Internet is perfectly working but no way to port forward.Any Help?

In the attached images there are my wl500g and modem configurations.
Internet works wery well but I can't set up any working port forwarding.
Somebody pleaze can help me?
Thanx

Try telnet to router (if you use Oleg's Firmware) and try something like this (16000 is Port, 192.168.1.2 - IP of PC in your internal area)

iptables -I FORWARD -p tcp --dport 16000 -j ACCEPT
iptables -t nat -A PREROUTING -i vlan1 -p tcp --dport 16000 -j DNAT --to-destination 192.168.1.2

Thanks a lot.
But still doesn't work.
I telnet to router this:
iptables -I FORWARD -p tcp --dport 2234 -j ACCEPT
iptables -t nat -A PREROUTING -i vlan1 -p tcp --dport 2234 -j DNAT --to-destination 192.168.1.2
(where 2234 is the port i'm interested in).
All firewalls disabled
Port trigger, Virtual DMZ and Virtual Server are disabled on the router

The port forward log of the router is :
"Destination ALL Proto. TCP Port Range 2234 Redirect to 192.168.1.2"

(my external ip is 80.117.71.232).

Now it works!
The problem of the port forwarding was not on the router.
It was a modem problem: my linksys adsl2mue modem was configured with a pPOA connection.this enables a kind of router function on the modem.
Now i use the modem bridge function with the pPOE connection on the router.
In this way the port forwarding works perfectly.