{"id":30237,"date":"2026-09-30T14:33:52","date_gmt":"2026-09-30T06:33:52","guid":{"rendered":"https:\/\/aif.amtbbs.org\/?p=30237"},"modified":"2026-09-30T14:38:54","modified_gmt":"2026-09-30T06:38:54","slug":"tcp%e4%b8%ba%e4%bb%80%e4%b9%88%e6%8f%a1%e6%89%8b%e8%a6%81%e4%b8%89%e5%9b%9e%ef%bc%8c%e6%8c%a5%e6%89%8b%e5%9b%9b%e6%ac%a1%ef%bc%9f%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%ba%e7%bb%99%e4%bd%a0%e5%9b%be","status":"publish","type":"post","link":"https:\/\/aif.amtbbs.org\/index.php\/2026\/09\/30\/30237\/","title":{"rendered":"TCP\u4e3a\u4ec0\u4e48\u63e1\u624b\u8981\u4e09\u56de\uff0c\u6325\u624b\u56db\u6b21\uff1f\u6df1\u5165\u6d45\u51fa\u7ed9\u4f60\u56fe\u89e3"},"content":{"rendered":"
TCP\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b\u673a\u5236\uff0c\u90fd\u662f\u4e3a\u4e86\u5728\u4e0d\u53ef\u9760\u7684IP\u7f51\u7edc\u5c42\u4e4b\u4e0a,\u4e0d\u53ef\u9760\u4fe1\u9053\u4e0a\uff0c”\u5c3d\u53ef\u80fd\u5730”\u63d0\u4f9b\u53ef\u9760\u7684\u7aef\u5230\u7aef\u7684\u4f20\u8f93\u670d\u52a1\u3002\u901a\u8fc7\u786e\u8ba4\u673a\u5236\u3001\u5e8f\u5217\u53f7\u3001\u5ef6\u8fdf\u673a\u5236\u548c\u72b6\u6001\u7ba1\u7406\uff0c\u786e\u4fdd\u4e86\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u3001\u6709\u5e8f\u6027\u548c\u8fde\u63a5\u7ba1\u7406\u7684\u6b63\u786e\u6027\u3002<\/div>\n
\n
\n

\u5927\u5bb6\u597d\u5440\uff0c\u6211\u662f\u547c\u565c\u565c\uff0c\u4eca\u5929\u6211\u4eec\u6765\u804a\u804a\u4e00\u4e0bTCP\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b\uff0c\u8fd9\u4e2a\u975e\u5e38\u7ecf\u5178\u7684\u95ee\u9898<\/p>\n

\u6211\u4eec\u5148\u6765\u56de\u987e\u4e00\u4e0b\uff0c\u4ec0\u4e48\u662fTCP\u534f\u8bae\uff1f<\/p>\n

\u4ec0\u4e48\u662fTCP\u534f\u8bae<\/h4>\n

TCP\u534f\u8bae<\/strong>\uff0c\u5168\u540d\u53ebTransmission control protocol<\/code>\uff0c\u5373\u4f20\u8f93\u63a7\u5236\u534f\u8bae<\/strong>\uff0c\u57fa\u4e8eOSI\u4e03\u5c42\u6a21\u578b\u4e2d\u7684\u4f20\u8f93\u5c42<\/code><\/p>\n

\u5b83\u662f\u4e00\u79cd\u63d0\u4f9b\u2faf\u5411\u8fde\u63a5\u7684\u3001\u53ef\u9760\u7684\u3001\u57fa\u4e8e\u5b57\u8282\u6d41\u7684<\/strong>\u7aef\u5230\u7aef\u901a\u4fe1\u670d\u52a1 \u7684\u4f20\u8f93\u534f\u8bae\uff0c\u5b83\u7684\u4f20\u8f93\u5355\u4f4d\u4e3a\u62a5\u2f42\u6bb5segment<\/code><\/p>\n

\u5728\u5982\u4eca\u4e92\u8054\u7f51\u65f6\u4ee3\uff0c\u6211\u4eec\u6bcf\u5929\u5237\u77ed\u89c6\u9891\u3001\u6253\u6e38\u620f\u3001\u548c\u5bb6\u4eba\u6253\u89c6\u9891\u7535\u8bdd\uff0c\u751a\u81f3\u4e8e\u4efb\u4f55\u7f51\u7edc\u7684\u52a8\u4f5c\uff0c\u80fd\u4fdd\u6301\u5982\u6b64\u6d41\u7545\u7684\u4f7f\u7528\u4f53\u9a8c\uff0c\u80cc\u540e\u90fd\u79bb\u4e0d\u5f00TCP\u7684\u9ed8\u9ed8\u5de5\u4f5c<\/code>\u3002<\/p>\n

\u6211\u4eec\u90fd\u77e5\u9053\u4e92\u8054\u7f51\u7684\u5e95\u5c42\uff0c\u5c31\u662f\u4f9d\u6258\u4e8e \u5168\u4e16\u754c\u5404\u4e2a\u5730\u65b9\u5404\u79cd\u578b\u53f7\u7684\u6d77\u91cf\u7684\u7f51\u7edc\u8bbe\u5907\u4e92\u8054\uff0c\u7136\u540e\u73b0\u5b9e\u4e2d\u5b58\u5728\u7535\u78c1\u5e72\u6270\u3001\u4fe1\u53f7\u8870\u51cf\uff0c\u7269\u7406\u7ebf\u8def\u8001\u5316\uff0c\u8def\u7531\u5668\u6545\u969c\u7b49\u5404\u79cd\u5404\u6837\u7684\u95ee\u9898<\/p>\n

\u6240\u4ee5\u4e92\u8054\u7f51\u5929\u751f\u5c31\u662f\u4e0d\u53ef\u9760\u7684<\/strong>!<\/p>\n

\u800cTCP\u5c31\u662f\u8981\u5728\u4e0d\u53ef\u9760\u7684\u4e92\u8054\u7f51\u4e0a\uff0c\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u56db\u6b21\u6325\u624b<\/strong>\u7b49\u4e00\u7cfb\u5217\u673a\u5236\uff0c”\u5c3d\u53ef\u80fd\u5730<\/strong>“\u63d0\u4f9b\u53ef\u9760\u7684<\/strong>\u7aef\u5230\u7aef\u7684\u4f20\u8f93\u670d\u52a1<\/p>\n

TCP\u62a5\u6587\u7684\u9996\u90e8\u683c\u5f0f<\/h4>\n

\u8981\u60f3\u4e86\u89e3\u4e09\u6b21\u63e1\u624b\u56db\u6b21\u6325\u624b<\/code>\u8fd9\u4e00\u975e\u5e38\u7ecf\u5178\u7684\u673a\u5236\uff0c\u6211\u4eec\u5f97\u5148\u4e86\u89e3\u4e00\u4e0bTCP\u62a5\u6587\u7684\u9996\u90e8\u683c\u5f0f\uff0cTCP\u9996\u90e8<\/code>\u662fTCP\u62a5\u6587\u6bb5\u7684\u91cd\u8981\u7ec4\u6210\u90e8\u5206\uff0c\u5b83\u8d1f\u8d23\u5728\u6570\u636e\u4f20\u8f93\u8fc7\u7a0b\u4e2d\u63d0\u4f9b\u5fc5\u8981\u7684\u63a7\u5236\u4fe1\u606f<\/code>\uff0c\u5305\u542b\u4e86\u5efa\u7acb\u8fde\u63a5\u3001\u53ef\u9760\u6570\u636e\u4f20\u8f93\u3001\u6d41\u91cf\u63a7\u5236\u548c\u8fde\u63a5\u7ec8\u6b62\u6240\u9700\u7684\u6240\u6709\u63a7\u5236\u4fe1\u606f\u3002<\/p>\n

