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iptables -t filter -A FORWARD -i $LAN_INTERFACE -o $WAN_INTERFACE -s $LAN_    NETWORK -d $WAN_NETWORK -p all -m state --state ! INVALID           -j ACCEP    T
iptables -t filter -A FORWARD -i $WAN_INTERFACE -o $LAN_INTERFACE -s $WAN_    NETWORK -d $LAN_NETWORK -p all -m state --state ESTABLISHED,RELATED -j ACCEP    T