{"id":209312,"date":"2025-09-30T08:15:11","date_gmt":"2025-09-30T00:15:11","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209312\/"},"modified":"2025-09-30T08:15:12","modified_gmt":"2025-09-30T00:15:12","slug":"vps-iptables","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209312\/","title":{"rendered":"\u9999\u6e2fVPS\u5b9e\u6218\uff1a\u7528iptables\u5b9e\u73b0\u9ad8\u6548\u7f51\u7edc\u9694\u79bb\u4e0e\u8bbf\u95ee\u63a7\u5236"},"content":{"rendered":"<h2>\u5f15\u8a00<\/h2>\n<p>\u5728\u4e91\u8ba1\u7b97\u4e0e\u5206\u5e03\u5f0f\u90e8\u7f72\u65e5\u76ca\u666e\u53ca\u7684\u4eca\u5929\uff0cVPS\uff08\u865a\u62df\u79c1\u6709\u670d\u52a1\u5668\uff09\u627f\u8f7d\u7740\u5927\u91cf\u4e1a\u52a1\u6d41\u91cf\u548c\u670d\u52a1\u3002\u5bf9\u4e8e\u4f4d\u4e8e\u4e9a\u6d32\u67a2\u7ebd\u7684\u9999\u6e2fVPS\uff0c\u826f\u597d\u7684\u7f51\u7edc\u9694\u79bb\u4e0e\u8bbf\u95ee\u63a7\u5236\u7b56\u7565\u4e0d\u4ec5\u80fd\u63d0\u5347\u5b89\u5168\u6027\uff0c\u8fd8\u80fd\u4f18\u5316\u591a\u79df\u6237\u73af\u5883\u3001\u4fdd\u969c\u5408\u89c4\u8981\u6c42\u4ee5\u53ca\u63d0\u9ad8\u8fd0\u7ef4\u6548\u7387\u3002\u672c\u6587\u4ee5\u5b9e\u9645\u53ef\u64cd\u4f5c\u7684\u65b9\u5f0f\uff0c\u4ecb\u7ecd\u5982\u4f55\u5728\u9999\u6e2fVPS\u4e0a\u5229\u7528<strong>iptables<\/strong>\u6784\u5efa\u9ad8\u6548\u7684\u7f51\u7edc\u9694\u79bb\u4e0e\u8bbf\u95ee\u63a7\u5236\u4f53\u7cfb\uff0c\u7ed3\u5408\u5b9e\u9645\u573a\u666f\u548c\u9009\u578b\u5efa\u8bae\uff0c\u5e2e\u52a9\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\u5feb\u901f\u4e0a\u624b\u5e76\u5f62\u6210\u53ef\u590d\u7528\u7684\u9632\u62a4\u7b56\u7565\u3002<\/p>\n<h2>iptables \u539f\u7406\u6982\u8ff0<\/h2>\n<p>iptables \u662f Linux \u5185\u6838\u4e2d\u7684\u7528\u6237\u7a7a\u95f4\u5de5\u5177\uff0c\u4e3a netfilter \u63d0\u4f9b\u89c4\u5219\u7ba1\u7406\u3002\u5176\u6838\u5fc3\u6982\u5ff5\u5305\u62ec\u8868\uff08filter\u3001nat\u3001mangle\u3001raw\uff09\u3001\u94fe\uff08INPUT\u3001OUTPUT\u3001FORWARD\u3001PREROUTING\u3001POSTROUTING\uff09\u4ee5\u53ca\u89c4\u5219\uff08\u5339\u914d\u6761\u4ef6\u4e0e\u76ee\u6807\uff09\u3002\u5728 VPS \u573a\u666f\u4e0b\uff0c\u5e38\u7528\u7684\u8868\u4e0e\u94fe\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>filter \u8868\uff1a\u9ed8\u8ba4\u7528\u4e8e\u5305\u8fc7\u6ee4\u3002\u4e3b\u8981\u94fe\u4e3a INPUT\uff08\u76ee\u6807\u4e3a\u672c\u673a\u7684\u5305\uff09\u3001OUTPUT\uff08\u672c\u673a\u53d1\u51fa\u7684\u5305\uff09\u548c