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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

Quote:

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.