\u6807\u9898: iptables\u5165\u95e8\u6559\u7a0b--\u8bbe\u7f6e\u9759\u6001\u9632\u706b\u5899\uff08 step by step\uff09<\/p>\n
iptables\uff0d\uff0d\u9759\u6001\u9632\u706b\u5899\u5b9e\u4f8b\u6559\u7a0b follow me<\/p>\n
\u4ecb\u7ecd\uff1a
\n\u8fd9\u7bc7\u6587\u7ae0\u662f\u672c\u4eba\u539f\u521b\uff0c\u5411\u8bfb\u8005\u5c55\u793a\u4e86\u5982\u4f55\u4e00\u6b65\u4e00\u6b65\u5efa\u7acb\u9759\u6001\u9632\u706b\u5899\u6765\u4fdd\u62a4\u60a8\u7684\u8ba1\u7b97\u673a\uff0c\u540c\u65f6\u5728\u6bcf\u4e00\u6b65\u4e2d\uff0c\u6211\u529b\u56fe\u5411\u8bfb\u8005\u8bb2\u8ff0\u6e05\u695a\u539f\u7406\u3002\u5728\u8fd9\u7bc7\u6559\u7a0b\u4e4b\u540e\uff0c\u4f60\u5c06\u80fd\u7406\u89e3\u5230\u9632\u706b\u5899\u5185\u5728\u8fc7\u6ee4\u673a\u5236\uff0c\u540c\u65f6\u4e5f\u80fd\u81ea\u5df1\u52a8\u624b\u521b\u5efa\u7b26\u5408\u81ea\u5df1\u8981\u6c42\u7684\u9632\u706b\u5899\u3002<\/p>\n
\u7248\u6743\u6240\u6709\uff0c\u8f6c\u8f7d\u8bf7\u6ce8\u660e\u6765\u81eawww.linuxsir.org \u5e76\u5199\u660e\u4f5c\u8005<\/p>\n
1\u3001iptables\u4ecb\u7ecd<\/p>\n
iptables\u662f\u590d\u6742\u7684\uff0c\u5b83\u96c6\u6210\u5230linux\u5185\u6838\u4e2d\u3002\u7528\u6237\u901a\u8fc7iptables\uff0c\u53ef\u4ee5\u5bf9\u8fdb\u51fa\u4f60\u7684\u8ba1\u7b97\u673a\u7684\u6570\u636e\u5305\u8fdb\u884c\u8fc7\u6ee4\u3002\u901a\u8fc7iptables\u547d\u4ee4\u8bbe\u7f6e\u4f60\u7684\u89c4\u5219\uff0c\u6765\u628a\u5b88\u4f60\u7684\u8ba1\u7b97\u673a\u7f51\u7edc\u2500\u2500\u54ea\u4e9b\u6570\u636e\u5141\u8bb8\u901a\u8fc7\uff0c\u54ea\u4e9b\u4e0d\u80fd\u901a\u8fc7\uff0c\u54ea\u4e9b\u901a\u8fc7\u7684\u6570\u636e\u8fdb\u884c\u8bb0\u5f55\uff08log\uff09\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u5c06\u544a\u8bc9\u4f60\u5982\u4f55\u8bbe\u7f6e\u81ea\u5df1\u7684\u89c4\u5219\uff0c\u4ece\u73b0\u5728\u5c31\u5f00\u59cb\u5427\u3002<\/p>\n
2\u3001\u521d\u59cb\u5316\u5de5\u4f5c<\/p>\n
\u5728shell\u63d0\u793a\u7b26 # \u4e0b\u6253\u5165<\/p>\n
iptables -F<\/p>\n
iptables -X<\/p>\n
iptables -t nat -F<\/p>\n
iptables -t nat -X<\/p>\n
\u4ee5\u4e0a\u6bcf\u4e00\u4e2a\u547d\u4ee4\u90fd\u6709\u5b83\u786e\u5207\u7684\u542b\u4e49\u3002\u4e00\u822c\u8bbe\u7f6e\u4f60\u7684iptables\u4e4b\u524d\uff0c\u9996\u5148\u8981\u6e05\u9664\u6240\u6709\u4ee5\u524d\u8bbe\u7f6e\u7684\u89c4\u5219\uff0c\u6211\u4eec\u5c31\u628a\u5b83\u53eb\u505a\u521d\u59cb\u5316\u597d\u4e86\u3002\u867d\u7136\u5f88\u591a\u60c5\u51b5\u4e0b\u5b83\u4ec0\u4e48\u4e5f\u4e0d\u505a\uff0c\u4f46\u662f\u4fdd\u9669\u8d77\u89c1\uff0c\u4e0d\u59a8\u5c0f\u5fc3\u4e00\u70b9\u5427\uff01 \u5982\u679c\u4f60\u7528\u7684\u662fredhat \u6216fedora\uff0c\u90a3\u4e48\u4f60\u6709\u66f4\u7b80\u5355\u7684\u529e\u6cd5<\/p>\n