FORWARD\uff08\u7ecf\u8fc7\u672c\u673a\u7684\u5305\uff09\u3002<\/li>\n<li>nat \u8868\uff1a\u7528\u4e8e\u5730\u5740\u8f6c\u6362\uff0c\u5e38\u7528\u4e8e\u7aef\u53e3\u6620\u5c04\uff0c\u94fe\u4e3a PREROUTING\u3001POSTROUTING\u3001OUTPUT\u3002<\/li>\n<li>mangle \u8868\uff1a\u7528\u4e8e\u4fee\u6539\u5305\u5934\uff0c\u5982\u8bbe\u7f6e TOS\u3001MARK \u7b49\u3002<\/li>\n<\/ul>\n<p>\u7406\u89e3\u4e0a\u8ff0\u7ed3\u6784\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u6784\u5efa\u94fe\u7b56\u7565\u6765\u5b9e\u73b0\u7cbe\u7ec6\u7684\u8bbf\u95ee\u63a7\u5236\u4e0e\u7f51\u7edc\u9694\u79bb\u3002\u4f8b\u5982\u5728\u591a\u79df\u6237\u73af\u5883\u4e0b\uff0c\u53ef\u7ed3\u5408 FORWARD \u94fe\u4e0e\u6865\u63a5\uff08bridge\uff09\u6216\u72ec\u7acb\u865a\u62df\u7f51\u5361\u6765\u9650\u5236\u79df\u6237\u95f4\u901a\u4fe1\uff1b\u5728\u5355\u53f0 VPS \u4e0a\uff0c\u53ef\u4f7f\u7528 INPUT \u94fe\u9650\u5236\u5916\u90e8\u8bbf\u95ee\u7279\u5b9a\u670d\u52a1\u7aef\u53e3\u3002<\/p>\n<h2>\u5b9e\u6218\u573a\u666f\u4e0e\u914d\u7f6e\u793a\u4f8b<\/h2>\n<h3>\u573a\u666f\u4e00\uff1a\u5bf9\u5916\u670d\u52a1\u7684\u6700\u5c0f\u66b4\u9732\u7b56\u7565<\/h3>\n<p>\u76ee\u6807\uff1a\u53ea\u5141\u8bb8 HTTP\/HTTPS\uff0880\/443\uff09\u4e0e SSH\uff0822\uff09\u4ece\u4fe1\u4efb IP \u6bb5\u8bbf\u95ee\uff0c\u5176\u4ed6\u5165\u7ad9\u6d41\u91cf\u9ed8\u8ba4\u62d2\u7edd\u3002<\/p>\n<p>\u601d\u8def\uff1a\u5148\u5c06\u9ed8\u8ba4\u7b56\u7565\u8bbe\u7f6e\u4e3a\u62d2\u7edd\uff0c\u7136\u540e\u9010\u6761\u653e\u884c\u9700\u8981\u7684\u6d41\u91cf\uff0c\u5e76\u8bb0\u5f55\u53ef\u7591\u8fde\u63a5\u3002<\/p>\n<p>\u5b9e\u73b0\u6b65\u9aa4\uff08\u5728\u9999\u6e2fVPS\u4e0a\u6267\u884c\uff09\uff1a<\/p>\n<ul>\n<li>\u8bbe\u7f6e\u9ed8\u8ba4\u7b56\u7565\u4e3a DROP\uff1aiptables -P INPUT DROP; iptables -P FORWARD DROP; iptables -P OUTPUT ACCEPT<\/li>\n<li>\u5141\u8bb8\u56de\u73af\u63a5\u53e3\u4e0e\u5df2\u5efa\u7acb\/\u76f8\u5173\u8fde\u63a5\uff1aiptables -A INPUT -i lo -j ACCEPT; iptables -A INPUT -m conntrack &#8211;ctstate ESTABLISHED,RELATED -j ACCEPT<\/li>\n<li>\u653e\u884c HTTP\/HTTPS\uff1aiptables -A INPUT -p tcp &#8211;dport 80 -j ACCEPT; iptables -A INPUT -p tcp &#8211;dport 443 -j ACCEPT<\/li>\n<li>\u9650\u5236 SSH \u4ec5\u5141\u8bb8\u7279\u5b9a\u7ba1\u7406 IP\uff1aiptables -A INPUT -p tcp -s 203.0.113.5 &#8211;dport 22 -j