Troublie with File Sharing and Other Activities between two Macs

Here's my situation. I have two Macs... a MacBook Pro and a Mac Pro, both running OS X 10.5.7. They connect to the Internet wirelessly through an Apple Airport Extreme (N) Base Station. But I also have them connected to each other via Ethernet. AppleTalk is turned on, only on the Ethernet connection.
My problem is that I want to curtail all computer-to-computer communications (file sharing, Airfoil speaker connections for playing iTunes, Chronosync file synchronization, etc.) so that they ONLY occur over the Ethernet connection.
I have both computers setup so that "Ethernet" is first in the sort order for network connections. File Sharing is turned on on both computers.
But... I can tell that, sometimes, the connection between the two computers is occurring over the WiFi instead of through the Ethernet (for instance, I disconnect from the WiFi on the Mac Pro and the music playing through AirFoil stops... or Chronosync can't connect to the laptop to perform a sync).
Am I just up a creek? Or is there some way to ensure that the two computers only "see" each other over the Ethernet connection and not over the shared WiFi? I know that, with "N" speeds on the Airport Extreme (and with N-capable cards in both computers), the "speed" thing isn't that big of a deal. But when running a Chronosync synchronization where several GBs of shared files are being synched, it still puts a crimp in Internet browsing speeds, etc., if that data is going over the WiFi instead of the Ethernet.
Thanks!

Hi,
I'm not certain of this but whilst you're waiting for a more informed response here goes. OSX uses something called the "default route" which prefers the one with internet access over the order of networks you set in preferences, therefore, the default route isn't necessarily the fastest route. Without editing configuration files or using hardware or software to hard code routing routines, you'll need to switch off Airport and hence the default route will become the network created automatically by your ethernet connected Macs. Apple Talk isn't necessary.
This thread may be of interest to you:
http://discussions.apple.com/thread.jspa?threadID=2039622&tstart=0

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In April I upgraded my old Core Duo MBP to a shiny new Core i7 MBP. From the get go I have had problems on and off with Apple File Sharing and Screen Sharing over my network. I have a Mac Mini hooked into my entertainment center used as a HTPC and I generally had controlled it via the laptop screen sharing over the network.
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Troublie with File Sharing and Other Activities between two Macs

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