Directing traffic to second ethernet port

Hello,
What is the process used to direct certain IP addresses or a range of IP addresses to the second ethernet connection on a Mac Pro? I have a set of Mac Pros that use the first connection for internet access and corporate server connections using Samba. But the second ethernet connection is used for a lan between the Mac Pros and printers. It currently works but it take a bit for the "connect to servers" dialog to connect to a Mac Pro on the lan because I think it is searching Connection 1 first which has hundreds of Windows servers attached to it. And it takes several minutes to connect if our service has an interruption on Connection 1. All of the Mac Pros and printers are set up to use a manual IP address (192.168...) The Mac Pro workstations use Snow Leopard and we have a Mac Pro Server running Lion Server that we use to conntrol a network RAID. Thanks for your help.

Thanks guys.
First, it seems to me that the service order is already set up correctly. I have Connection 1 on top and that's what we use for internet connection. If I change Connection 2 on top our internet connection is disabled. Also as Grant suggested we do have it set up to use different IPs and subnets. Connection 1 uses DCHP and has a static IP of 172.x.x.x and a subnet ending in 128. Connection 2 is set up manually with an IP address of 192.x.x.x and a subnet ending in 0.
I would just like to tell each Mac Pro when it trys to connect to a server with an IP of 192.x.x.x to use Connection 2 instead of trying to find it first on Connection 1. The AppleScript within an Automator program that we use to connect to servers is:
tell application "Finder"
                    open location "afp://[username]:[password]@192.x.x.x:548"
          end tell
Make sense? It has been suggested to me that I set up persistent routes, but I haven't found a solution online that matches our senario enough to implement it. Any ideas? Thanks again.

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