service iptables stop<\/p>\n
3\u3001\u5f00\u59cb\u8bbe\u7f6e\u89c4\u5219:<\/p>\n
\u63a5\u4e0b\u4e0b\u5f00\u59cb\u8bbe\u7f6e\u4f60\u7684\u89c4\u5219\u4e86<\/p>\n
iptables -P INPUT DROP<\/p>\n
\u8fd9\u4e00\u6761\u547d\u4ee4\u5c06\u4f1a\u4e3a\u4f60\u6784\u5efa\u4e00\u4e2a\u975e\u5e38\u201c\u5b89\u5168\u201d\u7684\u9632\u706b\u5899\uff0c\u6211\u5f88\u96be\u60f3\u8c61\u6709\u54ea\u4e2ahacker\u80fd\u653b\u7834\u8fd9\u6837\u7684\u673a\u5668\uff0c\u56e0\u4e3a\u5b83\u5c06\u6240\u6709\u4ece\u7f51\u7edc\u8fdb\u5165\u4f60\u673a\u5668\u7684\u6570\u636e\u4e22\u5f03(drop)\u4e86\u3002\u8fd9\u5f53\u7136\u662f\u5b89\u5168\u8fc7\u5934\u4e86\uff0c\u6b64\u65f6\u4f60\u7684\u673a\u5668\u5c06\u76f8\u5f53\u4e8e\u6ca1\u6709\u7f51\u7edc\u3002\u5982\u679c\u4f60ping localhost\uff0c\u4f60\u5c31\u4f1a\u53d1\u73b0\u5c4f\u5e55\u4e00\u76f4\u505c\u5728\u90a3\u91cc\uff0c\u56e0\u4e3aping\u6536\u4e0d\u5230\u4efb\u4f55\u56de\u5e94\u3002<\/p>\n
4 \u3001\u6dfb\u52a0\u89c4\u5219<\/p>\n
\u63a5\u7740\u4e0a\u6587\u7ee7\u7eed\u8f93\u5165\u547d\u4ee4\uff1a<\/p>\n
iptables -A INPUT -i ! ppp0 -j ACCEPT<\/p>\n
\u8fd9\u6761\u89c4\u5219\u7684\u610f\u601d\u662f\uff1a\u63a5\u53d7\u6240\u6709\u7684\uff0c\u6765\u6e90\u4e0d\u662f\u7f51\u7edc\u63a5\u53e3ppp0\u7684\u6570\u636e\u3002<\/p>\n
\u6211\u4eec\u5047\u8bbe\u4f60\u6709\u4e24\u4e2a\u7f51\u7edc\u63a5\u53e3\uff0ceth0\u8fde\u63a5\u5c40\u57df\u7f51\uff0cloop\u662f\u56de\u73af\u7f51\uff08localhost\uff09\u3002ppp0\u662f\u4e00\u822c\u7684adsl\u4e0a\u7f51\u7684internet\u7f51\u7edc\u63a5\u53e3\uff0c\u5982\u679c\u4f60\u4e0d\u662f\u8fd9\u79cd\u4e0a\u7f51\u65b9\u5f0f\uff0c\u90a3\u5219\u6709\u53ef\u80fd\u662feth1\u3002\u5728\u6b64\u6211\u5047\u8bbe\u4f60\u662fadsl\u4e0a\u7f51\uff0c\u4f60\u7684internet\u63a5\u53e3\u662fppp0<\/p>\n
\u6b64\u65f6\u4f60\u5373\u5141\u8bb8\u4e86\u5c40\u57df\u7f51\u7684\u8bbf\u95ee\uff0c\u4f60\u4e5f\u53ef\u4ee5\u8bbf\u95eelocalhost<\/p>\n
\u6b64\u65f6\u518d\u8f93\u5165\u547d\u4ee4 ping localhost\uff0c\u7ed3\u679c\u8fd8\u4f1a\u548c\u521a\u624d\u4e00\u6837\u5417\uff1f<\/p>\n
\u5230\u6b64\u6211\u4eec\u8fd8\u4e0d\u80fd\u8bbf\u95eewww,\u4e5f\u4e0d\u80fdmail\uff0c\u63a5\u7740\u770b\u5427\u3002<\/p>\n
5\u3001\u6211\u60f3\u8bbf\u95eewww<\/p>\n
iptables -A INPUT -i ppp0 -p tcp -sport 80 -j ACCEPT<\/p>\n
