\u6807\u9898: \u7528iptables\u8bbe\u7f6e\u6709\u72b6\u6001\u9632\u706b\u5899<\/p>\n
\u5982\u679c\u4f60\u662f\u65b0\u624b\uff0c\u8bf7\u5148\u770b\u6211\u5199\u7684\u300a\u7528iptables\u8bbe\u7f6e\u9759\u592a\u9632\u706b\u5899\u300b \uff0c\u672c\u6587\u5728\u6b64\u57fa\u7840\u4e0a\u5199\u7684\uff0c\u5f88\u591a\u7ec6\u8282\u4e0a\u7684\u95ee\u9898\u7528\u5b83\u4f5c\u53c2\u8003\u3002<\/p>\n
########################<\/p>\n
\u7248\u6743\u6240\u6709\uff0c\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u81eawww.linuxsir.org \u5e76\u5199\u660e\u4f5c\u8005<\/p>\n
########################<\/p>\n
\u5728\u8fd9\u91cc\u6211\u5fc5\u987b\u8981\u89e3\u91ca\u4e00\u4e0b\u9632\u706b\u5899\u7684\u72b6\u6001(state)<\/p>\n
\u6bd4\u5982\uff0c\u4f60\u7528ssh\u8fdc\u7a0b\u8bbf\u95ee\uff0c\u4f60\u7684\u4e3b\u673a\u548c\u8fdc\u7a0b\u4e3b\u673a\u4f1a\u8fdb\u884c\u901a\u4fe1\u3002
\n\u9759\u6001\u7684\u9632\u706b\u5899\u4f1a\u8fd9\u6837\u5904\u7406\uff1a
\n\u68c0\u67e5\u65f6\u5165\u673a\u5668\u7684\u6570\u636e\u5305\uff0c\u53d1\u73b0\u6570\u636e\u662f\u6765\u6e90\u662f22\u7aef\u53e3\uff0c\u5f53\u5141\u8bb8\u65f6\u5165,\u8fde\u63a5\u4e4b\u540e\u76f8\u4e92\u901a\u4fe1\u7684\u6570\u636e\u4e5f\u4e00\u6837\uff0c\u68c0\u67e5\u6bcf\u4e2a\u6570\u636e\uff0c\u53d1\u73b0\u6570\u636e\u6765\u6e90\u4e8e22\u7aef\u53e3\uff0c\u5141\u8bb8\u901a\u8fc7!<\/p>\n
\u5982\u679c\u7528\u6709\u72b6\u6001\u7684\u9632\u706b\u5899\u5982\u4f55\u5904\u7406\u5462\uff1f
\n\u5f53\u4f60\u8fde\u63a5\u8fdc\u7a0b\u4e3b\u673a\u6210\u529f\u4e4b\u540e\uff0c\u4f60\u7684\u4e3b\u673a\u4f1a\u628a\u8fd9\u4e2a\u8fde\u63a5\u8bb0\u5f55\u4e0b\u6765\uff0c\u5f53\u6709\u6570\u636e\u4ece\u8fdc\u7a0bssh\u670d\u52a1\u5668\u518d\u8fdb\u5165\u4f60\u7684\u673a\u5668\u65f6
\n\u68c0\u67e5\u81ea\u5df1\u8fde\u63a5\u72b6\u6001\u8868\uff0c\u53d1\u73b0\u8fd9\u4e2a\u6570\u636e\u6765\u6e90\u4e8e\u4e00\u4e2a\u5df2\u7ecf\u5efa\u7acb\u7684\u8fde\u63a5\uff0c\u5141\u8bb8\u8fd9\u4e2a\u6570\u636e\u5305\u8fdb\u5165\u3002<\/p>\n
\u4ee5\u4e0a\u4e24\u79cd\u5904\u7406\uff0c\u6211\u4eec\u660e\u663e\u7684\u53d1\u73b0static firewall\u6bd4\u8f83\u751f\u786c\uff0c\u800c\u6709\u72b6\u6001\u7684\u9632\u706b\u5899\u5219\u663e\u5f97\u8981\u667a\u80fd\u4e00\u4e9b\uff01<\/p>\n
\u73b0\u5728\u6211\u4eec\u6765\u89e3\u91ca\u4e00\u4e0b\u72b6\u6001
\nNEW:\u5982\u679c\u4f60\u7684\u4e3b\u673a\u5411\u8fdc\u7a0b\u673a\u5668\u53d1\u65f6\u4e00\u4e2a\u8fde\u63a5\u8bf7\u6c42\uff0c\u8fd9\u4e2a\u6570\u636e\u5305\u72b6\u6001\u662fNEW.
