Wi-Fi and smart home guide · Updated October 23, 2026

How to Set Up an IoT or Guest Network for Smart Home Devices

Smart plugs, bulbs and cameras often have trouble on modern Wi-Fi: they only use 2.4 GHz, they drop off when a mesh system moves them between units, and some come from makers with patchy security updates. A separate IoT or guest network can help with both setup and security, but done the wrong way it also stops Matter, HomeKit and Google Home from finding your devices. This guide explains which option to use, based on TP-Link, eero, Google and Apple documentation.

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Quick answer

Setup keeps failing on a mesh system: turn on a 2.4 GHz IoT network (TP-Link calls it IoT Network) and connect the phone and the device to it during setup.
A device you only use through its cloud app: put it on a guest network or isolate it, so it cannot reach your computers and phones.
Matter, HomeKit, Google Home and casting devices: keep them on the main network, or on an IoT network that can talk to the main one, with isolation turned off.
Visitors: give them the guest network with its own name and password.

IoT network vs guest network vs device isolation

Option	What it does	Good for	Watch out for
IoT network (TP-Link Deco and Archer)	A separate Wi-Fi name and password, usually 2.4 GHz. TP-Link says the Deco IoT Network allows cross-network communication by default.	2.4 GHz-only devices that fail setup or drop off a mesh system.	It is not isolation on its own; turn on Device Isolation for devices you want walled off.
Guest network (eero, Nest Wifi and most routers)	A separate network for visitors. eero’s guest network uses a separate LAN and keeps guest devices from reaching each other.	Visitors, and smart devices you only control through the cloud.	Local control, Matter, HomeKit and casting usually fail across it.
Device Isolation (TP-Link)	Blocks chosen devices from your home network while keeping internet access.	A single camera or plug you do not fully trust.	The device cannot reach local hubs or apps on your network.

Set up an IoT network on TP-Link Deco

From TP-Link’s Deco smart home setup guide, updated July 2, 2026:

Open the Deco app and go to More > IoT Network.
Turn on the IoT Network and give it its own Wi-Fi name and password.
Tap Security and choose a Wi-Fi security protocol. Avoid None, which removes the password.
Connect your phone to the IoT network while you set up each device, then connect the device to it.

TP-Link adds three related settings. If you have more than about 20 smart devices alongside heavy users like gaming PCs or 4K TVs, High Capacity Mode (More > Advanced > Wireless Network Mode) is available on Wi-Fi 7 and select Wi-Fi 6E Deco models. If a device cannot connect at all, turn off Fast Roaming; if it drops often, turn off Beamforming (both under More > Advanced). And if Apple Home or Google Home cannot discover devices on the IoT network, make sure Device Isolation is off for those devices.

Set up an IoT network on a TP-Link Archer router

From TP-Link’s router IoT Network guide:

Go to tplinkwifi.net and sign in, then open Advanced > Wireless > IoT Network. In the Tether app, use More > IoT Network.
Enable the 2.4 GHz IoT network (only use 5 GHz if your devices support it).
Set the network name, security type and password, and save.

Isolate devices you do not trust

TP-Link’s Device Isolation guide explains that in the Deco app you go to Security > Device Isolation, tap Isolate Devices and add the devices. Isolated devices keep internet access and can still talk to each other, but cannot reach the rest of your home network. On TP-Link routers the same feature is in the Tether app or on tplinkwifi.net under Advanced > Security > Device Isolation. TP-Link notes a firmware update may be needed, and every Deco unit in the network must support it.

Use the eero guest network

eero’s guest network article explains the setup: open the eero app, enable the guest network, then set its name and password. The guest name must differ from your main network name, and eero recommends a different password too. eero’s guest network uses a separate LAN isolated from the main network, and guest devices are also isolated from each other. In its unusual network activity article, eero suggests that devices that do not need access to other devices on the network can go on the guest network to restrict their local access.

Google Nest Wifi guest network

Google’s Nest Wifi guest network help page describes a separate guest Wi-Fi where you can choose shared devices, such as a streaming device, smart TV or speaker, that guests can still use.

What breaks Matter, HomeKit and Google Home

AP or client isolation. Google’s AP isolation help page says isolation, also called guest mode, prevents setup of Chromecast and Nest speakers and displays, and you cannot set one up through a guest, hotel or public network with isolation. Check extenders too.
Hub on a different network. Apple’s Matter accessories help page says the home hub must be connected to your home Wi-Fi network. Keep the hub, your phone and Matter devices where they can reach each other.
Band mismatch during setup. Join the phone to the same 2.4 GHz network the device will use.

A practical split: main network for phones, computers, hubs and Matter or HomeKit devices; IoT network for 2.4 GHz devices that need local control; guest network or isolation for cloud-only gadgets and visitors.

Basic security for every smart device

Change default passwords and use a unique password for each device’s account.
Keep router and device firmware updated; eero lists updating firmware among its steps for unusual network activity.
Set a password on every network, including the IoT and guest networks; TP-Link warns that choosing None removes the password.
Remove devices you no longer use from your network and apps.

Gear worth considering

These routers and mesh systems were in stock as new items sold by Amazon.com when we checked on October 23, 2026. We have not tested them; the notes come from the product listings and the makers’ support pages. TP-Link lists each TP-Link model below on its IoT Network help pages, and eero’s guest network is available in the eero app.

Mesh with a dedicated IoT network: TP-Link Deco X55 (3-pack)

A dual-band Wi-Fi 6 mesh system. TP-Link’s Deco smart home guide lists the Deco X55 among the models with the IoT Network option, and its Device Isolation guide includes the X55 too, so you can run a separate 2.4 GHz network for smart devices and isolate individual devices you do not trust.

View the TP-Link Deco X55 (3-pack) on Amazon (affiliate link) →