centos6.5iptables默认配置
# Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
查看规则
iptables -nL --line-number
插入规则
iptables -I INPUT -p tcp --dport 8080 -j ACCEPT
更改规则
iptables -R INPUT 1 -p tcp --dport 8000 -j ACCEPT
iptables -R INPUT 1 -p tcp -s 10.240.240.56 --dport 8000 -j ACCEPT
删除规则
iptables -D INPUT 6
保存与重启
/etc/init.d/iptables save
/etc/init.d/iptables restart
导出与导入
cd /etc/sysconfig
iptables-save > iptablesRules
iptables-restore <iptablesRules
原文：http://xoyabc.blog.51cto.com/7401264/1659225