{"id":19556,"date":"2024-09-27T11:40:22","date_gmt":"2024-09-27T03:40:22","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-tw\/how-to-implement-ddos-protection-for-bare-metal-servers\/"},"modified":"2025-04-09T11:55:20","modified_gmt":"2025-04-09T03:55:20","slug":"how-to-implement-ddos-protection-for-bare-metal-servers","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-to-implement-ddos-protection-for-bare-metal-servers\/","title":{"rendered":"\u5982\u4f55\u70ba\u88f8\u6a5f\u4f3a\u670d\u5668\u5be6\u65bdDDoS\u9632\u8b77?"},"content":{"rendered":"<p>\u5728\u7576\u4eca\u7684\u6578\u4f4d\u74b0\u5883\u4e2d,<a href=\"https:\/\/www.varidata.com\/zh-tw\/server\/hk\/cn2\/\" target=\"_blank\">\u88f8\u6a5f\u4f3a\u670d\u5668<\/a>\u9762\u81e8\u8457\u65e5\u76ca\u8907\u96dc\u7684DDoS\u653b\u64ca\u3002\u672c\u7d9c\u5408\u6307\u5357\u63a2\u8a0e\u4e86\u524d\u6cbf\u9632\u8b77\u7b56\u7565,\u7d50\u5408\u786c\u9ad4\u6700\u4f73\u5316\u548c\u8edf\u9ad4\u89e3\u6c7a\u65b9\u6848,\u6253\u9020\u5f37\u5927\u7684\u9632\u79a6\u6a5f\u5236\u3002<\/p>\n<h2><strong>\u7406\u89e3\u73fe\u4ee3\u57fa\u790e\u8a2d\u65bd\u4e2d\u7684DDoS\u5a01\u8105<\/strong><\/h2>\n<p>\u73fe\u4ee3DDoS\u653b\u64ca\u5df2\u7d93\u767c\u5c55\u8d85\u8d8a\u4e86\u7c21\u55ae\u7684\u6d2a\u6c34\u653b\u64ca\u3002\u5982\u4eca\u7684\u5a01\u8105\u5305\u62ec\u8907\u96dc\u7684\u7b2c7\u5c64\u653b\u64ca\u3001TCP SYN\u6d2a\u6c34\u548cDNS\u653e\u5927\u653b\u64ca\u3002\u7531\u65bc\u76f4\u63a5\u66b4\u9732\u5728\u7db2\u8def\u4e2d,\u88f8\u6a5f\u4f3a\u670d\u5668\u7279\u5225\u5bb9\u6613\u53d7\u5230\u653b\u64ca\u3002\u8b93\u6211\u5011\u6df1\u5165\u77ad\u89e3\u9019\u4e9b\u5a01\u8105\u7684\u6280\u8853\u7d30\u7bc0\u53ca\u5176\u7de9\u89e3\u7b56\u7565\u3002<\/p>\n<h2><strong>\u786c\u9ad4\u5c64\u9762\u7684\u9632\u8b77\u63aa\u65bd<\/strong><\/h2>\n<p>\u5be6\u65bd\u786c\u9ad4\u5c64\u9762\u7684DDoS\u9632\u8b77\u59cb\u65bc\u7db2\u8def\u4ecb\u9762\u5361(NIC)\u6700\u4f73\u5316\u3002\u4ee5\u4e0b\u662f\u914d\u7f6e\u7db2\u8def\u4ecb\u9762\u4ee5\u589e\u5f37\u9632\u8b77\u7684\u5be6\u7528\u793a\u4f8b:<\/p>\n<pre><code>\r\n# \u555f\u7528\u63a5\u6536\u7aef\u64f4\u5c55(RSS)\r\nethtool -K eth0 rx-checksumming on\r\nethtool -K eth0 tx-checksumming on\r\nethtool -K eth0 scatter-gather on\r\nethtool -K eth0 tcp-segmentation-offload on\r\n\r\n# \u6700\u4f73\u5316\u7db2\u8def\u4f47\u5217\r\nethtool -G eth0 rx 4096\r\nethtool -G eth0 tx 4096\r\n\r\n# \u555f\u7528\u4e2d\u65b7\u5408\u4f75\r\nethtool -C eth0 rx-usecs 100 rx-frames 256\r\n<\/code><\/pre>\n<h2><strong>\u7db2\u8def\u5c64\u9632\u79a6\u7b56\u7565<\/strong><\/h2>\n<p>\u5be6\u65bdBGP\u9ed1\u6d1e\u548c\u6d41\u91cf\u6e05\u6d17\u9700\u8981\u8b39\u614e\u914d\u7f6e\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528iptables\u5be6\u73fe\u901f\u7387\u9650\u5236\u7684\u793a\u4f8b:<\/p>\n<pre><code>\r\n# \u9650\u5236\u50b3\u5165TCP\u9023\u7dda\u901f\u7387\r\niptables -A INPUT -p tcp --dport 