{"id":1195,"date":"2022-07-09T22:41:23","date_gmt":"2022-07-09T14:41:23","guid":{"rendered":"http:\/\/175.24.184.226\/?p=1195"},"modified":"2022-07-09T22:42:56","modified_gmt":"2022-07-09T14:42:56","slug":"%e8%af%a6%e8%a7%a3tcp%e8%bf%9e%e6%8e%a5%e7%9a%84%e4%b8%89%e6%ac%a1%e6%8f%a1%e6%89%8b%e4%b8%8e%e5%9b%9b%e6%ac%a1%e6%8c%a5%e6%89%8b%e4%b8%8a-ahuntsun","status":"publish","type":"post","link":"\/?p=1195","title":{"rendered":"\u8be6\u89e3TCP\u8fde\u63a5\u7684\u201c\u4e09\u6b21\u63e1\u624b\u201d\u4e0e\u201c\u56db\u6b21\u6325\u624b\u201d(\u4e0a) &#8211; AhuntSun"},"content":{"rendered":"<h2>\u4e00\u3001TCP connection<\/h2>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/1845293-20191213141404972-797598153.png\" alt=\"\" \/>   <img src=\"https:\/\/img2018.cnblogs.com\/blog\/1845293\/201912\/1845293-20191212131315410-423220284.png\" alt=\"\" \/>   <\/p>\n<p>\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u6570\u636e\u7684\u53d1\u9001\u548c\u8fd4\u56de\u7684\u8fc7\u7a0b\u5f53\u4e2d\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u53ebTCP connection\u7684\u4e1c\u897f\uff1b   \u7531\u4e8eTCP\u4e0d\u5b58\u5728\u8fde\u63a5\u7684\u6982\u5ff5\uff0c\u53ea\u5b58\u5728\u8bf7\u6c42\u548c\u54cd\u5e94\uff0c\u8bf7\u6c42\u548c\u54cd\u5e94\u90fd\u662f\u6570\u636e\u5305\uff0c\u5b83\u4eec\u4e4b\u95f4\u90fd\u662f\u7ecf\u8fc7\u7531TCP\u521b\u5efa\u7684\u4e00\u4e2a\u4ece\u5ba2\u6237\u7aef\u53d1\u8d77\uff0c\u670d\u52a1\u5668\u63a5\u6536\u7684\u7c7b\u4f3c\u8fde\u63a5\u7684\u901a\u9053\uff0c\u8fd9\u4e2a\u8fde\u63a5\u53ef\u4ee5\u4e00\u76f4\u4fdd\u6301\uff0chttp\u8bf7\u6c42\u662f\u5728\u8fd9\u4e2a\u8fde\u63a5\u7684\u57fa\u7840\u4e0a\u53d1\u9001\u7684\uff1b <\/p>\n<p>\u5728\u4e00\u4e2aTCP\u8fde\u63a5\u4e0a\u662f\u53ef\u4ee5\u53d1\u9001\u591a\u4e2ahttp\u8bf7\u6c42\u7684\uff0c\u4e0d\u540c\u7684\u7248\u672c\u8fd9\u4e2a\u6a21\u5f0f\u4e0d\u4e00\u6837\u3002<\/p>\n<p>\u5728HTTP\/1.0\u4e2d\u8fd9\u4e2aTCP\u8fde\u63a5\u662f\u5728http\u8bf7\u6c42\u521b\u5efa\u7684\u65f6\u5019\u540c\u6b65\u521b\u5efa\u7684\uff0chttp\u8bf7\u6c42\u53d1\u9001\u5230\u670d\u52a1\u5668\u7aef\uff0c\u670d\u52a1\u5668\u7aef\u54cd\u5e94\u4e86\u4e4b\u540e\uff0c\u8fd9\u4e2aTCP\u8fde\u63a5\u5c31\u5173\u95ed\u4e86\uff1b <\/p>\n<p>HTTP\/1.1\u4e2d\u53ef\u4ee5\u4ee5\u67d0\u79cd\u65b9\u5f0f\u58f0\u660e\u8fd9\u4e2a\u8fde\u63a5\u4e00\u76f4\u4fdd\u6301\uff0c\u4e00\u4e2a\u8bf7\u6c42\u4f20\u8f93\u5b8c\u4e4b\u540e\uff0c\u53e6\u4e00\u4e2a\u8bf7\u6c42\u53ef\u4ee5\u63a5\u7740\u4f20\u8f93\u3002<\/p>\n<p>\u8fd9\u6837\u7684\u597d\u5904\u662f\uff1a\u5728\u521b\u5efa\u4e00\u4e2aTCP\u8fde\u63a5\u7684\u8fc7\u7a0b\u4e2d\u9700\u8981\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u6d88\u8017\uff0c\u201c\u4e09\u6b21\u63e1\u624b\u201d\u4ee3\u8868\u6709\u4e09\u6b21\u7f51\u7edc\u4f20\u8f93\u3002   \u5982\u679cTCP\u8fde\u63a5\u4fdd\u6301\uff0c\u7b2c\u4e8c\u4e2a\u8bf7\u6c42\u53d1\u9001\u5c31\u6ca1\u6709\u8fd9\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u6d88\u8017\u3002HTTP\/2\u4e2d\u540c\u4e00\u4e2aTCP\u8fde\u63a5\u91cc\u8fd8\u53ef\u4ee5\u5e76\u53d1\u5730\u4f20\u8f93http\u8bf7\u6c42\u3002 <\/p>\n<h2>\u4e8c\u3001TCP\u62a5\u6587\u683c\u5f0f\u7b80\u4ecb<\/h2>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/1845293-20191212131430416-1543284115.png\" alt=\"\" \/>   <\/p>\n<p><strong>\u5176\u4e2d\u6bd4\u8f83\u91cd\u8981\u7684\u5b57\u6bb5\u6709\uff1a<\/strong> <\/p>\n<p><strong>\uff081\uff09\u5e8f\u53f7\uff08sequence number\uff09\uff1a<\/strong>Seq\u5e8f\u53f7\uff0c\u536032\u4f4d\uff0c\u7528\u6765\u6807\u8bc6\u4eceTCP\u6e90\u7aef\u5411\u76ee\u7684\u7aef\u53d1\u9001\u7684\u5b57\u8282\u6d41\uff0c\u53d1\u8d77\u65b9\u53d1\u9001\u6570\u636e\u65f6\u5bf9\u6b64\u8fdb\u884c\u6807\u8bb0\u3002 <strong>\uff082\uff09\u786e\u8ba4\u53f7\uff08acknowledgement number\uff09\uff1a<\/strong>Ack\u5e8f\u53f7\uff0c\u536032\u4f4d\uff0c\u53ea\u6709ACK\u6807\u5fd7\u4f4d\u4e3a1\u65f6\uff0c\u786e\u8ba4\u5e8f\u53f7\u5b57\u6bb5\u624d\u6709\u6548\uff0cAck=Seq+1\u3002 <\/p>\n<p><strong>\uff083\uff09\u6807\u5fd7\u4f4d\uff08Flags\uff09\uff1a<\/strong>\u51716\u4e2a\uff0c\u5373URG\u3001ACK\u3001PSH\u3001RST\u3001SYN\u3001FIN\u7b49\uff0c\u5177\u4f53\u542b\u4e49\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>URG\uff1a\u7d27\u6025\u6307\u9488\uff08urgent pointer\uff09\u6709\u6548\u3002 <\/li>\n<li>ACK\uff1a\u786e\u8ba4\u5e8f\u53f7\u6709\u6548\u3002<\/li>\n<li>PSH\uff1a\u63a5\u6536\u65b9\u5e94\u8be5\u5c3d\u5feb\u5c06\u8fd9\u4e2a\u62a5\u6587\u4ea4\u7ed9\u5e94\u7528\u5c42\u3002<\/li>\n<li>RST\uff1a\u91cd\u7f6e\u8fde\u63a5\u3002 <\/li>\n<li>SYN\uff1a\u53d1\u8d77\u4e00\u4e2a\u65b0\u8fde\u63a5\u3002 <\/li>\n<li>FIN\uff1a\u91ca\u653e\u4e00\u4e2a\u8fde\u63a5\u3002 <\/li>\n<\/ul>\n<p><strong>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e0d\u8981\u5c06\u786e\u8ba4\u5e8f\u53f7Ack\u4e0e\u6807\u5fd7\u4f4d\u4e2d\u7684ACK\u641e\u6df7\u4e86\u3002 <\/li>\n<li>\u786e\u8ba4\u65b9Ack=\u53d1\u8d77\u65b9Seq+1\uff0c\u4e24\u7aef\u914d\u5bf9\u3002<\/li>\n<\/ul>\n<h2>\u4e09\u3001TCP\u7684\u4e09\u6b21\u63e1\u624b\uff08Three-Way Handshake\uff09<\/h2>\n<hr \/>\n<h3>1.