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Multiple public ips with Quantum



I am trying to implement a scenario where a group of instances have
multiple public ips each on the same network. Reasons for this are legacy
related, other tenants should operate like with regular floating ips. I've
tried to create multiple vifs on an instance with the same network, but it
seems like nova doesn't like that. A provider network seems the way to go
for the single tenant that has the special machines but we don't want to
give direct access to the other tenants.

The problem comes up when we need to add subnets to the two networks (flat
vm network for normal tenants, and provider) the ip spaces overlap. The
allocation pools will not overlap though but the subnets are rejected for
overlap. Is there a way to get these subnets to work or some other
solution to the above scenario?

Trevor Adams