\nESTABLISHED:\u5f53\u8054\u63a5\u5efa\u7acb\u4e4b\u540e\uff0c\u8fdc\u7a0b\u4e3b\u673a\u548c\u4f60\u4e3b\u673a\u901a\u4fe1\u6570\u636e\u72b6\u6001\u4e3aESTABLISHED
\nRELATED: \u50cfftp\u8fd9\u6837\u7684\u670d\u52a1\uff0c\u752821\u7aef\u53e3\u4f20\u9001\u547d\u4ee4\uff0c\u800c\u752820\u7aef\u53e3(port\u6a21\u5f0f)\u6216\u5176\u4ed6\u7aef\u53e3(PASV\u6a21\u5f0f)\u4f20\u9001\u6570\u636e\u3002\u5728\u5df2\u670921\u7aef\u53e3\u4e0a\u5efa\u7acb\u597d\u8fde\u63a5\u540e\u53d1\u9001\u547d\u4ee4\uff0c\u752820\u4f20\u9001\u7684\u6570\u636e\uff0c\u72b6\u6001\u662fRELATED<\/p>\n
\u6709\u4e86\u4ee5\u4e0a\u77e5\u8bc6\u540e\uff0c\u63a5\u4e0b\u6765\u65f6\u884c\u6211\u4eec\u7684step by step \u5427
\n\u9996\u5148\uff0c\u6211\u4eec\u8fd8\u662f\u6765\u8bbe\u7f6e\u9ed8\u8ba4\u89c4\u5219
\niptables -P INPUT DROP
\n\u8fd9\u6837\u4f60\u7684\u673a\u5668\u5c06\u5bf9\u6240\u6709\u8fdb\u5165\u4f60\u4e3b\u673a\u7684\u6570\u636e\u90fd\u4e22\u5f03<\/p>\n
\u5982\u679c\u4f60\u6709\u4e00\u53f0\u4e3b\u673a\u53ea\u662f\u7528\u4e8e\u4e2a\u4eba\u684c\u9762\u5e94\u7528\uff0c\u90a3\u4e48\u4f60\u7684\u4e3b\u673a\u4e0d\u63d0\u4f9b\u4efb\u4f55\u670d\u52a1\uff0c\u90a3\u4e48\uff0c\u6211\u4eec\u5c31\u7981\u6b62\u5176\u4ed6\u7684\u673a\u5668\u5411\u4f60\u7684\u673a\u5668\u53d1\u9001\u4efb\u4f55\u8fde\u63a5\u8bf7\u6c42
\niptables -A INPUT -m state --state NEW -j DROP<\/p>\n
\u8fd9\u4e2a\u89c4\u5219\u5c06\u6240\u6709\u53d1\u9001\u5230\u4f60\u7684\u673a\u5668\u6570\u636e\u5305\uff0c\u72b6\u6001\u662fNEW\u7684\u5305\u4e22\u5f03\u3002\u8fd9\u6837\uff0c\u4e5f\u5c31\u662f\u4e0d\u5141\u8bb8\u5176\u4ed6\u7684\u673a\u5668\u4e3b\u52a8\u53d1\u8d77\u5bf9\u4f60\u673a\u5668\u7684\u8fde\u63a5\uff0c\u4f46\u662f\u4f60\u5374\u53ef\u4ee5\u4e3b\u52a8\u7684\u8fde\u63a5\u5176\u4ed6\u7684\u673a\u5668\uff0c\u4e0d\u8fc7\u4ec5\u4ec5\u53ea\u662f\u8fde\u63a5\u800c\u5df2\uff0c\u8fde\u63a5\u4e4b\u540e\u7684\u6570\u636e\u5c31\u662fESTABLISHED\u72b6\u6001\u7684\u4e86\uff0c\u6211\u4eec\u518d\u52a0\u4e0a\u4e00\u6761\u3002<\/p>\n
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
\n\u6240\u6709\u5df2\u7ecf\u5efa\u7acb\u8054\u63a5\uff0c\u6216\u8005\u4e0e\u4e4b\u76f8\u5173\u7684\u6570\u636e\u5141\u8bb8\u901a\u8fc7<\/p>\n
\u597d\u4e86,\u4eec\u4eec\u6765\u603b\u7ed3\u4e00\u4e0b\u4e09\u6761\u8bed\u53e5,\u56e0\u4e3a\u5b83\u662f\u4e00\u4e2a\u5f88\u597d\u7684\u4e2a\u4eba\u684c\u9762\u4e3b\u673a\u7684\u9632\u706b\u5899\u3002
