I recently started to have trouble with connecting to other players. A while ago, I had to set a custom DNS because my college dorm's wifi is considered Strict. since I cannot mess with the internet source, am I stuck with NAT type 3?
I really want to play with my ACVD team leader, but I just can't connect to him. I can connect with everyone else, so I don't see this being a major problem. Its more of an annoyance.
Unless you can speak with the administrators of your wifi system to see if they can offer up any advice, or maybe also speak with other owners of PS3's or XBOX's to see if they can help, then yes, it looks like you're stuck.
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