\u5141\u8bb8\u6765\u81ea\u7f51\u7edc\u63a5\u53e3ppp0(internet\u63a5\u53e3)\uff0c\u5e76\u4e14\u6765\u6e90\u7aef\u53e3\u662f80\u7684\u6570\u636e\u8fdb\u5165\u4f60\u7684\u8ba1\u7b97\u673a\u3002
\n80\u7aef\u53e3\u6b63\u662fwww\u670d\u52a1\u6240\u4f7f\u7528\u7684\u7aef\u53e3\u3002<\/p>\n
\u597d\u4e86\uff0c\u73b0\u5728\u53ef\u4ee5\u770b\u7f51\u9875\u4e86\u3002\u4f46\u662f\uff0c\u4f60\u80fd\u770b\u5230\u5417\uff1f<\/p>\n
\u5982\u679c\u4f60\u5728\u6d4f\u89c8\u5668\u7684\u5730\u5740\u4e2d\u8f93\u5165www.baidu.com\uff0c\u80fd\u770b\u5230\u7f51\u9875\u5417\uff1f<\/p>\n
\u4f60\u5f97\u5230\u7684\u7ed3\u679c\u4e00\u5b9a\u662f\uff1a\u627e\u4e0d\u5230\u4e3b\u673awww.baidu.com<\/p>\n
\u4f46\u662f\uff0c\u5982\u679c\u4f60\u518d\u8f93\u5165220.181.27.5,\u4f60\u4ecd\u7136\u80fd\u591f\u8bbf\u95eebaidu\u7684\u7f51\u9875\u3002<\/p>\n
\u4e3a\u4ec0\u4e48\uff1f\u5982\u679c\u4f60\u4e86\u89e3dns\u7684\u8bdd\u5c31\u4e00\u5b9a\u77e5\u9053\u539f\u56e0\u4e86\u3002<\/p>\n
\u56e0\u4e3a\u5982\u679c\u4f60\u6253\u5165www.baidu.com,\u4f60\u7684\u7535\u8111\u65e0\u6cd5\u53d6\u5f97www.baidu.com\u8fd9\u4e2a\u540d\u79f0\u6240\u80fd\u5e94\u7684ip\u5730\u5740220.181.27.5\u3002\u5982\u679c\u4f60\u786e\u5b9e\u8bb0\u5f97\u8fd9\u4e2aip\uff0c\u90a3\u4e48\u4f60\u4ecd\u7136\u80fd\u591f\u8bbf\u95eewww,\u4f60\u5f53\u7136\u53ef\u4ee5\u53ea\u7528ip\u6765\u8bbf\u95eewww\uff0c\u5982\u679c\u4f60\u60f3\u6311\u6218\u4f60\u7684\u8bb0\u5fc6\u7684\u8bdd^ _ ^\uff0c\u5f53\u7136\uff0c\u6211\u4eec\u8981\u6253\u5f00DNS\u3002<\/p>\n
6\u3001\u6253\u5f00dns\u7aef\u53e3<\/p>\n
\u6253\u5f00\u4f60\u7684dns\u7aef\u53e3\uff0c\u8f93\u5165\u5982\u4e0b\u547d\u4ee4\uff1a<\/p>\n
iptables -A INPUT -i ppp0 -p udp -sport 53 -j ACCEPT<\/p>\n
\u8fd9\u6761\u547d\u4ee4\u7684\u542b\u4e49\u662f\uff0c\u63a5\u53d7\u6240\u6709\u6765\u81ea\u7f51\u7edc\u63a5\u53e3ppp0,upd\u534f\u8bae\u768453\u7aef\u53e3\u7684\u6570\u636e\u300253\u4e5f\u5c31\u662f\u8457\u540d\u7684dns\u7aef\u53e3\u3002<\/p>\n
\u6b64\u65f6\u6d4b\u8bd5\u4e00\u4e0b\uff0c\u4f60\u80fd\u901a\u8fc7\u4e3b\u673a\u540d\u79f0\u8bbf\u95eewww\u5417\uff1f\u4f60\u80fd\u901a\u8fc7ip\u8bbf\u95eewww\u5417\uff1f<\/p>\n
\u5f53\u7136\uff0c\u90fd\u53ef\u4ee5\uff01<\/p>\n
7\u3001\u67e5\u770b\u9632\u706b\u5899<\/p>\n
\u6b64\u65f6\u53ef\u4ee5\u67e5\u770b\u4f60\u7684\u9632\u706b\u5899\u4e86<\/p>\n
iptables -L<\/p>\n
\u5982\u679c\u4f60\u53ea\u60f3\u8bbf\u95eewww\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u5230\u6b64\u4e3a\u6b62\uff0c\u4f60\u5c06\u53ea\u80fd\u8bbf\u95eewww\u4e86\u3002 \u4e0d\u8fc7\u5148\u522b\u6025\uff0c\u5c06\u4e0a\u9762\u8bb2\u7684\u5185\u5bb9\u603b\u7ed3\u4e00\u4e0b\uff0c\u5199\u6210\u4e00\u4e2a\u811a\u672c\u3002<\/p>\n
