重置默认策略.

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

复位NAT的默认策略

iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT

复位mangle的默认策略

iptables -t mangle -P PREROUTING ACCEPT
iptables -t mangle -P OUTPUT ACCEPT

刷新所有的规则、NAT、mangle

iptables -F
iptables -t nat -F
iptables -t mangle -F

清除所有不是默认的过滤和NAT表。

iptables -X
iptables -t nat -X
iptables -t mangle -X

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最终如下

iptables -P INPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT
iptables -t mangle -P PREROUTING ACCEPT
iptables -t mangle -P OUTPUT ACCEPT
iptables -F
iptables -t nat -F
iptables -t mangle -F
iptables -X
iptables -t nat -X
iptables -t mangle -X

将变更规则存入

/etc/rc.d/init.d/iptables save

重启iptables

service iptables restart

查看现有规则

iptables -L -n