如何恢复iptables的默认设置

/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 that's not default in filter and nat table.

#

/usr/local/sbin/iptables -X

/usr/local/sbin/iptables -t nat -X'