UDP PORT FORWARDING

[chandrakant]

hi everyone
i have some problem in port forwarding for udp packets if i trasfer udp port
such as


iptables -A INPUT -p udp -s 0/0 -d 192.168.10.1 --dport 1701 -j ACCEPT
iptables -A OUTPUT -p udp -s 0/0 -d 192.168.10.1 --dport 1701 -j ACCEPT

if i transfer these packet those recive on udp port to another machine

iptables -t nat -A PREROUTIONG  -s 0/0 -d 192.168.10.1  -p udp --dport 1701 -j
DNAT --TO-DESTINATION 192.168.10.2:1701

ITS NOT REDIRECTING THESE PAKETS.IN PORTSCANNER IT NOT SHOWING ME REDIRECTIED

HOW TO SOLVE THIS