forward again

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hello
when i want forward ip > to > ip. (.51 > 58)
what i must do that it works? maybe a rule too on the destination adre to
reply with other source ip??
thx bye
--------------tables--------
echo "1" > /proc/sys/net/ipv4/ip_forward
iptables -I FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

iptables -F FORWARD
iptables -t nat -F


iptables -A FORWARD -p udp -d xx.xxx.xx.58 --dport 27021 -j ACCEPT
iptables -A PREROUTING -p udp -d xx.xxx.xx.51 --dport 27021 -j DNAT --to
62.116.24.58:27021
iptables -A FORWARD -p tcp -d xx.xxx.xx.58 --dport 27021 -j ACCEPT
iptables -A PREROUTING -p tcp -d xx.xxx.xx.51 --dport 27021 -j DNAT --to
xx.xxx.xx.58:27021




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