Opening Ports on Airport Express for GTA IV

Hello Psychos40. Welcome to the Apple Discussions!

On my Windows 2000 machine, using the AirPort Admin Utility, when I configure the AirPort, I get a window that has a "port mapping" tab.
Is this how I open the ports listed above? If so, it asks for a private IP address, Public Port, and Private port. How do all these relate to the port numbers above?

Yes.

To setup Port Mapping:
Assign a manual IP to the host device
The "host" device is the computer that will be hosting GTA and needs to be accessed from the Internet. Under Windows 2000, you would use Network Settings to assign a static IP address to this computer. Note: Be sure to assign an IP address outside of the DHCP range provided by the AirPort Express Base Station (AX) default range of 10.0.1.2 - 10.0.1.200, like 10.0.1.201

To setup port mapping on an AirPort Express Base Station (AX), connect to the AX's wireless network, and then use the AirPort Admin Utility to change these settings:

Port Mapping tab
o Click "Add"
o Public Port: <enter the Port # which will be accessed from the Internet>
o Private Address: <enter the static IP address from above>
o Private Port: <either enter the same value as the Public port or the value you want your application/service to answer on>
o Click "Ok"
o Repeat the last series of steps for each port you wish to map.

In the configure base station window, i can't find any mention of how to enable UPnP

Unfortunately, that's because the AirPorts do not support UPnP. Instead, the AirPorts have a similar feature known as "NAT Port Mapping Protocol." You enable/disable this function on the Ethernet Port Security tab under Base Station Option within the AirPort Admin Utility. Note: Although NPmP is similar, it is not the same as UPnP and may not offer the same features. If GTA requires UPnP, the AirPort's NPmP feature may not support it.

I think I understand the port mapping now, however based on the info you provided, it doesn't seem like I can distinguish between UDP and TCP ports, since nowhere in the port mapping tap does it talk about this. Is there a difference, and what do I do if there is?

There is a difference, but the AirPort Admin Utility treats them the same.

Also, when you say "The "host" device is the computer that will be hosting GTA ", I believe in my case this would be the PlayStation3, not my actual computer.

Yes, in this case your PS3 would be the host device and it would have to be assigned a static IP address.

If you set the PS3's static IP address in the 10.0.1.x range, then the Subnet Mask = 255.255.255.0 & the Router Address = 10.0.1.1. The DNS server(s) should be the ones your ISP provides you.