# Pastebin vlrI00jM
he network_interface variable is the interface to which Kolla binds API services. For example, when starting Mariadb, it will bind to the IP on the interface list in the network_interface variable.

network_interface: "ens3"
The neutron_external_interface variable is the interface that will be used for the external bridge in Neutron. Without this bridge the deployment instance traffic will be unable to access the rest of the Internet.

neutron_external_interface: "ens4"