Your smart fridge, camera, and light bulbs can't run antivirus or a VPN app. The only way to secure them is at the network level. We break down the four best approaches: ZeroTier for mesh management, WireGuard for raw speed, PiVPN for DIY control, and OpenVPN for legacy compatibility.
Your smart fridge knows when you're out of milk. Your security camera watches your front door. Your light bulbs talk to your phone. And none of them can run a single security app.
IoT devices — thermostats, plugs, cameras, speakers — are essentially single-purpose computers with minimal processing power and no user interface for installing software. They're also notoriously insecure. A compromised smart bulb can become a backdoor into your entire home network.1
The fix isn't installing antivirus on each gadget (you can't). It's wrapping your whole home network in a VPN at the router level.
Most people think of VPNs as apps you install on a phone or laptop. That's a device-level VPN — it only protects that one device. Your smart TV, thermostat, and baby monitor remain exposed.1
A router-level VPN encrypts every packet leaving your home network, regardless of which device sent it. For IoT "appliances" that can't run their own VPN client, this is the only practical defense. It also means you set it once and every new device is automatically protected.1
The tradeoff? Router-level VPNs put more load on your router's processor, so you need capable hardware and a protocol that won't bottleneck your connection.
We've selected four tools that cover the full spectrum of home IoT protection — from plug-and-play mesh networks to DIY server builds.
ZeroTier isn't a traditional VPN. It's a software-defined networking layer that makes devices on different physical networks behave as if they're on the same local LAN.2 For IoT setups where you need to reach a camera at your cabin from your phone at home, this is the most elegant solution.
It handles NAT traversal automatically, requires no port forwarding, and gives you a web dashboard to manage which devices can talk to each other. The free tier supports up to 25 nodes — enough for most smart homes.2
WireGuard is the modern gold standard for VPN protocols. Its codebase is roughly 4,000 lines (compared to OpenVPN's 400,000+), which means fewer attack surfaces and dramatically better performance. It uses modern cryptography (Curve25519, ChaCha20, BLAKE2s) and can saturate gigabit connections on modest hardware.
For router-level IoT protection, WireGuard's low overhead means your smart home traffic doesn't introduce noticeable latency. Many modern router firmwares (OpenWrt, OPNsense, pfSense) now include native WireGuard support.
PiVPN is a shell script that turns a Raspberry Pi into a fully functional VPN server in under a minute. It supports both WireGuard and OpenVPN as backends, giving you a choice between speed and compatibility.3
This is the most cost-effective approach if you already have a Pi lying around. You get full control over your VPN server, no subscription fees, and the satisfaction of knowing exactly where your traffic is routed. PiVPN's installer handles certificate generation, firewall rules, and client configuration automatically.3
OpenVPN is the veteran of the VPN protocol world. It's supported by virtually every router firmware and VPN client in existence. If you're running older router hardware that doesn't support WireGuard, OpenVPN is your reliable fallback.
It's slower than WireGuard and more complex to configure, but its maturity means it's been audited extensively. For protecting IoT devices on a router that only speaks OpenVPN, it gets the job done.
| Dimension | ZeroTier | WireGuard | PiVPN | OpenVPN |
|---|---|---|---|---|
| Encryption | AES-256-GCM | ChaCha20-Poly1305 | ChaCha20 or AES-256 | AES-256-CBC |
| NAT Traversal | Built-in | Requires helper | Requires port fwd | Requires port fwd |
| Setup Time | Minutes | Moderate | ~1 minute | Moderate to complex |
Your choice depends on your IoT setup and technical comfort:
Some of the links in this article are affiliate links. If you purchase through them, we may earn a small commission at no extra cost to you. We only recommend tools we've evaluated and stand behind.
This page was written by the engine and the engine is still on the line. The conversation below picks up where the article stops.
Yes — the picks above are the engine's current verdicts. Ask a sharper version of this question below and you'll get a custom answer with the latest pricing.