IBook disappears from network when using Airport

Hi there. Until recently my wife and her iBook have happily shared files back and forth with my Mini, and she has been able to use my shared printer. Now, when she's connected to the internet through our Airport Graphite, our computers no longer show up on each other's network, and she can't find my shared printer.
I'm not sure if I have a software or hardware problem, but I can't figure it out on my own.
We have two desktops (a Mini and an eMac) connected to a cable modem through an ethernet hub. The Airport Graphite is also connected to the hub. The Airport is configured to distribute IP addresses, and ethernet client computers also share a single IP address (using NAT).
If we unplug the ethernet cable from our eMac and plug it into my wife's iBook, the iBook and Mini can once again "see" each other, and my wife can access my shared printer. When we unplug the ethernet from the iBook and go back to using the Airport, the iBook can still access the Internet, but it disappears from the local network.
I'm hoping there's a simple explanation that I'm missing. I'd be grateful for some help!
Mac Mini 1.2 GHz Mac OS X (10.4.8)

Thanks so much for responding, Tesserax.
My hub is a "Linksys 5-Port Workgroup Hub," model EW5HUB.
The cable modem is plugged into the port called "Uplink." The Mini is plugged into port 1, the eMac into port 2, and the Airport into port 3.
The network has functioned properly in the past (the iBook used the printer plugged into the Mini, and we shared files back and forth). Recently, I had to reset the Airport, but I thought I had reconfigured it correctly. In short, Airport configuration would be my main suspect here.
I'm afraid I don't know what (if anything) is supplying NAT service. I assumed it was something the Airport does -- allowing it to sort out the flow of data to the various computers. The question is beyond my expertise level because I don't really understand what NAT service is. Is the problem in my Airport's Network configuration?
My ISP assigns IP addresses dynamically, so my Airport doesn't have a static IP address. However, my ISP allows for only two IP addresses, so I need my ethernet computers to also share the Airport's address.
I hope that, somewhere during my ramblings, a light has gone off in your more enlightened mind. Thanks again for your help!

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