Book Image

Learning OpenStack Networking (Neutron)

By : James Denton
Book Image

Learning OpenStack Networking (Neutron)

By: James Denton

Overview of this book

OpenStack Neutron is an OpenStack component that provides networking as a service for other OpenStack services to architect networks and create virtual machines through its API. This API lets you define network connectivity in order to leverage network capabilities to cloud deployments. Through this practical book, you will build a strong foundational knowledge of Neutron, and will architect and build an OpenStack cloud using advanced networking features. We start with an introduction to OpenStack Neutron and its various components, including virtual switching, routing, FWaaS, VPNaaS, and LBaaS. You’ll also get hands-on by installing OpenStack and Neutron and its components, and use agents and plugins to orchestrate network connectivity and build a virtual switching infrastructure. Moving on, you’ll get to grips with the HA routing capabilities utilizing VRRP and distributed virtual routers in Neutron. You’ll also discover load balancing fundamentals, including the difference between nodes, pools, pool members, and virtual IPs. You’ll discover the purpose of security groups and learn how to apply the security concept to your cloud/tenant/instance. Finally, you' ll configure virtual private networks that will allow you to avoid the use of SNAT and floating IPs when connecting to remote networks.
Table of Contents (21 chapters)
Learning OpenStack Networking (Neutron) Second Edition
About the Author
About the Reviewers

Network address translation

Network address translation, or NAT, is a networking concept that was developed in the early 1990s in response to the rapid depletion of IP addresses throughout the world. Prior to NAT, every host connected to the Internet had a unique IP address.

Legacy routers support two types of NAT:

  • One-to-one NAT

  • Many-to-one NAT

One-to-one NAT is a method in which one IP address is directly mapped to another. Commonly referred to as static NAT, one-to-one NAT is often used to map a unique public address to a privately addressed host. Floating IPs utilize one-to-one NAT concepts.

Many-to-one NAT is a method in which multiple addresses are mapped to a single address. Many-to-one NAT employs the use of port address translation, or PAT. Neutron uses PAT to provide external access to instances behind the router when floating IPs are not assigned.

For more information on network address translation, please visit Wikipedia at