\niptables -P INPUT DROP
\n#iptables -A INPUT -m state --state NEW -j DROP
\niptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
\n\u6211\u4eec\u770b\u5230\uff0c\u7b2c\u4e8c\u6761\u88ab\u6ce8\u91ca\u6389\u4e86\uff0c\u56e0\u4e3a\u90a3\u4e00\u89c4\u5219\u5b8c\u5168\u53ef\u4ee5\u7701\u53bb\uff0c\u8ba9\u9ed8\u8ba4\u89c4\u5219\u5904\u7406\u5c31\u884c\u4e86\u3002
\n\u662f\u4e0d\u662f\u663e\u5f97\u5f88\u7b80\u5355\u5462\uff0c\u5bf9\u4e8e\u4e2a\u4eba\u684c\u9762\u5e94\u7528\u6765\u8bf4\uff0c\u53ea\u7528\u521a\u624d\u90a3\u4e24\u6761\u8bed\u53e5\uff0c\u5c31\u80fd\u8ba9\u4f60\u63a5\u5165internet\u7f51\u7684\u4e3b\u673a\u8db3\u591f\u5b89\u5168\u3002\u800c\u4e14\u4f60\u968f\u610f\u8bbf\u95eeinternet\uff0c\u4f46\u662f\u5916\u90e8\u5374\u4e0d\u80fd\u4e3b\u52a8\u53d1\u8d77\u5bf9\u4f60\u673a\u5668\u7684\u8fde\u63a5\uff0c\u771f\u662f\u723d\u554a\uff01
\n\u5f53\u7136\uff0c\u5982\u662f\u4f60\u7684IE\u6709\u6f0f\u6d1e\u7684\u8bdd\uff0ciptables\u8fd8\u662f\u65e0\u6d4e\u4e8e\u4e8b\u7684\uff0c\u8fd9\u4e5f\u4e0d\u662fiptables\u7684\u5de5\u4f5c\u8303\u56f4\u3002
\n\u6211\u4eec\u53ef\u770b\u5230\u6709\u72b6\u6001\u7684\u9632\u706b\u5899\u6bd4\u9759\u6001\u9632\u706b\u5899\u8981\"\u667a\u80fd\"\u4e00\u4e9b,\u5f53\u7136\u89c4\u5219\u5bb9\u6613\u8bbe\u7f6e\u4e00\u4e9b\u3002<\/p>\n
\u5982\u679c\u4f60\u7684\u4e3b\u673a\u662f\u670d\u52a1\u5668\uff0c\u63a5\u4e0b\u6765\u7684\u95ee\u9898\u5c31\u7b80\u5355\u4e86\u3002\u8fd9\u91cc\u5047\u5982\u6211\u4eec\u5f00\u4e86www \u548cftp\u670d\u52a1\u3002\u6ce8\u610fftp\u7684pasv\u6a21\u5f0f\uff0c\u4f1a\u4f7f\u7528\u52a8\u6001\u7684\u7aef\u53e3\u6765\u4f20\u9001\u6570\u636e\uff0c\u800c\u5e76\u975e20\u7aef\u53e3\u3002\u8fd9\u4e9b\u5bf9\u6709\u72b6\u6001\u7684\u9632\u706b\u5899\u6765\u8bf4\uff0c\u8f7b\u6613\u505a\u5230\uff0c\u751a\u81f3\u4e0d\u7528\u77e5\u9053pasv\u6a21\u5f0f\u7684ftp\u7528\u54ea\u4e9b\u7aef\u53e3,\u56e0\u4e3a\u4f60\u7684\u4e3b\u673a\u4f1a\u8ba4\u8bc6\u5230ftp\u7ed9\u522b\u4eba\u4e3b\u673a\u4f20\u9001\u6587\u4ef6\u65f6\uff0c\u8ba4\u8bc6\u5230\u8fd9\u4e9b\u6570\u636e\u662fRELATED<\/p>\n
\u5728\u540e\u9762\u52a0\u4e0b
\niptables -A INPUT -i ppp0 -p tcp -dport 21 -j ACCEPT
\niptables -A INPUT -i ppp0 -p udp -dport 21 -j ACCEPT
\niptables -A INPUT -i ppp0 -p tcp -dport 80 -j ACCEPT
\niptables -A INPUT -i ppp0 -p udp -dport 80 -j ACCEPT
