Building IRRd and bgpq4 Docker Containers for Network Labs

Containerlab Network Emulator v0.73 Review

Recreating a Real-World BGP Hijack with the Kathará Network Emulator

Open-source network simulators and emulators in 2026

Cloonix Network Emulator Updated to Version 53

The Cloonix network emulator continues to be actively developed in 2026. In version 53, it provides container support, a rootless installation option, experimental support for WiFi emulation, and a simplified user experience.

In this post, I will review Cloonix v53 and walk through some hands-on exercises with the new features.

What’s New in Cloonix v53

The Cloonix network emulator has evolved significantly since I last wrote about it in 2017.

I list the major changes, since I last looked at Cloonix, below:

Container Support

One of the most significant additions is native container support, using crun. Cloonix feature support for containers is, however, limited. For example, one cannot save a container’s filesystem and containers do not support Spice connections so they can’t run a desktop environment.

Cloonix containers start faster and use fewer resources than KVM virtual machines, or even Docker containers, making them ideal for scenarios where you need many lightweight nodes. I imagine containers in Cloonix will be used to create many clients in a network simulation scenario.

Cloonix continues to support virtual machines using qemu-kvm, and you can mix containers and KVM VMs in the same Cloonix topology.

Rootless Installation Option

Cloonix v53 introduces a “cloonix-toy” installation Continue reading

History of SDN in Google’s datacentre

I recently read a very interesting post on LinkedIn in which Urs Hölzle, one of the original Google network engineers, celebrated twenty years of Google network innovation. He provided links to the recent paper from Google describing how Google developed its datacentre network and how it has evolved since then. The paper describes how Google applied the Clos network topology in its datacentres and the early implementations of software-defined-networking that controlled data flows across the network.

One point that was really interesting, which came up in the comments to the article, is that Google implemented the original network routing code in Python.

Mr. Hölzle also linked to an independant research report that came out at the time. It provided the initial view of what Google was developing and is interesting to read almost 20 years after it was written.

The post History of SDN in Google’s datacentre appeared first on Open-Source Routing and Network Simulation.

Open-source network simulation roundup 2024

I updated the status of the open-source network simulation and network emulation projects tracked in this blog. I found no new projects to add to my lists in 2023 or early 2024. I also did not have to delete any projects because they all seem to have an acceptable level of support in 2024.

Read the rest of this post for information about the latest open-source network simulator releases, as of the end of February, 2024.

Network Simulators

• cnet (No links; see below.)
  • The development team is re-writing the cnet code base and the old version is no longer available to download. A new version will be released soon: in, or after, March 2024. I will update the links on my web site at that time.
• ns-3
  • ns-3 continues to be a major, active project. The most recent release was ns-3.41 on February 9, 2024. The ns-3 source code is on GitLab. at
• OMNet++
  • OMNeT++ also continues to be a major project that is actively maintained. Release 6.0.3 was made available on February 24, 2024. The OMNET++ source code is on GitHub.
• Shadow
  • Shadow is actively maintained with many fixed and features added in 2023. The Continue reading

Network simulators for high-school teachers

Educators in secondary schools, who teach students aged 14 to 18, have unique needs for a network simulator. Most would require a simulator or emulator that offers a web interface so students can access it from a web browser running on a Chromebook or iPad. Ideally, the simulator should enable educators to demonstrate fundamental networking topics without requiring students to spend too much time learning to use the tool or to configure virtual network appliances in the tool.

Most of the projects listed below animate the basic functions of a communications network in a way that is easier for young students to understand. While they may not be interesting to a networking professional, these network simulators solve problems that educators may have.

Free and open-source simulators

The following set of network simulators is free and open source. The first two projects, CS4G and ENS, are available via a web browser. The last open-source project, Filius, is a standalone application that must be installed on a student’s computer.

CS4G Network Simulator

CS4G Netsim is a Web-based network simulator for teaching hacking to high-schoolers. It demonstrates some basic security issues that Internet users should be aware of.

The source code Continue reading

Twenty-five open-source network emulators and simulators you can use in 2023

I surveyed the current state of the art in open-source network emulation and simulation. I also reviewed the development and support status of all the network emulators and network simulators previously featured in my blog.

Of all the network emulators and network simulators I mentioned in my blog over the years, I found that eighteen of them are still active projects. I also found seven new projects that you can try. See below for a brief update about each tool.

Active projects

Below is a list of the tools previously featured in my blog that are, in my opinion, still actively supported.

Cloonix

Cloonix version 28 was released in January 2023. Cloonix stitches together Linux networking tools to make it easy to emulate complex networks by linking virtual machines and containers. Cloonix has both a command-line-interface and a graphical user interface.

The Cloonix web site now has a new address at: clownix.net and theCloonix project now hosts code on Github. Cloonix adopted a new release numbering scheme since I reviewed it in 2017. So it is now at “v28”.

Cloudsim

CloudSim is still maintained. Cloudsim is a network simulator that enables modeling, simulation, and experimentation of emerging Cloud computing Continue reading

Learning to use Python classes

This tutorial demonstrates object-oriented programming and Python classes.

