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I've wondered exactly the same question -- or, put another way, why have
the concept of a "subnet" at all; why not just have one or more network
objects that have either a CIDR or set of IP ranges set on them, along with
certain flags like "shared". The way the API is right now seems needlessly
complex.

IMO, a tenant should be able to create a router for their networking,
create one or more networks for their private addresses, configure the
router's gateway to speak with the shared "public" network, and be done
with it. The sheer number of steps that is currently necessary to make in
order to set up a simple private network for a tenant's VMs is cumbersome
and smells of "implementation leaking into the API".

-jay


On Thu, Oct 10, 2013 at 10:10 AM, Marco Fornaro <Marco.Fornaro at huawei.com>wrote:

>  Hi All,****
>
> ** **
>
> Some Tricky questions I ask help for (email 1 of 3):****
>
> ** **
>
> ** **
>
> *Quantum Network object*
>
> In the “openstack networking guide”->”Using Openstack compute with
> Openstack”->” Advanced VM creation” (
> http://docs.openstack.org/grizzly/openstack-network/admin/content/advanceed_vm_creation.html)
> there are example boot a VM on one or more NETWORKs (meaning the quantum
> Network object):  ****
>
> nova boot --image <img> --flavor <flavor> \****
>
> *--nic net-id=<net1-id> --nic net-id=<net2-id>* <vm-name>****
>
> ** **
>
> BUT if you look at the description of the network object in the API
> abstraction it looks like a collection of subnets (meaning the quantum
> object), so basically a collection of IP Addresses like 192.168.100.0/24**
> **
>
> ** **
>
> *SO (first question): what happens in the network where I boot the VM has
> more than a subnet?...I suppose the VM should have a nic for EACH subnet of
> the network!*
>
> ** **
>
> *THEN (second question): why do I need a network object? Shouldn’t it be
> more practical to have just the subnet object?..why do I need to create a
> Network if it’s just a collection of subnets?*
>
> ** **
>
> Thanks in advance for any help****
>
> ** **
>
> Best Regards****
>
> ** **
>
> Marco****
>
> ** **
>
> ** **
>
> ** **
>
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