{"id":208454,"date":"2025-09-29T17:18:08","date_gmt":"2025-09-29T09:18:08","guid":{"rendered":"https:\/\/www.server.hk\/blog\/208454\/"},"modified":"2025-09-29T17:18:09","modified_gmt":"2025-09-29T09:18:09","slug":"vps-13","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/208454\/","title":{"rendered":"\u9999\u6e2fVPS\u9632\u706b\u5899\u5b9e\u6218\uff1a\u9ad8\u6548\u62b5\u5fa1DDoS\u653b\u51fb\u7684\u6700\u4f73\u65b9\u6848"},"content":{"rendered":"<p>\u5728\u5f53\u524d\u4e92\u8054\u7f51\u73af\u5883\u4e0b\uff0cDDoS\uff08\u5206\u5e03\u5f0f\u62d2\u7edd\u670d\u52a1\uff09\u653b\u51fb\u5df2\u6210\u4e3a\u5a01\u80c1\u7f51\u7ad9\u7a33\u5b9a\u6027\u548c\u4e1a\u52a1\u8fde\u7eed\u6027\u7684\u5e38\u89c1\u624b\u6bb5\u3002\u5bf9\u4e8e\u4f9d\u8d56\u9999\u6e2fVPS\u6216\u5176\u4ed6\u4e91\u4e3b\u673a\u90e8\u7f72\u4e1a\u52a1\u7684\u7ad9\u957f\u3001\u4f01\u4e1a\u4e0e\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u6784\u5efa\u4e00\u5957\u9ad8\u6548\u4e14\u53ef\u843d\u5730\u7684\u9632\u706b\u5899\u4f53\u7cfb\u81f3\u5173\u91cd\u8981\u3002\u672c\u6587\u5c06\u4ece\u539f\u7406\u3001\u5b9e\u6218\u914d\u7f6e\u3001\u5e94\u7528\u573a\u666f\u3001\u4f18\u52bf\u5bf9\u6bd4\u53ca\u9009\u8d2d\u5efa\u8bae\u7b49\u65b9\u9762\uff0c\u8be6\u7ec6\u9610\u8ff0\u5728\u9999\u6e2fVPS\u4e0a\u62b5\u5fa1DDoS\u653b\u51fb\u7684\u6700\u4f73\u65b9\u6848\uff0c\u5e76\u63d0\u4f9b\u53ef\u64cd\u4f5c\u7684\u6280\u672f\u7ec6\u8282\u3002<\/p>\n<h2>DDoS\u653b\u51fb\u539f\u7406\u4e0e\u5206\u5c42\u9632\u62a4\u601d\u8def<\/h2>\n<p>DDoS\u653b\u51fb\u6309\u653b\u51fb\u5c42\u6b21\u53ef\u5206\u4e3a\u7f51\u7edc\u5c42\uff08L3\/L4\uff09\u548c\u5e94\u7528\u5c42\uff08L7\uff09\u4e24\u7c7b\u3002\u7f51\u7edc\u5c42\u653b\u51fb\u901a\u5e38\u901a\u8fc7\u6d2a\u6cdb\u5927\u91cf\u6d41\u91cf\u6216\u8fde\u63a5\u8bf7\u6c42\u8017\u5c3d\u5e26\u5bbd\u4e0e\u8d44\u6e90\uff1b\u5e94\u7528\u5c42\u653b\u51fb\u5219\u6a21\u62df\u5408\u6cd5\u8bf7\u6c42\uff0c\u8017\u5c3d\u670d\u52a1\u5668CPU\u3001\u5185\u5b58\u6216\u5e94\u7528\u7ebf\u7a0b\u6c60\u3002<\/p>\n<h3>\u5206\u5c42\u9632\u62a4\u7684\u57fa\u672c\u539f\u5219<\/h3>\n<ul>\n<li>\u8fb9\u7f18\u4f18\u5148\uff1a\u5728\u9760\u8fd1\u6d41\u91cf\u5165\u53e3\u7684\u5730\u65b9\u62e6\u622a\u6