\u5176\u957f\u5ea6\u901a\u5e38\u4e3a20\u5b57\u8282<\/code>\uff08\u4e0d\u5305\u542b\u9009\u9879\u5b57\u6bb5\uff09\uff0c\u6700\u5927\u53ef\u8fbe60\u5b57\u8282<\/code>\uff08\u5305\u542b\u9009\u9879\u5b57\u6bb5\uff09<\/p>\n

\"img\"img<\/span><\/p>\n

TCP\u9996\u90e8\u5305\u542b\u4e86\u591a\u4e2a\u5b57\u6bb5\uff0c\u6bcf\u4e2a\u5b57\u6bb5\u90fd\u6709\u5176\u7279\u5b9a\u7684\u529f\u80fd\u548c\u610f\u4e49\uff0c\u5b83\u4eec\u5171\u540c\u786e\u4fdd\u4e86TCP\u8fde\u63a5\u7684\u53ef\u9760\u6027\u548c\u6570\u636e\u7684\u6b63\u786e\u4f20\u8f93\u3002<\/p>\n

    \n
  1. \u6e90\u7aef\u53e3\u53f7(Source Port)\u548c\u76ee\u7684\u7aef\u53e3\u53f7(Destination Port)\uff1a\u5404\u536016\u4f4d\uff0c\u8303\u56f4:0-65535<\/code>\uff0c\u7528\u4e8e\u6807\u8bc6\u53d1\u9001\u548c\u63a5\u6536\u6570\u636e\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/li>\n
  2. \u5e8f\u53f7(Seq)\uff1a\u53604\u5b57\u8282\uff0c\u6807\u8bc6\u6570\u636e\u7684\u987a\u5e8f\uff0c\u4fdd\u8bc1\u4f20\u8f93\u6570\u636e\u7684\u987a\u5e8f\u6027\u548c\u53ef\u9760\u6027\uff08\u7528\u4e8e\u786e\u8ba4\u4e22\u5931\u6216\u4e71\u5e8f\u7684\u62a5\u6587\u6bb5\uff09<\/li>\n
  3. \u786e\u8ba4\u5e8f\u53f7(Ack)\uff1a\u53604\u5b57\u8282\uff0c\u8868\u793a\u63a5\u6536\u65b9\u671f\u671b\u6536\u5230\u7684\u4e0b\u4e00\u4e2a\u5b57\u8282\u7684\u5e8f\u5217\u53f7\uff0c\u7528\u4e8e\u786e\u8ba4\u5df2\u6210\u529f\u63a5\u6536\u7684\u6570\u636e\uff0c\u544a\u8bc9\u53d1\u9001\u65b9\u81ea\u5df1\u63a5\u6536\u5230\u4e86\u54ea\u4e9b\u6570\u636e\u3002<\/li>\n<\/ol>\n

    \u786e\u8ba4\u5e8f\u53f7\u5e94\u5f53\u662f\u4e0a\u6b21\u5df2\u6210\u529f\u6536\u5230\u6570\u636e\u5b57\u8282\u5e8f\u53f7\u52a0 1\u3002\u53ea\u6709 ACK \u6807\u5fd7\u4e3a 1 \u65f6\u786e\u8ba4\u5e8f\u53f7\u5b57\u6bb5\u624d\u6709\u6548\u3002<\/p><\/blockquote>\n

      \n
    1. \u9996\u90e8\u957f\u5ea6(Header Length)\uff1a\u53604\u4f4d\uff0c\u8fd9\u91cc\u66f4\u51c6\u786e\u5730\u8bb2\u662f\u6570\u636e\u504f\u79fb<\/code>\uff0c\u8868\u793aTCP\u9996\u90e8\u957f\u5ea6\uff0c\u56e0\u4e3a\u9996\u90e8\u7684\u957f\u5ea6\u662f\u53ef\u53d8\u7684\uff0c\u4e3b\u8981\u662f\u7531\u4e8e\u9009\u9879\u5b57\u6bb5\u7684\u5b58\u5728\uff1b\u9996\u90e8\u957f\u5ea6 = \u6570\u636e\u504f\u79fb\u503c * 4 \u5b57\u8282<\/code><\/li>\n
    2. \u4fdd\u7559(Reserved)\uff1a\u53606\u4f4d\uff0c\u6682\u672a\u4f7f\u7528\uff0c\u4fdd\u7559\u7528\u4e8e\u672a\u6765\u6269\u5c55<\/li>\n
    3. \u63a7\u5236\u4f4d(Control Bits)\uff1a\u5305\u62ecURG\u3001ACK\u3001PSH\u3001RST\u3001SYN\u548cFIN\u7b49\u6807\u5fd7\uff0c\u7528\u4e8e\u63a7\u5236TCP\u8fde\u63a5\u7684\u72b6\u6001\u548c\u6570\u636e\u4f20\u8f93\u7684\u884c\u4e3a\uff0c\u5fc5\u987b\u8981\u7406\u89e3\u63a7\u5236\u4f4d\uff0c\u5b83\u5c06\u662f\u6211\u4eec\u7406\u89e3TCP\u4e09\u6b21\u63e1\u624b\u7684\u57fa\u7840<\/strong><\/li>\n<\/ol>\n
        \n
      • URG (Urgent Bit)\uff1a\u503c\u4e3a 1 \u65f6\uff0c\u7d27\u6025\u6307\u9488\u751f\u6548<\/li>\n
      • ACK (Acknowledgment Bit)\uff1a\u503c\u4e3a 1 \u65f6\uff0c\u786e\u8ba4\u5e8f\u53f7\u7684\u5b57\u6bb5\u751f\u6548\uff0c\u8868\u793a\u6570\u636e\u4fe1\u606f\u786e\u8ba4\uff0cTCP\u89c4\u5b9a\u9664\u4e86\u6700\u521d\u5efa\u7acb\u8fde\u63a5\u65f6\u7684 SYN \u5305\u4e4b\u5916\u8be5\u4f4d\u5fc5\u987b\u8bbe\u7f6e\u4e3a1<\/li>\n
      • PSH (Push Bit)\uff1a\u63a5\u6536\u65b9\u5e94\u5c3d\u5feb\u5c06\u8fd9\u4e2a\u62a5\u6587\u6bb5\u4ea4\u7ed9\u5e94\u7528\u5c42<\/li>\n
      • RST (Reset Bit)\uff1a\u53d1\u9001\u7aef\u9047\u5230\u95ee\u9898\uff0c\u60f3\u8981\u91cd\u5efa\u8fde\u63a5<\/li>\n
      • SYN (Synchronize Bit)\uff1a\u540c\u6b65\u5e8f\u53f7\uff0c\u503c\u4e3a 1 \u65f6\uff0c\u8868\u793a\u5e0c\u671b\u5efa\u7acb\u8fde\u63a5<\/li>\n
      • FIN (Finish Bit)\uff1a\u503c\u4e3a 1 \u65f6\uff0c\u8868\u793a\u5e0c\u671b\u5173\u95ed\u8fde\u63a5<\/li>\n<\/ul>\n
          \n
        1. \u7a97\u53e3(Window)\uff1a\u53602\u5b57\u8282\uff0c\u7528\u4e8e\u6d41\u91cf\u63a7\u5236\uff0c\u6307\u793a\u53d1\u9001\u65b9\u53ef\u4ee5\u53d1\u9001\u7684\u6570\u636e\u91cf<\/li>\n
        2. \u68c0\u9a8c\u548c(Checksum)\uff1a\u53602\u5b57\u8282\uff0c\u5dee\u9519\u68c0\u6d4b\uff0c\u7528\u4e8e\u9a8c\u8bc1\u6570\u636e\u5b8c\u6574\u6027<\/li>\n
        3. \u7d27\u6025\u6307\u9488(Urgent Pointer)\uff1a\u53602\u5b57\u8282\uff0c\u4ec5\u5728URG\u6807\u5fd7\u4f4d\u4e3a1\u65f6\u6709\u6548\uff0c\u6307\u793a\u7d27\u6025\u6570\u636e\u7684\u7ed3\u675f\u4f4d\u7f6e<\/li>\n
        4. \u9009\u9879(Options)\uff1a\u8fd9\u4e00\u90e8\u5206\u662f\u53ef\u9009\u5b57\u6bb5\uff0c\u4e5f\u5c31\u662f\u975e\u5fc5\u987b\u5b57\u6bb5;\u957f\u5ea6\u53ef\u53d8\uff0c\u6700\u957f\u53ef\u8fbe40\u5b57\u8282\uff0c\u7528\u4e8e\u652f\u6301\u5404\u79cdTCP\u529f\u80fd\uff0c\u5982\u6700\u5927\u62a5\u6587\u6bb5\u957f\u5ea6\uff08MSS\uff09\u3001\u7a97\u53e3\u6269\u5927\u3001\u65f6\u95f4\u6233\u548c\u9009\u62e9\u786e\u8ba4\u7b49\u3002<\/li>\n
        5. \u6709\u6548\u6570\u636e\u90e8\u5206 (Data)\uff1a\u8fd9\u90e8\u5206\u4e0d\u662f\u5fc5\u987b\u7684\uff0c\u6bd4\u5982\u5728\u5efa\u7acb\u548c\u5173\u95ed TCP \u8fde\u63a5\u7684\u9636\u6bb5\uff0c\u53cc\u65b9\u4ea4\u6362\u7684\u62a5\u6587\u6bb5\u5c31\u53ea\u5305\u542b TCP \u9996\u90e8\u3002<\/li>\n<\/ol>\n

