Each project contains two types of network: private and public.
When you create a project, a private network is automatically created to help you:
default-net, with addresses in 192.168.1.0/24.
But you can create as many as you like.
VMs will be created in a private network (the “default-net”, for example).
They will have access to the outside via a SNAT mechanism, but will not be visible from the outside.
VMs can also communicate with each other within the private networks of the same project.
For each project, there is a public network: public, which is a network routed on the UGA backbone.
It’s in this public network that you can allocate floating ip addresses.
These floating ip can then be associated with the VMs you’ve created, to make them accessible.
The list of project subnets is given by the command:
openstack subnet list
which returns the subnet of the default private network, default-subnet.
Private IP networks (10.1.13*.*) cannot access the Internet without using the UGA proxy.