{"id":747,"date":"2021-07-29T14:44:59","date_gmt":"2021-07-29T06:44:59","guid":{"rendered":"https:\/\/egonlin.com\/?p=747"},"modified":"2021-07-30T10:44:23","modified_gmt":"2021-07-30T02:44:23","slug":"%e7%ac%ac%e4%b8%80%e8%8a%82%ef%bc%9atcp%e7%9a%84%e5%8d%81%e4%b8%80%e7%a7%8d%e7%8a%b6%e6%80%81","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=747","title":{"rendered":"\u7b2c\u4e00\u8282\uff1atcp\u7684\u5341\u4e00\u79cd\u72b6\u6001"},"content":{"rendered":"<h1>tcp\u7684\u5341\u4e00\u79cd\u72b6\u6001<\/h1>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/1-1.jpg'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2021\/07\/1-1.jpg\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<pre><code class=\"language-bash\">LISTEN          - \u4fa6\u542c\u6765\u81ea\u8fdc\u65b9TCP\u7aef\u53e3\u7684\u8fde\u63a5\u8bf7\u6c42\uff1b \nSYN-SENT        - \u5728\u53d1\u9001\u8fde\u63a5\u8bf7\u6c42\u540e\u7b49\u5f85\u5339\u914d\u7684\u8fde\u63a5\u8bf7\u6c42\uff1b \nSYN-RECEIVED    - \u5728\u6536\u5230\u548c\u53d1\u9001\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\u540e\u7b49\u5f85\u5bf9\u8fde\u63a5\u8bf7\u6c42\u7684\u786e\u8ba4\uff1b \nESTABLISHED     - \u4ee3\u8868\u4e00\u4e2a\u6253\u5f00\u7684\u8fde\u63a5\uff0c\u6570\u636e\u53ef\u4ee5\u4f20\u9001\u7ed9\u7528\u6237\uff1b \nFIN-WAIT-1      - \u7b49\u5f85\u8fdc\u7a0bTCP\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\uff0c\u6216\u5148\u524d\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\u7684\u786e\u8ba4\uff1b\nFIN-WAIT-2      - \u4ece\u8fdc\u7a0bTCP\u7b49\u5f85\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\uff1b \nCLOSE-WAIT      - \u7b49\u5f85\u4ece\u672c\u5730\u7528\u6237\u53d1\u6765\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\uff1b \nCLOSING         - \u7b49\u5f85\u8fdc\u7a0bTCP\u5bf9\u8fde\u63a5\u4e2d\u65ad\u7684\u786e\u8ba4\uff1b \nLAST-ACK        - \u7b49\u5f85\u539f\u6765\u53d1\u5411\u8fdc\u7a0bTCP\u7684\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\u7684\u786e\u8ba4\uff1b \nTIME-WAIT       - \u7b49\u5f85\u8db3\u591f\u7684\u65f6\u95f4\u4ee5\u786e\u4fdd\u8fdc\u7a0bTCP\u63a5\u6536\u5230\u8fde\u63a5\u4e2d\u65ad\u8bf7\u6c42\u7684\u786e\u8ba4\uff1b \nCLOSED          - \u6ca1\u6709\u4efb\u4f55\u8fde\u63a5\u72b6\u6001\uff1b<\/code><\/pre>\n<p>\u4e0a\u56fe\u4e3b\u8981\u5305\u62ec\u4e09\u90e8\u5206\uff1a<strong>\u5efa\u7acb\u8fde\u63a5\u3001\u4f20\u8f93\u6570\u636e\u3001\u65ad\u5f00\u8fde\u63a5\u3002<\/strong><\/p>\n<p>\u200b   \u5efa\u7acbTCP\u8fde\u63a5\u5f88\u7b80\u5355\uff0c\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u4fbf\u53ef\u5efa\u7acb\u8fde\u63a5\u3002\u5efa\u7acb\u597d\u8fde\u63a5\u540e\uff0c\u5f00\u59cb\u4f20\u8f93\u6570\u636e\u3002TCP\u6570\u636e\u4f20\u8f93\u7275\u6d89\u5230\u7684\u6982\u5ff5\u5f88\u591a\uff1a\u8d85\u65f6\u91cd\u4f20\u3001\u5feb\u901f\u91cd\u4f20\u3001\u6d41\u91cf\u63a7\u5236\u3001\u62e5\u585e\u63a7\u5236\u7b49\u7b49\u3002\u65ad\u5f00\u8fde\u63a5\u7684\u8fc7\u7a0b\u4e5f\u5f88\u7b80\u5355\uff0c\u901a\u8fc7\u56db\u6b21\u63e1\u624b\u5b8c\u6210\u65ad\u5f00\u8fde\u63a5\u7684\u8fc7\u7a0b\u3002<strong>\u4e09\u6b21\u63e1\u624b\u5efa\u7acb\u8fde\u63a5\uff1a<\/strong><\/p>\n<p>\u200b   <strong>\u7b2c\u4e00\u6b21\u63e1\u624b\uff1a<\/strong>\u5ba2\u6237\u7aef\u53d1\u9001syn\u5305(seq=x)\u5230\u670d\u52a1\u5668\uff0c\u5e76\u8fdb\u5165SYN_SEND\u72b6\u6001\uff0c\u7b49\u5f85\u670d\u52a1\u5668\u786e\u8ba4;<strong>\u7b2c\u4e8c\u6b21\u63e1\u624b\uff1a<\/strong>\u670d\u52a1\u5668\u6536\u5230syn\u5305\uff0c\u5fc5\u987b\u786e\u8ba4\u5ba2\u6237\u7684SYN(ack=x+1)\uff0c\u540c\u65f6\u81ea\u5df1\u4e5f\u53d1\u9001\u4e00\u4e2aSYN\u5305(seq=y)\uff0c\u5373SYN+ACK\u5305\uff0c\u6b64\u65f6\u670d\u52a1\u5668\u8fdb\u5165SYN_RECV\u72b6\u6001;<strong>\u7b2c\u4e09\u6b21\u63e1\u624b\uff1a<\/strong>\u5ba2\u6237\u7aef\u6536\u5230\u670d\u52a1\u5668\u7684SYN+ACK\u5305\uff0c\u5411\u670d\u52a1\u5668\u53d1\u9001\u786e\u8ba4\u5305ACK(ack=y+1)\uff0c\u6b64\u5305\u53d1\u9001\u5b8c\u6bd5\uff0c\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u8fdb\u5165ESTABLISHED\u72b6\u6001\uff0c\u5b8c\u6210\u4e09\u6b21\u63e1\u624b\u3002<\/p>\n<p>\u200b   \u63e1\u624b\u8fc7\u7a0b\u4e2d\u4f20\u9001\u7684\u5305\u91cc\u4e0d\u5305\u542b\u6570\u636e\uff0c\u4e09\u6b21\u63e1\u624b\u5b8c\u6bd5\u540e\uff0c\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u624d\u6b63\u5f0f\u5f00\u59cb\u4f20\u9001\u6570\u636e\u3002\u7406\u60f3\u72b6\u6001\u4e0b\uff0cTCP\u8fde\u63a5\u4e00\u65e6\u5efa\u7acb\uff0c\u5728\u901a\u4fe1\u53cc\u65b9\u4e2d\u7684\u4efb\u4f55\u4e00\u65b9\u4e3b\u52a8\u5173\u95ed\u8fde\u63a5\u4e4b\u524d\uff0cTCP \u8fde\u63a5\u90fd\u5c06\u88ab\u4e00\u76f4\u4fdd\u6301\u4e0b\u53bb\u3002<\/p>\n<p>\u200b   SYN\u6d2a\u6c34\u653b\u51fb\uff1a\u6839\u636eTCP\u4e09\u6b21\u63e1\u624b\u6709\u59cb\u6709\u7ec8\u7684\u7279\u6027\uff0c\u8fdb\u884c\u5927\u89c4\u6a21SYN\u8bf7\u6c42\uff0c\u4f46\u4e0d\u8fd4\u56deACK\u3002\u5bfc\u81f4\u670d\u52a1\u7aef\u5185\u5b58\u7f13\u51b2\uff08\u6709\u9650\u7684\uff09\u88ab\u5360\u7528\u3002\u5982\u679c\u6076\u610f\u653b\u51fb\u65b9\u5feb\u901f\u8fde\u7eed\u5730\u53d1\u9001\u6b64\u7c7b\u8fde\u63a5\u8bf7\u6c42\uff0c\u8be5<a href=\"https:\/\/baike.baidu.com\/item\/\u670d\u52a1\u5668\">\u670d\u52a1\u5668<\/a>\u53ef\u7528\u7684TCP\u8fde\u63a5\u961f\u5217\u5c06\u5f88\u5feb\u88ab\u963b\u585e\uff0c\u7cfb\u7edf\u53ef\u7528\u8d44\u6e90\u6025\u5267\u51cf\u5c11\uff0c\u7f51\u7edc\u53ef\u7528\u5e26\u5bbd\u8fc5\u901f\u7f29\u5c0f\uff0c\u957f\u6b64\u4e0b\u53bb\uff0c\u9664\u4e86\u5c11\u6570\u5e78\u8fd0\u7528\u6237\u7684\u8bf7\u6c42\u53ef\u4ee5\u63d2\u5728\u5927\u91cf\u865a\u5047\u8bf7\u6c42\u95f4\u5f97\u5230\u5e94\u7b54\u5916\uff0c\u670d\u52a1\u5668\u5c06\u65e0\u6cd5\u5411\u7528\u6237\u63d0\u4f9b\u6b63\u5e38\u7684\u5408\u6cd5\u670d\u52a1\u3002<\/p>\n<p>\u200b   dos\u653b\u51fb\uff1adenied of service 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<strong>\u4f20\u8f93\u6570\u636e\u8fc7\u7a0b\uff1a<\/strong><\/p>\n<p><strong>a.\u8d85\u65f6\u91cd\u4f20<\/strong>\u8d85\u65f6\u91cd\u4f20\u673a\u5236\u7528\u6765\u4fdd\u8bc1TCP\u4f20\u8f93\u7684\u53ef\u9760\u6027\u3002\u6bcf\u6b21\u53d1\u9001\u6570\u636e\u5305\u65f6\uff0c\u53d1\u9001\u7684\u6570\u636e\u62a5\u90fd\u6709seq\u53f7\uff0c\u63a5\u6536\u7aef\u6536\u5230\u6570\u636e\u540e\uff0c\u4f1a\u56de\u590dack\u8fdb\u884c\u786e\u8ba4\uff0c\u8868\u793a\u67d0\u4e00seq 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