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I believe it is not possible to achieve using all layers of networking that Neutron/OpenVSwitch provide.

I haven't tested that, but it seems like the solution is to use "provider networks". So this way you cut the "virtual" network -> "virtual" router -> external network path and just assign a provider (physical) network straight to the instance.

The documentation is available here: Provider networks


Provider networks enable cloud administrators to create Networking networks that map directly to the physical networks in the data center. This is commonly used to give tenants direct access to a public network that can be used to reach the Internet.