First off you will need to open specific ports for the PlayStation network traffic to go through. Log into your router set up in the web browser and go into the Advanced tab- you will find the Port Forwarding here. Once here click on "Applications" on the left side. You should see something caled 'Special Applications" on the page. Click the small button that says "enable" then, one set at a time, add in the following ports:
• TCP Ports: 80, 443, 5223, and 10070 - 10080
• UDP Ports: 3478, 3479, 3658, and 10070
In the name blank you can put "PlayStation 3" 9this is more an identifier for you to remind you what's using the ports). Now, for the port numbers on their own put the same number in the port range blanks and select the corect type out of the drop down menu (TCP or UDP). Public port should use the same numbers and type. Click the Apply button.
Once you have all of the numbers in you will need to power down your connection for about 30 seconds. Unplug the router and the modem. After a few seconds plug the modem back in and wait for the lights to show normal connections. Then plug the router back in. This should get you to NAT 2 and let you get gaming!