Netflix (and other streaming apps) are only available on the US PSN store, and so to get access to those you will need to create a US PSN account. Once created and once the apps are downloaded and installed, they will appear within your primary PSN account, so the US PSN account is just a temporary one so the apps can be downloaded.
The DNS settings listed on the Overview page can be input to your router, for the entire network, or directly to your PS3 through Settings > Network Settings > Internet Connection Settings. You won’t need to change the DNS settings on your PS3 if you have already done so via your router.
1 Create a New User
Start by creating a new user on the PS3. You can choose whatever name you want, it doesn't have to match your PSN name. After you create the user, click on the newly created user icon and log in as the new user.
2 Create a New PSN Account
Next, make your way to the PlayStation Network section, and select the Sign Up link. In the screen that opens, choose to create a new account.
In the next screen, make sure you select United States as your country, the other entries can be filled in any way you like.
Next, enter you email address and a suitable password.
Next, enter an online ID - this doesn't have to be the same as your PS3 account username.
Next, fill in a US address. You can create a fake one and use a valid ZIP code, however, it's advisable to use a real US address. Look up the address of a hotel or shopping center.
Continue on through the steps until your new PSN account is created.
3 Download and Install the Streaming Apps
Next, make your way to the PSN Store and browse for apps. The Netflix and Hulu Plus apps should be there.
Once downloaded and installed to your PS3, the video apps will show up under the “TV/Video Services” section, and it will be available in all of your PS3 accounts. So you can go back to your primary PSN account and the installed apps will all be there.