\u201d\u4e09\u6b21\u63e1\u624b\u201d\u7684\u8be6\u89e3<\/h3>\n<p>\u6240\u8c13\u7684\u4e09\u6b21\u63e1\u624b\u5373TCP\u8fde\u63a5\u7684\u5efa\u7acb\u3002\u8fd9\u4e2a\u8fde\u63a5\u5fc5\u987b\u662f\u4e00\u65b9\u4e3b\u52a8\u6253\u5f00\uff0c\u53e6\u4e00\u65b9\u88ab\u52a8\u6253\u5f00\u7684\u3002 <\/p>\n<p>\u4ee5\u4e0b\u4e3a\u5ba2\u6237\u7aef\u4e3b\u52a8\u53d1\u8d77\u8fde\u63a5\u7684\u56fe\u89e3\uff1a<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/1845293-20191212131738006-306904945.png\" alt=\"\" \/>   <\/p>\n<p>\u63e1\u624b\u4e4b\u524d\u4e3b\u52a8\u6253\u5f00\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u7ed3\u675fCLOSED\u9636\u6bb5\uff0c\u88ab\u52a8\u6253\u5f00\u7684\u670d\u52a1\u5668\u7aef\u4e5f\u7ed3\u675fCLOSED\u9636\u6bb5\uff0c\u5e76\u8fdb\u5165LISTEN\u9636\u6bb5\u3002\u968f\u540e\u5f00\u59cb\u201c\u4e09\u6b21\u63e1\u624b\u201d\uff1a <\/p>\n<p><strong>\uff081\uff09<\/strong>\u9996\u5148\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u7aef\u53d1\u9001\u4e00\u6bb5TCP\u62a5\u6587\uff0c\u5176\u4e2d\uff1a   <\/p>\n<p><strong>\u6807\u8bb0\u4f4d<\/strong>\u4e3aSYN\uff0c\u8868\u793a\u201c\u8bf7\u6c42\u5efa\u7acb\u65b0\u8fde\u63a5\u201d;   <\/p>\n<p><strong>\u5e8f\u53f7<\/strong>\u4e3aSeq=X\uff08X\u4e00\u822c\u4e3a1\uff09\uff1b   \u968f\u540e\u5ba2\u6237\u7aef\u8fdb\u5165SYN-SENT\u9636\u6bb5\u3002 <\/p>\n<p><strong>\uff082\uff09<\/strong>\u670d\u52a1\u5668\u7aef\u63a5\u6536\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684TCP\u62a5\u6587\u4e4b\u540e\uff0c\u7ed3\u675fLISTEN\u9636\u6bb5\u3002\u5e76\u8fd4\u56de\u4e00\u6bb5TCP\u62a5\u6587\uff0c\u5176\u4e2d\uff1a   <\/p>\n<p><strong>\u6807\u5fd7\u4f4d<\/strong>\u4e3aSYN\u548cACK\uff0c\u8868\u793a\u201c\u786e\u8ba4\u5ba2\u6237\u7aef\u7684\u62a5\u6587Seq\u5e8f\u53f7\u6709\u6548\uff0c\u670d\u52a1\u5668\u80fd\u6b63\u5e38\u63a5\u6536\u5ba2\u6237\u7aef\u53d1\u9001\u7684\u6570\u636e\uff0c\u5e76\u540c\u610f\u521b\u5efa\u65b0\u8fde\u63a5\u201d\uff08\u5373\u544a\u8bc9\u5ba2\u6237\u7aef\uff0c\u670d\u52a1\u5668\u6536\u5230\u4e86\u4f60\u7684\u6570\u636e\uff09\uff1b   <\/p>\n<p><strong>\u5e8f\u53f7<\/strong>\u4e3aSeq=y\uff1b   <\/p>\n<p><strong>\u786e\u8ba4\u53f7<\/strong>\u4e3aAck=x+1\uff0c\u8868\u793a\u6536\u5230\u5ba2\u6237\u7aef\u7684\u5e8f\u53f7Seq\u5e76\u5c06\u5176\u503c\u52a01\u4f5c\u4e3a\u81ea\u5df1\u786e\u8ba4\u53f7Ack\u7684\u503c\uff1b\u968f\u540e\u670d\u52a1\u5668\u7aef\u8fdb\u5165SYN-RCVD\u9636\u6bb5\u3002<\/p>\n<p><strong>\uff083\uff09<\/strong>\u5ba2\u6237\u7aef\u63a5\u6536\u5230\u6765\u81ea\u670d\u52a1\u5668\u7aef\u7684\u786e\u8ba4\u6536\u5230\u6570\u636e\u7684TCP\u62a5\u6587\u4e4b\u540e\uff0c\u660e\u786e\u4e86\u4ece\u5ba2\u6237\u7aef\u5230\u670d\u52a1\u5668\u7684\u6570\u636e\u4f20\u8f93\u662f\u6b63\u5e38\u7684\uff0c\u7ed3\u675fSYN-SENT\u9636\u6bb5\u3002\u5e76\u8fd4\u56de\u6700\u540e\u4e00\u6bb5TCP\u62a5\u6587\u3002\u5176\u4e2d\uff1a   <\/p>\n<p><strong>\u6807\u5fd7\u4f4d<\/strong>\u4e3aACK\uff0c\u8868\u793a\u201c\u786e\u8ba4\u6536\u5230\u670d\u52a1\u5668\u7aef\u540c\u610f\u8fde\u63a5\u7684\u4fe1\u53f7\u201d\uff08\u5373\u544a\u8bc9\u670d\u52a1\u5668\uff0c\u6211\u77e5\u9053\u4f60\u6536\u5230\u6211\u53d1\u7684\u6570\u636e\u4e86\uff09\uff1b   <\/p>\n<p><strong>\u5e8f\u53f7<\/strong>\u4e3aSeq=x+1\uff0c\u8868\u793a\u6536\u5230\u670d\u52a1\u5668\u7aef\u7684\u786e\u8ba4\u53f7Ack\uff0c\u5e76\u5c06\u5176\u503c\u4f5c\u4e3a\u81ea\u5df1\u7684\u5e8f\u53f7\u503c\uff1b  <\/p>\n<p><strong>\u786e\u8ba4\u53f7<\/strong>\u4e3aAck=y+1\uff0c\u8868\u793a\u6536\u5230\u670d\u52a1\u5668\u7aef\u5e8f\u53f7Seq\uff0c\u5e76\u5c06\u5176\u503c\u52a01\u4f5c\u4e3a\u81ea\u5df1\u7684\u786e\u8ba4\u53f7Ack\u7684\u503c\uff1b   \u968f\u540e\u5ba2\u6237\u7aef\u8fdb\u5165ESTABLISHED\u9636\u6bb5\u3002 <\/p>\n<p>\u670d\u52a1\u5668\u6536\u5230\u6765\u81ea\u5ba2\u6237\u7aef\u7684\u201c\u786e\u8ba4\u6536\u5230\u670d\u52a1\u5668\u6570\u636e\u201d\u7684TCP\u62a5\u6587\u4e4b\u540e\uff0c\u660e\u786e\u4e86\u4ece\u670d\u52a1\u5668\u5230\u5ba2\u6237\u7aef\u7684\u6570\u636e\u4f20\u8f93\u662f\u6b63\u5e38\u7684\u3002\u7ed3\u675fSYN-SENT\u9636\u6bb5\uff0c\u8fdb\u5165ESTABLISHED\u9636\u6bb5\u3002 <\/p>\n<p>\u5728\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u7aef\u4f20\u8f93\u7684TCP\u62a5\u6587\u4e2d\uff0c\u53cc\u65b9\u7684\u786e\u8ba4\u53f7Ack\u548c\u5e8f\u53f7Seq\u7684\u503c\uff0c\u90fd\u662f\u5728\u5f7c\u6b64Ack\u548cSeq\u503c\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u8ba1\u7b97\u7684\uff0c\u8fd9\u6837\u505a\u4fdd\u8bc1\u4e86TCP\u62a5\u6587\u4f20\u8f93\u7684\u8fde\u8d2f\u6027\u3002\u4e00\u65e6\u51fa\u73b0\u67d0\u4e00\u65b9\u53d1\u51fa\u7684TCP\u62a5\u6587\u4e22\u5931\uff0c\u4fbf\u65e0\u6cd5\u7ee7\u7eed&quot;\u63e1\u624b&quot;\uff0c\u4ee5\u6b64\u786e\u4fdd\u4e86&quot;\u4e09\u6b21\u63e1\u624b&quot;\u7684\u987a\u5229\u5b8c\u6210\u3002<\/p>\n<p>\u6b64\u540e\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u8fdb\u884c\u6b63\u5e38\u7684\u6570\u636e\u4f20\u8f93\u3002\u8fd9\u5c31\u662f\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u8fc7\u7a0b\u3002<\/p>\n<h3>2.\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u52a8\u6001\u8fc7\u7a0b<\/h3>\n<hr \/>\n<h3>3.\u201c\u4e09\u6b21\u63e1\u624b\u201d\u7684\u901a\u4fd7\u7406\u89e3<\/h3>\n<hr \/>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/1845293-20191212132738935-1321698209.png\" alt=\"\" \/>   <\/p>\n<p>\u4e3e\u4e2a\u6817\u5b50\uff1a\u628a\u5ba2\u6237\u7aef\u6bd4\u4f5c\u7537\u5b69\uff0c\u670d\u52a1\u5668\u6bd4\u4f5c\u5973\u5b69\u3002\u7528\u4ed6\u4eec\u7684\u4ea4\u5f80\u6765\u8bf4\u660e\u201c\u4e09\u6b21\u63e1\u624b\u201d\u8fc7\u7a0b\uff1a<\/p>\n<ul>\n<li>\uff081\uff09\u7537\u5b69\u559c\u6b22\u5973\u5b69\uff0c\u4e8e\u662f\u5199\u4e86\u4e00\u5c01\u4fe1\u544a\u8bc9\u5973\u5b69\uff1a\u6211\u7231\u4f60\uff0c\u8bf7\u548c\u6211\u4ea4\u5f80\u5427\uff01;\u5199\u5b8c\u4fe1\u4e4b\u540e\uff0c\u7537\u5b69\u7126\u6025\u5730\u7b49\u5f85\uff0c\u56e0\u4e3a\u4e0d\u77e5\u9053\u4fe1\u80fd\u5426\u987a\u5229\u4f20\u8fbe\u7ed9\u5973\u5b69\u3002     <\/li>\n<li>\uff082\uff09\u5973\u5b69\u6536\u5230\u7537\u5b69\u7684\u60c5\u4e66\u540e\uff0c\u5fc3\u82b1\u6012\u653e\uff0c\u539f\u6765\u6211\u4eec\u662f\u4e24\u60c5\u76f8\u60a6\u5440\uff01\u4e8e\u662f\u7ed9\u7537\u5b69\u5199\u4e86\u4e00\u5c01\u56de\u4fe1\uff1a<strong>\u6211\u6536\u5230\u4f60\u7684\u60c5\u4e66\u4e86\uff0c<\/strong>\u4e5f\u660e\u767d\u4e86\u4f60\u7684\u5fc3\u610f\uff0c\u5176\u5b9e\uff0c\u6211\u4e5f\u559c\u6b22\u4f60\uff01\u6211\u613f\u610f\u548c\u4f60\u4ea4\u5f80\uff01;      \u5199\u5b8c\u4fe1\u4e4b\u540e\uff0c\u5973\u5b69\u4e5f\u7126\u6025\u5730\u7b49\u5f85\uff0c\u56e0\u4e3a\u4e0d\u77e5\u9053\u56de\u4fe1\u80fd\u5426\u80fd\u987a\u5229\u4f20\u8fbe\u7ed9\u7537\u5b69\u3002     *   <\/li>\n<li>\uff083\uff09\u7537\u5b69\u6536\u5230\u56de\u4fe1\u4e4b\u540e\u5f88\u5f00\u5fc3\uff0c<strong>\u56e0\u4e3a\u53d1\u51fa\u7684\u60c5\u4e66\u5973\u5b69\u6536\u5230\u4e86\uff0c<\/strong>\u5e76\u4e14\u4ece\u56de\u4fe1\u4e2d\u77e5\u9053\u4e86\u5973\u5b69\u559c\u6b22\u81ea\u5df1\uff0c\u5e76\u4e14\u613f\u610f\u548c\u81ea\u5df1\u4ea4\u5f80\u3002\u7136\u540e\u7537\u5b69\u53c8\u5199\u4e86\u4e00\u5c01\u4fe1\u544a\u8bc9\u5973\u5b69\uff1a\u4f60\u7684\u5fc3\u610f\u548c\u4fe1\u6211\u90fd\u6536\u5230\u4e86\uff0c\u8c22\u8c22\u4f60\uff0c\u8fd8\u6709\u6211\u7231\u4f60\uff01    <\/li>\n<\/ul>\n<p>\u5973\u5b69\u6536\u5230\u7537\u5b69\u7684\u56de\u4fe1\u4e4b\u540e\uff0c\u4e5f\u5f88\u5f00\u5fc3\uff0c<strong>\u56e0\u4e3a\u53d1\u51fa\u7684\u60c5\u4e66\u7537\u5b69\u6536\u5230\u4e86\u3002<\/strong>\u7531\u6b64\u7537\u5b69\u5973\u5b69\u53cc\u65b9\u90fd\u77e5\u9053\u4e86\u5f7c\u6b64\u7684\u5fc3\u610f\uff0c\u4e4b\u540e\u5c31\u5feb\u4e50\u5730\u4ea4\u6d41\u8d77\u6765\u4e86~~ <\/p>\n<p>\u8fd9\u5c31\u662f\u901a\u4fd7\u7248\u7684\u201c\u4e09\u6b21\u63e1\u624b\u201d\uff0c\u671f\u95f4\u4e00\u5171\u5f80\u6765\u4e86\u4e09\u5c01\u4fe1\u4e5f\u5c31\u662f\u201c\u4e09\u6b21\u63e1\u624b\u201d\uff0c\u4ee5\u6b64\u786e\u8ba4\u4e24\u4e2a\u65b9\u5411\u4e0a\u7684\u6570\u636e\u4f20\u8f93\u901a\u9053\u662f\u5426\u6b63\u5e38\u3002 <\/p>\n<h3>4.