Mine

#!/bin/bash

iptables --flush
iptables --table nat --flush
iptables --delete-chain
iptables --table nat --delete-chain

iptables --table nat -A POSTROUTING  -o ppp0 -j MASQUERADE
iptables -A FORWARD --in-interface eth0 -j ACCEPT

iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 6888 -j DNAT --to 192.168.0.8:6888
iptables -A FORWARD -p tcp -m state --state NEW --dport 6888 -i eth0 -j ACCEPT

iptables -A PREROUTING -t nat -i ppp0 -p udp --dport 27960 -j DNAT --to 192.168.0.8:27960
iptables -A FORWARD -p udp -m state --state NEW --dport 27960 -i eth0 -j ACCEPT

iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 27960 -j DNAT --to 192.168.0.8:27960
iptables -A FORWARD -p tcp -m state --state NEW --dport 6888 -i eth0 -j ACCEPT

iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 33302 -j DNAT --to 192.168.0.3:33302
iptables -A FORWARD -p tcp -m state --state NEW --dport 33302 -i eth0 -j ACCEPT

#iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 6881 -j DNAT --to 192.168.0.8:6881
#iptables -A FORWARD -p tcp -m state --state NEW --dport 6881 -i eth0 -j ACCEPT

iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 29182 -j DNAT --to 192.168.0.8:29182
iptables -A FORWARD -p tcp -m state --state NEW --dport 29182 -i eth0 -j ACCEPT

iptables -A PREROUTING -t nat -i ppp0 -p tcp --dport 2300 -j DNAT --to 192.168.0.8:2300
iptables -A FORWARD -p tcp -m state --state NEW --dport 2300 -i eth0 -j ACCEPT


iptables -A PREROUTING -t nat -p tcp --dport 4170 -j DNAT --to-destination 192.168.0.8:4170
iptables -A FORWARD -p tcp -m state --state NEW --dport 4170 -i eth0 -j ACCEPT