IoT devices are notoriously vulnerable — many ship with weak defaults, no firewall, and no way to install security software. The best defense isn't a traditional VPN but a purpose-built secure networking tool. We compare ZeroTier, Twingate, WireGuard, and PiVPN to find the right fit for your smart home or small business.
Your smart thermostat, security camera, and smart plug all share one thing in common: they're probably the least secure devices on your network. Most IoT gadgets run stripped-down Linux, rarely get firmware updates, and have no built-in firewall. A VPN — or more precisely, a secure overlay network — is the best way to isolate and protect them without needing to replace every device.
But not all VPNs are built for IoT. Traditional VPNs route all traffic through a single server, which adds latency and complexity for headless devices that can't run a client. The tools below take different approaches: software-defined networking, zero-trust gateways, lightweight tunneling, and DIY server setups. Here's what works and why.
Before we get to the picks, a quick framework. The right tool for your IoT setup depends on three things:
ZeroTier isn't really a VPN — it's a software-defined networking (SDN) platform that creates a virtual Layer 2 switch across all your devices.1 Every device on your ZeroTier network gets a private IP and can talk to any other device as if they're on the same physical switch, even if they're on different continents.
For IoT, this is huge. You can put your Raspberry Pi hub, security cameras, and sensors all on the same virtual network with centralized management through ZeroTier's web console. It supports virtually every platform, including ARM and embedded Linux, and uses very little CPU overhead once the connection is established.2
The downside: it's a flat network model, so if one IoT device is compromised, it could theoretically reach others on the same virtual LAN. You'll want to combine it with firewall rules for sensitive segments.
Twingate takes a fundamentally different approach. Instead of putting devices on a virtual network, it creates a zero-trust gateway that brokers access to specific resources — no open ports, no inbound connections, no VPN client needed on the IoT device itself.3
This is the cleanest solution for headless IoT devices that can't run a VPN client. You deploy a lightweight Twingate connector (it runs on a Raspberry Pi, a Docker container, or even a cloud VM), and then define exactly which users or services can reach which IoT endpoints. Nothing else is exposed.
The trade-off: Twingate is designed for secure remote access, not for creating a mesh network where devices talk freely among themselves. If your use case is "I need to SSH into my sensor from anywhere," Twingate is perfect. If you need devices to discover each other automatically, ZeroTier is a better fit.
WireGuard is the modern gold standard for VPN tunneling: a 4,000-line kernel module that's faster, simpler, and more auditable than OpenVPN or IPsec.1 It's built into the Linux kernel since version 5.6, which means it runs natively on most IoT Linux distributions with near-zero overhead.
For IoT, WireGuard shines when you need a straightforward site-to-site tunnel — say, connecting your home IoT VLAN to a cloud server or a remote office. It uses Curve25519 for key exchange and ChaCha20 for encryption, both of which perform well on low-power ARM CPUs.
The catch: WireGuard is a tunneling protocol, not a management platform. There's no web dashboard, no user directory, no access policies. You manage config files and public keys manually. For a handful of devices, that's fine. For 50+ IoT endpoints, you'll want something with centralized control.
PiVPN is a shell script that turns a Raspberry Pi into a fully configured WireGuard (or OpenVPN) server in about 10 minutes.4 It generates configs, sets up routing, and gives you a QR code for mobile clients. It's the simplest way to get a VPN server running at home.
For IoT, PiVPN works best as a hub: your Raspberry Pi runs the VPN server, and your IoT devices connect to it (or you route their traffic through it). It's not as elegant as ZeroTier's virtual networking or Twingate's zero-trust gateway, but it's dead simple and runs on $35 hardware.
PiVPN's limitation is that it's a traditional VPN server — all traffic goes through the Pi, which becomes a single point of failure and a bottleneck. For low-bandwidth IoT sensors, that's rarely an issue. For video streams from multiple cameras, you might notice the limit.
| Dimension | ZeroTier | Twingate | WireGuard | PiVPN |
|---|---|---|---|---|
| Architecture | Virtual SDN mesh | Zero-trust gateway | Kernel tunnel | VPN server |
| Deployment | Client per device | Headless gateway | Client per device | Server + clients |
| Management | Web console | Cloud console | Manual configs | CLI + scripts |
| IoT fit | Mesh networks | Headless devices | Site-to-site tunnels | Home hubs |
There's no single "best" VPN for IoT — it depends on how many devices you have, whether they can run a client, and how much control you need.
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