Warframe: Strict NAT Detected

You need ports:

• TCP 80
• UDP 2302 and 2303 (2302 is the host listener port -- the one you need to be able to host games)

I'm not sure about the IP forwarding issue, but try opening these ports and providing your external IP to your friends. Check out setting your machine as the DMZ host a la this question. DMZ host settings can solve the problem by making your machine the first machine to get information from a shared ip address if the router can't figure out where to send the packets.

EDIT: From the Halo multiplayer support site

Issue: You cannot join a direct Internet Protocol (IP) multiplayer game that is hosted behind a Network Address Translator (NAT) or router, or on an Internet Connection Sharing Server in Microsoft Windows 98 Second Edition, Microsoft Windows Millennium Edition (Me), or Microsoft Windows 2000

Solution: You have to join multiplayer games that are hosted behind a router or on an Internet Connection Sharing server by means of the external GameSpy Arcade Lobby

Here's the thing about data transfer and the device it's connected to. While I suggest you keep looking for a fix, the main thing about Bandwidth utilization is that even if a great quantity of data is being sent to your PS3 by your router, it's dedicated network processor can only process so much data, and Sony limits this to save on procedural resources to the highest necessary speed.

The PS3 uses a CELL processor setup with several modular CPUs, but just 256 MB of ram, so its ability to receive and process incoming data is quite limited.

I would still suggest you stick with the wired connection to limit latency.