speed stream 4200 and 4300 PS3 and Xbox Nat issues
Ive had the same issue with the speedstream 4200 and 4300 series modems from windstream. You need to log into windstream modem admin, admin for u.n. and pass, go to setup then firewall then dmz. Put the ip the modem gave your router into the dmz. Make sure you have make settings permanent checked. This should fix your NAt problem.