Forcing a Mac with 2 connected ethernet ports to use one over the other

Question

I have a G5 Quad and a Mac Pro that are connected to a large network (including internet) on ETHERNET 1, and they are also directly connected over ETHERNET 2 (using Jumbo Frames). I need to ensure the G5 uses ETHERNET 2, and not ETHERNET 1, to connect to the Mac Pro. They must use both connections. How do I do this?
Tim

Answer 1

I've solved the problem. When connecting to the other computer, don't map the drive from the Finder sidebar. Instead, go to the Finder, hit Cmd+K, or select Go > Connect to Server..., then type the IP address of the other computer's ethernet port that you are directly connected to. Then write an Applescript to automatically mount the drive on startup.
Example Applescript:
+mount volume "afp://192.168.1.1/"+
Compile and Save the script as an Application with none of the Options checked. Place the script on the remote computer (the G5 Quad in my situation) in a suitable location like the Documents folder for your Username.
Next, on the remote computer, open System Preferences > Accounts, and select the correct account. Select the Login Items tab, and click the + to add your Applescript application to the list. After adding the Applescript, check the Hide checkbox so the script runs in the background. Close System Preferences and you're done. Reboot the computer to verify it connects, and voila!
Tim