Layer 3 (L3) capabilities in OpenStack
Once L2 connectivity is established, the virtual machines within one network can send or receive traffic between themselves. However, two virtual machines belonging to two different networks will not be able to communicate with each other automatically. This is done to provide privacy and isolation for tenant networks. In order to allow traffic from one Network to reach another network, OpenStack Networking supports an entity called a router.
The default implementation of OpenStack uses namespaces to support L3 routing capabilities. Namespaces are networking constructs in Linux that allow you to create a copy of the TCP/IP network stack all the way from the Ethernet interfaces (L2), routing tables, and so ...
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