NAT 3 inseamna ca e o conexiune foarte restrictiva(ceea ce este incorect din punct de vedere al gamerului ).

Why do I have NAT Type 3? How can I get NAT Type 2?

NAT Type 3 means the PS3 is behind a very restrictive connection. It is difficult for other PS3s across the internet to reach yours. Sometimes there are two routers in line, with one scrambling the connection data of the other. Sometimes the internet service provider provides you with a modem that performs NAT/routing for protection (think 'firewall'). If you use your own router behind this type of modem (sometimes called a 'gateway'), then you will have to turn off the routing on the modem (sometimes called 'bridging'). Some modems will move you from NAT Type 3 to NAT Type 1 if you put the PS3 in the DMZ.