Well Im using a different router now but I'm not sure wheter my Nat is open or strict. The new xbox dashboard does not show wheter its open nat or strict any way of finding this out? At times I find hard time getting games on MW2.
if you do a live test on the system > Network > options, and it says connected to xbox live at the end of the test its open.. If you do the test, it'll say " your router is set to strick or moderate", if it's strict or moderate.