4f9b\u7684\u5e95\u5c42\u63a2\u6d3b\u673a\u5236&#xff0c;\u9ed8\u8ba4\u5173\u95ed&#xff0c;\u5f00\u542f\u540e\u4f1a\u5728\u8fde\u63a5\u7a7a\u95f2\u8d85\u65f6&#xff08;\u5982Linux\u9ed8\u8ba47200\u79d2&#xff09;\u540e\u53d1\u9001\u63a2\u6d4b\u5305&#xff0c;\u82e5\u591a\u6b21\u65e0\u54cd\u5e94\u5219\u5224\u5b9a\u8fde\u63a5\u6b7b\u4ea1\u5e76\u91ca\u653e\u8d44\u6e90&#xff0c;\u4e3b\u8981\u4f5c\u7528\u662f\u5bf9\u5e94\u7528\u5c42\u672a\u5904\u7406\u5230\u7684\u5f02\u5e38\u8fdb\u884c\u515c\u5e95\u6e05\u7406&#xff0c;\u907f\u514d\u50f5\u5c38\u8fde\u63a5\u8017\u5c3d\u7cfb\u7edf\u8d44\u6e90&#xff1b; 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