          \u4e09\u6b21\u63e1\u624b<\/h4>\n

          \u9996\u5148\u6211\u4eec\u5f97\u77e5\u9053TCP\u662f\u5168\u53cc\u5de5\u901a\u4fe1<\/strong>\uff0c\u5b83\u8fd0\u884c\u5141\u8bb8\u6570\u636e\u540c\u65f6\u5728\u4e24\u4e2a\u65b9\u5411\u4e0a\u4f20\u8f93\uff08\u4e24\u4e2a\u4fe1\u9053\uff09\uff0c\u5373\u5141\u8bb8\u540c\u65f6\u8fdb\u884c\u53cc\u5411\u4f20\u8f93<\/strong>\uff0c\u53e6\u4e00\u65b9\u9762\u8981\u6c42\u6536\u53d1\u53cc\u65b9\u90fd\u6709\u72ec\u7acb\u7684\u63a5\u6536\u548c\u53d1\u9001\u80fd\u529b<\/p>\n

          \u8fd9\u5c31\u610f\u5473\u7740\uff0c\u5ba2\u6237\u7aef\u65e2\u80fd\u4e3b\u52a8\u6253\u5f00\u8fde\u63a5\u4e5f\u80fd\u88ab\u52a8\u6253\u5f00\u8fde\u63a5(\u53d8\u6210\u4e86\u670d\u52a1\u7aef)\uff0c\u4e3e\u4e2a\u901a\u4fd7\u70b9\u7684\u4f8b\u5b50\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\uff0c\u5c31\u50cf\u6211\u4eec\u4eba\u7c7b\uff0c2\u4e2a\u4eba\u4e4b\u95f4\uff0c\u53ef\u4ee5\u540c\u65f6\u4e3b\u52a8\u8bb2\u8bdd\uff0c\u8fd8\u80fd\u591f\uff08\u5728\u8bb2\u8bdd\u7684\u540c\u65f6\uff09\u5f7c\u6b64\u90fd\u542c\u5f97\u5230\u5bf9\u65b9\u7684\u58f0\u97f3<\/p>\n

          tcp\u7684\u6838\u5fc3\u7279\u5f81\u4e4b\u4e00\u5c31\u662f\u9762\u5411\u8fde\u63a5<\/code>\uff0c\u8fd9\u610f\u5473\u7740\u5728\u6570\u636e\u4f20\u8f93\u4e4b\u524d\uff0c\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u7aef\u5fc5\u987b\u5148\u5efa\u7acb\u8fde\u63a5\u3002\u800c\u8fd9\u4e2a\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u7aef\u7aef\u5efa\u7acb\u8fde\u63a5\u7684\u8fc7\u7a0b\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a”\u4e09\u6b21\u63e1\u624b”<\/p>\n

          \u90a3\u4ec0\u4e48\u662f\u4e09\u6b21\u63e1\u624b\u5462\uff1f\u4e3a\u4e86\u65b9\u4fbf\u5927\u5bb6\u7684\u7406\u89e3\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u5f20\u56fe<\/p>\n

          \"img\"img<\/span><\/p>\n

          \u5047\u8bbe\u5ba2\u6237\u7aef\u662f\u4e3b\u52a8\u6253\u5f00\u65b9\uff0c\u670d\u52a1\u7aef\u662f\u88ab\u52a8\u6253\u5f00\u65b9\uff0c\u4e00\u5f00\u59cb\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5904\u4e8e\u5173\u95ed\u72b6\u6001CLOSED<\/code>\u3002\u670d\u52a1\u7aef\uff0c\u6bd4\u5982\u670d\u52a1\u7aef\u4e2d\u7684\u8fdb\u7a0b\u5148\u521b\u5efa\u4f20\u8f93\u63a7\u5236\u5757TCB\uff0c\u670d\u52a1\u7aef\u4e5f\u5c31\u4f1a\u5904\u4e8e\u76d1\u542c\u72b6\u6001LISTEN<\/code>\uff0c\u4e3b\u52a8\u76d1\u542c\u67d0\u4e2a\u7aef\u53e3<\/p>\n

