{"id":21025,"date":"2024-12-26T08:00:38","date_gmt":"2024-12-26T00:00:38","guid":{"rendered":"https:\/\/www.simcentric.com\/?p=21025"},"modified":"2024-12-23T14:38:03","modified_gmt":"2024-12-23T06:38:03","slug":"how-to-maintain-us-anti-ddos-servers","status":"publish","type":"post","link":"https:\/\/www.simcentric.com\/tc\/america-dedicated-server-tc\/how-to-maintain-us-anti-ddos-servers\/","title":{"rendered":"\u5982\u4f55\u7dad\u8b77\u7f8e\u570b\u9632DDoS\u4f3a\u670d\u5668\uff1f"},"content":{"rendered":"

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\u7406\u89e3\u9632DDoS\u4f3a\u670d\u5668\u57fa\u790e\u8a2d\u65bd<\/strong><\/h2>\n

\u7dad\u8b77\u7f8e\u570b\u9632DDoS\u4f3a\u670d\u5668<\/a>\u9700\u8981\u5728\u786c\u9ad4\u57fa\u790e\u8a2d\u65bd\u548c\u5b89\u5168\u5354\u5b9a\u65b9\u9762\u5177\u5099\u6df1\u539a\u7684\u6280\u8853\u5c08\u9577\u3002\u9019\u4e9b\u9ad8\u6548\u80fd\u6a5f\u5668\u901a\u5e38\u90e8\u7f72\u5728\u7f8e\u570b\u4e3b\u8981\u57ce\u5e02\u5730\u5340\u7684\u4e00\u7d1a\u8cc7\u6599\u4e2d\u5fc3\uff0c\u69cb\u6210\u4e86\u73fe\u4ee3DDoS\u9632\u8b77\u670d\u52d9\u7684\u6838\u5fc3\u3002\u900f\u904e\u591a\u5e74\u8207\u9632DDoS\u4f3a\u670d\u5668\u79df\u7528\u89e3\u6c7a\u65b9\u6848<\/a>\u7684\u5be6\u52d9\u7d93\u9a57\uff0c\u6211\u767c\u73fe\u6070\u7576\u7684\u7dad\u8b77\u4e0d\u50c5\u50c5\u662f\u4fdd\u6301\u4f3a\u670d\u5668\u904b\u4f5c\uff0c\u66f4\u91cd\u8981\u7684\u662f\u91dd\u5c0d\u4e0d\u65b7\u6f14\u8b8a\u7684\u7db2\u8def\u5a01\u8105\u6700\u4f73\u5316\u5176\u9632\u79a6\u80fd\u529b\u3002\u73fe\u4ee3\u9632DDoS\u57fa\u790e\u8a2d\u65bd\u7d50\u5408\u4e86\u57fa\u65bc\u786c\u9ad4\u7684\u904e\u6ffe\u3001\u667a\u6167\u6d41\u91cf\u5206\u6790\u548c\u5206\u6563\u5f0f\u6e05\u6d17\u4e2d\u5fc3\uff0c\u4ee5\u5728\u906d\u53d7\u653b\u64ca\u6642\u4fdd\u6301\u670d\u52d9\u53ef\u7528\u6027\u3002<\/p>\n

\u9632DDoS\u4f3a\u670d\u5668\u7684\u6548\u679c\u5728\u5f88\u5927\u7a0b\u5ea6\u4e0a\u53d6\u6c7a\u65bc\u5176\u5728\u7db2\u8def\u62d3\u64b2\u4e2d\u7684\u4f4d\u7f6e\u3002\u7f8e\u570b\u7684\u4f3a\u670d\u5668\u5f97\u76ca\u65bc\u9760\u8fd1\u4e3b\u8981\u7db2\u969b\u7db2\u8def\u4ea4\u63db\u4e2d\u5fc3\u548c\u4e00\u7d1a\u7db2\u8def\u4f9b\u61c9\u5546\uff0c\u80fd\u5920\u5be6\u73fe\u66f4\u5feb\u7684\u56de\u61c9\u6642\u9593\u548c\u66f4\u9ad8\u6548\u7684\u6d41\u91cf\u6e05\u6d17\u3002\u900f\u904e\u6700\u4f73\u5316\u8def\u7531\u914d\u7f6e\u548c\u66f4\u65b0\u5a01\u8105\u60c5\u5831\u6574\u5408\uff0c\u5b9a\u671f\u7dad\u8b77\u78ba\u4fdd\u9019\u4e9b\u512a\u52e2\u5f97\u5230\u5145\u5206\u5229\u7528\u3002<\/p>\n

