The Mininet alternative
for when Linux hosts are not enough.
Mininet is superb at what it was built for: thousands of hosts and switches out of Linux namespaces, in seconds, for SDN and OpenFlow research. What it cannot do is give you a Cisco prompt. If your lab needs real vendor firmware, a canvas and a console, that is a different tool.
Mininet is not a weaker emulator. It is a different thing entirely. Mininet does not emulate hardware at all. It carves up one Linux kernel into network namespaces, connects them with veth pairs, and runs ordinary Linux processes inside. That is why it can stand up a thousand-node topology on a laptop in under a minute, and it is also why every host in that topology is Linux. There is no IOS, no Junos, no EOS - and no way to add one, because there is no virtual machine to boot firmware into. It also has no notion of virtual time, so on large topologies the emulation slows down against the wall clock and your measurements drift. For OpenFlow controller research that is all fine. For practising a BGP config you will type at work, it is the wrong instrument.
Brilliant for SDN research.
Not built for vendor labs.
Every node is Linux, and that is architectural
Namespaces share the host kernel, so a node is a Linux process tree - not a virtual machine. You can run FRRouting or Open vSwitch inside one, but you cannot boot a Cisco or Juniper image into it. If your goal is CLI muscle memory on real firmware, Mininet cannot get you there at any effort level.
The topology is a Python script, and only a Python script
Topologies are built in code or through Mininet's own CLI. That is powerful and completely reproducible, and it also means there is no diagram, nothing to hand a colleague who does not read Python, and no way to see what you built without drawing it yourself.
Fidelity fades as the topology grows
Mininet has no virtual clock. Everything shares the real one, so as the topology gets big enough to saturate the host, emulated time slips behind wall-clock time and your latency and throughput numbers stop meaning what you think they mean. Mininet's own documentation is upfront about this.
One host, one kernel
A Mininet topology lives inside a single Linux machine. There is no clustering across hosts, no shared server a team logs into, and no multi-user model - if a colleague needs your lab, they need your script and their own box.
Mininet and netplex.,
line by line.
| Feature | Mininet namespaces |
netplex. Associate, free |
|---|---|---|
| How a node runs | Linux network namespace | QEMU virtual machine, container, LXC or namespace |
| Real Cisco, Juniper or Arista CLI | No | Yes - your own images |
| Topology size on a laptop | Thousands of nodes | Tens to hundreds, depending on node type |
| Time to build a big topology | Seconds | Seconds for containers, minutes for VMs |
| Visual canvas | No - Python or its own CLI | Yes - drag, wire and watch it run |
| OpenFlow and SDN controllers | Its whole purpose | Yes - Open vSwitch fabric, bring your controller |
| Timing fidelity at scale | Drifts - no virtual clock | Real VMs, real timers per node |
| Link impairment | Yes - tc based | Yes - delay, jitter, loss and rate per link |
| Multi-user, shared lab | No | Yes - send a link |
| Console in a browser | No - terminal on the host | Yes |
| Packet capture | tcpdump inside a namespace | Click a link, capture, open in Wireshark |
| Reproducible from code | Yes - Python API | Yes - REST, CLI, Terraform, Ansible, .npx in git |
| Runs across several hosts | No - one kernel | Yes on Architect - clustered hosts |
The timing point is Mininet's own documented limitation, not a benchmark we ran. Node counts depend enormously on what a node is: a container costs a fraction of what a vendor virtual machine costs.
The short version: pick by what a node needs to be.
If your nodes are Linux hosts and OpenFlow switches and you want a thousand of them, use Mininet - nothing in this space beats it on that. If any node in your topology has to be a real router running the vendor's own firmware, no amount of namespace work gets you there, and that is where netplex. starts. Containerlab sits between the two if you want containers with vendor network operating systems.
Straight with you - where Mininet still wins
Mininet is faster and lighter than anything here, by a wide margin - namespaces cost almost nothing, so a topology that would flatten a netplex. host boots on a laptop in seconds. It is the standard tool in SDN and OpenFlow research for good reasons: a mature Python API, reproducible experiments, and a decade of published papers whose methods you can copy exactly. Its tc-based link shaping is well understood and well documented. If you are writing a controller, evaluating a routing algorithm at scale, or reproducing an academic result, Mininet is the correct tool and netplex. is not a replacement for it. The line is simple: Mininet for research on Linux networking, netplex. for labs on real network devices.
Real devices, still fully scriptable.
Vendor firmware, a canvas anyone can read, and an API when you want the script back.
Actual vendor firmware
Boot your own Cisco, Juniper, Arista or Fortinet image under QEMU with the right hardware profile applied.
Mix node types freely
A QEMU router, a Docker host, an LXC container and a namespace can all sit on the same link.
A diagram, not just a script
Drag nodes, wire links, see state live. Then export the whole thing as plain JSON for git.
Open vSwitch underneath
The fabric is real OVS, so your OpenFlow controller and your SDN work still have somewhere to point.
Per-link impairment
Add delay, jitter, loss or a rate limit to any link and watch protocols react.
Automation that is not an afterthought
Versioned REST API, CLI, Terraform provider and Ansible modules for building labs from code.
Mininet questions,
answered honestly.
Weighing up another tool? Read the side-by-side.
vs Containerlab
YAML in a terminal versus a canvas - and why you don't have to choose, because netplex. imports the YAML.
vs GNS3
The desktop GUI plus a separate VM, versus one browser tab that anyone on your network can open.
vs EVE-NG
The 7-node Freemium cap, the fixpermissions ritual, the MAC-locked Pro licence - and what changes without them.
EVE-NG vs GNS3
The head-to-head everyone searches for, with a third column so you can see what both of them cost you.
vs Cisco CML
Cisco's own images and per-seat licence, next to a multi-vendor platform with a free tier.
vs Cisco Packet Tracer
Simulated device behaviour versus real IOS, and the exact point where the simulation stops keeping up.
When a node has to be
a real router.
Real vendor firmware, an Open vSwitch fabric underneath, a canvas on top and an API around it. Free tier, no node limit.
Last reviewed September 2026 · Spotted something out of date? Tell us.