D-Link DSL 2640B Port forwarding issue

Hi, I use the D-Link 2640B Firmware Version: EU_3.07 Hardware Version: B2 with 2 computers.
I use Windows Vista 64 bit and I recently setup an OpenSim standalone grid ( connection with the Hippo Viewer is http://127.0.0.1:9000 -

which doesn't go on the web ), so now i want to allow others now to access it via the internet, first of all my IP is DHCP dynamic, so i setup

a DHCP static IP for both of the computer in the router setup, both with an internal IP start of 192.168.1.XX, and also in network settings i

entered this instead of obtaining an IP and i still get on the internet fine !!
I need to forward port 9000 TCP/UDP in the router from my external IP to my internal IP, but when i do this i still can't connect with the

Hippo Viewer, i've tried entering the external IP address into the hippo viewer with :9000 and nothing, no-one else can connect to my

computer via the internet. I 've followed various tutorials, ie;

http://metaversebuilders.wordpress.com/2008/06/24/opensim_installation_part_three/

and still nothing :-(...............
I have also made an account with DynDNS so this gives me a static IP for my external IP.
Can you help and is there something i'm not doing? hope you understand :-)
Regards
Gary