ACCEPT<\/li>\n<li>\u8bb0\u5f55\u5e76\u62d2\u7edd\u5176\u4ed6\u6d41\u91cf\uff1aiptables -A INPUT -m limit &#8211;limit 5\/min -j LOG &#8211;log-prefix &#8220;IPTables-Dropped: &#8220;; iptables -A INPUT -j DROP<\/li>\n<\/ul>\n<p>\u8bf4\u660e\uff1a\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\uff0c\u5e94\u5148\u5728\u4f1a\u8bdd\u4e2d\u5f00\u542f\u4e00\u4e2a\u4e34\u65f6\u89c4\u5219\u4ee5\u9632 SSH \u88ab\u9501\u6b7b\uff0c\u6216\u4f7f\u7528\u5c4f\u5e55\/\u63a7\u5236\u53f0\u4fdd\u8bc1\u53ef\u56de\u6eda\u3002<\/p>\n<h3>\u573a\u666f\u4e8c\uff1a\u79df\u6237\u95f4\u7f51\u7edc\u9694\u79bb\uff08\u6865\u63a5\u6216\u8def\u7531\u73af\u5883\uff09<\/h3>\n<p>\u76ee\u6807\uff1a\u5728\u540c\u4e00\u9999\u6e2f\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\u591a\u4e2a\u670d\u52a1\u5b9e\u4f8b\u6216\u5bb9\u5668\uff0c\u7981\u6b62\u4e0d\u540c\u79df\u6237\u5b50\u7f51\u4e4b\u95f4\u76f4\u63a5\u901a\u4fe1\uff0c\u4f46\u5141\u8bb8\u901a\u8fc7\u7f51\u5173\u8bbf\u95ee\u5916\u7f51\u548c\u7279\u5b9a\u5185\u90e8\u5171\u4eab\u670d\u52a1\u3002<\/p>\n<p>\u601d\u8def\uff1a\u4e3a\u6bcf\u4e2a\u79df\u6237\u5206\u914d\u72ec\u7acb\u5b50\u7f51\u6216\u865a\u62df\u7f51\u5361\uff0c\u901a\u8fc7 FORWARD \u94fe\u548c iptables mark\/route \u6216\u4f7f\u7528\u72ec\u7acb\u7684\u865a\u62df\u6865\u63a5\u6765\u5b9e\u73b0\u9694\u79bb\u3002<\/p>\n<ul>\n<li>\u4e3a\u79df\u6237\u5b50\u7f51\u521b\u5efa\u81ea\u5b9a\u4e49\u94fe\uff1aiptables -N TENANT_A_FORWARD; iptables -A FORWARD -s 10.10.1.0\/24 -j TENANT_A_FORWARD<\/li>\n<li>\u5728\u79df\u6237\u94fe\u4e2d\u62d2\u7edd\u5230\u5176\u4ed6\u79df\u6237\u7f51\u6bb5\u7684\u8bbf\u95ee\uff1aiptables -A TENANT_A_FORWARD -d 10.10.2.0\/24 -j REJECT<\/li>\n<li>\u5141\u8bb8\u79df\u6237\u8bbf\u95ee\u4e92\u8054\u7f51\u5e76\u8fdb\u884c NAT\uff08\u5047\u8bbe\u4f7f\u7528 eth0\uff09: iptables -t nat -A POSTROUTING -s 10.10.1.0\/24 -o eth0 -j MASQUERADE<\/li>\n<li>\u82e5\u9700\u66f4\u590d\u6742\u89c4\u5219\uff0c\u53ef\u7ed3\u5408 ipset \u7ef4\u62a4\u9ed1\/\u767d\u540d\u5355\u5e76\u5728\u94fe\u4e2d\u4f7f\u7528 -m set &#8211;match-set<\/li>\n<\/ul>\n<p>\u8bf4\u660e\uff1a\u5bf9\u4e8e\u9ad8\u5bc6\u5ea6\u79df\u6237\u573a\u666f\uff0c\u5efa\u8bae\u7ed3\u5408 Linux \u7f51\u7edc\u547d\u540d\u7a7a\u95f4\uff08netns\uff09\u6216\u4f7f\u7528\u4e13\u95e8\u7684\u865a\u62df\u5316\u7f51\u7edc\u63d2\u4ef6\uff0c\u4ee5\u51cf\u5c11\u89c4\u5219\u590d\u6742\u5ea6\u5e76\u63d0\u9ad8\u9694\u79bb\u5f3a\u5ea6\u3002<\/p>\n<h3>\u573a\u666f\u4e09\uff1a\u9632\u5fa1\u66b4\u529b\u7834\u89e3\u4e0eDDoS\u57fa\u7840\u9650\u901f<\/h3>\n<p>\u76ee\u6807\uff1a\u901a\u8fc7 