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<\/strong><strong>\u51c6\u786e\u5ea6\uff08Accuracy\uff09<\/strong><\/p>\n\n\n\n<p>\u51c6\u786e\u5ea6\u7684\u5f71\u54cd\u56e0\u7d20\u5305\u62ec<strong>\u4e22\u5305\u548c\u65f6\u949f\u95ee\u9898<\/strong>\u3002\u76f8\u8f83\u4e8e\u7cbe\u5ea6\u800c\u8a00\uff0c\u51c6\u786e\u5ea6\u662f\u4e00\u4e2a\u66f4\u5927\u7684\u8303\u56f4\uff0c\u5b83\u5c06\u51b3\u5b9a\u6d4b\u91cf\u7ed3\u679c\u662f\u5426\u80fd\u591f\u4f5c\u4e3a\u771f\u5b9e\u60c5\u51b5\u7684\u7f29\u5f71\u3002\u9664\u4e86\u6d4b\u8bd5\u5de5\u5177\u3001\u65b9\u6cd5\u672c\u8eab\u5e26\u6765\u7684\u504f\u5dee\u4e4b\u5916\uff0c\u6d4b\u91cf\u4e2d\u6709\u5f88\u591a\u56e0\u7d20\u4f1a\u5bfc\u81f4\u7ed3\u679c\u9519\u8bef\uff0c\u9700\u8981\u4ed4\u7ec6\u8bc4\u4f30\u5404\u7c7b\u9519\u8bef\u662f\u5426\u5b58\u5728\u53ca\u5f71\u54cd\u89c4\u6a21\u3002<\/p>\n\n\n\n<p><strong>\u6848\u4f8b1\uff1a\u62a5\u6587\u6570\u636e\u91c7\u96c6\u3001\u8fc7\u6ee4\u548c\u4e22\u5305<\/strong><\/p>\n\n\n\n<p>\u6570\u636e\u5305\u8fc7\u6ee4\uff08filtering\uff09\u7684\u672c\u8d28\u662f\u901a\u8fc7\u9884\u8bbe\u6761\u4ef6\uff0c\u5c06\u7b26\u5408\u89c4\u5219\u7684\u5305\u5b8c\u6574\u4fdd\u7559\uff0c\u6216\u4ec5\u4fdd\u7559\u90e8\u5206\u5934\u90e8\u4fe1\u606f\u3002\u4ee5tcpdump\u5de5\u5177\u4e3a\u4f8b\uff0c\u7528\u5b83\u8fdb\u884c\u6570\u636e\u5305\u91c7\u96c6\u548c\u5206\u6790\u65f6\u5c06\u53ef\u80fd\u5b58\u5728\u4e00\u7cfb\u5217\u95ee\u9898\uff0c\u4f8b\u5982\uff08\u6ce8\uff1a\u672c\u6587\u4f5c\u8005\u4e3atcpdump\u7684\u521d\u4ee3\u4f5c\u8005\u4e4b\u4e00\uff09\uff1a<\/p>\n\n\n\n<p>tcpdump\u65e0\u6cd5\u8ddf\u4e0a\u8fc7\u6ee4\u5668\u63a5\u6536\u6570\u636e\u5305\u7684\u6548\u7387\uff1b\u8fc7\u6ee4\u5668\u8ddf\u4e0d\u4e0a\u539f\u59cb\u6570\u636e\u5305\u7684\u6d41\u901f\u3002<\/p>\n\n\n\n<p>tcpdump\u5728\u8bb0\u5f55\u6545\u969c\u4fe1\u606f\u65b9\u9762\u5b58\u5728\u7f3a\u9677\uff0c\u53ea\u80fd\u751f\u6210\u5173\u4e8e\u603b\u4e22\u5305\u6570\u91cf\u7684\u6458\u8981\u4fe1\u606f\uff0c\u65e0\u6cd5\u5c06\u4e22\u5305\u4e0e\u5176\u53d1\u751f\u7684\u65f6\u95f4\u70b9\u5173\u8054\u8d77\u6765\uff1b\u800cipsumdump\u53ef\u4ee5\u5305\u62ec\u4e22\u5305\u4fe1\u606f\u548c\u6570\u636e\u5305\u3002<\/p>\n\