如何恢复iptables的默认设置

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/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‘
from: http://www.7880.com/info/Article-657b9d40.html