I know the feeling. All you want to do is play online but suddenly this 3 letter monster just smacks you in the face and says "YOU SHALL NOT PASS". Well screw you too Gandalf, I'm going to figure this out. And this is why you're here. This blog post will teach you how to open up your NAT type.
First, I want you to watch this video. I explain the process step by step and at one point, I will ask you to go back and visit this blog as it contains vital information to opening your NAT type. Hopefully you can get NAT type 2 before you need to visit this page again.
I see you're back and the first two methods I dicussed failed. I feel you. So you're still NAT type strict, or NAT type failed on your PS4, this is where I show you method 3. Now I won't discuss the specifics, lets just go straight to the method. Thank you to Brenn Rayos for this method.
Connect your PC to the Modem. Then connect your Modem to the Router.
Windows: open CMD then type ipconfig
Call your ISP and ask them your PPPOE username and Password. If they ask, tell them you'll put your modem and router in bridge mode. That username/password is yours so they have to give it to you. EXAMPLE: (username: email@example.com, password: *******)