#!\/bin\/bash<\/p>\n
# This is a script<\/p>\n
# Edit by liwei<\/p>\n
# establish static firewall<\/p>\n
iptables -F<\/p>\n
iptables -X<\/p>\n
iptables -t nat -F<\/p>\n
iptables -t nat -X<\/p>\n
iptables -P INPUT DROP<\/p>\n
iptables -A INPUT -i ! ppp0 -j ACCEPT<\/p>\n
iptables -A INPUT -i ppp0 -p tcp --sport 80 -j ACCEPT<\/p>\n
iptables -A INPUT -i ppp0 -p udp --sport 53 -j ACCEPT<\/p>\n
8\u3001\u590d\u6742\u5417?\u5230\u6b64iptables\u53ef\u4ee5\u6309\u4f60\u7684\u8981\u6c42\u8fdb\u884c\u5305\u8fc7\u6ee4\u4e86\u3002\u4f60\u53ef\u4ee5\u518d\u8bbe\u5b9a\u4e00\u4e9b\u7aef\u53e3\uff0c\u5141\u8bb8\u4f60\u7684\u673a\u5668\u8bbf\u95ee\u8fd9\u4e9b\u7aef\u53e3\u3002\u8fd9\u6837\u6709\u53ef\u80fd\uff0c\u4f60\u4e0d\u80fd\u8bbf\u95eeQQ\uff0c\u4e5f\u53ef\u80fd\u4e0d\u80fd\u6253\u7f51\u7edc\u6e38\u620f\uff0c\u662f\u597d\u662f\u574f\uff0c\u8fd8\u662f\u8981\u770b\u4f60\u81ea\u5df1\u800c\u5b9a\u4e86\u3002\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0cQQ\u8fd9\u4e2a\u4e1c\u897f\u8fd8\u771f\u662f\u4e0d\u597d\u63a7\u5236\uff0c\u7528\u6237\u4e0e\u670d\u52a1\u5668\u8fde\u63a5\u4f7f\u7528\u7684\u597d\u50cf\u662f8888\u7aef\u53e3\uff0c\u800cQQ\u4e0a\u597d\u53cb\u4e92\u53d1\u6d88\u606f\u4f7f\u7528\u7684\u53c8\u662fudp\u76844444\u7aef\u53e3(\u5177\u4f53\u662f\u4e0d\u662f4444\u8fd8\u4e0d\u592a\u6e05\u695a)\u3002\u800c\u4e14QQ\u8fd8\u53ef\u4ee5\u4f7f\u7528www\u768480\u7aef\u53e3\u8fdb\u884c\u767b\u5f55\u5e76\u53d1\u6d88\u606f\uff0c\u770b\u6765\u5b66\u65e0\u6b62\u5883\uff0c\u4f60\u771f\u7684\u60f3\u628a\u8fd9\u4e2a\u5bb6\u4f19\u63a7\u5236\u4f4f\u8fd8\u4e0d\u5bb9\u6613\u5462\uff1f\u8fd8\u662f\u8fdb\u5165\u6211\u4eec\u7684\u6b63\u9898\u5427\u3002<\/p>\n
\u5982\u679c\u4f60\u7684\u673a\u5668\u662f\u670d\u52a1\u5668\uff0c\u600e\u4e48\u529e\uff1f<\/p>\n
9\u3001\u5982\u679c\u4e0d\u5de7\u4f60\u7684\u673a\u5668\u662f\u670d\u52a1\u5668\uff0c\u5e76\u4e14\u8981\u63d0\u4f9bwww\u670d\u52a1\u3002\u663e\u7136\uff0c\u4ee5\u4e0a\u7684\u811a\u672c\u5c31\u4e0d\u80fd\u7b26\u5408\u6211\u4eec\u7684\u8981\u6c42\u4e86\u3002\u4f46\u53ea\u8981\u4f60\u6491\u63e1\u4e86\u89c4\u5219\uff0c\u7a0d\u4f5c\u4fee\u6539\u540c\u6837\u4e5f\u80fd\u5f88\u597d\u7684\u5de5\u4f5c\u3002\u5728\u6700\u540e\u9762\u52a0\u4e0a\u4e00\u53e5<\/p>\n
iptables -A INPUT -i ppp0 -p tcp --dport 80 -j ACCEPT<\/p>\n
