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 thats not default in filter and nat table.,　　#,　　/usr/local/sbin/iptables -X,　　/usr/local/sbin/iptables -t nat -X,