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Can I allocate different networks to different instances?

I have two networks connected to my OpenStack Icehouse on Ubuntu 14.04 LTS. New instances receive an address from each connected network. Can I configure so that a new instance will receive only one IP address thus allowing me create twice the quantity of instances?

E.g.

network 1: 172.16.100.0/24 network 2: 172.16.101.0/24

I'd like instances to have an interface from either but not both these networks. This will allow me create 508 VMs instead of 254, which is what it seems I currently have.