{"id":21026,"date":"2024-12-26T08:00:38","date_gmt":"2024-12-26T00:00:38","guid":{"rendered":"https:\/\/www.simcentric.com\/?p=21026"},"modified":"2024-12-23T14:39:21","modified_gmt":"2024-12-23T06:39:21","slug":"how-to-maintain-us-anti-ddos-servers","status":"publish","type":"post","link":"https:\/\/www.simcentric.com\/sc\/america-dedicated-server-sc\/how-to-maintain-us-anti-ddos-servers\/","title":{"rendered":"\u5982\u4f55\u7ef4\u62a4\u7f8e\u56fd\u9632DDoS\u670d\u52a1\u5668\uff1f"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text css=””]<\/p>\n

\u7406\u89e3\u9632DDoS\u670d\u52a1\u5668\u57fa\u7840\u8bbe\u65bd<\/strong><\/h2>\n

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\u57fa\u672c\u7cfb\u7edf\u76d1\u63a7\u8bbe\u7f6e<\/strong><\/h2>\n

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\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\u5e94\u8be5\u901a\u8fc7\u81ea\u5b9a\u4e49\u68c0\u67e5\u6765\u589e\u5f3a\uff0c\u5305\u62ec\u8fde\u63a5\u8ddf\u8e2a\u8868\u5927\u5c0f\u3001SYN cookie\u6709\u6548\u6027\u548c\u5e26\u5bbd\u4f7f\u7528\u6a21\u5f0f\u3002\u76d1\u63a7\u8fd9\u4e9b\u6307\u6807\u6709\u52a9\u4e8e\u5728DDoS\u653b\u51fb\u5f71\u54cd\u670d\u52a1\u53ef\u7528\u6027\u4e4b\u524d\u8bc6\u522b\u6f5c\u5728\u7684\u653b\u51fb\u3002<\/p>\n
DDoS\u9632\u62a4\u5c42\u914d\u7f6e<\/strong><\/h2>\n
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\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
\u6027\u80fd\u4f18\u5316\u6280\u672f<\/strong><\/h2>\n
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\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
\u9ad8\u7ea7\u6d41\u91cf\u5206\u6790\u548c\u54cd\u5e94<\/strong><\/h2>\n
\u5b9e\u65bd\u590d\u6742\u7684\u6d41\u91cf\u5206\u6790\u5de5\u5177\u80fd\u591f\u5feb\u901f\u68c0\u6d4b\u548c\u54cd\u5e94\u6f5c\u5728\u5a01\u80c1\u3002\u73b0\u4ee3\u9632DDoS\u670d\u52a1\u5668\u5229\u7528\u673a\u5668\u5b66\u4e60\u7b97\u6cd5\u6765\u8bc6\u522b\u653b\u51fb\u6a21\u5f0f\u5e76\u81ea\u52a8\u8c03\u6574\u4fdd\u62a4\u53c2\u6570\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528ELK Stack\u7684\u9ad8\u7ea7\u65e5\u5fd7\u914d\u7f6e\u793a\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\u52a8\u5b89\u5168\u54cd\u5e94\u534f\u8bae<\/strong><\/h2>\n
\u5f00\u53d1\u81ea\u52a8\u54cd\u5e94\u673a\u5236\u5bf9\u4e8e\u5728\u653b\u51fb\u671f\u95f4\u7ef4\u6301\u670d\u52a1\u5668\u53ef\u7528\u6027\u81f3\u5173\u91cd\u8981\u3002\u8fd9\u5305\u62ec\u667a\u80fd\u6d41\u91cf\u8fc7\u6ee4\u3001\u52a8\u6001\u8d44\u6e90\u5206\u914d\u548c\u81ea\u52a8\u4e8b\u4ef6\u62a5\u544a\u3002\u4ee5\u4e0b\u662f\u589e\u5f3a\u7248\u7684\u4e8b\u4ef6\u54cd\u5e94\u811a\u672c\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
\u7ed3\u8bba<\/strong><\/h2>\n
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