Vending Applications on private address servers through one public address

What I would like to do is have one OSX server with a public IP  
address and a private IP address and multiple OSX servers with private  
IP addresses.  The private servers would have the instances of the  
WebObjects applications on them.  All the requests from the web would  
come to the public IP server which would more or less work as a proxy  
and would vend the instances of the applications on the private IP  
servers.  Is such a thing possible?  If so can anyone direct me to a  
resource on how to set it up.

I know that the JavaMonitor Load Balancing does something similar but  
I believe, I could be wrong, that the other servers need to have  
public IPs that have the application instances.  I also don't need  
multiple instances of the same webobjects application.

Chad Pilkington
[email protected]