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Hi Janki,

I am totally agree with Chen.
It seems you are new to Openstack, and therefore I would like to suggest
you that it would be better if you follow three node installation.
For that here is a reference link :
https://github.com/ChaimaGhribi/OpenStack-Icehouse-Installation/blob/master/OpenStack-Icehouse-Installation.rst

Thanks and Regards,
Girija Sharan Singh

On Thu, Feb 12, 2015 at 11:38 AM, Li, Chen <chen.li at intel.com> wrote:

>  Hi,
>
>
>
> From my understanding:
>
>
>
> 1.       Namespace is created by neutron-dhcp-agent.
>
> You can run neutron-dhcp-agent anywhere you want.
>
> It is common to run neutron-dhcp-agent on control node, but it is not a
> “MUST” demand.
>
>
>
>         I won’t say the network “is created in Compute node ”, a network
> is created in neutron, it related information stored in database.
>
>         After an instance start, it is neutron’s job to make sure the
> instance is working under a certain network.
>
>         If you don’t start any instance, nothing real would happen in
> compute node.
>
>  2.       Basically , br-ex is used for L3.
>
> If you don’t use floating IP, br-ex can be removed.
>
>
>
> 3.       Control node is not connected to VM network, dnsmasq (DHCP
> server) started by dhcp-agent connect to VM network, so VM can get IP
> address.
>
>
>
> Thanks.
>
> -chen
>
>
>
> *From:* Janki Chhatbar [mailto:jankihchhatbar at gmail.com]
> *Sent:* Thursday, February 12, 2015 1:05 PM
> *To:* openstack at lists.openstack.org
> *Subject:* [Openstack] Namespaces and network
>
>
>
> Hi ALL
>
> I have doubts.
>
> I am having a 3 node architecture with Neutron.
>
>
>
> 1. Whenever we create a network, it is created in Compute node and its
> namespace is stored in Control node. Instances will be created in compute
> node. Is my understanding correct?
>
> 2. Why do we need 2 ovs bridges br-int, br-ex. Cant we have just br-int
> and attach physical eth to it instead of attaching it to br-ex.
>
> 3. There are 3 types of networks namely, internal network which will carry
> internal data, VM network connecting VMs and external network connected to
> internet. My question is why is control node is connected to VM network.
>
>
>      Janki Chhatbar
>
> M.Tech (Embedded Systems)
>
> Nirma University
>
> (+91) 9409239106
>
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