076\u610f\u6d41\u91cf\uff0c\u51cf\u8f7b\u6e90\u670d\u52a1\u5668\u538b\u529b\u3002<\/li>\n<li>\u6d41\u91cf\u5206\u6d41\uff1a\u7ed3\u5408CDN\u3001\u4e91\u6e05\u6d17\uff08scrubbing\uff09\u4e0eBGP\u9ed1\u6d1e\u7b56\u7565\uff0c\u5148\u5728\u7f51\u7edc\u5c42\u8fc7\u6ee4\u5927\u89c4\u6a21\u653b\u51fb\u3002<\/li>\n<li>\u4e3b\u673a\u9632\u62a4\uff1a\u5728VPS\u5185\u90e8\u4f7f\u7528\u5185\u6838\u7ea7\u4e0e\u7528\u6237\u6001\u5de5\u5177\u505a\u7ec6\u7c92\u5ea6\u9632\u62a4\uff08\u5982SYN cookie\u3001conntrack\u9650\u5236\u3001iptables\/nftables\u3001fail2ban\u7b49\uff09\u3002<\/li>\n<li>\u5e94\u7528\u9650\u901f\uff1a\u5728Web\u5c42\u5b9e\u73b0\u8bf7\u6c42\u901f\u7387\u9650\u5236\u3001\u9a8c\u8bc1\u7801\u6216\u884c\u4e3a\u9a8c\u8bc1\uff0c\u9632\u6b62\u5e94\u7528\u5c42\u8017\u5c3d\u8d44\u6e90\u3002<\/li>\n<\/ul>\n<h2>\u9999\u6e2fVPS\u4e0a\u53ef\u5b9e\u65bd\u7684\u6838\u5fc3\u9632\u62a4\u6280\u672f<\/h2>\n<p>\u4ee5\u4e0b\u9488\u5bf9\u9999\u6e2fVPS\u8fd9\u7c7b\u8f7b\u91cf\u4e91\u4e3b\u673a\u7ed9\u51fa\u4e00\u5957\u53ef\u5b9e\u64cd\u7684\u6280\u672f\u6e05\u5355\u4e0e\u793a\u4f8b\u914d\u7f6e\uff0c\u9002\u7528\u4e8e\u540c\u65f6\u9700\u8981\u517c\u987e\u6027\u4ef7\u6bd4\u4e0e\u9632\u62a4\u80fd\u529b\u7684\u573a\u666f\u3002<\/p>\n<h3>1. \u5185\u6838\u7ea7\u9632\u62a4\uff1aSYN Cookies \u4e0e conntrack \u7b56\u7565<\/h3>\n<p><strong>SYN Cookies<\/strong>\u7528\u4e8e\u5e94\u5bf9\u534a\u8fde\u63a5\uff08SYN flood\uff09\u653b\u51fb\uff0c\u53ef\u5728Linux\u5185\u6838\u5f00\u542f\uff1a<\/p>\n<p><code>sysctl -w net.ipv4.tcp_syncookies=1<\/code><\/p>\n<p>\u540c\u65f6\uff0c\u9700\u8981\u8c03\u6574conntrack\u8868\u4e0e\u534a\u5f00\u8fde\u63a5\u53c2\u6570\uff0c\u907f\u514d\u8868\u8017\u5c3d\uff1a<\/p>\n<p><code><br \/>\nsysctl -w net.netfilter.nf_conntrack_max=262144<br \/>\nsysctl -w net.netfilter.nf_conntrack_tcp_timeout_synrecv=30<br \/>\n<\/code><\/p>\n<p>\u8fd9\u4e9b\u53c2\u6570\u80fd\u63d0\u9ad8VPS\u5728\u9ad8\u8fde\u63a5\u521b\u5efa\u901f\u7387\u4e0b\u7684\u7a33\u5b9a\u6027\uff0c\u4f46\u5bf9\u5927\u89c4\u6a21\u5e26\u5bbd\u6d2a\u6cdb\u5e76\u65e0\u76f4\u63a5\u6548\u679c\u3002<\/p>\n<h3>2. iptables \/ nftables + ipset\uff1a\u9ed1\u767d\u540d\u5355\u4e0e\u901f\u7387\u9650\u5236<\/h3>\n<p>\u5728\u4e3b\u673a\u5c42\u4f7f\u7528nftables\uff08\u6216\u7ecf\u5178\u7684iptables\uff09\u7ed3\u5408ipset\u5904\u7406\u5927\u91cfIP\u9ed1\u540d\u5355\u66f4\u9ad8\u6548\u3002\u793a\u4f8b\uff08nftables + ipset \u98ce\u683c\uff09\uff1a<\/p>\n<p>\u521b\u5efaipset\u96c6\u5408\u7528\u4e8e\u5b58\u50a8\u6076\u610fIP\uff1a<\/p>\n<p><code>ipset create blacklist hash:ip timeout 1h<\/code><\/p>\n<p>nftables\u89c4\u5219\u793a\u4f8b\uff08\u4f2a\u4ee3\u7801\u63cf\u8ff0\uff09\uff1a<\/p>\n<p><code><br \/>\nnft add table inet filter<br \/>\nnft add chain inet filter input { type filter hook input priority 0; }<br \/>\nnft add rule inet filter input ip saddr @blacklist drop<br \/>\nnft add rule inet filter input tcp flags syn tcp dport 80 ct state new limit rate 30\/second burst 100 accept<br \/>\n<\/code><\/p>\n<p>\u5bf9SSH\u7b49\u670d\u52a1\u53ef\u4f7f\u7528\u9650\u901f\u4e0e\u7aef\u53e3\u8df3\u8dc3\u7b56\u7565\uff0c\u5e76\u501f\u52a9fail2ban\u81ea\u52a8\u52a0\u5165ipset\uff1a<\/p>\n<p><code>fail2ban-action add <span><\/span>iptables-multiport addaction = ipset add blacklist <span><\/span><\/code><\/p>\n<h3>3. \u4f7f\u7528 rate-limiting \u4e0e TCP Stack \u4f18\u5316\uff08tc\u3001sysctl\uff09<\/h3>\n<p>\u5728\u5e26\u5bbd\u53ef\u63a7\u7684\u73af\u5883\u4e2d\uff0ctc\uff08Traffic Control\uff09\u53ef\u5bf9\u5165\u7ad9\/\u51fa\u7ad9\u505a\u7cbe\u786e\u9650\u901f\u3001\u4f18\u5148\u7ea7\u8c03\u5ea6\u4e0e\u4e22\u5305\u7b56\u7565\u3002\u4f8b\u5982\u9650\u5b9a\u6bcf\u4e2aIP\u7684\u5e76\u53d1\u8fde\u63a5\u6216\u901f\u7387\uff0c\u9632\u6b62\u5355\u70b9IP\u8017\u5c3d\u8d44\u6e90\u3002\u5e38\u89c1\u505a\u6cd5\u5305\u62ecHTB+sfq\u914d\u5408u32\u8fc7\u6ee4\u5668\u5bf9\u53ef\u7591\u6d41\u91cf\u7cbe\u786e\u9650\u901f\u3002<\/p>\n<p>\u540c\u65f6\u4f18\u5316\u5185\u6838\u7f51\u7edc\u6808\u53c2\u6570\uff1a<\/p>\n<p><code><br \/>\nsysctl -w net.ipv4.ip_local_port_range=\"1024 65535\"<br \/>\nsysctl -w net.core.somaxconn=1024<br \/>\nsysctl -w net.core.netdev_max_backlog=250000<br \/>\n<\/code><\/p>\n<h3>4. \u9ad8\u6027\u80fd\u9632\u62a4\uff1aXDP\/eBPF \u4e0e\u9632\u62a4\u8f6f\u4ef6<\/h3>\n<p>\u5bf9\u4e8e\u9ad8\u5e76\u53d1\u4e0e\u9ad8\u5305\u901f\u573a\u666f\uff0c\u53ef\u5728\u5185\u6838\u65e9\u671f\u4f7f\u7528XDP\uff08eXpress