\u8fd9\u4e00\u53e5\u4e5f\u5c31\u662f\u5c06\u81ea\u5df1\u673a\u5668\u4e0a\u768480\u7aef\u53e3\u5bf9\u5916\u5f00\u653e\u4e86,\u8fd9\u6837internet\u4e0a\u7684\u5176\u4ed6\u4eba\u5c31\u80fd\u8bbf\u95ee\u4f60\u7684www\u4e86\u3002\u5f53\u7136\uff0c\u4f60\u7684www\u670d\u52a1\u5668\u5f97\u5de5\u4f5c\u624d\u884c\u3002\u5982\u679c\u4f60\u7684\u673a\u5668\u540c\u65f6\u662fsmtp\u548cpop3\u670d\u52a1\u5668\uff0c\u540c\u6837\u7684\u518d\u52a0\u4e0a\u4e24\u6761\u8bed\u53e5,\u5c06--dport\u540e\u9762\u768480\u6539\u621025\u548c110\u5c31\u884c\u4e86\u3002\u5982\u679c\u4f60\u8fd8\u6709\u4e00\u4e2aftp\u670d\u52a1\u5668\uff0c\u5475\u5475\uff0c\u5982\u679c\u4f60\u8981\u6253\u5f00100\u4e2a\u7aef\u53e3\u5462\u2026\u2026<\/p>\n
\u6211\u4eec\u7684\u5de5\u4f5c\u597d\u50cf\u662f\u91cd\u590d\u6027\u7684\u6253\u5165\u7c7b\u4f3c\u7684\u8bed\u53e5\uff0c\u4f60\u53ef\u80fd\u81ea\u5df1\u4e5f\u60f3\u5230\u4e86\uff0c\u6211\u53ef\u4ee5\u7528\u4e00\u4e2a\u5faa\u73af\u8bed\u53e5\u6765\u5b8c\u6210\uff0c\u5bf9\uff0c\u6b64\u5904\u53ef\u4ee5\u6709\u6548\u7684\u5229\u7528shell\u811a\u672c\u7684\u529f\u80fd\uff0c\u4e5f\u8ba9\u4f60\u4f53\u9a8c\u5230\u4e86shell\u811a\u672c\u8bed\u8a00\u7684\u5a01\u529b\u3002\u770b\u4e0b\u6587\uff1a<\/p>\n
10\u3001\u7528\u811a\u672c\u7b80\u5316\u4f60\u7684\u5de5\u4f5c,\u9605\u8bfb\u4e0b\u9762\u7684\u811a\u672c<\/p>\n
#!\/bin\/bash<\/p>\n
# This is a script<\/p>\n
# Edit by liwei<\/p>\n
# establish a static firewall<\/p>\n
# define const here<\/p>\n
Open_ports=\"80 25 110 10\" # \u81ea\u5df1\u673a\u5668\u5bf9\u5916\u5f00\u653e\u7684\u7aef\u53e3<\/p>\n
Allow_ports=\"53 80 20 21\" # internet\u7684\u6570\u636e\u53ef\u4ee5\u8fdb\u5165\u81ea\u5df1\u673a\u5668\u7684\u7aef\u53e3<\/p>\n
#init<\/p>\n
iptables -F<\/p>\n
iptables -X<\/p>\n
iptables -t nat -F<\/p>\n
iptables -t nat -X<\/p>\n
iptables -P INPUT DROP #we can use another method to instead it<\/p>\n
iptables -A INPUT -i ! ppp0 -j ACCEPT<\/p>\n
# define ruler so that some data can come in.<\/p>\n
for Port in \"$Allow_ports\" ; do<\/p>\n
iptables -A INPUT -i ppp0 -p tcp -sport $Port -j ACCEPT<\/p>\n
iptables -A INPUT -i ppp0 -p udp -sport $Port -j ACCEPT<\/p>\n
done<\/p>\n
for Port in \"$Open_ports\" ; do<\/p>\n
iptables -A INPUT -i ppp0 -p tcp -dport $Port -j ACCEPT<\/p>\n
iptables -A INPUT -i ppp0 -p udp -dport $Port -j ACCEPT<\/p>\n
done<\/p>\n
\u8fd9\u4e2a\u811a\u672c\u6709\u4e09\u4e2a\u90e8\u5206\uff08\u6700\u524d\u9762\u7684\u4e00\u6bb5\u662f\u6ce8\u91ca\uff0c\u4e0d\u7b97\u5728\u8fd9\u4e09\u90e8\u5206\u4e2d\uff09<\/p>\n
