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> Alternatively, you could drop the 'external' attribute and attach your
> instances directly to the provider network (no routers or private networks).

I can't. Because in my network design I do not have all the compute
nodes on a common L2 segment.
I have a l3 fabric between the compute nodes. So I cant just bridge
the provider network to the physical interface of any compute node.

I need the traffic to get to the network node, and there I can access
the provider network.

For a complete L2 setup I am investigating the L2-gw plugin

Saverio