WiFi Connections thru another Mac

I apologize in advance if this is a very simplistic question. I have a 6 node home network, all wired with CAT5 for 4 mac's and 2 windows PCs. I discovered recently that my Mac Mini has a wifi antenna built in and I can now have some of my laptops connect to the network thru wifi, and I do this as well with my iphone 3G. No worries.
But consider my network topology for a second. Everything is wired, except that wifi is made possible with my Mac Mini, which is also wired to my network but has its own wifi service for other devices. So here's the question. When I try to sync iphone apps with my MacPro thru wifi, they don't see each other (I'm talking specifically about two iphone apps that sync to Mac apps, 1Password and MacFamilyTree). Is this because the wifi is only connected to the Mac Mini, and doesn't let wifi connected devices see my Mac Pro? Do I have a network config problem or am I thinking about this wrong?
Any advise is really appreciated!
Thanks
Jmac

apple2be,
I too have a wired network in my home. Usually, I leave the Airport off, but curiosity got the better of me and I had to try to recreate your situation. My network lives in the 10.1.1.x IP range. I enabled Airport on one of my machines and set it to share the internet connection from ethernet to Airport (mimicking your Mac Mini). I then enabled Airport on a second machine (representing the iPhone) and connected to the Airport network created by the first machine. I looked at the IP address of the Airport connection on the second machine and found it to be in the 10.1.2.x range. As I suspected, the Mac Mini is acting as a router/wireless access point and is performing NAT between the 10.1.1.x and 10.1.2.x networks. Your iPhone can probably see your MacPro, but your MacPro cannot likely see your iPhone in much the same way that a computer from the internet (hopefully) cannot see past your router (firewall) into your home network.
You may want to try using your MacPro as the wireless access point instead of the Mac Mini. The iPhone may be able to sync to the Pro in this situation, however, I fear you'll run in to much the same problem.
Good luck and please let us know how this works out for you. I'm very interested for curiosity's sake...

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