\u57fa\u672c\u7cfb\u7d71\u76e3\u63a7\u8a2d\u5b9a<\/strong><\/h2>\n

\u5be6\u65bd\u5168\u9762\u7684\u76e3\u63a7\u5c0d\u65bc\u7dad\u8b77\u9632DDoS\u4f3a\u670d\u5668\u6548\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u9664\u4e86\u57fa\u672c\u7684\u4f3a\u670d\u5668\u6307\u6a19\u5916\uff0c\u9084\u9700\u8981\u91dd\u5c0dDDoS\u7279\u5b9a\u6307\u6a19\u9032\u884c\u5c08\u9580\u76e3\u63a7\u3002\u9019\u5305\u62ec\u6d41\u91cf\u6a21\u5f0f\u5206\u6790\u3001\u9023\u7dda\u72c0\u614b\u8ffd\u8e64\u548c\u8cc7\u6e90\u5229\u7528\u7387\u76e3\u63a7\u3002\u8b93\u6211\u5011\u4f86\u770b\u4e00\u500b\u6db5\u84cb\u9019\u4e9b\u57fa\u672c\u65b9\u9762\u7684Nagios\u914d\u7f6e\uff1a<\/p>\n

\r\ndefine host {\r\n    use                     linux-server\r\n    host_name               anti-ddos-1\r\n    alias                   Primary Anti-DDoS Server\r\n    address                 10.0.0.1\r\n    check_command           check-host-alive\r\n    max_check_attempts      5\r\n    check_interval          5\r\n}\r\n\r\ndefine service {\r\n    use                     generic-service\r\n    host_name               anti-ddos-1\r\n    service_description     PING\r\n    check_command           check_ping!100.0,20%!500.0,60%\r\n}\r\n<\/code><\/pre>\n
\u6b64\u914d\u7f6e\u61c9\u8a72\u900f\u904e\u81ea\u8a02\u6aa2\u67e5\u4f86\u589e\u5f37\uff0c\u5305\u62ec\u9023\u7dda\u8ffd\u8e64\u8868\u5927\u5c0f\u3001SYN cookie\u6709\u6548\u6027\u548c\u983b\u5bec\u4f7f\u7528\u6a21\u5f0f\u3002\u76e3\u63a7\u9019\u4e9b\u6307\u6a19\u6709\u52a9\u65bc\u5728DDoS\u653b\u64ca\u5f71\u97ff\u670d\u52d9\u53ef\u7528\u6027\u4e4b\u524d\u8b58\u5225\u6f5b\u5728\u7684\u653b\u64ca\u3002<\/p>\n
DDoS\u9632\u8b77\u5c64\u914d\u7f6e<\/strong><\/h2>\n
\u591a\u5c64\u9632DDoS\u4fdd\u8b77\u65b9\u6cd5\u5c0d\u65bc\u6709\u6548\u9632\u79a6\u81f3\u95dc\u91cd\u8981\u3002\u9019\u5305\u62ec\u7db2\u8def\u5c64\u904e\u6ffe\u3001\u61c9\u7528\u5c64\u4fdd\u8b77\u548c\u901f\u7387\u9650\u5236\u6a5f\u5236\u3002\u73fe\u4ee3\u9632DDoS\u4f3a\u670d\u5668\u63a1\u7528TCP SYN cookies\u3001\u9023\u7dda\u8ffd\u8e64\u548c\u667a\u6167\u901f\u7387\u9650\u5236\u7b49\u9032\u968e\u6280\u8853\u3002\u4ee5\u4e0b\u662f\u5be6\u73fe\u9019\u4e9b\u4fdd\u8b77\u7684\u52a0\u56fa\u7248iptables\u914d\u7f6e\uff1a<\/p>\n
\r\n# Drop invalid packets\r\niptables -t mangle -A PREROUTING -m conntrack --ctstate INVALID -j DROP\r\n\r\n# Rate limit HTTP\/HTTPS connections\r\niptables -A INPUT -p tcp --dport 80 -m limit --limit 25\/minute --limit-burst 100 -j ACCEPT\r\niptables -A INPUT -p tcp --dport 443 -m limit --limit 25\/minute --limit-burst 100 -j ACCEPT\r\n\r\n# SYN flood protection\r\niptables -A INPUT -p tcp --syn -m limit --limit 1\/second -j ACCEPT\r\n\r\n# Add additional layer 7 protection\r\niptables -A INPUT -p tcp -m multiport --dports 80,443 -m hashlimit \\\r\n    --hashlimit-above 200\/sec \\\r\n    --hashlimit-burst 1000 \\\r\n    --hashlimit-mode srcip \\\r\n    --hashlimit-name http_conn \\\r\n    -j DROP\r\n<\/code><\/pre>\n
\u6548\u80fd\u6700\u4f73\u5316\u6280\u8853<\/strong><\/h2>\n
\u4f3a\u670d\u5668\u6548\u80fd\u6700\u4f73\u5316\u5c0d\u65bc\u8655\u7406\u5927\u5bb9\u91cf\u6d41\u91cf\u548c\u5728\u653b\u64ca\u671f\u9593\u4fdd\u6301\u56de\u61c9\u80fd\u529b\u81f3\u95dc\u91cd\u8981\u3002\u9019\u6d89\u53ca\u6838\u5fc3\u7d1a\u8abf\u6821\u548c\u61c9\u7528\u5c64\u6700\u4f73\u5316\u3002\u95dc\u9375\u9818\u57df\u5305\u62ecTCP\u5806\u758a\u6700\u4f73\u5316\u3001\u7db2\u8def\u7de9\u885d\u5340\u5927\u5c0f\u8abf\u6574\u548c\u9023\u7dda\u8655\u7406\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u589e\u5f37\u7248\u7684sysctl\u914d\u7f6e\uff1a<\/p>\n
