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On Tue, Jan 28, 2014 at 7:49 AM, gustavo panizzo <gfa> <gfa at zumbi.com.ar>wrote:

> b
>
> you can confirm checking arp tables on both vm1 and vm2
>

yes B.

Packets only need to transit through the networking node if it is doing
routing with or without NAT for them. I believe this includes SNAT for
floating IPs, but I don't use floating IPs so not 100% sure.

I have (most of) my neutron subnets configured to use an existing external
router so none of the traffic is bottlenecked by the networking host nor is
i ta single point of failure for running instances.  Though if it goes away
so does the control plane so I can't start anything new or make any
changes, so what I have is not a true HA config.

-Jon

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> sent from mobile
>
> 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*
>> *c/ Sola nº 1; 10200 TRUJILLO, SPAIN*
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