Legacy networking configuration without DHCP

New to Openstack. Attempting to set up Legacy Networking on Icehouse on Ubuntu 14.04 I have a compute node with a single physical connection on eth1 to our shared lab network switch. The default configuration uses the following in the nova.conf file network_manager = nova.network.manager.FlatDHCPManager this indicates to me that an instance will use DHCP to get an IP address from our external subnet. Is there a way to configure legacy networking to not use DHCP and allow us to hard-code IP addresses on the instances from a pool of IP's on our lab subnet without using DHCP?