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I was also thinking that B was the correct answer ... thank you all for 
confirmation !!

Miguel.


El 29/01/14 07:44, Xiaolin Zhang escribió:
> 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 
> <mailto: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*/
>     /c/ Sola nº 1; 10200 TRUJILLO, SPAIN/
>     /Tel: +34 927 65 93 17 Fax: +34 927 32 32 37
>     <tel:%2B34%20927%2032%2032%2037>/
>
>     CETA-Ciemat logo <http://www.ceta-ciemat.es/>
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