Yes — you can quarantine your smart-home devices in about twenty minutes using a feature your router already has: create the guest Wi-Fi network, connect every camera, bulb, plug, speaker, and TV to it, and leave your computers and phones on the main network. The isolation works because devices on the guest network cannot initiate connections to devices on the main network — so when that $30 camera gets compromised by a botnet, the attacker's foothold stops at a segment that contains nothing but other cheap gadgets. No new hardware, no subscription, just one settings page and a patient re-enrollment of devices.
Why isolate IoT at all?
Because smart-home devices are the worst-maintained computers in the house: cheap firmware, rare updates, abandoned vendor support, and always-on network stacks. The historical record is blunt — the Mirai botnet conscripted hundreds of thousands of cameras and DVRs in 2016 using default passwords, and its successors have kept recycling the same playbook against whatever fleet is currently unpatched. A compromised gadget on your main network sits inside the firewall that matters, able to scan for your laptop, attack your router's admin page, and eavesdrop on local traffic. The same gadget on a guest segment can do none of that — it can shout at the internet and at other light bulbs, and that is the whole point.
Step 1: Create the guest network
Log in to the router's admin page (the address is on its label). Find Guest Network — sometimes under Wireless or Advanced settings. Configure it:
- A distinct name and a strong passphrase (devices will store it, so length matters more than memorability).
- If offered, enable client isolation / AP isolation — it prevents guest devices from seeing each other, adding a second wall between the camera and the TV.
- If offered, disable guest access to the local network (wording varies: "allow guests to see my devices" — off). Internet access stays on.
Some modern mesh systems (Eero, Orbi, Google Nest Wifi, TP-Link Deco) take this further: Eero Plus offers a true IoT segment, and several others let you schedule or VLAN-tag the guest SSID. Plain guest networks on conventional routers are good; a real VLAN or the mesh-specific IoT network is better where available.
Step 2: Move the devices over
For each smart device, the enrollment resets: forget the network in the device's app (or factory-reset the device if it refuses), then join it to the guest SSID through the vendor app. Do the phones-first math — the controlling phone stays on the main network, which is fine: control traffic routes through the vendor's cloud, which is exactly how these apps work anyway. The handful of devices that demand to be on the same network as the phone for casting or local control (Chromecast in some configurations, some printers) can stay on the main network — accept the exception knowingly rather than abandoning the project over it. Move the highest-risk things first: IP cameras, smart plugs, the smart TV, anything with a microphone, and anything from a brand you have never seen update itself.
Step 3: Verify the wall actually exists
Don't trust the checkbox — test it. With a laptop on the main network and (temporarily) a phone on the guest network, try to reach the laptop from the phone — ping its address or open a local service; failure is success. Then confirm the daily stuff still works: app control of lights and cameras, casting if you use it, voice assistants. If something breaks, the usual culprit is a device expecting multicast or local discovery across segments — either move that one device back or accept partial control via cloud only.
What this does and doesn't fix
The guest segment blocks the lateral movement that turns a silly gadget into a serious breach — the scenario where the camera infection becomes the laptop infection. It does nothing about the gadgets themselves being insecure (keep their firmware updated and their vendor accounts secured with MFA), nothing about the data they ship to their clouds (a privacy question we cover separately), and nothing for wired devices — a NAS or desktop plugged into the router's LAN ports sits on the main network regardless. But for the effort — twenty minutes and one passphrase re-entry session — IoT isolation is the highest-leverage home-network change available, and unlike most security habits, you set it once and never think about it again.
For more context, read Zero trust explained: never trust, always verify — and what it means in practice.
For more context, read dns filtering.
For more context, read what is a firewall.