\n\u597d\u4e86\uff0c\u81f3\u6b64\u6211\u4eec\u7684\u5de5\u4f5c\u5c31\u5168\u90e8\u5b8c\u6210\u4e86\uff0c\u4eff\u7167\u6211\u4e0a\u4e00\u6587\u7684\u65b9\u6cd5\uff0c\u6700\u540e\u7ed9\u51fa\u4e00\u4e2a\u811a\u672c\uff0c\u6709\u8be6\u7ec6\u7684\u6ce8\u91ca<\/p>\n
!\/bin\/bash
\n#define const here
\nAccept_Ports=\"80 20 21\" #\u5141\u8bb8internet\u8bbf\u95ee\u7684\u81ea\u5df1\u670d\u52a1\u7aef\u53e3<\/p>\n
# init
\niptables -F
\niptables -X
\niptables -t nat -F
\niptables -t nat -X<\/p>\n
# set default ruler here
\niptables -P INPUT DROP<\/p>\n
# Allow inner Network access
\niptables -A INPUT -i !ppp0 -j ACCEPT<\/p>\n
# set stated ruler here,this is the most important ruler
\niptables -A INPUT -i ppp0 -m state --state ESTABLISHED,RELATED -j ACCEPT<\/p>\n
# set ruler so that other can access service on your server
\nfor Port in \"$Accept_Ports\" ; do
\niptables -A INPUT -i ppp0 -p udp --dport ${Port} -j ACCEPT
\niptables -A INPUT -i ppp0 -p tpc --dport ${Port} -j ACCEPT
\ndone<\/p>\n
# the ruler can make you firewall betterd
\niptables -A INPUT -i ppp0 -p tcp -j REJECT --reject-with tcp-reset
\niptables -A INPUT -i ppp0 -p udp -j REJECT --reject-with icmp-port-unreachable<\/p>\n
\u6ce8\uff1a
\n\u6709\u72b6\u6001\u9632\u706b\u5899\u9700\u8981\u5185\u6838\u7684\u652f\u6301\uff0c\u5e78\u597d\uff0c\u591a\u6570\u7684\u53d1\u884c\u7248\u90fd\u652f\u6301\u8fd9\u4e00\u7279\u5f81<\/p>\n","protected":false},"excerpt":{"rendered":"
\u6807\u9898: \u7528iptables\u8bbe\u7f6e\u6709\u72b6\u6001\u9632\u706b\u5899 \u5982\u679c\u4f60\u662f\u65b0\u624b\uff0c\u8bf7\u5148\u770b\u6211\u5199\u7684\u300a\u7528iptables\u8bbe\u7f6e\u9759\u592a\u9632\u706b\u5899\u300b \uff0c\u672c\u6587\u5728\u6b64\u57fa\u7840\u4e0a\u5199\u7684\uff0c\u5f88\u591a\u7ec6\u8282\u4e0a\u7684\u95ee\u9898\u7528\u5b83\u4f5c\u53c2\u8003\u3002 ####################...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-120","post","type-post","status-publish","format-standard","hentry","category-iptables"],"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/120","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=120"}],"version-history":[{"count":0,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/120\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=120"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=120"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=120"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}