n\n\n<p><strong>\u6848\u4f8b2\uff1a\u65f6\u949f\u4e0d\u51c6\u786e<\/strong><\/p>\n\n\n\n<p>\u65f6\u949f\u4e0d\u51c6\u786e\u73b0\u8c61\u5305\u62ec\u201c\u4e0e\u771f\u5b9e\u65f6\u95f4\u4e0d\u540c\u6b65\u201d\u3001\u201c\u65f6\u95f4\u7a81\u7136\u5411\u524d\u6216\u5411\u540e\u98d8\u79fb\u201d\uff0c\u6216\u8005\u201c\u65f6\u95f4\u4ee5\u9519\u8bef\u7684\u901f\u7387\u524d\u8fdb\u201d\u3002\u4e0e\u65f6\u949f\u7cbe\u5ea6\u7684\u533a\u522b\u5728\u4e8e\uff0c\u7cbe\u5ea6\u53ef\u4ee5\u63d0\u524d\u83b7\u77e5\uff0c\u800c\u51c6\u786e\u5ea6\u9700\u8981\u540e\u7eed\u8fdb\u884c\u6570\u636e\u5904\u7406\u3002\u4f5c\u8005\u5efa\u8bae\u5728\u5b9e\u9a8c\u4e2d\u53ef\u4ee5\u5c3d\u53ef\u80fd\u4e0e\u771f\u5b9e\u65f6\u95f4\uff08true time\uff09\u4fdd\u6301\u540c\u6b65\uff0c\u4f8b\u5982GPS\u6bd4\u901a\u8fc7NTP\u540c\u6b65\u8981\u51c6\u786e\u4e00\u4e9b\u3002\u4f46\u6709\u65f6\u201c\u7edd\u5bf9\u65f6\u95f4\u201d\u672a\u5fc5\u91cd\u8981\uff0c\u201c\u76f8\u5bf9\u65f6\u95f4\u95f4\u9694\u201d\u6216\u201c\u65f6\u949f\u53d8\u5316\u901f\u7387\u201d\u53ef\u80fd\u66f4\u91cd\u8981\u3002<\/p>\n\n\n\n<p>\u53e6\u4e00\u65b9\u9762\uff0c\u4e00\u4e9b\u5de5\u4f5c\u5728\u5b9e\u9a8c\u8bbe\u8ba1\u65f6\u9700\u8981\u4e25\u683c\u8003\u8651\u201c\u65f6\u949f\u540c\u6b65\u201d\u95ee\u9898\u3002\u4f8b\u5982Cao\u7b49\u4eba[6]\u63d0\u51fa\u7684TCP\u4fa7\u4fe1\u9053\u653b\u51fb\u6a21\u578b\u4e2d\uff0cOff-path\u653b\u51fb\u8005\u9700\u8981\u4e25\u683c\u5224\u65ad1\u79d2\u5185\u662f\u5426\u80fd\u591f\u63a5\u6536\u5230Server\u7aef\u53d1\u51fa100\u4e2aChallenge ACK\uff0c\u56e0\u6b64\u9700\u8981\u4e0eServer\u7aef\u4fdd\u6301\u65f6\u949f\u540c\u6b65\u3002<\/p>\n\n\n\n<p><strong>4. <\/strong><strong>\u7406\u89e3\u504f\u5dee\uff08Misconception\uff09<\/strong><\/p>\n\n\n\n<p>\u8d2f\u7a7f\u6d4b\u91cf\u7814\u7a76\u7684\u4e00\u4e2a\u4e3b\u8981\u95ee\u9898\u662f<strong>\u786e\u8ba4\u201c\u662f\u5426\u5bf9\u6240\u5206\u6790\u7684\u95ee\u9898\u5b58\u5728\u7406\u89e3\u504f\u5dee\u201d<\/strong>\uff0c\u4f8b\u5982\u5b9e\u9a8c\u8bbe\u8ba1\u7684\u6d4b\u91cf\u65b9\u6cd5\u6a21\u578b\u53ef\u80fd\u4e0e\u5b9e\u9645\u7f51\u7edc\u60c5\u51b5\u4e0d\u5339\u914d\u3002\u672c\u6587\u4e3e\u4f8b\u4ecb\u7ecd\u4e86\u4ee5\u4e0b\u4e24\u