How to create 2nd DS instance on same box but different IP address

Hi.  I'm trying to create a second Directory Server instance on the same physical server using a Virtual IP Address.  Both instances on this server will listen on the same port so that they can be accessible using a Load Balancer.  Unfortunately, I have not been able to get this working.

I have tried two approaches.  First, I was able to create a second instance on the second IP address.  Both instances used the same DSCC agent port number .  However, whenever I tried to start or stop one DS instance, both instances would respond to the action.

Second, I then created a second Common Agent Container (cacao) that could be used by the second DS instance.  This cacao instance was mapped to the second IP address using different port numbers.  However, when I tried to create the second DS instance I received a message saying that the "The DSCC agent module is not registered on host xxx.  Verify the agent module is registered using dsccsetup status on host xxx.  If the agent module is installed register it with dsccsetup cacao-reg".