80 -m state --state NEW -m limit --limit 20\/minute --limit-burst 100 -j ACCEPT\r\n\r\n# \u4e1f\u68c4\u904e\u91cf\u7684SYN\u8cc7\u6599\u5305\r\niptables -A INPUT -p tcp --syn -m limit --limit 1\/s --limit-burst 3 -j ACCEPT\r\niptables -A INPUT -p tcp --syn -j DROP\r\n\r\n# \u9632\u79a6ping\u6d2a\u6c34\u653b\u64ca\r\niptables -A INPUT -p icmp -m limit --limit 1\/s --limit-burst 1 -j ACCEPT\r\niptables -A INPUT -p icmp -j DROP\r\n<\/code><\/pre>\n<h2><strong>\u57fa\u65bc\u8edf\u9ad4\u7684\u9632\u8b77\u914d\u7f6e<\/strong><\/h2>\n<p>\u73fe\u4ee3DDoS\u9632\u8b77\u9700\u8981\u591a\u5c64\u8edf\u9ad4\u65b9\u6848\u3002\u6211\u5011\u5c07\u5be6\u65bdfail2ban\u9032\u884c\u81ea\u52d5IP\u5c01\u9396,\u4e26\u914d\u7f6e\u5177\u6709\u901f\u7387\u9650\u5236\u529f\u80fd\u7684nginx\u3002\u4ee5\u4e0b\u662f\u8a73\u7d30\u5be6\u73fe:<\/p>\n<pre><code>\r\n# Fail2ban\u7684nginx\u914d\u7f6e\r\n[nginx-req-limit]\r\nenabled = true\r\nfilter = nginx-req-limit\r\naction = iptables-multiport[name=ReqLimit, port=\"http,https\", protocol=tcp]\r\nlogpath = \/var\/log\/nginx\/error.log\r\nfindtime = 600\r\nbantime = 7200\r\nmaxretry = 10\r\n\r\n# Nginx\u901f\u7387\u9650\u5236\u914d\u7f6e\r\nhttp {\r\n    limit_req_zone $binary_remote_addr zone=one:10m rate=1r\/s;\r\n    \r\n    server {\r\n        location \/ {\r\n            limit_req zone=one burst=5 nodelay;\r\n            limit_req_status 429;\r\n        }\r\n    }\r\n}\r\n<\/code><\/pre>\n<h2><strong>\u9032\u968e\u6d41\u91cf\u5206\u6790\u548c\u7de9\u89e3<\/strong><\/h2>\n<p>\u5be6\u65bd\u5373\u6642\u6d41\u91cf\u5206\u6790\u6709\u52a9\u65bc\u5feb\u901f\u8b58\u5225\u548c\u7de9\u89e3\u653b\u64ca\u3002\u4f7f\u7528tcpdump\u548cnetstat\u9032\u884c\u6d41\u91cf\u76e3\u63a7\u53ef\u63d0\u4f9b\u5bf6\u8cb4\u7684\u898b\u89e3:<\/p>\n<pre><code>\r\n# \u76e3\u63a7TCP SYN\u8cc7\u6599\u5305\r\ntcpdump -i eth0 'tcp[tcpflags] & (tcp-syn) != 0'\r\n\r\n# \u8ffd\u8e64\u9023\u7dda\u72c0\u614b\r\nnetstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n\r\n\r\n# \u9023\u7dda\u76e3\u63a7\u7684\u81ea\u8a02Python\u6307\u4ee4\u78bc\r\nimport socket\r\nimport time\r\nfrom collections import defaultdict\r\n\r\nconnections = defaultdict(int)\r\ndef monitor_connections(port=80):\r\n    sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_TCP)\r\n    while True:\r\n        packet = sock.recvfrom(65535)\r\n        ip_header = packet[0][0:20]\r\n        src_ip = socket.inet_ntoa(ip_header[12:16])\r\n        connections[src_ip] += 1\r\n        if connections[src_ip] > 100:\r\n            print(f\"\u4f86\u81ea {src_ip} \u7684\u6f5b\u5728DDoS\u653b\u64ca\")\r\n<\/code><\/pre>\n<h2><strong>\u8ca0\u8f09\u5e73\u8861\u548c\u5206\u6563\u7b56\u7565<\/strong><\/h2>\n<p>\u5be6\u65bd\u8ca0\u8f09\u5e73\u8861\u5c0dDDoS\u7de9\u89e3\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662fHAProxy\u914d\u7f6e\u793a\u4f8b,\u7528\u65bc\u5728\u591a\u500b\u4f3a\u670d\u5668\u4e4b\u9593\u5206\u914d\u6d41\u91cf:<\/p>\n<pre><code>\r\nglobal\r\n    