I think that most people learn best when working on a practical project, so I will show readers how to build a simple program that they can share with their friends and family. While building the program, I demonstrate the types of problems solved by using Python classes and I use Python classes to build and manage multiple game elements.

NOTE: I realize this is off-topic for my blog. I used the Pyxel game framework as an tool to introduce Python programming to my child. After using Pyxel to build a game, I thought that it provided a good example of using Python classes in an easy-to-understand way.

I assume the reader has already learned the basics of Python programming.

Python Classes

A Python class is a type of Python object used in object-oriented programming. Programmers create new objects by instantiating, or calling, classes. They may then use or modify those instances’ attributes in their programs.

Each instance of a class is a unique object that may contain variables, called data attributes, and functions, called methods.

Each class also contains an initialization function, called a constructor, that runs when a new Continue reading

2021 IT Blog Awards finalist!

I was surprised but very honoured to learn that my blog was selected as a finalist in the IT Blog Awards. I started this blog to help with my learning during a personal research project and to contribute to the open-source networking community as best I could. I never imagined that someone else might consider it for an honour such as this!

If you have gotten value from reading this blog, please go to the IT Blog Awards voting page and vote for the “Open Source Routing and Network Simulation” blog. Thank you so much!

Use Containerlab to emulate open-source routers

Containerlab is a new open-source network emulator that quickly builds network test environments in a devops-style workflow. It provides a command-line-interface for orchestrating and managing container-based networking labs and supports containerized router images available from the major networking vendors.

More interestingly, Containerlab supports any open-source network operating system that is published as a container image, such as the Free Range Routing (FRR) router. This post will review how Containerlab works with the FRR open-source router.

While working through this example, you will learn about most of Containerlab’s container-based features. Containerlab also supports VM-based network devices so users may run commercial router disk images in network emulation scenarios. I’ll write about building and running VM-based labs in a future post.

While it was initially developed by Nokia engineers, Containerlab is intended to be a vendor-neutral network emulator and, since its first release, the project has accepted contributions from other individuals and companies.

The Containerlab project provides excellent documentation so I don’t need to write a tutorial. But, Containerlab does not yet document all the steps required to build an open-source router lab that starts in a pre-defined state. This post will cover that scenario so I hope it adds something of Continue reading

Using the Python Rich library to display status indicators

I recently added a status indicator to my azruntime application. If users have a lot of VMs in their subscriptions, the azruntime application can take a long time to run. Users will appreciate seeing the status so they know the program is still running and is not hung up.

I used the Rich library to implement a status indicator. I had to learn more about Python context managers to understand how the Rich library’s progress bar and status indicators work. The Rich library’s documentation is aimed at intermediate-to-advanced programmers and the Rich tutorials I found on the web did not cover using the Rich library’s status update features.

In this post, I will share what I learned while adding a status indicator to my program and show you how to implement the same in your projects.

Rich library overview

The Rich library makes it easy to add color and style to terminal output. Rich can also render pretty tables, progress bars, markdown, syntax highlighted source code, tracebacks, and more.¹

This post focuses only on creating a status indicator. To learn more about what Rich can do for you, I encourage you to read one of the excellent Rich overviews Continue reading

Install azruntime as a CLI program using pipx

azruntime, the Python program I wrote to manage virtual machines in my Azure subscriptions, is more convenient to use when run as a command from the Linux prompt instead of as a Python program in its virtual environment. You can install Python packages as command-line-programs using pipx.

To make azruntime work after using pipx to install it, I had to organize the project into a proper Python package folder structure, add an entry point in the setup.py file, and change the authentication class used by azruntime.

This post describes what I learned about pipx and Python packaging to enable me to install azruntime as a CLI application.

Changing the package directory structure

I originally structured the azruntime package so all its files were in one folder. I know this is not the standard way that packages are organized but I thought it was simpler and it worked with pip. However, pipx requires the correct package folder structure.

Below, I show the new folder structure I created.

azruntime/
├── LICENSE
├── README.md
├── azruntime
│   ├── __init.py__
│   ├── __main__.py
│   └── azruntime.py
├── requirements.txt
└── setup.py

At the top level, I have Continue reading

azruntime: Manage Azure Infrastructure with Python

I wrote a new Python script called azruntime. It helps me manage my Azure VMs. The script is open-source and should work for anyone who also uses the Azure CLI. azruntime is available on my azure-scripts GitHub repository.

I learned a lot about the Azure Python SDK while working on the azruntime project. In this post, I share what I learned and highlight the more interesting topics like how to find information faster in the Azure Python SDK documentation, Azure authorization, and sorting nested lists by key.

Learning the Azure Python SDK and API

Microsoft offers excellent documentation of all its Azure services, including detailed documentation for the Azure Python SDK. The problem may be that there is so much documentation it is hard to know where to start.

In my opinion, the best place to start is to look at the Azure sample scripts available at the following URL:

• https://docs.microsoft.com/en-ca/samples/browse/

Search by keyword or category. When you find a script that appears to display some of the functionality you want to implement, use a search engine to search for the Azure Python SDK classes and functions you see used in the sample scripts.