conntrack \u4e0e\u9650\u901f\u6a21\u5757\u9650\u5236\u540c\u4e00\u6e90\u7684\u8fde\u63a5\u901f\u7387\uff0c\u51cf\u5c11\u66b4\u529b\u7834\u89e3\u548c\u7b80\u5355\u5c42\u9762 DDoS\u3002<\/p>\n<ul>\n<li>\u9650\u5236\u65b0\u8fde\u63a5\u901f\u7387\uff08\u5982\u6bcf\u5206\u949f\u4e0d\u8d85\u8fc7 60\uff09\uff1aiptables -A INPUT -p tcp &#8211;dport 22 -m connlimit &#8211;connlimit-above 10 -j REJECT<\/li>\n<li>\u4f7f\u7528 recent \u6a21\u5757\u9650\u5236\u77ed\u65f6\u95f4\u91cd\u590d\u8fde\u63a5\uff1aiptables -A INPUT -p tcp &#8211;dport 22 -m recent &#8211;name SSH &#8211;set; iptables -A INPUT -p tcp &#8211;dport 22 -m recent &#8211;name SSH &#8211;rcheck &#8211;seconds 60 &#8211;hitcount 4 -j REJECT<\/li>\n<li>\u5bf9 UDP \u653e\u5927\u653b\u51fb\uff0c\u53ef\u9650\u5236 UDP \u5305\u901f\u7387\u6216\u76f4\u63a5\u4e22\u5f03\u53ef\u7591\u6765\u6e90\uff1aiptables -A INPUT -p udp -m limit &#8211;limit 20\/s -j ACCEPT; iptables -A INPUT -p udp -j DROP<\/li>\n<\/ul>\n<p>\u8bf4\u660e\uff1aiptables \u53ef\u4f5c\u4e3a\u7b2c\u4e00\u9053\u9632\u7ebf\uff0c\u4f46\u5bf9\u4e8e\u5927\u89c4\u6a21 DDoS\uff0c\u4ecd\u9700\u7ed3\u5408\u4e0a\u6e38\u9632\u62a4\uff08\u4f8b\u5982 CDN \u6216\u4e91\u9632\u62a4\u670d\u52a1\uff09\u3002\u5728\u8de8\u5883\u8bbf\u95ee\u573a\u666f\u4e2d\uff0c\u9999\u6e2fVPS \u4e0e\u7f8e\u56fdVPS\/\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u5e26\u5bbd\u4e0e\u56de\u7a0b\u5dee\u5f02\u4f1a\u5f71\u54cd\u7f13\u89e3\u7b56\u7565\u9009\u62e9\u3002<\/p>\n<h2>\u4f18\u52bf\u5bf9\u6bd4\uff1aiptables \u4e0e\u5176\u4ed6\u65b9\u6848<\/h2>\n<p><strong>iptables \u7684\u4f18\u70b9<\/strong>\uff1a<\/p>\n<ul>\n<li>\u539f\u751f\u4e8e Linux\uff0c\u6027\u80fd\u5f00\u9500\u8f83\u5c0f\uff0c\u9002\u5408\u5ef6\u8fdf\u654f\u611f\u7684\u4e1a\u52a1\u3002<\/li>\n<li>\u89c4\u5219\u7075\u6d3b\uff0c\u53ef\u4e0e conntrack\u3001ipset\u3001netfilter \u6a21\u5757\u6df1\u5ea6\u7ed3\u5408\uff0c\u652f\u6301\u7ec6\u7c92\u5ea6\u63a7\u5236\u3002<\/li>\n<li>\u5728\u9999\u6e2f\u670d\u52a1\u5668\u6216\u9999\u6e2fVPS \u4e0a\u90e8\u7f72\u7b80\u5355\uff0c\u65e0\u9700\u989d\u5916\u4ee3\u7406\u6216\u8f6f\u4ef6\u5c42\u3002<\/li>\n<\/ul>\n<p><strong>\u9650\u5236\u4e0e\u9002\u7528\u573a\u666f<\/strong>\uff1a<\/p>\n<ul>\n<li>\u7ba1\u7406\u590d\u6742\u6027\uff1a\u89c4\u5219\u91cf\u5927\u65f6\u7ef4\u62a4\u56f0\u96be\uff0c\u5efa\u8bae\u5206\u5c42\u7ba1\u7406\u6216\u4f7f\u7528\u81ea\u52a8\u5316\u811a\u672c\uff08\u5982 iptables-restore\uff09\u3002<\/li>\n<li>\u7f3a\u5c11\u5e94\u7528\u5c42\u667a\u80fd\uff1a\u5bf9\u4e8e HTTP \u5c42\u7684\u590d\u6742\u8bbf\u95ee\u63a7\u5236\uff0cNGINX\u3001WAF \u6216\u4e91\u7aef\u9632\u62a4\u53ef\u80fd\u66f4\u5408\u9002\u3002<\/li>\n<li>\u8de8\u673a\u623f\/\u8de8\u5730\u57df\u8054\u9632\uff1a\u82e5\u5b58\u5728\u591a\u4e2a\u8282\u70b9\uff08\u5982\u9999\u6e2f\u5230\u7f8e\u56fdVPS\/\u7f8e\u56fd\u670d\u52a1\u5668\uff09\uff0c\u9700\u8981\u96c6\u4e2d\u5f0f\u7b56\u7565\u6216 SDN \u624d\u80fd\u7edf\u4e00\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<p>\u7efc\u5408\u6765\u770b\uff0ciptables \u975e\u5e38\u9002\u5408\u5355\u673a\u6216\u8fb9\u7f18\u8282\u70b9\u7684\u57fa\u672c\u8bbf\u95ee\u63a7\u5236\u4e0e\u9694\u79bb\uff0c\u800c\u5f53\u9700\u8981\u8de8\u5730\u57df\u7edf\u4e00\u7b56\u7565\u65f6\uff0c\u53ef\u4e0e\u4e91\u5382\u5546\u7684\u7f51\u7edc\u5b89\u5168\u7ec4\u3001SDN \u6216\u7b2c\u4e09\u65b9\u9632\u62a4\u670d\u52a1\u5171\u540c\u4f7f\u7528\u3002<\/p>\n<h2>\u9009\u8d2d\u4e0e\u90e8\u7f72\u5efa\u8bae<\/h2>\n<p>\u5728\u9009\u62e9\u6258\u7ba1\u73af\u5883\u65f6\uff0c\u5e94\u7ed3\u5408\u4e1a\u52a1\u5bf9\u5ef6\u8fdf\u3001\u5e26\u5bbd\u4e0e\u5408\u89c4\u6027\u7684\u8981\u6c42\u505a\u51fa\u6743\u8861\u3002\u4e0b\u9762\u7ed9\u51fa\u9488\u5bf9\u4e0d\u540c\u7528\u6237\u7684\u5efa\u8bae\uff1a<\/p>\n<ul>\n<li>\u7ad9\u957f\u4e0e\u4e2d\u5c0f\u7ad9\u70b9\uff1a\u82e5\u7528\u6237\u4e3b\u8981\u9762\u5411\u4e9a\u592a\u7528\u6237\uff0c\u9009\u62e9\u9999\u6e2fVPS \u53ef\u83b7\u5f97\u66f4\u4f18\u7684\u5730\u57df\u5ef6\u8fdf\u4e0e\u7a33\u5b9a\u6027\u3002\u5728\u90e8\u7f72 iptables \u65f6\u4f18\u5148\u8003\u8651\u7b80\u5355\u53ef\u4fe1 IP \u767d\u540d\u5355\u4e0e\u6700\u5c0f\u66b4\u9732\u7aef\u53e3\u7b56\u7565\u3002<\/li>\n<li>\u4f01\u4e1a\u7528\u6237\u4e0e\u591a\u79df\u6237\u5e73\u53f0\uff1a\u5efa\u8bae\u4f7f\u7528\u5177\u5907\u79c1\u6709\u7f51\u7edc\uff08VPC\uff09\u548c\u591a\u7f51\u5361\u652f\u6301\u7684\u9999\u6e2f\u670d\u52a1\u5668\uff0c\u7ed3\u5408 netns \u6216\u5bb9\u5668\u7f51\u7edc\u5b9e\u73b0\u79df\u6237\u9694\u79bb\uff0c\u5e76\u5728\u8fb9\u7f18\u8282\u70b9\u4f7f\u7528 iptables \u4f5c\u7b2c\u4e00\u5c42\u8fc7\u6ee4\u3002<\/li>\n<li>\u5168\u7403\u5206\u5e03\u6216\u9700\u7f8e\u56fd\u8bbf\u95ee\u7684\u670d\u52a1\uff1a\u53ef\u91c7\u7528\u6df7\u5408\u90e8\u7f72\uff0c\u4f8b\u5982\u6838\u5fc3\u670d\u52a1\u653e\u5728\u9999\u6e2f\u670d\u52a1\u5668\u4ee5\u670d\u52a1\u4e9a\u592a\u7528\u6237\uff0c\u540c\u65f6\u5728\u7f8e\u56fdVPS \u6216\u7f8e\u56fd\u670d\u52a1\u5668 \u90e8\u7f72\u955c\u50cf\u4ee5\u964d\u4f4e\u7f8e\u6d32\u8bbf\u95ee\u5ef6\u8fdf\u3002\u8de8\u6570\u636e\u4e2d\u5fc3\u7684\u5b89\u5168\u7b56\u7565\u5e94\u7ed3\u5408 iptables \u4e0e\u96c6\u4e2d\u5316\u9632\u706b\u5899\u7b56\u7565\u3002<\/li>\n<li>\u9ad8\u5e76\u53d1\u4e0e\u9632\u62a4\u9700\u6c42\uff1a\u914d\u5408 ipset\u3001conntrack \u8c03\u4f18\u548c\u4e0a\u6e38\u9632\u62a4\uff08CDN\u3001\u4e91\u9632\u706b\u5899\uff09\u53ef\u4ee5\u63d0\u5347\u6297\u653b\u51fb\u80fd\u529b\u3002\u6ce8\u610f\u6838\u67e5 VPS \u7684 conntrack \u8868\u5927\u5c0f\u3001\u6700\u5927\u8fde\u63a5\u6570\u4ee5\u53ca\u7cfb\u7edf\u7684 netfilter \u9650\u5236\u3002<\/li>\n<\/ul>\n<h2>\u8fd0\u7ef4\u5efa\u8bae\u4e0e\u5e38\u89c1\u9677\u9631<\/h2>\n<p>\u5728\u751f\u4ea7\u73af\u5883\u4e2d\u4f7f\u7528 iptables \u65f6\u5e94\u6ce8\u610f\u4ee5\u4e0b\u8981\u70b9\uff1a<\/p>\n<ul>\n<li>\u914d\u7f6e\u4e4b\u524d\u52a1\u5fc5\u5907\u4efd\u5f53\u524d\u89c4\u5219\uff1aiptables-save &gt; \/root\/iptables.bak<\/li>\n<li>\u6d4b\u8bd5\u671f\u4f7f\u7528\u4e34\u65f6\u89c4\u5219\u6216\u901a\u8fc7\u63a7\u5236\u53f0\u4fdd\u7559\u56de\u6eda\u901a\u9053\uff0c\u9632\u6b62\u9501\u6b7b SSH\u3002<\/li>\n<li>\u76d1\u63a7 conntrack \u4f7f\u7528\u7387\u4e0e\u65e5\u5fd7\uff0c\u4ee5\u4fbf\u53ca\u65f6\u6269\u5bb9 conntrack hash \u8868\uff08\u8c03\u6574 \/proc\/sys\/net\/netfilter\/nf_conntrack_max\uff09\u3002<\/li>\n<li>\u5728\u5927\u91cf\u89c4\u5219\u573a\u666f\u4e0b\uff0c\u4f7f\u7528 ipset \u80fd\u663e\u8457\u964d\u4f4e\u89c4\u5219\u6570\u91cf\u4e0e\u5339\u914d\u5f00\u9500\u3002<\/li>\n<li>\u914d\u5408\u65e5\u5fd7\u4e0e\u81ea\u52a8\u5316\u54cd\u5e94\u811a\u672c\uff08\u5982 fail2ban\uff09\u80fd\u81ea\u52a8\u5c01\u7981\u66b4\u529b\u6765\u6e90\uff0c\u51cf\u8f7b\u4eba\u5de5\u8fd0\u7ef4\u538b\u529b\u3002<\/li>\n<\/ul>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7\u672c\u6587\u7684\u8bb2\u89e3\uff0c\u53ef\u4ee5\u770b\u5230\u5728\u9999\u6e2fVPS \u4e0a\u4f7f\u7528 iptables 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