"To have security, plan ahead."
|--A Sicilian Proverb|
The first networking concepts in OpenStack introduced you to some easy ways to manage networking by the means of the nova-network daemon. Different network providers such as FlatManager, FlatDHCPManager, and VlanManager are used to construct the network configurations for the internal and external OpenStack networks. These network managers eventually included a bridging tool as a default gateway for instances in a compute node.
On the other hand, for management and security reasons, it might be considered limited for the following reasons:
You might have noticed the different existing networks that were deployed in a large OpenStack infrastructure and the need to isolate traffic for better...