IOT2000_BuildRoot/board/PSG/iot2000/rootfs_overlay/root/portfwd.sh

#!/bin/sh
#

del_portfwd () {
DESTPORT=$1
DESTIP=$2
SRCPORT=$3
SRCIP=$4
SRCIFACE=$5

iptables -t nat -D PREROUTING -p tcp -i $SRCIFACE --dport $SRCPORT -j DNAT --to-destination $DESTIP:$DESTPORT 2> /dev/null
iptables -D FORWARD -p tcp -d $SRCIP --dport $SRCPORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT 2> /dev/null

}

set_portfwd () {
DESTPORT=$1
DESTIP=$2
SRCPORT=$3
SRCIP=$4
SRCIFACE=$5

del_portfwd $1 $2 $3 $4 $5

iptables -t nat -A PREROUTING -p tcp -i $SRCIFACE --dport $SRCPORT -j DNAT --to-destination $DESTIP:$DESTPORT
iptables -A FORWARD -p tcp -d $SRCIP --dport $SRCPORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

}

set_portfwd 80 192.168.0.100 81 192.168.7.2 usb0
set_portfwd 80 192.168.0.100 81 `ifconfig eth0 2>/dev/null|awk '/inet addr:/ {print $2}'|sed 's/addr://'` eth0
set_portfwd 80 192.168.0.100 81 `ifconfig tun5 2>/dev/null|awk '/inet addr:/ {print $2}'|sed 's/addr://'` tun5