Good post Dek, however I'm not sure how many of us can get away with being the
sole user of the internet through our PS3....I know if I told the family I'm just starting a race so you won't have access to the internet until I'm finished, my online race career would end there! LOL
Technically NAT 1 is the best but from what I have read the overheads in using a NAT 2 connection are so minimal that it really shouldn't have that much affect on gameplay with the advantage of connecting through a router and using NAT 2 being that the internet use can continue to be shared (but I am no networking expert).
Also from what I can gather, running both DMZ and Port Forwarding rules is counter-intuitive - you should only need to do one or the other (providing a static IP address has been set on the PS3 and router).
Manually forwarding ports to a specific IP address on your network is the most secure way but the easiest would be to just run a DMZ to that same IP address, which forwards ALL ports automatically to that IP address, effectively doing the same thing (and would also help when playing other online games, which may use different ports to GT6).
Here is an interesting link worth reading (even though it is on a Call of Duty forum), it still should be relevant:
https://community.callofduty.com/thread/100391969
In my mind, a NAT 2 connection is sufficient and as long as the user is running a static IP and potentially a DMZ they should be minimising themselves to issues whilst still allowing others in the house to access the net (which is likely an important consideration for many), and short of other users in the house streaming video or torrenting, checking Facebook or Googling shouldn't affect online gameplay too much ( dependant of course on the many varying things that make up a person's internet connection).
The biggest hurdle to overcome is still the PSN and its glitches (along with your line speed & latency to/from the PSN servers) - which depending on the quality of the physical line to your house and the distance the line travels from the exchange (for ADSL connections), nothing you can do can improve that significantly.
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