maxconn 50000\r\n    log \/dev\/log local0\r\n\r\ndefaults\r\n    mode    http\r\n    option  httplog\r\n    option  dontlognull\r\n    timeout connect 5000\r\n    timeout client  50000\r\n    timeout server  50000\r\n\r\nfrontend http-in\r\n    bind *:80\r\n    acl blacklisted src_conn_cur ge 100\r\n    tcp-request connection reject if blacklisted\r\n    default_backend servers\r\n\r\nbackend servers\r\n    balance roundrobin\r\n    stick-table type ip size 1m expire 30s store conn_cur\r\n    stick on src\r\n    server server1 xx.x.x.x:xx check\r\n    server server2 xx.x.x.x:xx check\r\n<\/code><\/pre>\n<h2><strong>\u5be6\u65bd\u81ea\u52d5\u56de\u61c9\u7cfb\u7d71<\/strong><\/h2>\n<p>\u81ea\u52d5\u56de\u61c9\u7cfb\u7d71\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u60a8\u7684DDoS\u9632\u8b77\u80fd\u529b\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528Python\u548cRedis\u8ffd\u8e64\u548c\u5c01\u9396\u53ef\u7591IP\u4f4d\u5740\u7684\u5be6\u7528\u5be6\u73fe:<\/p>\n<pre><code>\r\nimport redis\r\nfrom datetime import datetime\r\nimport subprocess\r\n\r\nclass DDOSDetector:\r\n    def __init__(self):\r\n        self.redis_client = redis.Redis(host='localhost', port=6379, db=0)\r\n        self.threshold = 100\r\n        self.window = 60  # \u79d2\r\n\r\n    def track_request(self, ip_address):\r\n        current_time = datetime.now().timestamp()\r\n        pipe = self.redis_client.pipeline()\r\n        \r\n        # \u5c07\u8acb\u6c42\u52a0\u5165\u6ed1\u52d5\u8996\u7a97\r\n        pipe.zadd(f'requests:{ip_address}', {current_time: current_time})\r\n        pipe.zremrangebyscore(f'requests:{ip_address}', \r\n                             0, current_time - self.window)\r\n        pipe.zcard(f'requests:{ip_address}')\r\n        \r\n        _, _, request_count = pipe.execute()\r\n        \r\n        if request_count > self.threshold:\r\n            self.block_ip(ip_address)\r\n    \r\n    def block_ip(self, ip_address):\r\n        command = f'iptables -A INPUT -s {ip_address} -j DROP'\r\n        subprocess.run(command.split())\r\n<\/code><\/pre>\n<h2><strong>\u6548\u80fd\u76e3\u63a7\u548c\u7cfb\u7d71\u6700\u4f73\u5316<\/strong><\/h2>\n<p>\u5b9a\u671f\u6548\u80fd\u76e3\u63a7\u5c0d\u7dad\u6301\u6709\u6548\u7684DDoS\u9632\u8b77\u81f3\u95dc\u91cd\u8981\u3002\u8003\u616e\u5be6\u65bd\u4ee5\u4e0b\u76e3\u63a7\u6307\u4ee4\u78bc:<\/p>\n<pre><code>\r\n#!