>> Yes, this works. The problem is ensuring the network isolation. That
>> is, someone can make changes in the routing table on the host which
>> will enable one to gain access to the quantum networks. That is why we
>> suggest that they run on different hosts. We have a review that is

>Damn, makes sense. Once you explain this, the reasons are clear.

Depending on the setup you could might be able to create policy based routing 
rules on the quantum l3-node to prevent this.
(e.g. traffic originating from the subnets "within quantum" are always routed 
to router x on the outside world)

Another small issue I can think of is that you might get a-symetrical routing. 
(traffic returning from the DHCP ip instead of the L3 ip)
Not sure if you can fix that with Policy Based Routing, never tried.

Cheers,
Robert van Leeuwen
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