posted 13 years ago
Not knowing anything about your networking setup, I'd just assume you're going through cable/DSL/fiber so all the outside world would see is that IP address. That's not a reasonable way to find out IP addresses--check on each machine.
For example, I'm on a MBP and currently connected to another laptop (on same wireless network), another Mac (it's wired and sharing iTunes) and a Linux box (wired).
Your issue is (most likely) not due to *how* your machines are connected to your network.