Port forwarding + ovpn

client.ovpn

client
# put the line below to disable tunneling outcoming trafic
route-nopull
....

forward.sh

export DEST_IP=10.8.0.139
export DEST_PORT=5000
export LOCAL_EXPOSE_PORT=80

sudo iptables -t nat -A PREROUTING -p tcp -i eth0 --dport $LOCAL_EXPOSE_PORT -j DNAT --to-destination $DEST_IP:$DEST_PORT
sudo iptables -A POSTROUTING -t nat -p tcp -d $DEST_IP --dport $DEST_PORT -j MASQUERADE
sudo iptables -A FORWARD -p tcp -d $DEST_IP --dport $DEST_PORT -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT