I tried doing this. It still says NAT 3.To port forward you have to assign your console to a fixed IP.
Otherwise next time you start your console the IP its on could change.
These are the ports needed for Playstation.
TCP: 1935, 3478-3480
UDP: 3478-3479, 3074
Tried calling Telstra. They can't help me unless I go to Telstra Platinum which is a paid service. **** me.