{"id":25017,"date":"2025-09-19T15:21:45","date_gmt":"2025-09-19T07:21:45","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-cn\/how-hong-kong-anti-ddos-servers-defend-against-syn-attacks\/"},"modified":"2025-09-19T15:26:12","modified_gmt":"2025-09-19T07:26:12","slug":"how-hong-kong-anti-ddos-servers-defend-against-syn-attacks","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-cn\/knowledge\/how-hong-kong-anti-ddos-servers-defend-against-syn-attacks\/","title":{"rendered":"\u9999\u6e2f\u9ad8\u9632\u670d\u52a1\u5668\u5982\u4f55\u9632\u5fa1SYN\u653b\u51fb"},"content":{"rendered":"<p>\u5728\u9999\u6e2f\u84ec\u52c3\u53d1\u5c55\u7684\u6570\u5b57\u57fa\u7840\u8bbe\u65bd\u4e2d,<a href=\"https:\/\/www.varidata.com\/zh-cn\/server\/hk\/cn2\/\" target=\"_blank\">\u9ad8\u9632\u670d\u52a1\u5668<\/a>\u5df2\u6210\u4e3a\u7f51\u7edc\u5b89\u5168\u9632\u5fa1\u7684\u57fa\u77f3,\u7279\u522b\u662f\u9488\u5bf9\u590d\u6742\u7684SYN\u6d2a\u6c34\u653b\u51fb\u3002\u968f\u7740\u7f51\u7edc\u5a01\u80c1\u7684\u4e0d\u65ad\u6f14\u53d8,\u4e86\u89e3\u8fd9\u4e9b\u9ad8\u9632\u670d\u52a1\u5668\u5982\u4f55\u4ece\u6280\u672f\u5c42\u9762\u5bf9\u6297SYN\u653b\u51fb\u5bf9\u7cfb\u7edf\u7ba1\u7406\u5458\u548c\u5b89\u5168\u4e13\u4e1a\u4eba\u5458\u6765\u8bf4\u53d8\u5f97\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<h2><strong>\u4e86\u89e3SYN\u653b\u51fb:\u6280\u672f\u673a\u5236<\/strong><\/h2>\n<p>SYN\u6d2a\u6c34\u653b\u51fb\u901a\u8fc7\u53d1\u9001\u5927\u91cfSYN\u6570\u636e\u5305\u4f46\u4ece\u4e0d\u5b8c\u6210\u63e1\u624b\u5e8f\u5217\u6765\u5229\u7528TCP\/IP\u4e09\u6b21\u63e1\u624b\u8fc7\u7a0b,\u4ece\u800c\u4f7f\u76ee\u6807\u670d\u52a1\u5668\u4e0d\u582a\u91cd\u8d1f\u3002\u8981\u7406\u89e3\u9632\u5fa1\u673a\u5236,\u6211\u4eec\u5fc5\u987b\u9996\u5148\u5206\u6790\u653b\u51fb\u5411\u91cf:<\/p>\n<ul>\n<li>\u653b\u51fb\u8005\u53d1\u9001\u521d\u59cbSYN\u6570\u636e\u5305<\/li>\n<li>\u670d\u52a1\u5668\u54cd\u5e94SYN-ACK\u6570\u636e\u5305<\/li>\n<li>\u4f2a\u9020\u5730\u5740\u7f3a\u5c11ACK\u54cd\u5e94<\/li>\n<li>\u670d\u52a1\u5668TCP\u8fde\u63a5\u961f\u5217\u8d44\u6e90\u8017\u5c3d<\/li>\n<\/ul>\n<h2><strong>\u786c\u4ef6\u7ea7\u9632\u62a4\u67b6\u6784<\/strong><\/h2>\n<p>\u9999\u6e2f\u9ad8\u9632\u670d\u52a1\u5668\u5b9e\u65bd\u4e86\u56f4\u7ed5\u4e09\u4e2a\u6838\u5fc3\u7ec4\u4ef6\u6784\u5efa\u7684\u591a\u5c42\u786c\u4ef6\u9632\u5fa1\u7cfb\u7edf:<\/p>\n<ol>\n<li>\u80fd\u591f\u5904\u7406\u9ad8\u8fbe800 