Mininet

Mininet is a Linux-based network emulation tool for people learning networking or building and evaluating SDN systems. Its real Linux network stack and programmable topologies make it a useful experimental lab, provided one server has enough capacity for the work.

Overview

Mininet creates virtual hosts, switches, controllers, and links on a single machine. Unlike a purely abstract network model, its hosts run standard Linux network software on the real Linux kernel and network stack. That makes it a strong fit for research, teaching, development, prototyping, testing, and debugging when Linux behavior matters.

Emulated networks can connect to real networks, and code developed in Mininet can move to real systems with minimal changes. Those advantages do not remove its hard boundaries: network size is constrained by one server’s CPU and bandwidth, and non-Linux-compatible OpenFlow switches or applications will not run.

Key features

Topology creation and testing

Parameterized topologies provide a starting point for experiments, while custom topologies allow users to model a particular network. The topology-aware and OpenFlow-aware CLI supports debugging and network-wide tests. Together, these tools suit iterative lab work, but they do not overcome the capacity limit of the host server.

Python API and SDN experiments

An extensible Python API lets users create networks and experiment programmatically, which is useful for repeatable development and research. OpenFlow-capable switches support custom routing and SDN work; Mininet is also presented for experimenting with P4. The recommended VM includes OpenFlow binaries and tools, and Mininet supports Open vSwitch and multiple OpenFlow controllers.

Installation and support

Users can choose a pre-packaged VM, install from source, or use packages for recent Ubuntu or Debian 11 and later. Fedora is supported experimentally. The VM runs on VMware or VirtualBox for Mac, Windows, and Linux, but Mininet itself depends on the Linux kernel, so those desktop platforms are ways to host the Linux environment rather than native non-Linux execution.

Support and discussion are available through the FAQ, documentation, and mininet-discuss mailing list. The software uses a permissive BSD open source license. Since Mininet 2.2.2, supplied VM images have default SSH keys removed so fresh keys are generated on first boot.

Pricing

Mininet is free: its plan costs nothing and is covered by a permissive BSD open source license. There is no free-trial distinction to weigh against a paid tier; no paid plan is described. The trade-offs are operational rather than tier-based: users need a Linux kernel, and every emulated network shares one server’s CPU and bandwidth.

Platforms

Mininet is Linux-kernel-dependent and can be installed natively from source or through packages for recent Ubuntu and Debian 11 and later. A pre-packaged VM runs on VMware or VirtualBox on Mac, Windows, and Linux, providing a route for users on those systems to work with the required Linux environment. It is self-hosted and server-oriented, with an API for automation.

Who it's for

Mininet is a good choice for students, researchers, and developers who need a low-cost Linux network lab for topology experiments, OpenFlow or P4 work, and testing code intended to move toward real systems. It is less suitable for large emulations that outgrow one server, or for projects that rely on non-Linux-compatible switches and applications.

Pros and cons

• Pros: Real Linux kernel and network software make experiments relevant to Linux deployments, and code can move to real systems with minimal changes.
• Pros: Custom and parameterized topologies, a network-aware CLI, and an extensible Python API support both interactive debugging and scripted experiments.
• Pros: The free BSD-licensed software can connect emulated networks to real networks and supports OpenFlow-based SDN work.
• Cons: One server’s CPU and bandwidth cap the size and performance of every emulation.
• Cons: Linux compatibility is mandatory; non-Linux-compatible OpenFlow switches and applications are outside its reach.

Alternatives

EVE-NG is worth considering for a freemium option with a stated 7-node-per-instance and 63-node-per-lab free allowance, or a from €150 (priced on request) Base plan. IMUNES is another free option. GNS3 is a free, open source alternative. OMNeT++ may suit noncommercial teaching and research through its free Academic Public License, while commercial use requires a separate license.

PNETLab offers a free platform with an offline version and full features, though offline mode is limited to 10 accounts. Cisco Modeling Labs provides a free tier capped at 5 running nodes, with paid Personal plans for one user and 20 or 40 Cisco nodes at custom pricing. Cisco Packet Tracer is a free alternative whose latest version requires course enrollment to download. Containerlab is another free option, intended for a Linux server or VM with Docker and sudo privileges for some operations.

Browse Network Simulation Software and Network Testing Software for more options in these categories.

Verdict

Choose Mininet for free, programmable Linux network emulation when realistic Linux behavior and the ability to carry code toward real systems matter more than scale. Look elsewhere if your lab must exceed a single server’s resources or depends on software that is not Linux-compatible.