\u7b2c\u4e00\u90e8\u5206\u662f\u5b9a\u4e49\u4e00\u4e9b\u7aef\u53e3\uff1a\u8bbf\u95ee\u4f60\u7684\u673a\u5668\"Open_ports\"\u7aef\u53e3\u7684\u6570\u636e\uff0c\u5141\u8bb8\u8fdb\u5165\uff1b\u6765\u6e90\u662f\"Allow_ports\"\u7aef\u53e3\u7684\u6570\u636e\uff0c\u4e5f\u80fd\u591f\u8fdb\u5165\u3002<\/p>\n
\u7b2c\u4e8c\u90e8\u5206\u662fiptables\u7684\u521d\u59cb\u5316\uff0c\u7b2c\u4e09\u90e8\u5206\u662f\u5bf9\u5b9a\u4e49\u7684\u7aef\u53e3\u5177\u4f53\u7684\u64cd\u4f5c\u3002<\/p>\n
\u5982\u679c\u4ee5\u540e\u6211\u4eec\u7684\u8981\u6c42\u53d1\u751f\u4e86\u4e00\u4e9b\u53d8\u5316\uff0c\u6bd4\u5982,\u4f60\u7ed9\u81ea\u5df1\u7684\u673a\u5668\u52a0\u4e0a\u4e86\u4e00\u4e2aftp\u670d\u52a1\u5668\uff0c\u90a3\u4e48\u53ea\u8981\u5728\u7b2c\u4e00\u90e8\u5206\"Open_ports\"\u7684\u5b9a\u4e49\u4e2d\uff0c\u5c06ftp\u5bf9\u5e94\u768420\u4e0e21\u7aef\u53e3\u52a0\u4e0a\u53bb\u5c31\u884c\u4e86\u3002\u5475\u5475\uff0c\u5230\u6b64\u4f60\u4e5f\u4e00\u5b9a\u4f53\u4f1a\u5230\u4e86\u811a\u672c\u529f\u80fd\u7684\u5f3a\u5927\u7684\u4f38\u7f29\u6027\uff0c\u4f46\u811a\u672c\u7684\u80fd\u529b\u8fd8\u8fdc\u4e0d\u6b62\u8fd9\u4e9b\u5462\uff01<\/p>\n
11\u3001\u4f7f\u4f60\u7684\u9632\u706b\u5899\u66f4\u52a0\u5b8c\u5584<\/p>\n
\u770b\u4e0a\u9762\u7684\u811a\u672cinit\u90e8\u5206\u7684\u5012\u6570\u7b2c\u4e8c\u53e5<\/p>\n
iptables -P INPUT DROP<\/p>\n
\u8fd9\u662f\u7ed9\u9632\u706b\u5899\u8bbe\u7f6e\u9ed8\u8ba4\u89c4\u5219\u3002\u5f53\u8fdb\u5165\u6211\u4eec\u8ba1\u7b97\u673a\u7684\u6570\u636e\uff0c\u4e0d\u5339\u914d\u6211\u4eec\u7684\u4efb\u4f55\u4e00\u4e2a\u6761\u4ef6\u65f6\uff0c\u90a3\u4e48\u5c31\u7531\u9ed8\u8ba4\u89c4\u5219\u6765\u5904\u7406\u8fd9\u4e2a\u6570\u636e----drop\u6389\uff0c\u4e0d\u7ed9\u53d1\u9001\u65b9\u4efb\u4f55\u5e94\u7b54\u3002<\/p>\n
\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u4f60\u4eceinternet\u53e6\u5916\u7684\u4e00\u53f0\u8ba1\u7b97\u673a\u4e0aping\u4f60\u7684\u4e3b\u673a\u7684\u8bdd\uff0cping\u4f1a\u4e00\u76f4\u505c\u5728\u90a3\u91cc\uff0c\u6ca1\u6709\u56de\u5e94\u3002<\/p>\n
\u5982\u679c\u9ed1\u5ba2\u7528namp\u5de5\u5177\u5bf9\u4f60\u7684\u7535\u8111\u8fdb\u884c\u7aef\u53e3\u626b\u63cf\uff0c\u90a3\u4e48\u5b83\u4f1a\u63d0\u793a\u9ed1\u5ba2\uff0c\u4f60\u7684\u8ba1\u7b97\u673a\u5904\u4e8e\u9632\u706b\u5899\u7684\u4fdd\u62a4\u4e4b\u4e2d\u3002\u6211\u53ef\u4e0d\u60f3\u8ba9\u9ed1\u5ba2\u5bf9\u6211\u7684\u8ba1\u7b97\u673a\u4e86\u89e3\u592a\u591a\uff0c\u600e\u4e48\u529e\uff0c\u5982\u679c\u6211\u4eec\u628adrop\u6539\u6210\u5176\u4ed6\u7684\u52a8\u4f5c\uff0c\u6216\u8bb8\u80fd\u591f\u9a97\u8fc7\u8fd9\u4f4d\u521a\u51fa\u9053\u7684\u9ed1\u5ba2\u5462\u3002<\/p>\n
