/usr/local/sbin/iptables -P INPUT ACCEPT

　　/usr/local/sbin/iptables -P FORWARD ACCEPT

　　/usr/local/sbin/iptables -P OUTPUT ACCEPT

　　#

　　# reset the default policies in the nat table.

　　#

　　/usr/local/sbin/iptables -t nat -P PREROUTING ACCEPT

　　/usr/local/sbin/iptables -t nat -P POSTROUTING ACCEPT

　　/usr/local/sbin/iptables -t nat -P OUTPUT ACCEPT

　　#

　　# flush all the rules in the filter and nat tables.

　　#

　　/usr/local/sbin/iptables -F

　　/usr/local/sbin/iptables -t nat -F

　　#

　　# erase all chains thats not default in filter and nat table.

　　#

　　/usr/local/sbin/iptables -X

　　/usr/local/sbin/iptables -t nat -X