          \u7b2c\u4e00\u6b21\u63e1\u624b\uff1a\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u8d77\u8fde\u63a5\u8bf7\u6c42\uff0c\u5c06SYN\u63a7\u5236\u4f4d\u8bbe\u7f6e\u4e3a1<\/code>\uff0c\u8868\u793a\u00a0SYN<\/code>\u00a0\u62a5\u6587\uff1b\u5e76\u9009\u62e9\u4e00\u4e2a\u968f\u673a\u5e8f\u53f7<\/strong>seq = x<\/code>\u00a0\u3002\u53d1\u9001 SYN \u6570\u636e\u5305\u540e\uff0c\u5ba2\u6237\u7aef\u6b64\u65f6\u8fdb\u5165\u4e86\u540c\u6b65\u5df2\u53d1\u9001\u72b6\u6001 SYN-SENT<\/code>\uff0c\u7b49\u5f85\u670d\u52a1\u7aef\u7684\u786e\u8ba4<\/p>\n

          SYN<\/code>\u00a0\u62a5\u6587\u662f\u4e0d\u5305\u542b\u5e94\u7528\u5c42\u7684\u6570\u636e\uff0c\u4f46\u8981\u6d88\u8017\u6389\u4e00\u4e2a\u5e8f\u53f7<\/p><\/blockquote>\n

          \u7b2c\u4e8c\u6b21\u63e1\u624b\uff1a\u5f53\u670d\u52a1\u7aef\u6536\u5230\u5ba2\u6237\u7aef\u7684 \u8bf7\u6c42\u8fde\u63a5\u7684\u00a0SYN<\/code>\u00a0\u62a5\u6587\u540e\uff0c\u5982\u679c\u540c\u610f\u5efa\u7acb\u8fde\u63a5\uff0c\u4f1a\u9009\u62e9\u4e00\u4e2a\u968f\u673a\u5e8f\u53f7seq = y<\/code>\uff0c\u5c06SYN\u548cACK\u63a7\u5236\u4f4d\u8bbe\u7f6e\u4e3a1<\/code>\uff0c\u5e76\u5c06\u786e\u8ba4\u53f7ack\u8bbe\u7f6e\u4e3ax + 1<\/code>\u3002\u53d1\u9001\u786e\u8ba4\u62a5\u6587<\/code>\u540e\uff0c\u670d\u52a1\u7aef\u6b64\u65f6\u8fdb\u5165\u540c\u6b65\u5df2\u6536\u5230\u72b6\u6001 SYN-RECEIVED<\/code>\u3002\u8be5\u62a5\u6587\u4e5f\u4e0d\u542b\u6709\u5e94\u7528\u5c42\u7684\u6570\u636e\uff0c\u540c\u65f6\u4e5f\u4f1a\u6d88\u8017\u6389\u4e00\u4e2a\u5e8f\u53f7<\/p>\n

          \u5f53\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u7aef\u7684\u786e\u8ba4\u540e\uff0c\u5ba2\u6237\u7aef\u8fdb\u5165\u8fde\u63a5\u5df2\u5efa\u7acb\u72b6\u6001ESTABLISHED<\/code>\uff1b\u5b83\u8ba4\u4e3a\u6b64\u65f6\u8fde\u63a5\u5df2\u5efa\u7acb\uff0c\u5373\u5bf9\u4e8e\u5ba2\u6237\u7aef\u6765\u8bf4\uff0c\u7b2c\u4e8c\u6b21\u63e1\u624b<\/strong>\u540eTCP\u8fde\u63a5\u5df2\u5efa\u7acb<\/p>\n

          \u7b2c\u4e09\u6b21\u63e1\u624b\uff1a\u5f53\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u7aef\u7684\u786e\u8ba4\u540e\uff0c\u5ba2\u6237\u7aef\u8fd8\u8981\u5411\u670d\u52a1\u7aef\u53d1\u751f\u6700\u540e\u4e00\u4e2a\u5e94\u7b54\u62a5\u6587<\/code>\uff0c\u5c06ACK\u4f4d\u8bbe\u7f6e\u4e3a1<\/code>,\u786e\u8ba4\u53f7ack=y+1<\/code>\uff0c\u5e8f\u53f7seq=x+1<\/code>\uff1b\u8be5\u62a5\u6587\u53ef\u4ee5\u643a\u5e26\u5e94\u7528\u5c42\u7684\u6570\u636e<\/code>\uff0c\u5982\u679c\u4e0d\u643a\u5e26\u6570\u636e\u5219\u4e0d\u6d88\u8017\u5e8f\u53f7<\/strong>\uff0c\u540e\u7eed\u62a5\u6587\u7684\u5e8f\u53f7\u4ecd\u4e3aseq=x+1<\/code>\u3002<\/p>\n

          \u5f53\u670d\u52a1\u7aef\u6536\u5230\u8be5\u62a5\u6587\u540e\uff0c\u670d\u52a1\u7aef\u8fdb\u5165\u8fde\u63a5\u5df2\u5efa\u7acb\u72b6\u6001ESTABLISHED<\/code>\u3002\u5bf9\u4e8e\u670d\u52a1\u7aef\u6765\u8bf4\uff0c\u5728\u7b2c\u4e09\u6b21\u63e1\u624b\u540eTCP\u8fde\u63a5\u5df2\u5efa\u7acb\u3002<\/p>\n

          \u8fd9\u4e2a\u65f6\u5019\u5927\u5bb6\u5c31\u4f1a\u6709\u7591\u60d1\uff0c\u4e09\u6b21\u63e1\u624b\uff0c\u6211\u90fd\u770b\u61c2\u4e86\uff0c\u4f462\u6b21\u5c31\u4e0d\u884c\u5417\uff1f\u90a34\u6b21\u63e1\u624b\u5c82\u4e0d\u662f\u66f4\u597d\uff1f<\/p>\n

          \u6211\u4eec\u56de\u987e\u4e00\u4e0b\uff0c\u4e09\u6b21\u63e1\u624b\u505a\u4e86\u4ec0\u4e48\uff1a<\/p>\n

          \u7b2c\u4e00\u6b21\u63e1\u624b\uff0c\u5ba2\u6237\u7aef\u53d1\u9001\u4e86”\u6211\u60f3\u8981\u548c\u4f60\u5efa\u7acb\u8fde\u63a5”\u7684SYN\u62a5\u6587<\/code>\u3002<\/p>\n

          \u7b2c\u4e8c\u6b21\u63e1\u624b\uff0c\u5f53\u670d\u52a1\u7aef\u6536\u5230\u62a5\u6587\u540e\uff0c\u5982\u679c\u540c\u610f\u8fde\u63a5\uff0c\u5219\u53d1\u9001\u00a0SYN + ACK<\/code>\u00a0\u62a5\u6587\uff0c\u8868\u793a\u201c\u6211\u6536\u5230\u4e86\u4f60\u7684 SYN\uff0c\u6211\u540c\u610f\u8fde\u63a5\uff0c\u6211\u7684\u521d\u59cb\u5e8f\u5217\u53f7\u662fy\uff0c\u5e76\u4e14\u6211\u671f\u5f85\u4f60\u4e0b\u4e00\u4e2a\u53d1\u9001\u5e8f\u53f7\u662fx+1\u201d\uff1b\u7b2c\u4e8c\u6b21\u63e1\u624b\u8ba9\u5ba2\u6237\u7aef\u786e\u8ba4\u4e86\uff0c\u670d\u52a1\u7aef\u6709\u6536\u53d1\u80fd\u529b(\u63a5\u6536\u62a5\u6587\u548c\u53d1\u751f\u62a5\u6587)\uff0c\u6240\u4ee5\u5ba2\u6237\u7aef\u8fdb\u5165\u4e86\u8fde\u63a5\u5df2\u5efa\u7acb\u72b6\u6001ESTABLISHED<\/code>\u3002<\/p>\n