\u600e\u4e48\u6539\u5462\uff1f\u5c06\u521a\u624d\u7684\u90a3\u4e00\u53e5( iptables -P INPUT DROP )\u53bb\u6389\uff0c\u5728\u811a\u672c\u7684\u6700\u540e\u9762\u52a0\u4e0a<\/p>\n
iptables -A INPUT -i ppp0 -p tcp -j REJECT --reject-with tcp-reset<\/p>\n
iptables -A INPUT -i ppp0 -p udp -j REJECT --reject-with icmp-port-unreachable<\/p>\n
\u8fd9\u6837\u5c31\u597d\u591a\u4e86\uff0c\u9ed1\u5ba2\u867d\u7136\u80fd\u626b\u63cf\u51fa\u6211\u4eec\u6240\u5f00\u653e\u7684\u7aef\u53e3\uff0c\u4f46\u662f\u4ed6\u5374\u5f88\u96be\u77e5\u9053\uff0c\u6211\u4eec\u7684\u673a\u5668\u5904\u5728\u9632\u706b\u5899\u7684\u4fdd\u62a4\u4e4b\u4e2d\u3002\u5982\u679c\u4f60\u53ea\u8fd0\u884c\u4e86ftp\u5e76\u4e14\u4ec5\u4ec5\u5bf9\u5c40\u57df\u7f51\u5185\u90e8\u8bbf\u95ee,\u4ed6\u5f88\u96be\u77e5\u9053\u4f60\u662f\u5426\u8fd0\u884c\u4e86ftp\u3002\u5728\u6b64\u6211\u4eec\u7ed9\u4e0d\u5e94\u8be5\u8fdb\u5165\u6211\u4eec\u673a\u5668\u7684\u6570\u636e\uff0c\u4e00\u4e2a\u6b3a\u9a97\u6027\u7684\u56de\u7b54\uff0c\u800c\u4e0d\u662f\u4e22\u5f03(drop)\u540e\u5c31\u4e0d\u518d\u7406\u4f1a\u3002\u8fd9\u4e00\u4e2a\u529f\u80fd\uff0c\u5728\u6211\u4eec\u8bbe\u8ba1\u6709\u72b6\u6001\u7684\u9632\u706b\u5899\u4e2d(\u6211\u8fd9\u91cc\u8bb2\u7684\u662f\u9759\u6001\u7684\u9632\u706b\u5899)\u7279\u522b\u6709\u7528\u3002<\/p>\n
\u4f60\u53ef\u4ee5\u4eb2\u81ea\u64cd\u4f5c\u4e00\u4e0b\uff0c\u770b\u4e00\u770b\u4fee\u6539\u524d\u540e\u7528namp\u626b\u63cf\u5f97\u5230\u7684\u7ed3\u679c\u4f1a\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f<\/p>\n
12\u3001\u8fd9\u4e2a\u6559\u7a0b\u6211\u60f3\u5230\u6b64\u5c31\u7ed3\u675f\u4e86\uff0c\u5176\u4e2d\u6709\u5f88\u591a\u4e1c\u897f\u5728\u8fd9\u91cc\u6ca1\u6709\u63d0\u5230\uff0c\u5982ip\u4f2a\u88c5\uff0c\u7aef\u53e3\u8f6c\u53d1\uff0c\u5bf9\u6570\u636e\u5305\u7684\u8bb0\u5f55\u529f\u80fd\u3002\u8fd8\u6709\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u4e1c\u897f\u5c31\u662f\uff1aiptables\u5904\u7406\u6570\u636e\u5305\u7684\u6d41\u7a0b.\u5728\u8fd9\u91cc\u6211\u60f3\u544a\u8bc9\u4f60\uff0c\u4f60\u8bbe\u7f6e\u7684\u8fc7\u6ee4\u89c4\u5219\u7684\u987a\u5e8f\u5f88\u91cd\u8981\uff0c\u5728\u6b64\u4e0d\u5b9c\u8be6\u7ec6\u4ecb\u7ecd\uff0c\u56e0\u4e3a\u8fd9\u6837\u4e00\u6765\uff0c\u8fd9\u4e2a\u6559\u7a0b\u5c31\u4f1a\u62d8\u6ce5\u4e8e\u7ec6\u8282\u3002<\/p>\n
