Open Stack

I have been able to get instack to run and get both under and overclouds 
to deploy, but the overcloud VMs are not accessable except if I first 
ssh in to the baremetal install and then into the instack (undercloud) VM.

I've been told that there is an option to set up some form of Network 
Isolation (like described here 
http://docs.openstack.org/developer/tripleo-docs/advanced_deployment/network_isolation.html 
)  so that the Nodes have a public network. Is there a document I've 
missed that descibes how to configure instack to create these additional 
interfaces on the baremetalbrbm_X nodes?  I was able to hack the VMs 
themselves by bringing them down, adding an interface on to them and 
bringing them back up, but that is not very automatable.