          \u7b2c\u4e09\u6b21\u63e1\u624b\uff0c\u5ba2\u6237\u7aef\u6536\u5230SYN + ACK<\/code>\u00a0\u62a5\u6587\uff0c\u53d1\u9001ACK<\/code>\u62a5\u6587\u7ed9\u670d\u52a1\u7aef\uff0c\u8868\u793a\u201c\u6211\u6536\u5230\u4e86\u4f60\u7684 SYN+ACK\u62a5\u6587\uff0c\u6211\u786e\u8ba4\u8fde\u63a5\u5efa\u7acb\uff0c\u6211\u671f\u5f85\u4f60\u4e0b\u4e00\u4e2a\u53d1\u9001\u5e8f\u53f7\u662fy+1\u201d\uff1b\u7b2c\u4e09\u6b21\u63e1\u624b\u8ba9\u670d\u52a1\u7aef\u786e\u8ba4\u4e86\uff0c\u5ba2\u6237\u7aef\u4e5f\u6709\u6536\u53d1\u80fd\u529b\uff0c\u6240\u4ee5\u670d\u52a1\u7aef\u8fdb\u5165\u4e86\u8fde\u63a5\u5df2\u5efa\u7acb\u72b6\u6001ESTABLISHED<\/code><\/p>\n

          \u4e09\u6b21\u63e1\u624b\u786e\u8ba4\u4e86\u53cc\u65b9\u90fd\u5177\u6709\u6536\u53d1<\/code>\u62a5\u6587\u7684\u80fd\u529b\uff0c\u53e6\u5916\u4e09\u6b21\u63e1\u624b\u8fd8\u80fd\u9632\u6b62\u5386\u53f2\u8fde\u63a5\u6216\u8005\u5df2\u5931\u6548\u7684\u8fde\u63a5\u521d\u59cb\u5316<\/code>\uff0c\u9020\u6210\u7684\u91cd\u590d\u8fde\u63a5\u6216\u8005\u8d44\u6e90\u6d6a\u8d39\u3002<\/p>\n

          \u5728\u73b0\u5b9e\u4e2d\uff0c\u67d0\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u8bf7\u6c42\uff0c\u53ef\u80fd\u56e0\u4e3a\u7f51\u7edc\u7684\u539f\u56e0\uff0c\u6ca1\u6709\u4e22\u5931\uff0c\u53cd\u800c\u5728\u7f51\u7edc\u4e2d\u6ede\u7559\u4e86\u5f88\u4e45\uff1b\u5f53\u670d\u52a1\u7aef\u6536\u5230\u8fd9\u4e2a\u5386\u53f2\u00a0SYN<\/code>\uff0c\u4f1a\u8ba4\u4e3a\u5b83\u662f\u4e00\u4e2a\u65b0\u8fde\u63a5\u8bf7\u6c42\uff0c\u4e8e\u662f\u53d1\u9001\u00a0SYN+ACK<\/code>\u00a0\u5e76\u8fdb\u5165\u00a0SYN_RECEIVED<\/code>\u00a0\u72b6\u6001<\/p>\n

          \u5982\u679c\u53ea\u67092\u6b21\u63e1\u624b\uff0c\u7531\u4e8e\u5ba2\u6237\u7aef\u5f53\u524d\u5e76\u6ca1\u6709\u53d1\u8d77\u8fd9\u4e2a\u8bf7\u6c42\uff0c\u5ba2\u6237\u7aef\u4e00\u822c\u4f1a\u5ffd\u7565\u8fd9\u4e2a\u8bf7\u6c42\uff0c\u4f46\u662f\u670d\u52a1\u7aef\u5e76\u4e0d\u77e5\u9053\uff0c\u5b83\u8fd8\u50bb\u4e4e\u4e4e\u5730\u7b49\u5f85\u5ba2\u6237\u7aef\u53d1\u9001\u6d88\u606f\uff0c\u6d6a\u8d39\u670d\u52a1\u8d44\u6e90\u3002<\/p>\n

          \u6240\u4ee5\u8fd9\u4e2a\u65f6\u5019\u9700\u8981\u7b2c3\u6b21\u63e1\u624b\uff0c\u5373\u4f7f\u670d\u52a1\u7aef\u6536\u5230\u8fd9\u4e2a\u5386\u53f2\u8fde\u63a5\uff0c\u5e76\u53d1\u51fa\u4e86SYN+ACK<\/code>\u62a5\u6587\uff0c\u7531\u4e8e\u5ba2\u6237\u7aef\u4e0d\u4f1a\u5bf9\u8fd9\u4e2a\u5386\u53f2SYN+ACK<\/code>\u62a5\u6587\uff0c\u8fdb\u884c\u00a0ACK<\/code>\u00a0\u786e\u8ba4\u3002<\/p>\n

          \u8fd9\u4e2a\u65f6\u5019\u670d\u52a1\u7aef\u7531\u4e8e\u957f\u65f6\u95f4\u6536\u4e0d\u5230\u7b2c\u4e09\u6b21\u63e1\u624b\u7684\u786e\u8ba4\u62a5\u6587\uff0c\u4f1a\u8d85\u65f6\u91cd\u4f20\u5e76\u6700\u7ec8\u653e\u5f03\u8fde\u63a5\u8bf7\u6c42<\/p>\n

          \u90a3\u4e484\u6b21\u63e1\u624b\u5462\uff0c3\u6b21\u63e1\u624b\u662f\u6700\u5c0f\u4e14\u5fc5\u8981<\/strong>\u7684\u6b21\u6570\uff0c\u5373\u4f7f\u518d\u591a\u6b21\u5b9e\u73b0\u7684\u6548\u679c\u4e5f\u548c3\u6b21\u63e1\u624b\u4e00\u6837\uff0c\u6240\u4ee5\u65e0\u9700\u4f7f\u7528\u66f4\u591a\u7684\u901a\u4fe1\u6b21\u6570<\/p>\n

          \u56db\u6b21\u6325\u624b<\/h4>\n

          \u5efa\u7acb\u4e00\u4e2aTCP<\/code>\u8fde\u63a5\u9700\u89813\u6b21\u63e1\u624b<\/code>\uff0c\u800c\u7ec8\u6b62\u4e00\u4e2a\u8fde\u63a5\u9700\u8981\u7ecf\u8fc74\u6b21\u6325\u624b<\/code>\u3002\u8fd9\u662f\u56e0\u4e3aTCP\u8fde\u63a5\u662f\u5168\u53cc\u5de5\u7684\uff0c\u4e14TCP\u652f\u6301\u534a\u5173\u95ed<\/strong>\uff08Half-Close\uff09\uff0c\u6570\u636e\u80fd\u540c\u65f6\u5728\u4e24\u4e2a\u65b9\u5411\u4e0a\u72ec\u7acb\u4f20\u8f93\uff0c\u6240\u4ee5\u6bcf\u4e2a\u65b9\u5411\u4e0a\u7684\u8fde\u63a5\uff0c\u5fc5\u987b\u5355\u72ec\u8fdb\u884c\u5173\u95ed<\/p>\n