iptables\u662f\u590d\u6742\u7684\uff0c\u6211\u5728linuxsir\u4e0a\u770b\u8fc7\u5f88\u591a\u6559\u7a0b\uff0c\u5b83\u4eec\u5f80\u5f80\u591a\u800c\u5168\uff0c\u53cd\u800c\u8ba9\u4eba\u671b\u800c\u751f\u754f\uff0c\u5e0c\u671b\u6211\u7684\u8fd9\u4e2a\u6559\u7a0b\uff0c\u80fd\u591f\u6307\u5bfc\u4f60\u5165\u95e8\u3002\u52a0\u6cb9\uff01<\/p>\n
\u6700\u540e\uff0c\u6211\u628a\u5b8c\u6574\u7684\u811a\u672c\u5199\u51fa\u6765\u5982\u4e0b\uff0c\u4f60\u53ea\u8981\u4fee\u6539\u5e38\u91cf\u5b9a\u4e49\u90e8\u5206\uff0c\u5c31\u80fd\u8868\u73b0\u51fa\u8f83\u5927\u7684\u4f38\u7f29\u6027^_^<\/p>\n
#!\/bin\/bash<\/p>\n
# This is a script<\/p>\n
# Edit by liwei<\/p>\n
# establish a static firewall<\/p>\n
# define const here<\/p>\n
Open_ports=\"80 25 110 10\" # \u81ea\u5df1\u673a\u5668\u5bf9\u5916\u5f00\u653e\u7684\u7aef\u53e3<\/p>\n
Allow_ports=\"53 80 20 21\" # internet\u7684\u6570\u636e\u53ef\u4ee5\u8fdb\u5165\u81ea\u5df1\u673a\u5668\u7684\u7aef\u53e3<\/p>\n
#init<\/p>\n
iptables -F<\/p>\n
iptables -X<\/p>\n
iptables -t nat -F<\/p>\n
iptables -t nat -X<\/p>\n
# The follow is comment , for make it better
\n# iptables -P INPUT DROP<\/p>\n
iptables -A INPUT -i ! ppp0 -j ACCEPT<\/p>\n
# define ruler so that some data can come in.<\/p>\n
for Port in \"$Allow_ports\" ; do
\nptables -A INPUT -i ppp0 -p tcp -sport $Port -j ACCEPT
\niptables -A INPUT -i ppp0 -p udp -sport $Port -j ACCEPT
\ndone<\/p>\n
for Port in \"$Open_ports\" ; do
\niptables -A INPUT -i ppp0 -p tcp -dport $Port -j ACCEPT
\niptables -A INPUT -i ppp0 -p udp -dport $Port -j ACCEPT
\ndone<\/p>\n
# This is the last ruler , it can make you firewall better
\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","protected":false},"excerpt":{"rendered":"
\u6807\u9898: iptables\u5165\u95e8\u6559\u7a0b–\u8bbe\u7f6e\u9759\u6001\u9632\u706b\u5899\uff08 step by step\uff09 iptables\uff0d\uff0d\u9759\u6001\u9632\u706b\u5899\u5b9e\u4f8b\u6559\u7a0b follow me \u4ecb\u7ecd\uff1a \u8fd9\u7bc7\u6587\u7ae0\u662f\u672c\u4eba\u539f\u521b\uff0c\u5411\u8bfb\u8005\u5c55\u793a\u4e86\u5982\u4f55\u4e00\u6b65\u4e00\u6b65\u5efa\u7acb\u9759...<\/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-119","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\/119","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=119"}],"version-history":[{"count":0,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=\/wp\/v2\/posts\/119\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.liangliang.org.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}