Learning OpenStack Networking - Third Edition

Demonstrating traffic between instances

Imagine a scenario where virtual machines in different networks exist on two different compute nodes, as demonstrated in the following diagram:

Traffic from the blue virtual machine instance on Compute A to the red virtual machine instance on Compute B will first be forwarded from the instance to its local gateway through the integration bridge and to the router namespace, as shown here:

Source MAC	Destination MAC	Source IP	Destination IP
Blue VM	Blue router interface	Blue VM	Red VM ...