          \u90a3\u4ec0\u4e48\u662f\u56db\u6b21\u6325\u624b\u5462\uff1f\u7ed3\u5408\u4e0b\u56fe\uff0c\u5feb\u901f\u7406\u89e3<\/p>\n

          \"img\"img<\/span><\/p>\n

          \u5047\u8bbe\u4e3b\u52a8\u5173\u95ed\u65b9\u662f\u5ba2\u6237\u7aef\uff0c\u88ab\u52a8\u5173\u95ed\u65b9\u662f\u670d\u52a1\u7aef\uff0c\u6b64\u65f6\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u7aef\u90fd\u5904\u4e8eESTABLISHED<\/code>\u72b6\u6001<\/p>\n

          \u7b2c\u4e00\u6b21\u6325\u624b\uff1a\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u9001\u00a0FIN<\/code>\u62a5\u6587\u7ed9\u670d\u52a1\u7aef\uff0c\u8bf7\u6c42 \u5173\u95edTCP\u8fde\u63a5\uff0c\u5e76\u505c\u6b62\u53d1\u9001\u6570\u636e\uff1b\u5176\u4e2d\u62a5\u6587\uff0cFIN \u6807\u5fd7\u4f4d\u8bbe\u7f6e\u4e3a1\uff0c\u5e8f\u53f7\u5b57\u6bb5\u00a0seq = x<\/code>\uff08\u5b83\u7b49\u4e8e\u524d\u9762\u4ee5\u4f20\u9001\u8fc7\u7684\u6570\u636e\u7684\u6700\u540e\u4e00\u4e2a\u5b57\u8282\u7684\u5e8f\u53f7\u52a01<\/code>\uff09\u7136\u540e\u5ba2\u6237\u7aef\u4f1a\u8fdb\u5165\u00a0FIN-WAIT-1<\/code>\u00a0\u72b6\u6001\uff0c\u7b49\u5f85\u6765\u81ea\u670d\u52a1\u7aef\u7684\u786e\u8ba4\u62a5\u6587\u3002<\/p>\n

          \u9700\u8981\u6ce8\u610f\u4e00\u4e0b\uff0cTCP\u89c4\u5b9a\uff1aFIN\u62a5\u6587\u6bb5\u5373\u4f7f\u4e0d\u643a\u5e26\u6570\u636e\uff0c\u4e5f\u6d88\u8017\u6389\u4e00\u4e2a\u5e8f\u53f7\uff01\uff01<\/p><\/blockquote>\n

          \u7b2c\u4e8c\u6b21\u6325\u624b\uff1a\u670d\u52a1\u7aef\u6536\u5230\u00a0FIN<\/code>\u00a0\u62a5\u6587\u540e\uff0c\u53d1\u56de\u786e\u8ba4\u62a5\u6587\uff0c\u786e\u8ba4\u53f7\u662fack = x + 1<\/code>\uff0cACK = 1\uff0c\u81ea\u5df1\u7684\u5e8f\u53f7 seq = y<\/code>\uff0c\u7136\u540e\u8fdb\u5165\u5173\u95ed\u7b49\u5f85\u72b6\u6001CLOSE-WAIT<\/code>\u00a0\u3002\u5ba2\u6237\u7aef\u6536\u5230\u8fd9\u4e2a\u00a0ACK<\/code>\u00a0\u540e\uff0c\u8fdb\u5165\u00a0FIN_WAIT_2<\/code>\u00a0\u72b6\u6001\uff0c\u7b49\u5f85\u670d\u52a1\u7aef\u53d1\u9001\u8fde\u63a5\u91ca\u653eFIN<\/code>\u7684\u62a5\u6587<\/p>\n

          \u670d\u52a1\u7aef(\u670d\u52a1\u5668)\u8fd8\u4f1a\u901a\u77e5\u901a\u77e5\u5e94\u7528\u8fdb\u7a0b\uff0c\u5bf9\u65b9\u5df2\u7ecf\u91ca\u653e\u8fde\u63a5\uff1b\u4e5f\u5c31\u662f\u8bf4\u6b64\u65f6\uff0c\u5ba2\u6237\u7aef->\u670d\u52a1\u7aef<\/code>\u65b9\u5411\u4e0a\u7684TCP\u8fde\u63a5\u5df2\u7ecf\u5173\u95ed\uff0c\u4f46\u670d\u52a1\u7aef->\u5ba2\u6237\u7aef<\/code>\u65b9\u5411\u4e0a\u7684TCP\u6570\u636e\u901a\u9053\u4ecd\u7136\u4f1a\u5b58\u5728\u4e00\u6bb5\u65f6\u95f4\uff0c\u5ba2\u6237\u7aef\u8fd8\u80fd\u6536\u5230\u6765\u81ea\u670d\u52a1\u7aef\u7684\u6570\u636e\uff0c\u76f4\u5230\u6536\u5230\u00a0FIN<\/code>\u00a0\u62a5\u6587\u6bb5\u3002<\/p>\n

          \u7b2c\u4e09\u6b21\u6325\u624b\uff1a\u5f53\u670d\u52a1\u7aef\u53d1\u9001\u5b8c\u6240\u6709\u6570\u636e\u540e\uff0c\u4f1a\u5411\u5ba2\u6237\u7aef\u53d1\u9001\u00a0FIN<\/code>\u00a0\u62a5\u6587\uff0c\u8bf7\u6c42\u5173\u95ed\u5b83\u8fd9\u4e2a\u65b9\u5411\u7684\u8fde\u63a5\uff0c\u5404\u5b57\u6bb5FIN = 1\uff0cACK = 1<\/code>\uff0c\u670d\u52a1\u7aef\u8fd8\u5fc5\u987b\u91cd\u590d\u4e0a\u6b21\u5df2\u53d1\u9001\u8fc7\u7684\u786e\u8ba4\u53f7ack = x + 1<\/code>,\u5047\u5b9a\u81ea\u5df1\u7684\u5e8f\u53f7seq\u4e3az<\/code>\uff0c\u670d\u52a1\u7aef\u8fdb\u5165\u6700\u540e\u786e\u8ba4\u72b6\u6001LAST_ACK<\/code>\uff0c\u7b49\u5f85\u5ba2\u6237\u7aef\u7684\u786e\u8ba4<\/p>\n

          \u7b2c\u56db\u6b21\u6325\u624b\uff1a\u5f53\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u7aef\u7684FIN<\/code>\u00a0\u62a5\u6587\uff0c\u53d1\u9001ACK<\/code>\u00a0\u62a5\u6587\u8fdb\u884c\u786e\u8ba4\uff0cACK\u7f6e\u4e3a1\uff0c\u786e\u8ba4\u53f7ack=z+1\uff0cseq=x+1<\/code>\uff0c\u5ba2\u6237\u7aef\u8fdb\u5165\u65f6\u95f4\u7b49\u5f85\u72b6\u6001TIME_WAIT\u00a0<\/code>\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6b64\u65f6\u8fde\u63a5\u8fd8\u6ca1\u6709\u91ca\u653e\uff0c\u5fc5\u987b\u7ecf\u8fc7\u65f6\u95f4\u7b49\u5f85\u8ba1\u65f6\u5668\u8bbe\u7f6e\u7684\u65f6\u95f42MSL<\/strong>\u540e\uff0c\u5ba2\u6237\u7aef\u624d\u80fd\u8fdb\u5165\u00a0CLOSED<\/code>\u00a0\u72b6\u6001\u3002<\/p>\n

