NAT Settings

[#1]

When i first got my BT Voyager 2110 ADSL Router the NAT settings were Open, nowm, for some unexplained reason its been changed to Moderate (2). Now for Xbox LIVE it can restrict me playing with people, chatting with them etc. Is there anyway i can change these settings? Need to know ASAP

[#2]

You will need to open the ports on your router to open your NAT for xbox live.  try going here, there is a guide for opening the ports on your router.
http://portforward.com/english/routers/port_forwarding/BT/Voyager2100/Xbox_Live_360.htm
Failing that try enabling Upnp.
Sorry disabling Upnp

[#3]

But the best thing to do really is to do what i do, set your xbox to DMZ plus mode.  All traffic will go straight to your xbox unmonitored.