unable to communicate to external IP if external network is configured on ethx interface

Issue

• The controller node has 3 NICs:

  • 1 (nic1) for the provisioning network ONLY (192.0.2.x - dhcp enabled to get the IP from undercloud)
  • 1 (nic2) for the external network (static IP, allocated by the undercloud, native VLAN, no dhcp)
  • 1 (nic3) for the internal openstack networks (divided into VLANs, as per the documentation, no dhcp)

• Every other node has 2 NICs:

  • 1 (nic1) for the provisioning network ONLY (192.0.2.x - dhcp enabled to get the IP from undercloud)
  • 1 (nic2) for the internal openstack networks (divided into VLANs, as per the documentation, no dhcp)

• Problem: Creating a brand new overcloud results in the default route being set to the 192.0.2.x network on the controller node, as opposed to the external network.