Network Gurus: How to create a "virtual" network adapter?

We have an older Xserve (G4) with dual ethernet ports, running OS X Server 10.4 and FileMaker Server 5.5. One of the ethernet ports is connected to an internal network (behind the firewall), the other to an external network (in front of the firewall). There are appropriate IP addresses on each port. Thing is, I need FileMaker Server to be able to serve databases on BOTH network ports and it doesn’t seem to be capable. There’s a “preferred IP address” setting which lets me select the internal or external addresses, but not both.
Is there a way to create a "virtual" network adapter that I can point FileMaker Server to, but have all traffic from both ethernet ports go through this "virtual" adapter? Sort of like a 'software router'?

IMHO, a far, far better solution would be to turn on the VPN server built-into your Mac OS X Server.
That way remote users can connect to the VPN (automatically, even) and get assigned an IP address in the internal network. You gain a high degree of security knowing that only known, trusted external users can access your database. If you do configure Filemaker to listed on your public interface you have no practical way of preventing rogue users from accessing your data.
Since your server already has the VPN server installed, and any modern (or even semi-modern) client should be able to connect to it, I wouldn't look any further.

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