Okay, i know that i asked about this several times (sorry mr smaffulli >:< ) but now i have the situation more clear (a little), moreover i didn't find a solution on web, sigh.

I installed Openstack Icehouse with Neutron on my Ubuntu VM on my pc. Then, i started manage the cloud using Horizon dashboard, i created 2 little istances and i linked them to my public (and only) network, both of them have a floating ip:

I don't really care about security (all this is for a school project) so i'm directly using only a public (and presume, exthernal) network wich is connected to the 2 istances:

Now, what i want is connect the Project (the cloud) to a cloud management platform online, so my cloud must be reachable from internet. I presume i should use Keystone for autentication since the platform need my public url endpoint to connect to my cloud. Infact i need those (examples):

Instead, i still have the default credentials that are composed by a private ip (10.0.2.15):

So the question is: how can i manage my single network and the keystone service to admit internet to reach my cloud? (My Ubuntu VM has a single Nat network card for now).