{"id":209689,"date":"2025-10-23T20:49:41","date_gmt":"2025-10-23T12:49:41","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209689\/"},"modified":"2025-10-23T20:49:42","modified_gmt":"2025-10-23T12:49:42","slug":"cdn-ddos","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209689\/","title":{"rendered":"CDN\u6297DDoS\u5b9e\u6218\uff1a\u5173\u952e\u7b56\u7565\u4e0e\u90e8\u7f72\u8981\u70b9"},"content":{"rendered":"<p>\u5728\u5f53\u4eca\u4e92\u8054\u7f51\u73af\u5883\u4e2d\uff0c\u5206\u5e03\u5f0f\u62d2\u7edd\u670d\u52a1\u653b\u51fb\uff08DDoS\uff09\u5df2\u6210\u4e3a\u4f01\u4e1a\u548c\u7ad9\u957f\u5fc5\u987b\u9762\u5bf9\u7684\u5e38\u89c1\u5a01\u80c1\u3002\u968f\u7740\u4e1a\u52a1\u5168\u7403\u5316\uff0c\u8bb8\u591a\u7f51\u7ad9\u548c\u5e94\u7528\u9009\u62e9\u5728\u4e91\u7aef\u6216\u6d77\u5916\u90e8\u7f72\uff0c\u4f8b\u5982\u4f7f\u7528\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u6216\u65e5\u672c\u670d\u52a1\u5668\u7b49\uff0c\u4ee5\u63d0\u9ad8\u8bbf\u95ee\u901f\u5ea6\u4e0e\u5197\u4f59\u6027\u3002\u672c\u6587\u805a\u7126\u4e8e\u5982\u4f55\u901a\u8fc7\u5185\u5bb9\u5206\u53d1\u7f51\u7edc\uff08CDN\uff09\u6784\u5efa\u6709\u6548\u7684\u6297DDoS\u65b9\u6848\uff0c\u63d0\u4f9b\u53ef\u64cd\u4f5c\u7684\u6280\u672f\u7ec6\u8282\u4e0e\u90e8\u7f72\u8981\u70b9\uff0c\u5e2e\u52a9\u5f00\u53d1\u8005\u3001\u7ad9\u957f\u548c\u4f01\u4e1a\u7528\u6237\u5236\u5b9a\u5408\u7406\u9632\u62a4\u7b56\u7565\u3002<\/p>\n<h2>\u4e00\u3001DDoS 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\u5728\u6297DDoS \u4e2d\u7684\u6838\u5fc3\u529f\u80fd\u4e0e\u539f\u7406<\/h2>\n<p>CDN \u6297DDoS \u7684\u4ef7\u503c\u5728\u4e8e\u5c06\u6d41\u91cf\u5206\u6563\u5230\u5168\u7403\u8fb9\u7f18\u8282\u70b9\uff0c\u5e76\u5728\u8fb9\u7f18\u8fdb\u884c\u521d\u6b65\u8fc7\u6ee4\u4e0e\u7f13\u5b58\uff0c\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u3002\u5173\u952e\u6280\u672f\u70b9\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>Anycast \u4e0e\u5168\u7403\u8def\u7531\uff1a<\/strong>Anycast \u5c06\u76f8\u540cIP\u5ba3\u5e03\u5230\u591a\u4e2a\u8282\u70b9\uff0c\u653b\u51fb\u6d41\u91cf\u88ab\u5c31\u8fd1\u5438\u6536\u5e76\u5206\u6563\uff0c\u9002\u5408\u4e0e\u591a\u4e2a\u5730\u533a\u7684\u670d\u52a1\u5668\u534f\u540c\uff08\u5982\u9999\u6e2fVPS\u3001\u7f8e\u56fdVPS\u7b49\uff09\u3002<\/li>\n<li><strong>\u6d41\u91cf\u6e05\u6d17\uff08Scrubbing\uff09\uff1a<\/strong>\u5f53\u6d41\u91cf\u8d85\u8fc7\u9608\u503c\u65f6\uff0cCDN \u53ef\u5c06\u6d41\u91cf\u5bfc\u5411\u6e05\u6d17\u4e2d\u5fc3\uff0c\u4f7f\u7528\u6df1\u5ea6\u5305\u68c0\u6d4b\uff08DPI\uff09\u3001\u534f\u8bae\u4e00\u81f4\u6027\u68c0\u67e5\u548c\u901f\u7387\u9650\u5236\u6e05\u9664\u6076\u610f\u6d41\u91cf\u3002<\/li>\n<li><strong>\u8fb9\u7f18\u7f13\u5b58\u4e0e\u901f\u7387\u9650\u5236\uff1a<\/strong>\u901a\u8fc7\u9ad8\u547d\u4e2d\u7387\u7684\u7f13\u5b58\uff08\u9759\u6001\u8d44\u6e90\u3001API\u54cd\u5e94\u7f13\u5b58\uff09\u51cf\u5c11\u6e90\u7ad9\u8bf7\u6c42\uff0c\u5e76\u5bf9\u5f02\u5e38IP\u6216\u884c\u4e3a\u5e94\u7528\u901f\u7387\u9650\u5236\u4e0e\u8fde\u63a5\u6570\u9650\u5236\u3002<\/li>\n<li><strong>\u884c\u4e3a\u4e0e\u6307\u7eb9\u8bc6\u522b\uff1a<\/strong>\u7ed3\u5408JavaScript\u6307\u7eb9\u3001Cookie\u6311\u6218\u3001TLS\u6307\u7eb9\u5224\u5b9a\u771f\u5b9e\u7528\u6237\u4e0e\u673a\u5668\u4eba\uff0c\u5e38\u7528\u4e8e\u5e94\u5bf9L7\u653b\u51fb\u3002<\/li>\n<\/ul>\n<h3>\u5173\u952e\u534f\u8bae\u4e0e\u7f51\u7edc\u5c42\u4f18\u5316<\/h3>\n<p>\u5bf9\u4e8eTCP\/UDP\u5c42\u9762\u7684\u9632\u62a4\uff0cCDN\u4e0e\u7f51\u7edc\u8fd0\u8425\u5546\u4f1a\u91c7\u7528\uff1a<\/p>\n<ul>\n<li>SYN Cookie \u4e0e\u534a\u5f00\u8fde\u63a5\u9650\u5236\uff0c\u9632\u6b62SYN Flood\u8017\u5c3d\u670d\u52a1\u5668\u8d44\u6e90\uff1b<\/li>\n<li>Ratelimit \u5bf9\u4e8eUDP\u6d41\u91cf\uff08\u5982DNS\u3001\u6e38\u620f\uff09\u5e94\u7528\u9ed1\u6d1e\u4e0e\u901f\u7387\u63a7\u5236\uff1b<\/li>\n<li>BGP\u9ed1\u6d1e\u4e0e\u6d41\u91cf\u5de5\u7a0b\uff08FlowSpec\uff09\u7528\u4e8e\u5feb\u901f\u963b\u65ad\u5df2\u8bc6\u522b\u7684\u6076\u610f\u6d41\u91cf\u3002 <\/li>\n<\/ul>\n<h2>\u4e09\u3001\u5b9e\u6218\u90e8\u7f72\u8981\u70b9\uff08\u4ece\u8fb9\u7f18\u5230\u6e90\u7ad9\u7684\u534f\u540c\u9632\u62a4\uff09<\/h2>\n<p>\u4e00\u4e2a\u6210\u719f\u7684\u6297DDoS\u65b9\u6848\u5e94\u662f\u591a\u5c42\u9632\u62a4\u7684\u7ec4\u5408\uff1aCDN\u8fb9\u7f18\u9632\u62a4 + \u6e90\u7ad9\u786c\u5316 + \u7f51\u7edc\u8fd0\u8425\u5546\u534f\u540c\u3002\u5177\u4f53\u6b65\u9aa4\uff1a<\/p>\n<h3>1. \u9009\u62e9\u5408\u9002\u7684CDN\u4e0e\u8282\u70b9\u5206\u5e03<\/h3>\n<p>\u6839\u636e\u7528\u6237\u5206\u5e03\u9009\u62e9CDN\u8282\u70b9\u8986\u76d6\u533a\u57df\uff0c\u82e5\u76ee\u6807\u7528\u6237\u5728\u4e9a\u6d32\u548c\u6b27\u7f8e\uff0c\u5efa\u8bae\u8282\u70b9\u8986\u76d6\u9999\u6e2f\u3001\u97e9\u56fd\u3001\u65b0\u52a0\u5761\u4ee5\u53ca\u7f8e\u56fd\u548c\u6b27\u6d32\u8282\u70b9\u3002\u8fd9\u6837\u53ef\u4ee5\u964d\u4f4e\u8de8\u6d0b\u94fe\u8def\u4e0a\u7684\u5e26\u5bbd\u538b\u529b\uff0c\u5e76\u63d0\u5347\u7f13\u5b58\u547d\u4e2d\u7387\u3002<\/p>\n<h3>2. Anycast + \u6e05\u6d17\u4e2d\u5fc3\u7ed3\u5408<\/h3>\n<p>\u786e\u4fddCDN\u652f\u6301Anycast\uff0c\u4e14\u4e0e\u5177\u5907\u6e05\u6d17\u80fd\u529b\u7684\u6570\u636e\u4e2d\u5fc3\u8054\u52a8\u3002\u6d41\u91cf\u5f02\u5e38\u65f6\uff0c\u81ea\u52a8\u5c06\u53ef\u7591\u6d41\u91cf\u5207\u6362\u5230\u6e05\u6d17\u8282\u70b9\uff0c\u5728\u6e05\u6d17\u5b8c\u6210\u540e\u518d\u56de\u5199\u6b63\u5e38\u8bf7\u6c42\u3002<\/p>\n<h3>3. \u8fb9\u7f18\u89c4\u5219\u4e0eWAF\u7b56\u7565<\/h3>\n<ul>\n<li>\u5728\u8fb9\u7f18\u542f\u7528WAF\u89c4\u5219\u96c6\uff08SQLi\u3001XSS\u3001\u8def\u5f84\u679a\u4e3e\uff09\u4e0e\u901f\u7387\u9650\u5236\uff1b<\/li>\n<li>\u5bf9API\u63a5\u53e3\u5e94\u7528\u66f4\u4e25\u683c\u7684\u901f\u7387\u9650\u5236\u4e0e\u8ba4\u8bc1\uff1b<\/li>\n<li>\u4f7f\u7528\u5e26\u6709\u884c\u4e3a\u6311\u6218\uff08JavaScript challenge\u3001\u9a8c\u8bc1\u7801\uff09\u7684\u52a8\u6001\u89c4\u5219\u5e94\u5bf9\u7591\u4f3c\u673a\u5668\u4eba\u3002<\/li>\n<\/ul>\n<h3>4. \u6e90\u7ad9\u9632\u62a4\u4e0e\u67b6\u6784\u5197\u4f59<\/h3>\n<p>\u5373\u4f7fCDN\u80fd\u8fc7\u6ee4\u5927\u90e8\u5206\u6d41\u91cf\uff0c\u6e90\u7ad9\u4ecd\u9700\u505a\u597d\u786c\u5316\uff1a<\/p>\n<ul>\n<li>\u5c06\u6e90\u7ad9\u90e8\u7f72\u5728\u591a\u5730\u57df\uff08\u5982\u9999\u6e2f\u670d\u52a1\u5668\u4e0e\u7f8e\u56fd\u670d\u52a1\u5668\uff09\u4ee5\u5b9e\u73b0\u5730\u57df\u5197\u4f59\uff1b<\/li>\n<li>\u4ec5\u5141\u8bb8CDN\u8282\u70b9\u8bbf\u95ee\u6e90\u7ad9\uff08\u767d\u540d\u5355\u6e90IP\uff09\uff0c\u9690\u85cf\u771f\u5b9e\u6e90\u7ad9IP\uff0c\u9632\u6b62\u76f4\u63a5\u7ed5\u8fc7CDN\u53d1\u52a8\u653b\u51fb\uff1b<\/li>\n<li>\u91c7\u7528\u8fde\u63a5\u6c60\u3001\u53cd\u5411\u4ee3\u7406\uff08\u5982Nginx\u3001HAProxy\uff09\u548c\u5e94\u7528\u9650\u6d41\uff0c\u9632\u6b62\u540e\u7aef\u8fdb\u7a0b\u8017\u5c3d\uff1b<\/li>\n<li>\u5bf9\u6570\u636e\u5e93\u4e0e\u7f13\u5b58\u5c42\uff08Redis\u3001Memcached\uff09\u8bbe\u7f6e\u8ba4\u8bc1\u4e0e\u7f51\u7edc\u9694\u79bb\u3002 <\/li>\n<\/ul>\n<h3>5. DNS \u4e0e\u57df\u540d\u6ce8\u518c\u7ba1\u7406<\/h3>\n<p>DNS \u662f\u5e38\u89c1\u653b\u51fb\u76ee\u6807\uff0c\u5e94\u91c7\u7528\u6297DDoS \u7684DNS\u670d\u52a1\u6216\u5c06DNS\u6258\u7ba1\u5728\u591a\u4f9b\u5e94\u5546\u4e0a\u3002\u540c\u65f6\u5728\u57df\u540d\u6ce8\u518c\u65f6\u6ce8\u610f\u9501\u5b9a\u9632\u6b62\u52ab\u6301\u3002\u5bf9\u4e8e\u8de8\u56fd\u4e1a\u52a1\uff0c\u53ef\u4ee5\u8003\u8651\u5728\u4e0d\u540c\u533a\u57df\u7684\u57df\u540d\u7b56\u7565\u4e0e\u89e3\u6790\u7b56\u7565\u4ee5\u5b9e\u73b0\u5907\u63f4\u3002<\/p>\n<h2>\u56db\u3001\u5e94\u7528\u573a\u666f\u4e0e\u7b56\u7565\u5bf9\u7167\uff08L3\/L4 vs 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