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On 2016-05-10 09:40, Alvise Dorigo wrote:
> Hi,
> I'm reading the Mitaka installation guide. I've seen that the GRE

Which guide exactly? This one?
http://docs.openstack.org/mitaka/install-guide-obs/

That gives just one example architecture - not everything. The goal of
that guide is for training, not for actual production clouds.

For more scenarios, see the Networking Guide:
http://docs.openstack.org/mitaka/networking-guide/

> tunneling mechanism isn't mentioned anymore (it was at least until Kilo).
> What happened to GRE ? is it not usable anymore in Mitaka, or what ?
> 
> I've a Kilo production IaaS using GRE and I need to migrate it to
> Mitaka; do I have any chance to maintain GRE ?

AFAIK: Yes!

Andreas
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