Seen a lot regarding this CGNAT you mention and the way mobile comes into the house as opposed to conventional line broadband ?
To be honest i do not really know what this CGNAT means or for that matter what is Ipv4 means' have seen mention that if it was Ipv6 it would not have the Nat issues.
I asked about online gaming with this mobile broadband and EE told me there would not be any issues which in reality is not true.
Have been on the EE forums and this NAT is a common problem and as of yet i have not found a single fix, played with the server settings on the playstation as mentioned by posts that i have found but to no avail and running the test i still get Type 3 regardless of what changes i make inside the EE router or consoles.
I would have thought switching the DMZ button to on would have solved this problem, however nothing changes which is odd ?
This below is one of many posts regarding this issue on the EE Mobile 4g forums.
Re: 4gee wifi box PS4 nat type 3 issue
‎10-02-2018 07:35 PM
EE mobile network uses Carrier Grade NAT (CGNAT), which means that you don't get your own public IP address but share it with other users. So you can't be uniquely id'ed on the Net. This is unlike fixed BB.
If you think I helped please feel free to hit the "Star" button below.
To phone EE: The local rate landline number 020 7362 0200 or Freephone 0800 079 8586 - Option 1 for Mobiles; Option 2 for 4G WiFi; Option 3 for Home Broadband & EE TV.
ISPs: 1999: Freeserve 48K Dial-Up => 2005: Wanadoo 1 Meg BB => 2007: Orange 2 Meg BB => 2008: Orange 8 Meg LLU => 2010: Orange 16 Meg LLU => 2011: Orange 20 Meg WBC
Edited by time2die (Sun 30-Sep-18 10:55:12)