Hi Again All -
Just wanted to let everyone know that I got this setup going and it works GREAT. I have a Mac Pro with two separate Ethernet connections from two different ISPs, and clients can access databases from the internet on either network.
By doing this, I am able to keep our offsite users on their own network that is not affected by the users at the main office. Speed has been excellent and consistent for the offsite users - they use a "Portal" computer running Filemaker at the main office and access it with Remote Desktop.
I recommend trying this if you have offsite users that need remote access with intranet speed - easy to configure!