Gbps\u7684\u9ad8\u6027\u80fd\u6d41\u91cf\u6e05\u6d17\u8bbe\u5907<\/li>\n<li>\u57fa\u4e8eFPGA\u7684\u6570\u636e\u5305\u68c0\u6d4b\u5f15\u64ce<\/li>\n<li>\u5177\u6709\u4e13\u7528\u653b\u51fb\u7f13\u89e3\u786c\u4ef6\u7684\u8d1f\u8f7d\u5747\u8861\u670d\u52a1\u5668\u96c6\u7fa4<\/li>\n<\/ol>\n<p>\u786c\u4ef6\u57fa\u7840\u8bbe\u65bd\u5229\u7528\u5148\u8fdb\u7684\u534a\u5bfc\u4f53\u6280\u672f\u8fdb\u884c\u5b9e\u65f6\u6570\u636e\u5305\u5206\u6790,\u6709\u6548\u533a\u5206\u5408\u6cd5\u6d41\u91cf\u548c\u6076\u610fSYN\u6d2a\u6c34\u3002\u8fd9\u79cd\u8bbe\u7f6e\u80fd\u591f\u5728\u4fdd\u6301\u5408\u6cd5\u8fde\u63a5\u6700\u5c0f\u5ef6\u8fdf\u7684\u540c\u65f6,\u6bcf\u79d2\u5904\u7406\u6570\u767e\u4e07\u4e2a\u6570\u636e\u5305\u3002<\/p>\n<h2><strong>\u8f6f\u4ef6\u9632\u5fa1\u673a\u5236<\/strong><\/h2>\n<p>\u8f6f\u4ef6\u5c42\u5b9e\u65bd\u4e86\u51e0\u79cd\u590d\u6742\u7684\u9632\u5fa1\u7b56\u7565:<\/p>\n<ul>\n<li>SYN Cookie\u5b9e\u73b0:\u52a0\u5bc6\u751f\u6210\u7684\u4ee4\u724c\u9a8c\u8bc1\u8fde\u63a5\u771f\u5b9e\u6027<\/li>\n<li>\u52a8\u6001TCP\u79ef\u538b\u961f\u5217\u7ba1\u7406<\/li>\n<li>\u57fa\u4e8e\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u7684\u81ea\u9002\u5e94\u901f\u7387\u9650\u5236<\/li>\n<li>\u5177\u6709\u6a21\u5f0f\u8bc6\u522b\u7684\u72b6\u6001\u5305\u68c0\u6d4b(SPI)<\/li>\n<\/ul>\n<h2><strong>\u9ad8\u7ea7\u6d41\u91cf\u8fc7\u6ee4\u6280\u672f<\/strong><\/h2>\n<p>\u9999\u6e2f\u9ad8\u9632\u670d\u52a1\u5668\u91c7\u7528\u5728\u591a\u4e2aOSI\u5c42\u8fd0\u884c\u7684\u590d\u6742\u6d41\u91cf\u8fc7\u6ee4\u673a\u5236\u3002\u8fd9\u4e9b\u7cfb\u7edf\u5229\u7528\u5148\u8fdb\u7b97\u6cd5\u5728\u653b\u51fb\u671f\u95f4\u4fdd\u6301\u670d\u52a1\u53ef\u7528\u6027:<\/p>\n<ul>\n<li>\u7b2c3\/4\u5c42DDoS\u7f13\u89e3:\n<ul>\n<li>TCP\/IP\u62a5\u5934\u5206\u6790<\/li>\n<li>\u534f\u8bae\u884c\u4e3a\u9a8c\u8bc1<\/li>\n<li>\u6d41\u91cf\u6a21\u5f0f\u8bc6\u522b<\/li>\n<\/ul>\n<\/li>\n<li>\u7b2c7\u5c42\u5e94\u7528\u7a0b\u5e8f\u4fdd\u62a4:\n<ul>\n<li>HTTP\/HTTPS\u8bf7\u6c42\u68c0\u67e5<\/li>\n<li>\u5e94\u7528\u5c42\u884c\u4e3a\u5206\u6790<\/li>\n<li>\u673a\u5668\u4eba\u68c0\u6d4b\u673a\u5236<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u667a\u80fd\u6d41\u91cf\u5206\u914d\u7cfb\u7edf<\/strong><\/h2>\n<p>\u667a\u80fd\u6d41\u91cf\u5206\u914d\u7684\u5b9e\u65bd\u5305\u62ec:<\/p>\n<ol>\n<li>\u5730\u7406\u5206\u5e03:\n<ul>\n<li>\u904d\u5e03\u4e9a\u6d32\u7684\u591a\u4e2a\u5b58\u5728\u70b9(PoPs)<\/li>\n<li>\u4efb\u64ad\u8def\u7531\u5b9e\u65bd<\/li>\n<li>\u533a\u57df\u6d41\u91cf\u4f18\u5316<\/li>\n<\/ul>\n<\/li>\n<li>\u8d1f\u8f7d\u5747\u8861\u673a\u5236:\n<ul>\n<li>\u52a8\u6001\u670d\u52a1\u5668\u5206\u914d<\/li>\n<li>\u8d44\u6e90\u5229\u7528\u76d1\u63a7<\/li>\n<li>\u81ea\u52a8\u6545\u969c\u8f6c\u79fb\u7cfb\u7edf<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2><strong>\u6700\u4f73\u9632\u62a4\u6280\u672f\u89c4\u683c<\/strong><\/h2>\n<p>\u5728\u914d\u7f6e\u9999\u6e2f\u9ad8\u9632\u670d\u52a1\u5668\u79df\u7528\u89e3\u51b3\u65b9\u6848\u65f6,\u9700\u8981\u4ed4\u7ec6\u8003\u8651\u4ee5\u4e0b\u6280\u672f\u53c2\u6570:<\/p>\n<ul>\n<li>\u9632\u62a4\u80fd\u529b:\n<ul>\n<li>\u5e26\u5bbd:500+ Gbps\u7f13\u89e3\u80fd\u529b<\/li>\n<li>\u6570\u636e\u5305\u5904\u7406:200+\u767e\u4e07PPS<\/li>\n<li>\u8fde\u63a5\u5904\u7406:30+\u767e\u4e07\u5e76\u53d1\u8fde\u63a5<\/li>\n<\/ul>\n<\/li>\n<li>\u54cd\u5e94\u6307\u6807:\n<ul>\n<li>\u6fc0\u6d3b\u65f6\u95f4:< 10\u79d2<\/li>\n<li>\u653b\u51fb\u671f\u95f4\u5ef6\u8fdf\u5f00\u9500:< 1ms<\/li>\n<li>\u8bef\u62a5\u7387:< 0.001%<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u5e94\u6025\u54cd\u5e94\u534f\u8bae<\/strong><\/h2>\n<p>\u5728\u4e3b\u52a8SYN\u6d2a\u6c34\u653b\u51fb\u671f\u95f4,\u7cfb\u7edf\u6267\u884c\u4ee5\u4e0b\u54cd\u5e94\u5e8f\u5217:<\/p>\n<ol>\n<li>\u653b\u51fb\u68c0\u6d4b\u9636\u6bb5:\n<ul>\n<li>\u6d41\u91cf\u6a21\u5f0f\u5206\u6790<\/li>\n<li>\u5f02\u5e38\u68c0\u6d4b<\/li>\n<li>\u653b\u51fb\u7279\u5f81\u8bc6\u522b<\/li>\n<\/ul>\n<\/li>\n<li>\u7f13\u89e3\u5b9e\u65bd:\n<ul>\n<li>\u52a8\u6001\u89c4\u5219\u90e8\u7f72<\/li>\n<li>\u6d41\u91cf\u91cd\u65b0\u8def\u7531<\/li>\n<li>\u8d44\u6e90\u91cd\u65b0\u5206\u914d<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2><strong>\u6027\u80fd\u4f18\u5316\u548c\u76d1\u63a7<\/strong><\/h2>\n<p>\u6301\u7eed\u76d1\u63a7\u548c\u4f18\u5316\u662f\u6709\u6548SYN\u653b\u51fb\u9632\u5fa1\u7684\u5173\u952e\u7ec4\u6210\u90e8\u5206\u3002\u7cfb\u7edf\u5b9e\u65bd:<\/p>\n<ul>\n<li>\u5b9e\u65f6\u76d1\u63a7:\n<ul>\n<li>\u7f51\u7edc\u6d41\u91cf\u5206\u6790<\/li>\n<li>\u7cfb\u7edf\u8d44\u6e90\u5229\u7528<\/li>\n<li>\u653b\u51fb\u6a21\u5f0f\u8bc6\u522b<\/li>\n<\/ul>\n<\/li>\n<li>\u6027\u80fd\u6307\u6807:\n<ul>\n<li>\u541e\u5410\u91cf\u6d4b\u91cf<\/li>\n<li>\u5ef6\u8fdf\u8ddf\u8e2a<\/li>\n<li>\u6570\u636e\u5305\u4e22\u5931\u76d1\u63a7<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u670d\u52a1\u5668\u914d\u7f6e\u6700\u4f73\u5b9e\u8df5<\/strong><\/h2>\n<p>\u4e3a\u6700\u5927\u9650\u5ea6\u5730\u63d0\u9ad8\u9999\u6e2f\u9ad8\u9632\u670d\u52a1\u5668\u79df\u7528\u89e3\u51b3\u65b9\u6848\u7684\u6709\u6548\u6027,\u8bf7\u5b9e\u65bd\u4ee5\u4e0b\u6280\u672f\u914d\u7f6e:<\/p>\n<ol>\n<li>TCP\/IP\u5806\u6808\u4f18\u5316:\n<ul>\n<li>net.ipv4.tcp_max_syn_backlog = 8192<\/li>\n<li>net.ipv4.tcp_synack_retries = 2<\/li>\n<li>net.ipv4.tcp_syn_retries = 2<\/li>\n<\/ul>\n<\/li>\n<li>\u5185\u6838\u53c2\u6570\u8c03\u4f18:\n<ul>\n<li>net.core.somaxconn = 16384<\/li>\n<li>net.ipv4.tcp_max_tw_buckets = 1440000<\/li>\n<li>net.ipv4.tcp_fin_timeout = 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