65b9\u9762\u95ee\u9898\uff1a<\/p>\n\n\n\n<p><strong>\u6848\u4f8b1\uff1a\u65b9\u6cd5\u8bbe\u8ba1\u4e2d\u5b58\u5728\u9519\u8bef<\/strong><strong>\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d\u200d<\/strong><\/p>\n\n\n\n<p>\uff081\uff09\u6d4b\u91cfTCP\u6570\u636e\u5305\u4e22\u5931\u7684\u95ee\u9898\uff1a\u82e5\u901a\u8fc7\u8ba1\u7b97\u91cd\u4f20\u7684\u6570\u636e\u5305\u6570\u91cf\u65b9\u6cd5\u8bc4\u4f30\uff0c\u5219\u53ef\u80fd\u5ffd\u7565\u4e86\u6570\u636e\u5305\u88ab\u7f51\u7edc\u4e0d\u5fc5\u8981\u5730\u91cd\u4f20\u6216\u590d\u5236\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\uff082\uff09\u8bc4\u4f30\u7aef\u5230\u7aefWeb\u4f20\u8f93\u65f6\u95f4\uff1a\u82e5\u76f4\u63a5\u8ba1\u7b97RTT\uff0c\u5219\u53ef\u80fd\u5ffd\u7565\u4e86\u7f51\u7edc\u4e2d\u95f4\u4ef6\uff08middlebox\uff09\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n<p>\uff083\uff09\u8ba1\u7b97TCP\u8fde\u63a5\u5927\u5c0f\u7684\u5206\u5e03\u60c5\u51b5\uff1a\u82e5\u8ba1\u7b97SYN\u548cFIN\u7684\u5e8f\u5217\u53f7\u4e4b\u5dee\uff0c\u5219\u672a\u8003\u8651\u5230\u53ef\u80fd\u76d1\u6d4b\u5f00\u59cb\u65f6\u6709\u8fde\u63a5\u5df2\u7ecf\u5efa\u7acb\uff0c\u6216\u8005\u76d1\u6d4b\u7ed3\u675f\u65f6\u6709\u8fde\u63a5\u8fd8\u672a\u65ad\u5f00\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>\uff084\uff09\u89c2\u6d4b\u70b9\u7684\u4f4d\u7f6e\uff1a\u65e0\u6cd5\u901a\u8fc7\u4e00\u4e2aAS\u89c2\u5bdf\u5230BGP\u7684\u5168\u5c40\u53ef\u8fbe\u6027\u3002<\/p>\n\n\n\n<p><strong>\u6848\u4f8b2\uff1a\u6570\u636e\u6536\u96c6\u4e0d\u5177\u6709\u4ee3\u8868\u6027<\/strong><\/p>\n\n\n\n<p><strong>\u4e0d\u540c\u7f51\u7edc\u8282\u70b9\uff0c\u6216\u8005\u540c\u4e00\u7f51\u7edc\u8282\u70b9\u7684\u4e0d\u540c\u65f6\u671f\uff0c\u4e92\u8054\u7f51\u6027\u80fd\u5b58\u5728\u8f83\u5927\u5dee\u5f02<\/strong><strong>\u3002<\/strong><\/p>\n\n\n\n<p>\u4f5c\u8005\u8ba4\u4e3a\uff0c\u7814\u7a76\u8005\u96be\u4ee5\u81ea\u5df1\u53d1\u73b0\u5bf9\u95ee\u9898\u548c\u65b9\u6cd5\u7684\u7406\u89e3\u504f\u5dee\uff0c\u5e76\u4e14\u62e5\u6709\u201c\u9886\u57df\u77e5\u8bc6\u201d\uff08domain