          MSL,Maximum Segment Lifetime\u53eb\u505a\u6700\u957f\u62a5\u6587\u6bb5\u5bff\u547d\uff0c\u5e38\u7528\u503c\u670930\u79d2\u30011\u5206\u949f\u548c2\u5206\u949f\uff0cRFC793 \u5efa\u8bae\u8bbe\u5728\u4e24\u5206\u949f\uff0c\u4f46TCP\u5141\u8bb8\u4e0d\u540c\u7684\u5b9e\u73b0\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u60c5\u51b5\u4f7f\u7528\u66f4\u5c0f\u7684MSL\u503c\u3002<\/p><\/blockquote>\n

          \u670d\u52a1\u7aef\u6536\u5230\u8fd9\u4e2a\u6700\u7ec8\u7684ACK\u62a5\u6587\u540e\uff0c\u786e\u8ba4\u8fde\u63a5\u5173\u95ed\uff0c\u968f\u5373\u8fdb\u5165\u00a0CLOSED<\/code>\u00a0\u72b6\u6001<\/p>\n

          \u8fd9\u91cc\u53ef\u80fd\u5c31\u6709\u4eba\u8981\u95ee\u4e86\u5ba2\u6237\u7aef\u5728\u7b2c4\u6b21\u6325\u624b\u65f6\uff0c\u4e3a\u5565\u8981\u7b49\u5f852MSL\u540e\u624d\u80fd\u8fdb\u5165\u00a0CLOSED<\/code>\u00a0\u72b6\u6001\uff1f<\/p>\n

          \u8fd9\u4e3b\u8981\u662f\u56e0\u4e3a\uff0c\u7b2c4\u6b21\u6325\u624b\u7684ACK\u62a5\u6587\u6709\u53ef\u80fd\u4f1a\u4e22\u5931<\/code>\uff0c\u7b49\u5f852MSL<\/code>\u5c31\u662f\uff0c\u5f53\u8fd9\u4e2a\u00a0ACK<\/code>\u00a0\u62a5\u6587 \u4e22\u5931\uff0c\u670d\u52a1\u7aef\u4f1a\u8d85\u65f6\u91cd\u4f20 FIN\u62a5\u6587\uff0c\u5ba2\u6237\u7aef\u5728TIME_WAIT<\/code>\u72b6\u6001\u671f\u95f4\uff0c\u5982\u679c\u6536\u5230\u4e86\u91cd\u4f20\u7684 FIN \u540e\uff0c\u4f1a\u518d\u6b21\u53d1\u9001 ACK\uff0c\u4ee5\u6b64\u786e\u4fdd\u7b2c4\u6b21\u6325\u624b\u7684ACK\u62a5\u6587\u5230\u8fbe\u670d\u52a1\u7aef<\/strong><\/p>\n

          \u53e6\u4e00\u4e2a\u4f5c\u7528\uff0c\u5c31\u662f\u9632\u6b62\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u6d88\u5931<\/strong>\uff0c\u7b49\u5f85\u8db3\u591f\u957f\u7684\u65f6\u95f4\uff082MSL\uff09\uff0c\u786e\u4fdd\u7f51\u7edc\u4e2d\u6240\u6709\u5c5e\u4e8e\u8fd9\u4e2a\u8fde\u63a5\u7684\u62a5\u6587\u90fd\u5df2\u8fc7\u671f\u6d88\u5931\uff0c\u907f\u514d\u5e72\u6270\u540e\u7eed\u53ef\u80fd\u4f7f\u7528\u76f8\u540c\u7aef\u53e3\u7684\u65b0\u8fde\u63a5\u3002<\/p>\n

          \u8fd8\u6709\u4e00\u4e2a\u5e38\u89c1\u7684\u9762\u8bd5\u9898\uff0c\u4e3a\u4ec0\u4e48 TCP \u5173\u95ed\u8fde\u63a5\u4e3a\u4ec0\u4e48\u8981\u56db\u6b21\u800c\u4e0d\u662f\u4e09\u6b21\uff1f\u7b2c\u4e8c\u6b21\u6325\u624b\u548c\u7b2c\u4e09\u6b21\u6325\u624b\u80fd\u4e0d\u80fd\u5408\u5e76\u5230\u4e00\u8d77\uff1f<\/p>\n

          TCP\u662f\u5168\u5de5\u7684\uff0c\u5173\u952e\u5728\u4e8e\u7b2c\u4e8c\u6b21\u6325\u624b\u65f6\uff0c\u5f53\u670d\u52a1\u7aef\u6536\u5230\u5ba2\u6237\u7aef\u7684\u00a0FIN<\/code>\u00a0\u62a5\u6587(\u7b2c\u4e00\u6b21\u6325\u624b)\u65f6\uff0c\u5b83\u53ea\u662f\u77e5\u9053\u5ba2\u6237\u7aef\u4e0d\u518d\u53d1\u9001\u6570\u636e\uff0c\u4f46\u670d\u52a1\u7aef\u53ef\u80fd\u8fd8\u6709\u6570\u636e\u9700\u8981\u5904\u7406\u5e76\u4f20\u8f93\u7ed9\u5ba2\u6237\u7aef<\/strong>\uff0c\u6240\u4ee5\u4e0d\u80fd\u9a6c\u4e0a\u5173\u95ed\u8fde\u63a5\u3002<\/p>\n

          \u670d\u52a1\u7aef\u9700\u8981\u5148\u53d1\u9001\u00a0ACK<\/code>\u00a0\u786e\u8ba4\u6536\u5230\u4e86\u5ba2\u6237\u7aef\u7684\u5173\u95ed\u8bf7\u6c42\uff08\u7b2c\u4e8c\u6b21\u6325\u624b\uff09\uff0c\u7136\u540e\u7b49\u5f85\u5e94\u7528\u5c42\u5904\u7406\u5b8c\u6570\u636e\u5e76\u51b3\u5b9a\u5173\u95ed<\/strong>\uff0c\u6700\u540e\u518d\u53d1\u9001\u81ea\u5df1\u7684\u00a0FIN<\/code>\uff08\u7b2c\u4e09\u6b21\u6325\u624b\uff09\uff0c\u7136\u540e\u5ba2\u6237\u7aef\u518d\u505a\u51fa\u5e94\u7b54\uff0c\u56e0\u6b64\u4e00\u5171\u9700\u8981\u56db\u6b21\u6325\u624b<\/p>\n

          \u56db\u6b21\u6325\u624b\u662f\u4fdd\u8bc1\u4e86\u53cc\u65b9\u90fd\u77e5\u9053\u5e76\u4e14\u90fd\u5df2\u7ecf\u65ad\u5f00\u8fde\u63a5\uff0c\u786e\u4fdd\u6570\u636e\u5728TCP\u5173\u95ed\u8fc7\u7a0b\u4e2d\u80fd\u591f\u88ab\u5b8c\u6574\u4f20\u8f93\uff0c\u540c\u65f6\u4e5f\u5141\u8bb8\u5ef6\u8fdf\u7684\u6570\u636e\u5305\u5728\u5173\u95ed\u540e\u4ecd\u7136\u80fd\u591f\u88ab\u63a5\u6536<\/p>\n