\/bin\/bash\r\n\r\n# \u7cfb\u7d71\u8cc7\u6e90\u76e3\u63a7\r\nwhile true; do\r\n    echo \"=== \u7cfb\u7d71\u72c0\u614b $(date) ===\"\r\n    echo \"CPU\u4f7f\u7528\u7387:\"\r\n    mpstat 1 1 | grep -A 5 \"%idle\" | tail -n 1\r\n    \r\n    echo \"\u8a18\u61b6\u9ad4\u4f7f\u7528\u7387:\"\r\n    free -m | grep Mem\r\n    \r\n    echo \"\u7db2\u8def\u9023\u7dda:\"\r\n    netstat -ant | awk '{print $6}' | sort | uniq -c\r\n    \r\n    echo \"\u76ee\u524d\u5df2\u5c01\u9396IP:\"\r\n    iptables -L INPUT -n -v | grep DROP\r\n    \r\n    sleep 60\r\ndone\r\n<\/code><\/pre>\n<h2><strong>\u6700\u4f73\u5be6\u52d9\u548c\u672a\u4f86\u8003\u91cf<\/strong><\/h2>\n<p>\u5728\u70ba\u88f8\u6a5f\u4f3a\u670d\u5668\u5be6\u65bdDDoS\u9632\u8b77\u6642,\u8acb\u8003\u616e\u4ee5\u4e0b\u95dc\u9375\u56e0\u7d20:<\/p>\n<ul>\n<li>\u5b9a\u671f\u5b89\u5168\u7a3d\u6838\u548c\u6ef2\u900f\u6e2c\u8a66<\/li>\n<li>\u6301\u7e8c\u76e3\u63a7\u548c\u7cfb\u7d71\u66f4\u65b0<\/li>\n<li>\u57fa\u790e\u8a2d\u65bd\u53ef\u64f4\u5c55\u6027\u898f\u5283<\/li>\n<li>\u7dca\u6025\u61c9\u8b8a\u5354\u5b9a\u5236\u5b9a<\/li>\n<\/ul>\n<p>DDoS\u9632\u8b77\u7684\u672a\u4f86\u767c\u5c55\u53ef\u80fd\u6703\u878d\u5165\u6a5f\u5668\u5b78\u7fd2\u548c\u4eba\u5de5\u667a\u6167\u9a45\u52d5\u7684\u6aa2\u6e2c\u7cfb\u7d71\u3002\u8acb\u6301\u7e8c\u95dc\u6ce8\u65b0\u8208\u6280\u8853\u4e26\u5b9a\u671f\u66f4\u65b0\u60a8\u7684\u9632\u8b77\u7b56\u7565\u3002<\/p>\n<h2><strong>\u7d50\u8ad6<\/strong><\/h2>\n<p>\u4fdd\u8b77\u88f8\u6a5f\u4f3a\u670d\u5668\u514d\u53d7DDoS\u653b\u64ca\u9700\u8981\u7d9c\u5408\u65b9\u6cd5,\u7d50\u5408\u786c\u9ad4\u6700\u4f73\u5316\u3001\u8edf\u9ad4\u914d\u7f6e\u548c\u4e3b\u52d5\u76e3\u63a7\u3002\u900f\u904e\u5be6\u65bd\u672c\u6307\u5357\u4e2d\u8a73\u8ff0\u7684\u89e3\u6c7a\u65b9\u6848,\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u4f3a\u670d\u5668\u62b5\u79a6DDoS\u5a01\u8105\u7684\u80fd\u529b\u3002\u8acb\u8a18\u4f4f\u5b9a\u671f\u5be9\u67e5\u548c\u66f4\u65b0\u60a8\u7684\u9632\u8b77\u63aa\u65bd,\u4ee5\u61c9\u5c0d\u4e0d\u65b7\u767c\u5c55\u7684\u5b89\u5168\u6311\u6230\u3002<\/p>\n<p>\u70ba\u4e86\u6700\u4f73\u4fdd\u8b77\u60a8\u7684\u88f8\u6a5f\u4f3a\u670d\u5668\u79df\u7528\u57fa\u790e\u8a2d\u65bd,\u8acb\u8003\u616e\u5c07\u9019\u4e9b\u5b89\u5168\u63aa\u65bd\u4f5c\u70ba\u66f4\u5ee3\u6cdb\u5b89\u5168\u7b56\u7565\u7684\u4e00\u90e8\u5206,\u5176\u4e2d\u5305\u62ec\u5b9a\u671f\u66f4\u65b0\u3001\u76e3\u63a7\u548c\u61c9\u8b8a\u8a08\u756b\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u7576\u4eca\u7684\u6578\u4f4d\u74b0\u5883\u4e2d,\u88f8\u6a5f\u4f3a\u670d\u5668\u9762\u81e8\u8457\u65e5\u76ca\u8907\u96dc\u7684DDoS\u653b\u64ca\u3002\u672c\u7d9c\u5408\u6307\u5357\u63a2\u8a0e\u4e86\u524d\u6cbf\u9632\u8b77\u7b56\u7565,\u7d50\u5408\u786c\u9ad4\u6700\u4f73\u5316\u548c\u8edf\u9ad4 [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-to-implement-ddos-protection-for-bare-metal-servers\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":11,"featured_media":19551,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[267],"tags":[],"class_list":["post-19556","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-tc"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5982\u4f55\u70ba\u88f8\u6a5f\u4f3a\u670d\u5668\u5be6\u65bdDDoS\u9632\u8b77?<\/title>\n<meta name=\"description\" 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