knowledge\uff09\u7684\u4eba\u4e5f\u4e0d\u4e00\u5b9a\u80fd\u5b8c\u5168\u907f\u514d\u8fd9\u7c7b\u95ee\u9898\u3002\u56e0\u6b64\u4f5c\u8005\u5efa\u8bae\u505a\u591a\u6b21\u5b9e\u9a8c\u4ea4\u53c9\u9a8c\u8bc1\uff0c\u4f8b\u5982\u4ece<strong>\u4e0d\u540c\u4f4d\u7f6e<\/strong>\u6216<strong>\u4e0d\u540c\u65f6\u95f4<\/strong>\u591a\u6b21\u6536\u96c6\u4e0d\u540c\u6570\u636e\u96c6\u3002\u6b64\u5916\uff0c\u5728\u6d4b\u91cf\u5f00\u59cb\u4e4b\u524d\u53ef\u4ee5<strong>\u5bfb\u6c42\u540c\u884c\u4e13\u5bb6\u7684\u5e2e\u52a9<\/strong>\u3002<\/p>\n\n\n\n<p><strong>5. <\/strong><strong>\u7ed3\u679c\u6821\u9a8c\uff08Calibration\uff09<\/strong><\/p>\n\n\n\n<p>\u5728\u6d4b\u91cf\u7ed3\u675f\u65f6\uff0c\u9700\u8981\u8fdb\u884c\u7ed3\u679c\u6821\u9a8c\uff0c\u4ee5\u89e3\u51b3\u65b9\u6cd5\u5b58\u5728\u8bef\u533a\u3001\u7ea0\u6b63\u9519\u8bef\u7ed3\u679c\u7b49\u95ee\u9898\u3002\u5177\u4f53\u4ece\u4ee5\u4e0b\u65b9\u9762\u5c55\u5f00\uff1a<\/p>\n\n\n\n<p><strong>\u65b9\u97621\uff1a\u68c0\u9a8c\u79bb\u7fa4\u70b9\u3001\u5f02\u5e38\u503c<\/strong><\/p>\n\n\n\n<p>\u5728\u5bf9\u7ed3\u679c\u8fdb\u884c\u7edf\u8ba1\u5206\u6790\u65f6\uff0c\u901a\u5e38\u4f1a\u5b58\u5728\u5f88\u591a<strong>\u79bb\u7fa4\u70b9<\/strong>\uff08\u4f8b\u5982\u6781\u9ad8\u3001\u6781\u4f4e\u7684\u503c\uff09\u6216<strong>\u9aa4\u589e\u9aa4\u51cf<\/strong>\u7684\u73b0\u8c61\uff08\u4f8b\u5982\u77ed\u671f\u5185\u7684\u5927\u91cf\u91cd\u590d\uff09\u3002\u8fd9\u79cd\u5f02\u5e38\u73b0\u8c61\u53ef\u80fd\u662f\u4f1a\u5f71\u54cd\u7ed3\u8bba\u7684\u201c\u7279\u6b8a\u6848\u4f8b\u201d\uff08corner case\uff09\uff0c\u4e5f\u53ef\u80fd\u662f\u6d4b\u91cf\u65b9\u6cd5\u9519\u8bef\u5bfc\u81f4\u7684\u7ed3\u679c\uff0c\u56e0\u6b64\u9700\u8981\u989d\u5916\u5206\u6790\u539f\u56e0\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n<p>\uff081\uff09\u6d41\u91cf\u77ac\u95f4\u589e\u591a\uff0c\u53ef\u80fd\u662f\u56e0\u4e3a\u53d1\u751f\u4e86DDoS\u653b\u51fb\uff1b<\/p>\n\n\n\n<p>\uff082\uff09\u8ba1\u65f6\u5668\u8bbe\u7f6e\u9519\u8bef\uff08\u91c7\u96c6\u56fa\u5b9a\u95f4\u9694\u7684\u6d41\u91cf \u6216 \u5b9a\u671f\u91c7\u96c6\u6d41\u91cf\uff09\u5bfc\u81f4\u6d4b\u91cf\u8bef\u5dee\uff1b<\/p>\n\n\n\n<p>\uff083\uff09\u901a\u8fc7\u91c7\u96c6\u6d41\u91cf\u8ba1\u7b97RTT\u7684\u5206\u5e03\uff0c\u4f46outbound\u548cinbound 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