          \u4f46\u6709\u4e9b\u9762\u8bd5\u5b98\u53ef\u80fd\u6bd4\u8f83\u6709\u7ecf\u9a8c\uff0c\u4f1a\u7279\u522b\u5f3a\u8c03\u5728\u73b0\u5b9e\u5de5\u4f5c\u4e2d\uff0c\u7b2c\u4e8c\u6b21\u6325\u624b\u548c\u7b2c\u4e09\u6b21\u6325\u624b\uff0c\u771f\u7684\u4e0d\u5b58\u5728\u5408\u5e76\u7684\u60c5\u51b5\u5417\uff1f<\/p>\n

          \u5176\u5b9e\u6211\u4eec\u6293\u5305\u7684\u8bdd\uff0c\u4f1a\u53d1\u73b0\u5728\u67d0\u4e9b\u573a\u666f\u4e0b\uff0c\u7b2c\u4e8c\u6b21\u6325\u624b\u548c\u7b2c\u4e09\u6b21\u6325\u624b”\u5408\u5e76”\u5230\u4e00\u8d77\u4e86\uff0c\u5f53\u7b2c\u4e00\u6b21\u6325\u624b\u540e\uff0c\u670d\u52a1\u7aef\u6536\u5230\u5ba2\u6237\u7aef\u00a0FIN<\/code>\u00a0\u65f6\uff0c\u6070\u597d\u6ca1\u6709\u6570\u636e\u8981\u53d1\u9001\u4e86\uff0c\u540c\u65f6\u5f00\u542f\u4e86TCP\u5ef6\u8fdf\u786e\u8ba4\u673a\u5236<\/strong><\/p>\n

          \u4e3a\u4e86\u63d0\u5347TCP\u4f20\u8f93\u6548\u7387\uff0cTCP\u5ef6\u8fdf\u786e\u8ba4\u673a\u5236\uff0c\u5f53\u9047\u5230\u6ca1\u6709\u643a\u5e26\u6570\u636e\u7684ACK\u62a5\u6587\uff0c\u5c06\u7b2c\u4e8c\u6b21\u6325\u624b\u7684\u00a0ACK<\/code>\u5ef6\u8fdf\u7b49\u5f85\uff0c \u7b49\u540e\u9762\u7684\u7b2c\u4e09\u6b21\u6325\u624b\u00a0FIN<\/code>\u62a5\u6587\u8fc7\u6765\uff0c\u5408\u5e76\u6210\u4e00\u4e2a\u00a0ACK + FIN<\/code>\u00a0\u62a5\u6587\u4e00\u8d77\u53d1\u9001\uff0c\u8fd9\u6837\u770b\u8d77\u6765\u5c31\u50cf\u201c\u4e09\u6b21\u6325\u624b\u201d\u4e86\u3002\u8fd9\u79cd\u5c5e\u4e8e\u7279\u6b8a\u60c5\u51b5\uff0c\u6211\u4eec\u8fd8\u662f\u5f97\u8bb0\u4f4f\uff0cTCP\u7684\u89c4\u8303\u5c31\u662f\u56db\u6b21\u6325\u624b<\/p>\n

          \u5c3e\u8bed<\/h4>\n

          TCP\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b\u673a\u5236\uff0c\u90fd\u662f\u4e3a\u4e86\u5728\u4e0d\u53ef\u9760\u7684IP\u7f51\u7edc\u5c42<\/strong>\u4e4b\u4e0a,\u4e0d\u53ef\u9760\u4fe1\u9053<\/strong>\u4e0a\uff0c”\u5c3d\u53ef\u80fd\u5730<\/strong>“\u63d0\u4f9b\u53ef\u9760\u7684\u7aef\u5230\u7aef\u7684\u4f20\u8f93\u670d\u52a1<\/strong>\u3002\u901a\u8fc7\u786e\u8ba4\u673a\u5236\u3001\u5e8f\u5217\u53f7\u3001\u5ef6\u8fdf\u673a\u5236\u548c\u72b6\u6001\u7ba1\u7406\uff0c\u786e\u4fdd\u4e86\u6570\u636e\u4f20\u8f93\u7684\u53ef\u9760\u6027\u3001\u6709\u5e8f\u6027\u548c\u8fde\u63a5\u7ba1\u7406\u7684\u6b63\u786e\u6027<\/p>\n

          \u5927\u5bb6\u89c9\u5f97\uff0c\u5373\u4f7f\u6709\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b\u7b49\u4e00\u7cfb\u5217\u7684\u673a\u5236\uff0cTCP\u8fde\u63a5\u771f\u7684\u80fd\u201c\u5b8c\u5168\u53ef\u9760\u201d\u5417\uff1f<\/p>\n

          \u5b9e\u9645\u4e0a\u5b83\u5e76\u4e0d\u662f”\u94f6\u5f39”,\u4f46\u4e0d\u7ba1\u5982\u4f55\uff0c\u8fd9\u4e9b\u673a\u5236\u81f3\u5c11\u53ef\u4ee5\u786e\u8ba4\u8fde\u63a5\u662f”\u57fa\u672c\u53ef\u7528”\u7684\uff0c\u6240\u4ee5TCP\u4e2d\u7684”\u63e1\u624b3\u56de\uff0c\u6325\u624b4\u6b21”\u4e0d\u6127\u662f\u662f\u8f6f\u4ef6\u5de5\u7a0b\u4e2d\u591a\u65b9”\u6743\u8861”\u7684\u7ecf\u5178\u6848\u4f8b<\/p>\n

          \u6587\u7ae0\u6765\u81ea\uff1a51CTO<\/p>\n<\/div>\n<\/div>\n

          <\/div>\n

          <\/g><\/svg><\/i> \"Loading\"<\/p>\n

          <\/div>\n","protected":false},"excerpt":{"rendered":"

          TCP\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u548c\u56db\u6b21\u6325\u624b\u673a\u5236\uff0c\u90fd\u662f\u4e3a\u4e86\u5728\u4e0d\u53ef\u9760\u7684IP\u7f51\u7edc\u5c42\u4e4b\u4e0a,\u4e0d\u53ef\u9760\u4fe1\u9053\u4e0a\uff0c”\u5c3d\u53ef\u80fd\u5730&#8 […]<\/p>\n

          <\/div>\n

          <\/g><\/svg><\/i> \"Loading\"<\/p>\n

          <\/div>\n","protected":false},"author":56,"featured_media":30240,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"footnotes":""},"categories":[1,3,23,20,80],"tags":[2305],"class_list":["post-30237","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","category-ai","category-23","category-20","category-80","tag-tcp"],"_links":{"self":[{"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/posts\/30237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/users\/56"}],"replies":[{"embeddable":true,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/comments?post=30237"}],"version-history":[{"count":3,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/posts\/30237\/revisions"}],"predecessor-version":[{"id":30243,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/posts\/30237\/revisions\/30243"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/media\/30240"}],"wp:attachment":[{"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/media?parent=30237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/categories?post=30237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aif.amtbbs.org\/index.php\/wp-json\/wp\/v2\/tags?post=30237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}