\r\n# Increase TCP max backlog\r\nnet.core.netdev_max_backlog = 65535\r\n\r\n# Enable TCP window scaling\r\nnet.ipv4.tcp_window_scaling = 1\r\n\r\n# Increase TCP buffer limits\r\nnet.core.rmem_max = 67108864\r\nnet.core.wmem_max = 67108864\r\n\r\n# Optimize TCP keepalive settings\r\nnet.ipv4.tcp_keepalive_time = 1200\r\nnet.ipv4.tcp_keepalive_intvl = 30\r\nnet.ipv4.tcp_keepalive_probes = 3\r\n\r\n# Enhance SYN flood protection\r\nnet.ipv4.tcp_max_syn_backlog = 65536\r\nnet.ipv4.tcp_syncookies = 1\r\n<\/code><\/pre>\n
\u9032\u968e\u6d41\u91cf\u5206\u6790\u548c\u56de\u61c9<\/strong><\/h2>\n
\u5be6\u65bd\u8907\u96dc\u7684\u6d41\u91cf\u5206\u6790\u5de5\u5177\u80fd\u5920\u5feb\u901f\u5075\u6e2c\u548c\u56de\u61c9\u6f5b\u5728\u5a01\u8105\u3002\u73fe\u4ee3\u9632DDoS\u4f3a\u670d\u5668\u5229\u7528\u6a5f\u5668\u5b78\u7fd2\u6f14\u7b97\u6cd5\u4f86\u8b58\u5225\u653b\u64ca\u6a21\u5f0f\u4e26\u81ea\u52d5\u8abf\u6574\u4fdd\u8b77\u53c3\u6578\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528ELK Stack\u7684\u9032\u968e\u65e5\u8a8c\u914d\u7f6e\u7bc4\u4f8b\uff1a<\/p>\n
\r\ninput {\r\n  file {\r\n    path => \"\/var\/log\/nginx\/access.log\"\r\n    type => \"nginx-access\"\r\n  }\r\n  beats {\r\n    port => 5044\r\n    type => \"netflow\"\r\n  }\r\n}\r\nfilter {\r\n  grok {\r\n    match => { \"message\" => \"%{COMBINEDAPACHELOG}\" }\r\n  }\r\n  geoip {\r\n    source => \"clientip\"\r\n  }\r\n}\r\noutput {\r\n  elasticsearch {\r\n    hosts => [\"localhost:9200\"]\r\n    index => \"security-analytics-%{+YYYY.MM.dd}\"\r\n  }\r\n}\r\n<\/code><\/pre>\n
\u81ea\u52d5\u5b89\u5168\u56de\u61c9\u5354\u5b9a<\/strong><\/h2>\n
\u958b\u767c\u81ea\u52d5\u56de\u61c9\u6a5f\u5236\u5c0d\u65bc\u5728\u653b\u64ca\u671f\u9593\u7dad\u6301\u4f3a\u670d\u5668\u53ef\u7528\u6027\u81f3\u95dc\u91cd\u8981\u3002\u9019\u5305\u62ec\u667a\u6167\u6d41\u91cf\u904e\u6ffe\u3001\u52d5\u614b\u8cc7\u6e90\u5206\u914d\u548c\u81ea\u52d5\u4e8b\u4ef6\u5831\u544a\u3002\u4ee5\u4e0b\u662f\u589e\u5f37\u7248\u7684\u4e8b\u4ef6\u56de\u61c9\u6307\u4ee4\u78bc\uff1a<\/p>\n
\r\n#!\/bin\/bash\r\n# Advanced DDoS mitigation script\r\n\r\n# Configuration\r\nTHRESHOLD=1000\r\nLOG_FILE=\"\/var\/log\/ddos_incidents.log\"\r\nNOTIFICATION_EMAIL=\"admin@example.com\"\r\n\r\n# Monitor connections per IP\r\nsuspicious_ips=$(netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -nr | head -n 10)\r\n\r\nwhile read connections ip; do\r\n    if [ \"$connections\" -gt \"$THRESHOLD\" ]; then\r\n        # Block IP using ipset for better performance\r\n        ipset add blacklist $ip timeout 3600\r\n        \r\n        # Log incident\r\n        echo \"$(date) - Blocked $ip - $connections connections detected\" >> $LOG_FILE\r\n        \r\n        # Send notification\r\n        mail -s \"DDoS Alert: IP $ip blocked\" $NOTIFICATION_EMAIL\r\n    fi\r\ndone <<< \"$suspicious_ips\"\r\n<\/code><\/pre>\n
\u7d50\u8ad6<\/strong><\/h2>\n
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[vc_row][vc_column][vc_column_text css=””]  […]<\/p>\n
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