IMUNES
IMUNES: A free, high-scale network emulation framework for Linux and FreeBSD experiments. Ranked #10 of 30 in Network Simulation Software by our editors (8.3/10); pricing: Free plan; best for high-scale Linux network emulation.
At a glance
- Editor score8.3 / 10
- PricingFree plan
- Best forHigh-scale Linux network emulation
- Free planYes
- Paid fromFree
- Real-time emulationYes
- Founded2004
- Facts checked20 Sep 2026
Where it wins
- Emulates hundreds to thousands of virtual nodes on one machine
- Supports real-time Gigabit-speed IP network emulation
- Combines GUI topology design with command-line experiments
Where it doesn't
- Deployment is limited to Linux and FreeBSD environments
- Self-hosted operation requires managing the local environment
- Scale varies by workload rather than a fixed capacity limit
Our verdict on IMUNES
IMUNES is an open-source network emulation and simulation framework for building realistic IP topologies from lightweight virtual nodes. It is aimed at network researchers, telecommunications product teams, laboratory environments, and educators who need real-time experiments or connections to physical network interfaces. The framework supports FreeBSD kernel-level network stack virtualization and Docker-based virtual nodes on Linux, while allowing unmodified UNIX applications to run within experiments.
Its strongest capability is scale combined with runtime control. IMUNES supports hundreds to thousands of virtual nodes on one physical machine, real-time IP network emulation at Gigabit speeds, and traffic manipulation for delay, bandwidth, bit errors, and duplication. Users can schedule runtime changes to link properties, attach physical network interfaces to virtual nodes, and execute or terminate experiments from command-line tools. These features suit repeatable laboratory work, hardware-in-the-loop scenarios, and experiments that need changing network conditions rather than static diagrams.
The product also offers a graphical Tcl/Tk interface for topology design and configuration, alongside command-line operation and automation support. Its focus is narrower than a hosted, multi-platform network testing service: deployment is centered on Linux and FreeBSD, with self-hosted operation and no listed paid tier structure. Choose IMUNES when free, open-source emulation, high node counts, physical interface attachment, and low-level network experimentation are priorities. Consider an alternative when you need a managed service, broader platform coverage, or a packaged deployment model.
Your product? Our editors can test IMUNES in depth and publish a review, labelled as paid · from $149/mo →
IMUNES pricing
IMUNES fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Simulation model | Emulation |
| Real-time emulation | Yes |
| Hardware-in-the-loop | Yes |
| Deployment options | Desktop |
| Documented node limit | Not verified |
| Automation API | Yes |
| Deployment | Self-hosted, Desktop |
| Platforms | Linux |
| Support | Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | imunes.net |
| Facts checked | 20 Sep 2026 |
Alternatives to IMUNES
- GNS3A free, broad multivendor lab for simulating, emulating, and connecting real networks.9.4
- Cisco Modeling LabsA Cisco-focused virtual lab with broad automation, integration, and deployment options.9.2
- EVE-NGA broad emulation platform for large, collaborative multivendor network labs.9.0
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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