Lower the that NAT number the better--- I had issues forever with my old netgear router..... I forwarded all the required ports and still it sucked....
I finally resolved my issues by running wired connection to the modem directly---bypassing the router--- this give NAT 1--- no issues at all after doing this... however this places your PS3 "out there" with zero firewall protection.
I recently bought a new router (a new netegear gigabit router)-- I set it up correctly again and got NAT 2 and have no issues---
I will agree with the above that GTA IV is very fickle....
Here is what you need to to do to at least try and configure your router to work with GTA IV.
1. Wired connection-- don't even mess with running wireless--- any interference can drop your connection--- running wired is best.
2. You need to set a static (local) ip address for your PS3-- you CAN do this with the PS3 in the settings but may be easier to set it from your router if it supports this... you will need to log into the router-- and determine the which connection is your PS3s and then change it to an IP address that is unique for it... you do NOT want to set it as a low number in the range of IP addresses that the router will assign--- this is especially important if you set the IP address from the PS3.... for example if the router assigns IP addresses starting a. 101 and goes up from there... then set it up like .130 or so..... this is so another PC or whatnot won't take that IP address when it connect...( I am abbreviating the IP address.... it will be something like 192.168.1.130 or 192.168.0.130...
Some routers start at .2 and go up from there... in which case you will want it to be .30
3. After you set the static IP address for the PS3 you will need to forward the appropriate ports to the PS3's IP address... the easiest way to do this is to use this site---
http://portforward.com/english/routers/por...routerindex.htm find your router and then after you select you router model it will load a page showing a list of games.... find PLAY STATION NETWORK and click on it-- it will open up a page showing screen shots of your router and guide you on how to forward them for your router-- the list here will include the ports needed for GTA IV....
They will include Ports 80, 443, 5223, 3478, 3479, and 3658--- follow the directions closely and save ther router settings when done-- you will be forwarding them to the static IP address you set for the PS3... the router will be directing the internet traffic to that IP address through the holes you created in your firewall....
If you cannot set a static IP address from your router any one of a number of videos on youtube can walk you through how to set one on your PS3....
http://www.youtube.com/results?search_quer...1365.3j7j1.11.0.
good luck.... HTH
This post has been edited by Spuds725 on Friday, Apr 20 2012, 20:06