Data Path\uff09\u6216eBPF\u7a0b\u5e8f\u4e22\u5f03\u53ef\u7591\u6d41\u91cf\uff0c\u6781\u5927\u964d\u4f4eCPU\u6d88\u8017\u3002\u5e38\u7528\u5f00\u6e90\u9879\u76ee\u5305\u62ecCilium\u3001BCC\u5de5\u5177\u96c6\u548cxdp-filter\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u90e8\u5206VPS\u63d0\u4f9b\u5546\u5bf9\u5185\u6838\u6216\u7f51\u7edc\u9a71\u52a8\u7684\u652f\u6301\u6709\u9650\uff0c\u90e8\u7f72\u524d\u9700\u786e\u8ba4\u5bbf\u4e3b\u673a\u73af\u5883\u652f\u6301eBPF\/XDP\u3002<\/p>\n<h3>5. \u7f51\u7edc\u5c42\u914d\u5408\uff1aBGP\u9ed1\u6d1e\u3001\u6d41\u91cf\u6e05\u6d17\u4e0eCDN<\/h3>\n<p>\u5355\u9760VPS\u4e3b\u673a\u96be\u4ee5\u5e94\u5bf9\u5927\u89c4\u6a21\u5e26\u5bbd\u653b\u51fb\uff0c\u5fc5\u987b\u4e0e\u4e0a\u6e38\u7f51\u7edc\uff08\u5e26\u5bbd\u63d0\u4f9b\u5546\uff09\u914d\u5408\uff1a<\/p>\n<ul>\n<li>BGP\u9ed1\u6d1e\uff1a\u5f53\u68c0\u6d4b\u5230\u653b\u51fb\u65f6\u8fd0\u8425\u5546\u5c06\u76ee\u6807IP\u8def\u7531\u5230\u201c\u9ed1\u6d1e\u201d\u4ee5\u4fdd\u62a4\u6838\u5fc3\u7f51\u7edc\u3002<\/li>\n<li>\u6d41\u91cf\u6e05\u6d17\uff08scrubbing\uff09\uff1a\u5c06\u6d41\u91cf\u5f15\u5230\u6e05\u6d17\u4e2d\u5fc3\u8fc7\u6ee4\u540e\u518d\u56de\u4f20\uff0c\u9002\u7528\u4e8e\u5927\u6d41\u91cf\u653b\u51fb\u3002<\/li>\n<li>CDN\/\u53cd\u5411\u4ee3\u7406\uff1a\u5bf9\u9759\u6001\u5185\u5bb9\u4e0e\u516c\u5171\u63a5\u53e3\u7528CDN\u7f13\u5b58\uff0c\u51cf\u8f7b\u6e90\u7ad9\u538b\u529b\u3002<\/li>\n<\/ul>\n<p>\u5728\u9009\u62e9\u9999\u6e2fVPS\u65f6\uff0c\u4e86\u89e3\u4f9b\u5e94\u5546\u662f\u5426\u63d0\u4f9b\u8054\u52a8\u7684DDoS\u6e05\u6d17\u6216BGP\u9ed1\u6d1e\u54cd\u5e94\u975e\u5e38\u91cd\u8981\u3002<\/p>\n<h2>\u5e94\u7528\u573a\u666f\u4e0e\u5b9e\u8df5\u6848\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u51e0\u7c7b\u5e38\u89c1\u573a\u666f\u53ca\u5bf9\u5e94\u7684\u63a8\u8350\u7ec4\u5408\uff1a<\/p>\n<h3>\u573a\u666f\u4e00\uff1a\u4e2d\u5c0f\u578b\u7f51\u7ad9\uff08\u6d41\u91cf\u5cf0\u503c &lt; 1 Gbps\uff09<\/h3>\n<ul>\n<li>\u90e8\u7f72\u9999\u6e2fVPS\u4f5c\u4e3a\u4e3b\u673a\uff0c\u542f\u7528SYN 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vs 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