The number of smart devices on your home network you can actually trust is often unclear. I didn't have a solid answer the day I pulled up my Pi-hole dashboard and caught a "smart" lightbulb quietly phoning home to a server I'd never approved. That's the deal with IoT gear: it buys you convenience and hands you a pile of black-box computers wired straight into your private network. After my employer disclosed a data breach back in 2023, my tolerance for traffic I couldn't account for dropped to zero, so I decided my Raspberry Pi home automation hub needed a real VPN tunnel instead of good intentions. What follows is how I got NordVPN running on a Pi 5 without choking the Zigbee mesh, what IoT security actually demands once you're past the lightbulb stage, and where the whole project nearly derailed.
Why a Raspberry Pi Home Automation Hub Needs Its Own VPN
Most people start small — a motion sensor here, a smart plug there, lights that turn on when you walk into the room. The jump that changes everything is wiring a Home Assistant instance into a Raspberry Pi 5, because now you're not managing lightbulbs, you're running a gateway with access to your cameras, your locks, and a record of when you're home. Somewhere around that point I stopped treating "hope the firewall holds" as a security plan and started treating the Pi like the sensitive piece of infrastructure it actually was.
My partner already thinks our network has too many flags planted in it — her name for the antennas, blinking cases, and extra routers scattered around the living room. A VPN layer felt like one more flag to her. For me it was closer to insurance: I wanted to reach back into my home network from anywhere without punching new holes in the router's firewall, and I wanted the Pi's 8GB of RAM going toward Zigbee events instead of babysitting a leaky connection.
A neighbor of mine has the opposite hobby. He's three custom mechanical keyboards deep this year, swapping switches every couple of months the way some people change their desktop wallpaper, and he still can't understand why I care more about a router closet than a keycap set. Fair enough. We're all collecting something.
The Antivirus-Bundled VPN That Tanked My Gigabit Line
Before I settled on anything that stuck, I tried the VPN that came bundled with a security suite I was already paying for, on the theory that one subscription doing two jobs beats two doing one each (the kind of two-for-one logic that rarely actually pans out). On a gigabit connection, that bundled client dropped my throughput by roughly 80 percent — downloads that should have taken a minute stretched into ten, and the automation dashboard started lagging behind real-world events by a second or two, which is exactly the kind of delay you notice when a motion sensor is supposed to trigger a light. I uninstalled it within a week.
That experience taught me something I should've known already: a VPN that's an afterthought feature bolted onto a bigger suite is rarely built for a low-power ARM board pushing real automation traffic. I wanted something with a proper Linux CLI, native ARM64 support, and a protocol that didn't eat the Pi alive.
Getting NordVPN's WireGuard-Based Client Running Without Choking the Scripts
NordVPN's NordLynx protocol, which runs on the WireGuard framework, ended up being the one that stuck. I'd already put it through six months of testing on my main machine — I wrote up six months with NordVPN after that round — but the Linux CLI experience on the Pi is its own animal. No UI, no upsell popups, just a command you run once and cron into staying alive. For a dev, that's close to ideal.
The first handshake was almost comically physical. I was at my desk when the tunnel came up, and I actually heard the Pi's little cooling fan spin up for a second as the CPU spiked, then settle back down once the connection stabilized. Encryption costs something, even on a board that handles it well — it's just usually invisible unless you're listening for it.
What Darby Asked About Splitting the Gateway From the Client
A reader named Darby Kuang — who works remotely for a fintech company and thinks in formal threat models the way I think in uptime logs — emailed asking whether running the automation stack and the VPN client on the same board was asking for trouble. Fair question. Once the Pi is handling encryption, Home Assistant automations, and network I/O all at once, you can see it in the response times: a light switch that should fire in 50 milliseconds creeping toward 500 under load.
His question is basically what pushed me toward a hybrid setup. The heavier IoT devices moved to a dedicated VLAN running through a VPN at the router level, and the Pi's own client now only has to cover its internal data and remote management — a question of choosing between NordVPN and Surfshark for high-speed home networks at the router, separate from whatever runs on the Pi itself. That split kept the 64-bit chip from getting bogged down whenever the network spiked.
It also meant I could stop worrying about port forwarding or a reverse proxy for remote access, since NordVPN's mesh networking feature lets me reach the Pi's local IP without opening anything on the router — I checked the dashboard from a coffee shop in Fremont one afternoon and it loaded like I was sitting on my own couch.
Seven Weeks of Logs, One Boring Proof Point
By week seven of running this setup, the clearest proof it was actually working came from a boring test: pulling a 4 GB Linux ISO through the Pi's torrent client with forwarding enabled on a single port, done in under eight minutes. I watched the router's WAN light go from its usual steady blink to a slow amber pulse the one time throughput dipped mid-test, which told me more about where the bottleneck actually was than any speed app ever has.
Seven weeks isn't long in the scheme of things, but it was enough to stop thinking about the tunnel as an experiment and start treating it as plumbing — the kind of thing you only notice when it breaks.
Where IoT Security and the Tunnel Stand Now
These days the setup my partner once called an extra flag has turned into a background process that survives a power cycle without me touching it (she's still not fully convinced). My smart devices still try to phone home — they always will — but now they do it through a path I control, separated from the rest of my personal traffic.
Securing a Raspberry Pi isn't really about which software you install; it's about deciding how much unmonitored traffic you're willing to live with. If you're coming at this after a corporate data breach of your own, the fix isn't a single product — it's taking back enough visibility that the IoT security trade-off stops feeling one-sided. That's really all this project ever was: a dev who wanted his numbers grounded and his lightbulbs on a short, accountable leash.