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有最基本的作用。。
# Generated by iptables-save v1.4.7 on Wed Sep 7 14:51:32 2016 *filter :INPUT ACCEPT [9:396] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [347:287188] -A INPUT -i lo -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m tcp --dport 21 -j ACCEPT -A INPUT -p tcp -m tcp --dport 80 -j ACCEPT -A INPUT -p icmp -m icmp --icmp-type 8 -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A FORWARD -p tcp --syn -m limit --limit 1/s --limit-burst 5 -j ACCEPT -A FORWARD -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK RST -m limit --limit 1/sec -j ACCEPT -A FORWARD -p icmp -m icmp --icmp-type 8 -m limit --limit 1/sec -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT # Completed on Wed Sep 7 14:51:32 2016
好久没弄了，来个最简的centos下的Iptables文件存照吧。
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原文地址：http://www.cnblogs.com/aguncn/p/5854503.html
