[Openstack-operators] Packet flow in Neutron

Xiaolin Zhang zhangxiaolins at gmail.com
Wed Jan 29 06:44:48 UTC 2014

Hi Miguel,

Within the same subnet, which is an Fixed IP segments, VM1 and VM2 can
exchange packets directly referenced by their Fixed IPs via tunnel between
PM1 and PM2.

If you are using Floating IP addresses to traverse packets between VMs,
then the NAT translation happens on Network Node by l3-agent.

*Best Regards,Xiaolin Zhang*

On Tue, Jan 28, 2014 at 5:09 PM, Miguel A Diaz Corchero <
miguelangel.diaz at externos.ciemat.es> wrote:

>  Hi
> Regarding this schema of Neutron [1], could you confirm which packet flow
> is the correct?
> We are considering that a virtual machine (VM1) sends packets to VM2, but
> both VMs are located in different compute nodes (PM1 and PM2). Both VMs are
> in the same virtual network.
> Which is the flow, a or b?
> a) VM1 -> PM1 -> Networking node -> PM2 -> VM2
> b) VM1 -> PM1 -> PM2 -> VM2
> Thanks
> Miguel.
> [1]
> http://docs.openstack.org/havana/install-guide/install/apt/content/section_networking-provider-router_with-provate-networks.html
> --
> *Miguel Angel Díaz Corchero*
> *System Administrator / Researcher*
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