\u4e3a\u4ec0\u4e48\u8981\u8fdb\u884c\u7b2c\u4e09\u6b21\u63e1\u624b\uff1f<\/h3>\n<hr \/>\n<p>\u4e3a\u4e86\u9632\u6b62\u670d\u52a1\u5668\u7aef\u5f00\u542f\u4e00\u4e9b\u65e0\u7528\u7684\u8fde\u63a5\u589e\u52a0\u670d\u52a1\u5668\u5f00\u9500\u4ee5\u53ca\u9632\u6b62\u5df2\u5931\u6548\u7684\u8fde\u63a5\u8bf7\u6c42\u62a5\u6587\u6bb5\u7a81\u7136\u53c8\u4f20\u9001\u5230\u4e86\u670d\u52a1\u7aef\uff0c\u56e0\u800c\u4ea7\u751f\u9519\u8bef\u3002 <\/p>\n<p>\u7531\u4e8e\u7f51\u7edc\u4f20\u8f93\u662f\u6709\u5ef6\u65f6\u7684(\u8981\u901a\u8fc7\u7f51\u7edc\u5149\u7ea4\u548c\u5404\u79cd\u4e2d\u95f4\u4ee3\u7406\u670d\u52a1\u5668)\uff0c\u5728\u4f20\u8f93\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6bd4\u5982\u5ba2\u6237\u7aef\u53d1\u8d77\u4e86SYN=1\u521b\u5efa\u8fde\u63a5\u7684\u8bf7\u6c42(\u7b2c\u4e00\u6b21\u63e1\u624b)\u3002   <\/p>\n<p>\u5982\u679c\u670d\u52a1\u5668\u7aef\u5c31\u76f4\u63a5\u521b\u5efa\u4e86\u8fd9\u4e2a\u8fde\u63a5\u5e76\u8fd4\u56de\u5305\u542bSYN\u3001ACK\u548cSeq\u7b49\u5185\u5bb9\u7684\u6570\u636e\u5305\u7ed9\u5ba2\u6237\u7aef\uff0c\u8fd9\u4e2a\u6570\u636e\u5305\u56e0\u4e3a\u7f51\u7edc\u4f20\u8f93\u7684\u539f\u56e0\u4e22\u5931\u4e86\uff0c\u4e22\u5931\u4e4b\u540e\u5ba2\u6237\u7aef\u5c31\u4e00\u76f4\u6ca1\u6709\u63a5\u6536\u5230\u670d\u52a1\u5668\u8fd4\u56de\u7684\u6570\u636e\u5305\u3002   <\/p>\n<p>\u5ba2\u6237\u7aef\u53ef\u80fd\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u8d85\u65f6\u65f6\u95f4\uff0c\u65f6\u95f4\u5230\u4e86\u5c31\u5173\u95ed\u4e86\u8fde\u63a5\u521b\u5efa\u7684\u8bf7\u6c42\u3002\u518d\u91cd\u65b0\u53d1\u51fa\u521b\u5efa\u8fde\u63a5\u7684\u8bf7\u6c42\uff0c\u800c\u670d\u52a1\u5668\u7aef\u662f\u4e0d\u77e5\u9053\u7684\uff0c\u5982\u679c\u6ca1\u6709\u7b2c\u4e09\u6b21\u63e1\u624b\u544a\u8bc9\u670d\u52a1\u5668\u7aef\u5ba2\u6237\u7aef\u6536\u7684\u5230\u670d\u52a1\u5668\u7aef\u4f20\u8f93\u7684\u6570\u636e\u7684\u8bdd\uff0c\u670d\u52a1\u5668\u7aef\u662f\u4e0d\u77e5\u9053\u5ba2\u6237\u7aef\u6709\u6ca1\u6709\u63a5\u6536\u5230\u670d\u52a1\u5668\u7aef\u8fd4\u56de\u7684\u4fe1\u606f\u7684\u3002 <\/p>\n<p><strong>\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u7406\u89e3\u4e3a<\/strong>\uff1a<\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/1845293-20191213172857264-1062160369.png\" alt=\"\" \/>   <\/p>\n<p>\u8fd9\u6837\u6ca1\u6709\u7ed9\u670d\u52a1\u5668\u7aef\u4e00\u4e2a\u521b\u5efa\u8fd8\u662f\u5173\u95ed\u8fde\u63a5\u7aef\u53e3\u7684\u8bf7\u6c42\uff0c\u670d\u52a1\u5668\u7aef\u7684\u7aef\u53e3\u5c31\u4e00\u76f4\u5f00\u7740\uff0c\u7b49\u5230\u5ba2\u6237\u7aef\u56e0\u8d85\u65f6\u91cd\u65b0\u53d1\u51fa\u8bf7\u6c42\u65f6\uff0c\u670d\u52a1\u5668\u5c31\u4f1a\u91cd\u65b0\u5f00\u542f\u4e00\u4e2a\u7aef\u53e3\u8fde\u63a5\u3002\u90a3\u4e48\u670d\u52a1\u5668\u7aef\u4e0a\u6ca1\u6709\u63a5\u6536\u5230\u8bf7\u6c42\u6570\u636e\u7684\u4e0a\u4e00\u4e2a\u7aef\u53e3\u5c31\u4e00\u76f4\u5f00\u7740\uff0c\u957f\u6b64\u4ee5\u5f80\uff0c\u8fd9\u6837\u7684\u7aef\u53e3\u591a\u4e86\uff0c\u5c31\u4f1a\u9020\u6210\u670d\u52a1\u5668\u7aef\u5f00\u9500\u7684\u4e25\u91cd\u6d6a\u8d39\u3002 <\/p>\n<p>\u8fd8\u6709\u4e00\u79cd\u60c5\u51b5\u662f\u5df2\u7ecf\u5931\u6548\u7684\u5ba2\u6237\u7aef\u53d1\u51fa\u7684\u8bf7\u6c42\u4fe1\u606f\uff0c\u7531\u4e8e\u67d0\u79cd\u539f\u56e0\u4f20\u8f93\u5230\u4e86\u670d\u52a1\u5668\u7aef\uff0c\u670d\u52a1\u5668\u7aef\u4ee5\u4e3a\u662f\u5ba2\u6237\u7aef\u53d1\u51fa\u7684\u6709\u6548\u8bf7\u6c42\uff0c\u63a5\u6536\u540e\u4ea7\u751f\u9519\u8bef\u3002<\/p>\n<p>\u6240\u4ee5\u6211\u4eec\u9700\u8981\u201c\u7b2c\u4e09\u6b21\u63e1\u624b\u201d\u6765\u786e\u8ba4\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u8ba9\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7aef\u80fd\u591f\u53ca\u65f6\u5730\u5bdf\u89c9\u5230\u56e0\u4e3a\u7f51\u7edc\u7b49\u4e00\u4e9b\u95ee\u9898\u5bfc\u81f4\u7684\u8fde\u63a5\u521b\u5efa\u5931\u8d25\uff0c\u8fd9\u6837\u670d\u52a1\u5668\u7aef\u7684\u7aef\u53e3\u5c31\u53ef\u4ee5\u5173\u95ed\u4e86\u4e0d\u7528\u4e00\u76f4\u7b49\u5f85\u3002 <\/p>\n<p>\u4e5f\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff1a\u201c\u7b2c\u4e09\u6b21\u63e1\u624b\u201d\u662f\u5ba2\u6237\u7aef\u5411\u670d\u52a1\u5668\u7aef\u53d1\u9001\u6570\u636e\uff0c\u8fd9\u4e2a\u6570\u636e\u5c31\u662f\u8981\u544a\u8bc9\u670d\u52a1\u5668\uff0c\u5ba2\u6237\u7aef\u6709\u6ca1\u6709\u6536\u5230\u670d\u52a1\u5668\u201c\u7b2c\u4e8c\u6b21\u63e1\u624b\u201d\u65f6\u4f20\u8fc7\u53bb\u7684\u6570\u636e\u3002\u82e5\u53d1\u9001\u7684\u8fd9\u4e2a\u6570\u636e\u662f\u201c\u6536\u5230\u4e86\u201d\u7684\u4fe1\u606f\uff0c\u63a5\u6536\u540e\u670d\u52a1\u5668\u5c31\u6b63\u5e38\u5efa\u7acbTCP\u8fde\u63a5\uff0c\u5426\u5219\u5efa\u7acbTCP\u8fde\u63a5\u5931\u8d25\uff0c\u670d\u52a1\u5668\u5173\u95ed\u8fde\u63a5\u7aef\u53e3\u3002\u7531\u6b64\u51cf\u5c11\u670d\u52a1\u5668\u5f00\u9500\u548c\u63a5\u6536\u5230\u5931\u6548\u8bf7\u6c42\u53d1\u751f\u7684\u9519\u8bef\u3002<\/p>\n<h3>5.\u6293\u5305\u9a8c\u8bc1<\/h3>\n<hr \/>\n<p>\u4e0b\u9762\u662f\u7528\u6293\u5305\u5de5\u5177\u6293\u5230\u7684\u4e00\u4e9b\u6570\u636e\u5305\uff0c\u53ef\u7528\u6765\u5206\u6790TCP\u7684\u4e09\u6b21\u63e1\u624b\uff1a <\/p>\n<p><img src=\"https:\/\/lemon-guess.oss-cn-hangzhou.aliyuncs.com\/1845293-20191212133113024-1033278450.png\" alt=\"\" \/>   <\/p>\n<p>\u56fe\u4e2d\u663e\u793a\u7684\u5c31\u662f\u5b8c\u6574\u7684TCP\u8fde\u63a5\u7684\u201d\u4e09\u6b21\u63e1\u624b\u201d\u8fc7\u7a0b\u3002\u572852528 -&gt; 80\u4e2d\uff0c52528\u662f\u672c\u5730(\u5ba2\u6237\u7aef)\u7aef\u53e3\uff0c80\u662f\u670d\u52a1\u5668\u7684\u7aef\u53e3\u300280\u7aef\u53e3\u548c52528\u7aef\u53e3\u4e4b\u95f4\u7684\u4e09\u6b21\u6765\u56de\u5c31\u662f&quot;\u4e09\u6b21\u63e1\u624b&quot;\u8fc7\u7a0b\u3002 <\/p>\n<ul>\n<li>\u6ce8\u610f\u5230\u201d\u7b2c\u4e00\u6b21\u63e1\u624b\u201d\u5ba2\u6237\u7aef\u53d1\u9001\u7684TCP\u62a5\u6587\u4e2d\u4ee5[SYN]\u4f5c\u4e3a\u6807\u5fd7\u4f4d\uff0c\u5e76\u4e14\u5ba2\u6237\u7aef\u5e8f\u53f7Seq=0\uff1b <\/li>\n<li>\u63a5\u4e0b\u6765\u201d\u7b2c\u4e8c\u6b21\u63e1\u624b\u201d\u670d\u52a1\u5668\u8fd4\u56de\u7684TCP\u62a5\u6587\u4e2d\u4ee5[SYN\uff0cACK]\u4f5c\u4e3a\u6807\u5fd7\u4f4d\uff1b\u5e76\u4e14\u670d\u52a1\u5668\u7aef\u5e8f\u53f7Seq=0\uff1b\u786e\u8ba4\u53f7Ack=1(\u201c\u7b2c\u4e00\u6b21\u63e1\u624b\u201d\u4e2d\u5ba2\u6237\u7aef\u5e8f\u53f7Seq\u7684\u503c+1); <\/li>\n<li>\u6700\u540e\u201d\u7b2c\u4e09\u6b21\u63e1\u624b\u201d\u5ba2\u6237\u7aef\u518d\u5411\u670d\u52a1\u5668\u7aef\u53d1\u9001\u7684TCP\u62a5\u6587\u4e2d\u4ee5[ACK]\u4f5c\u4e3a\u6807\u5fd7\u4f4d\uff1b\u5176\u4e2d\u5ba2\u6237\u7aef\u5e8f\u53f7Seq=1\uff08\u201c\u7b2c\u4e8c\u6b21\u63e1\u624b\u201d\u4e2d\u670d\u52a1\u5668\u7aef\u786e\u8ba4\u53f7Ack\u7684\u503c\uff09\uff1b\u786e\u8ba4\u53f7Ack=1(\u201c\u7b2c\u4e8c\u6b21\u63e1\u624b\u201d\u4e2d\u670d\u52a1\u5668\u7aef\u5e8f\u53f7Seq\u7684\u503c+1)\u3002<br \/>\n\u8fd9\u5c31\u5b8c\u6210\u4e86\u201d\u4e09\u6b21\u63e1\u624b\u201d\u7684\u8fc7\u7a0b\uff0c\u7b26\u5408\u524d\u9762\u5206\u6790\u7684\u7ed3\u679c\u3002<\/p>\n<blockquote>\n<p><a href=\"https:\/\/www.cnblogs.com\/AhuntSun-blog\/p\/12037852.html\">\u8be6\u89e3TCP\u8fde\u63a5\u7684\u201c\u4e09\u6b21\u63e1\u624b\u201d\u4e0e\u201c\u56db\u6b21\u6325\u624b\u201d(\u4e0b)<\/a><\/p>\n<p>\u53c3\u8003\u8d44\u6599\uff1a <a href=\"https:\/\/www.cnblogs.com\/alva-rabbit-hole\/p\/10081169.html\">\u6df1\u5165\u6d45\u51fa\u56fe\u89e3\u3010\u8ba1\u7b97\u673a\u7f51\u7edc\u3011 \u4e4b \u3010TCP\u53ef\u9760\u4f20\u8f93\u7684\u5b9e\u73b0: \u4e09\u6b21\u63e1\u624b+\u6ed1\u52a8\u7a97\u53e3\u3011<\/a>   <\/p>\n<p><a href=\"http:\/\/www.bubuko.com\/infodetail-2526697.html\">\u4f7f\u7528 WireShark \u5206\u6790 TCP\/IP \u4e09\u6b21\u63e1\u624b \u548c \u56db\u6b21\u6325\u624b<\/a>    <\/p>\n<p>\u672c\u6587\u8f6c\u81ea <a href=\"https:\/\/www.cnblogs.com\/AhuntSun-blog\/p\/12028636.html\">https:\/\/www.cnblogs.com\/AhuntSun-blog\/p\/12028636.html<\/a>\uff0c\u5982\u6709\u4fb5\u6743\uff0c\u8bf7\u8054\u7cfb\u5220\u9664\u3002<\/p>\n<\/blockquote>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001TCP connection \u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u4e4b\u95f4\u6570\u636e\u7684\u53d1\u9001\u548c\u8fd4\u56de\u7684\u8fc7\u7a0b\u5f53\u4e2d\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u53ebTCP connection\u7684\u4e1c\u897f\uff1b \u7531\u4e8eT   \u2026 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