iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 4662 -j DNAT --to-destination 10.0.0.51

for ((  i = 6000 ;  i <= 6100 ;  i++  ))
do
 iptables -t nat -A PREROUTING -i eth0 -p tcp --dport $i -j DNAT --to-destination 10.0.0.51
done

for ((  i = 6881 ;  i <= 7881 ;  i++  ))
do
 iptables -t nat -A PREROUTING -i eth0 -p tcp --dport $i -j DNAT --to-destination 10.0.0.59
done