WRT54G 2.2- Xbox 360's NAT setting is Moderate, please help!

Question

Ok, here's the story...normally i always have the 360's network settings to 'automatic' , but since the new Live update i've been having lots of trouble, like : I try to start a private chat with someone, but the person isn't able to join me or when i try to join their chat/party it doesn't work.
However, just now when that person was already in a party with someone, i WAS able to join...but as soon as i get an invite from that person when he's got no one else in the party...it doesn't work.
So i started to check the net for advice...and i found another forum where they said i had to do a few things.
http://www.portforward.com/networking/staticip.htm
I made a static IP for Vista and Xbox 360. And finally this
http://www.portforward.com/english/routers/port_forwarding/Linksys/WRT54G/Xbox_Live_360.htm
Then i test the Live connection, and everything is fine it seems, but at the end i receive an error about how my NAT is Moderate. It then gives suggestions such as, to check if you have enabled UpnP on the router...which i have. It advices you to turn off the router and/or modem for a few minutes...nothing of that makes a change here sadly.
That forum also told me to open these ports.
Port: 1900
Naam: UPnP Framework
Protocol: UDP
Scope: My network (subnet) only
Port: 2290
Naam: Remote Media Center Experience
Protocol: TCP
Scope: Any computer (including those on the Internet)
Port: 3376
Naam: Media Center Extender Service
Protocol: UDP
Scope: Any computer (including those on the Internet)
Port: 5555
Naam: Media Streaming (Media Connect)
Protocol: TCP
Scope: My network (subnet) only
Port: 7777
Naam: Network Validation
Protocol: UDP
Scope: My network (subnet) only
and put them here
http://www.portforward.com/english/routers/port_forwarding/Linksys/WRT54G/WRT54G4.jpg
Everything all fine and dandy...the problem though is..what do i fill in as the last few numbers of their IP adresses? Here it looks like this now 
http://img224.imageshack.us/img224/9774/29330189nt9.jpg

Answer 1

Open an Internet Explorer browser page.In the address bar type - 192.168.1.1
Leave username blank & in password use admin in lower case...
Click on "Applications and Gaming" tab and then click on "Port Range Forwarding" subtab...
1) On the first line in Application box type in ABC, in the start box type in 88 and End box type in 88, leave the protocol as both and under ip address type in 192.168.1.20 and check the enable box...
2) On the second line in Application box type in PQR, in the start box type in 3074 and End box type in 3074, leave the protocol as both and under ip address type in 192.168.1.20 and check the enable box...
3) On the third line in Application box type in XYZ, in the start box type in 53 and End box type in 53, leave the protocol as both and under ip address type in 192.168.1.20 and check the enable box and click on Save Settings...
3) Once you return to the set up page click on the Security tab and uncheck Block Anonymous Internet Requests and click on Save Settings...
4) Click on set-up and change the MTU Size to 1452 and click Save Settings...
5) Goto the XBox Network Settings and IP Address Settings and select manual IP Settings and assign the following on your Xbox
IP Address :- 192.168.1.20, Subnet Mask :- 255.255.255.0, Default Gateway :- 192.168.1.1...
6) Also assign the DNS Addresses on the Xbox
Primary dns :- 4.2.2.2...Secondary dns :- 192.168.1.1
7) Turn off your modem, router, and Xbox...Wait for a minute...
8) Plug the modem power first, wait for another minute and plug the router power cable, wait another minute and turn on the Xbox and test it...it will connect...