Mininet

Mininet is a free network emulator for creating virtual hosts, switches, controllers, and links on one machine. It uses the real Linux kernel and network stack, and its hosts run standard Linux networking software. Switches support OpenFlow, making Mininet useful for experimenting with software-defined networking systems using OpenFlow and P4. Researchers, developers, and learners can use it for prototyping, testing, debugging, teaching, and research. Its command-line interface understands topologies and OpenFlow, and supports debugging and network-wide tests. Users can choose parameterized topologies or create their own, and an extensible Python API supports network creation and experiments. Mininet networks can connect to real networks, and code developed in Mininet can move to real systems with minimal changes. Installation options include a packaged virtual machine, source installation, and packages for recent Ubuntu or Debian 11 and later. The VM can run through VMware or VirtualBox on Mac, Windows, and Linux, but Mininet itself depends on the Linux kernel. The project uses a permissive BSD open source license.

Mininet provides a Linux-based environment for network experimentation, with APIs and topology tools for practical development and learning. Its single-server resource limits and Linux compatibility requirements are important constraints.

Mininet suits researchers, developers, and learners who want to prototype, test, debug, or teach network behavior and SDN systems. Users need access to a Linux-kernel-based environment.

Mininet is a Linux-based network emulator for people learning networking or building and testing software-defined networks. Its real Linux networking stack and programmable topologies make it a capable single-machine lab, but it is a poor fit for workloads that need more resources than one server can provide.

Overview

Mininet creates virtual hosts, switches, controllers, and links on one machine, running standard Linux network software on the real Linux kernel and network stack. That makes it useful when an experiment needs to exercise realistic Linux networking behavior: code developed in Mininet can move to real systems with minimal changes, and an emulated network can connect to real networks.

It supports research, learning, development, prototyping, testing, and debugging. The key trade-off is that every emulated network shares one server’s CPU and bandwidth. Linux compatibility is also mandatory; non-Linux-compatible OpenFlow switches and applications are outside its reach.

Key features

Topology tools and CLI

Parameterized topologies provide starting points for common experiments, while custom topologies let users shape a network around a specific test. The topology-aware and OpenFlow-aware CLI supports debugging and network-wide tests, making Mininet useful for examining behavior before deploying code. The single-machine resource ceiling still limits how large those tests can become.

Python API and SDN

An extensible Python API allows users to create networks and experiment programmatically, which suits repeatable development and research work. OpenFlow-capable switches support custom routing and SDN experiments, and Mininet is also presented as a way to work with P4. The recommended VM includes OpenFlow binaries and tools; support for Open vSwitch and multiple OpenFlow controllers broadens its usefulness as an SDN lab.

Installation and support

Users can choose a pre-packaged VM, install from source, or use packages for recent Ubuntu and Debian 11 or later; Fedora support is experimental. Because Mininet depends on the Linux kernel, the VM is the practical route for Mac and Windows users, and it runs on VMware or VirtualBox. Documentation, an FAQ, and the mininet-discuss mailing list provide support and discussion. Since version 2.2.2, supplied VM images omit default SSH keys and generate new ones on first boot.

Pricing

Mininet is free: the Mininet plan costs nothing under a permissive BSD open source license. There is no free trial because the software itself is free. That removes a price barrier for students, researchers, and development teams, but users still need a Linux-kernel environment and a server with enough CPU and bandwidth for their experiments.

Platforms

Mininet is a Linux-dependent, self-hosted tool with an API. Native installation is available on Linux, with recent Ubuntu and Debian recommended and Fedora supported experimentally. Mac and Windows users can run the project’s VM through VMware or VirtualBox rather than running Mininet natively.

Who it's for

Mininet is best suited to learners, researchers, and developers who want to build repeatable Linux network experiments, explore OpenFlow or P4, debug topologies, or test code before moving it to real systems. It is less suitable for teams that need large-scale emulation beyond a single server’s capacity or rely on non-Linux-compatible switches and applications.

Pros and cons

• Pros: Runs standard Linux networking software on the real kernel, making experiments more relevant to Linux deployments.
• Pros: Combines a Python API, parameterized and custom topologies, and an SDN-aware CLI for programmatic experiments and network-wide tests.
• Pros: Free under a permissive BSD license, with VM and native installation options.
• Cons: Every network is limited by the CPU and bandwidth of a single server, restricting scale.
• Cons: Requires Linux-kernel compatibility, excluding non-Linux-compatible OpenFlow switches and applications.
• Cons: Fedora support is experimental, and Mac or Windows users need a virtual machine rather than a native installation.

Alternatives

Choose EVE-NG if its freemium model and stated node allowances—7 nodes per instance and 63 per lab on the free plan—fit your lab better; its listed plans are also limited to the Admin role. IMUNES is another free option if you want to compare a different open-source network tool.

NetSim by Tetcos may suit Windows users seeking an individual-use free edition or an academic plan with 100 nodes and 35+ built-in lab experiments. Consider OMNeT++ when a freemium tool with a free trial and a noncommercial academic license for teaching and research better matches the project.

Cisco Packet Tracer is a free alternative for readers willing to enroll in a course to download the latest version. EMANE is another free option. GNS3 may fit readers seeking free, open-source software. Kathará is a free open-source alternative with no paid plans or usage limits stated. Browse network simulation software or network testing software for more options.

Verdict

Choose Mininet if you need a free, programmable Linux lab for learning, research, or developing and testing SDN systems, and your experiments fit on one server. Its real kernel and flexible topology tools are compelling strengths; look elsewhere if your work needs greater scale or depends on software that cannot run in a Linux environment.