For the firewall function demonstration, we will use the existing ryu/app/rest_firewall.py application and combine the knowledge we gained in this chapter about the REST API and flow modification. This is a simplified version of the Ryu book firewall example, https://osrg.github.io/ryu-book/en/html/rest_firewall.html. Besides firewall operations, the Ryu firewall example in the link provided illustrates the usage of multi-tenancy with VLAN. The example covered in this section will focus on the correlation between the firewall application and OpenFlow for learning purposes. This section and the linked example would be good complements of each other.
If you take a look at the rest_firewall.py code, you will notice a lot of similarities with ofctl_rest.py. In fact, most of the rest_* applications have similar functions when it comes to callback functions and...
Mastering Python Networking
Mastering Python Networking
Overview of this book
This book begins with a review of the TCP/ IP protocol suite and a refresher of the core elements of the Python language. Next, you will start using Python and supported libraries to automate network tasks from the current major network vendors. We will look at automating traditional network devices based on the command-line interface, as well as newer devices with API support, with hands-on labs. We will then learn the concepts and practical use cases of the Ansible framework in order to achieve your network goals.
We will then move on to using Python for DevOps, starting with using open source tools to test, secure, and analyze your network. Then, we will focus on network monitoring and visualization. We will learn how to retrieve network information using a polling mechanism, ?ow-based monitoring, and visualizing the data programmatically. Next, we will learn how to use the Python framework to build your own customized network web services.
In the last module, you will use Python for SDN, where you will use a Python-based controller with OpenFlow in a hands-on lab to learn its concepts and applications. We will compare and contrast OpenFlow, OpenStack, OpenDaylight, and NFV. Finally, you will use everything you’ve learned in the book to construct a migration plan to go from a legacy to a scalable SDN-based network.
Table of Contents (14 chapters)
Preface
Free Chapter
Review of TCP/IP Protocol Suite and Python Language
Low-Level Network Device Interactions
API and Intent-Driven Networking
The Python Automation Framework - Ansible Basics
The Python Automation Framework - Ansible Advance Topics
Network Security with Python
Network Monitoring with Python - Part 1
Network Monitoring with Python - Part 2
Building Network Web Services with Python
OpenFlow Basics
Advanced OpenFlow Topics
OpenStack, OpenDaylight, and NFV
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