Open Stack

I want to use DevStack to install and configure OpenStack with Neutron, 
into a VM in an OpenStack undercloud.  I looked at 
https://wiki.openstack.org/wiki/NeutronDevstack and tried that, and 
failed.  Looking deeper, I see there are very important additional details 
to pay attention to: flat networking vs. more complex, with attention to 
address ranges all around.  Is there a short sharp description of the 
DevStack defaults in those regards?  Does anybody have a simple example 
that works, with comments about the networking in the undercloud?

I have three underclouds available.  Undercloud 9 is built on bare metal 
machines in the 10.0.0.0/8 address space, but does not in any way use 
addresses in the 10.0.0.0/15 space; this is Havana with Neutron doing 
non-flat networking.  Undercloud 15 is built on a single bare metal 
machine in the 9.0.0.0/8 address space; this is Icehouse as of a few weeks 
ago, with nova networking giving VMs static IP addresses in the 
10.0.0.0/16 space (obviously I can add networks and subnets inside this 
undercloud).  Undercloud 22 is built on a single bare metal machine in the 
9.0.0.0/8 address space; this is Grizzly with Quantum doing flat 
networking.

Thanks,
Mike
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