This is a faster Continue reading

Flask web app tutorial for network engineers

Most network engineers don’t need to create web sites but they may, like me, want to convert their existing Python command-line programs into web apps so others can use them more easily. This tutorial presents the minimum you need to know about Python, Flask, and the Bootstrap CSS framework to create a practical web app that looks professional.

This tutorial covers a different type of use-case than is usually demonstrated in Flask tutorials aimed at beginners. It shows you how to create a web app that “wraps up” another Python program’s functionality.

I will show you how to use the Flask framework to build a web app that re-uses code from my Usermapper program and enables users to run it on a website, instead of installing and running it locally on their PC. You will create a “usermapper-as-a-service” application, served as a responsive web app that looks good on computer screens, tablets, and mobile phones.

I wrote this tutorial while I was learning Flask and developing my usermapper-web Flask application. It was written by a beginner, for other beginners. It walks through topics in the order in which I learned them. I hope you find this approach to be readable Continue reading

A Python learning path for network engineers

Python programming is now a required skill for network engineers. I recorded videos of myself as I learned and practiced Python programming. I think these videos, along with the links to learning resources associated with each video’s topic, serve as a good learning guide for network engineers getting started with Python programming.

This post collects links to all ten videos I created. Over the course of these videos, I wrote a program called Usermapper that reads a configuration file and builds an XML authentication file for the Guacamole web proxy. I also used the Git version control system and posted the code in my Usermapper GitHub repository

Topics I need to learn

I learned some programming during my Electrical Engineering degree program many years ago. After I graduated, except for some basic scripting, I’ve not had to do any programming.

These videos do not cover the basics of Python. I strongly suggest you read a book about Python, or watch some video training (see suggestions below) before you start working through these videos. Before I started recording this first video, I read the O’Reilly book, Learning Python, and wrote a blog post about what I learned in the first Continue reading

Python: The Minimum You Need to Know

Many network engineers and other professionals are transitioning their skills set to include programming and automation. Commonly, their previous programming experience comes from a few programming courses they attended in university a long time ago. I am one of those professionals and I created this Python programming guide for people like you and me.

In this guide, I explain the absolute minimum amount you need to learn about Python in order to create useful programs. Follow this guide to get a very short, but functional, overview of Python programming in less than one hour.

I omit many topics from this text that you do not need to know when you begin using Python; you can learn them later, when you need them. I don’t want you to have to unlearn misconceptions later, when you become more experienced, so I do include some Python concepts that other beginner guides might skip, such as the Python object model. This guide is “simple” but it is also “mostly correct”.

Getting Started

In this guide, I will explore the seven fundamental topics you need to know to create useful programs almost immediately. These topics are:

• The Python object model simplified
• Defining objects
• Core types
• Continue reading

Fixing a Thinkpad T420 battery problem on Linux

I upgraded my T420 because Ubuntu Mate 19.10 now supports the Nvidia Optimus drivers and includes a utility that lets me switch between Intel and Nvidia graphics cards. However, the upgrade seemed to break the power management on my laptop. When running on the battery, the laptop would suddenly lose power after only 10 minutes, even when the battery still shows ninety percent charge.

I installed Linux Advanced Power Management, TLP. TLP solved my problem. Also, for good measure, I upgraded the BIOS because, while troubleshooting this issue, I discovered is was very out of date.

In his post, I describe how to install and configure TLP and how to upgrade the BIOS on a Lenovo Thinkpad T420.

Install TLP

The Mate Power Management utility is part of the Mate desktop environment and provides basic configurations for power management. I don’t know why installing TLP solved my battery problem. I can only suggest that, if you are seeing a similar problem with your battery, try installing TLP before you spend money on a new battery.

TLP is in the Ubuntu repositories. Install TLP using the following command:

$ sudo apt update
$ sudo apt install tlp tlp-rdw
$ sudo  Continue reading

Run the Antidote network emulator on KVM for better performance

Antidote is the network emulator that runs the labs on the Network Reliability Labs web site. You may install a standalone version of Antidote on your personal computer using the Vagrant virtual environment provisioning tool.

In this post, I show you how to run Antidote on a Linux system with KVM, instead of VirtualBox, on your local PC to achieve better performance — especially on older hardware.

Why use KVM instead of VirtualBox?

Antidote runs emulated network nodes inside a host virtual machine. If these emulated nodes must also run on a hypervisor, as most commercial router images require, then they are running as nested virtual machines inside the host virtual machine. Unless you can pass through your computer’s hardware support for virtualization to the nested virtual machines, they will run slowly.

VirtualBox offers only limited support for nested virtualization. If you are using a Linux system, you can get better performance if you use Libvirt and KVM, which provide native support for nested virtualization.

When to use VirtualBox

If you plan to run Antidote on a Mac or a PC, you should use Antidote’s standard installation with VirtualBox¹. Vagrant and VirtualBox are both cross-platform, open-source tools.

Continue reading