First post to this forum, so thanks in advance. I'd appreciate any sage advice anyone might have on the following scenario.

Mac OSX.2.3
Under System Preferences/Internet & Network/Sharing/Firewall/New, I've enabled the preconfigured Gnutella/Limewire port 6346.

I'm running a wireless network over a cable modem using an Air Port base station, so I went into the Air Port Admin Utility/Port Mapping, and added port 6436 as a "Public Port".

From reading the posts this forum (very useful), I assume that I SHOULD now force my IP address to enable other users to upload.

So which one do I force: the "public" IP I get using DHCP from my ISP (confirmed by whatismyipaddress.com) , or do I force the "private" IP address (the 10.*.etc ) that my Airport is using to call my machine?

Perhaps it is worth mentioning that under System Preferences/Network, I am running on autopilot. That is to say that both my ISP and my Air Port config settings are set to DHCP, and I haven't chosen to manually add any addresses here.

Clients behind a NAT can never download from other from other clients behind a NAT unless they setup port forwarding. This however is usually not possible with air ports. - Do not force your IP address unless you enabled port forwarding.

Everybody who can download a files with LimeWire is also able to upload files with LimeWire (in theory). If you are using air port you will not see many uploads, though unless you are sharing really popular files.