Key Takeaways
- Smart home = surveillance home by default. Unless you take specific steps, your smart devices report your daily patterns, voice commands, viewing habits, presence schedule, and home energy usage to manufacturer cloud servers.
- Network segmentation stops lateral movement. IoT devices on the same network as your computers and phones can be exploited as entry points for attackers. A separate IoT network — easy to create on most modern routers — isolates the risk.
- DNS blocking works on devices you cannot control. You cannot install privacy software on a Samsung TV or a Ring doorbell. But you can block their telemetry endpoints at the DNS level using Pi-hole, which affects every device on your network.
- Local-first alternatives exist for everything. Zigbee bulbs work without a cloud account. Matter devices work locally. Frigate replaces Ring. Home Assistant replaces every hub. You do not have to choose between smart home and privacy.
The Data Your Smart Home Sends Right Now
Before the fixes — let’s be specific about what is happening.
Smart TVs (Samsung, LG, Roku, Amazon Fire TV): Automatic Content Recognition (ACR) technology captures a sample of your screen every few seconds and identifies what you are watching — even from HDMI-connected devices. This data is sold to advertisers and used to build detailed viewing profiles. Samsung TVs sent data to 700+ third-party domains in testing by Princeton researchers. The data includes: every show you watched, every ad you saw, how long you watched, what time, and your IP address.
Smart Doorbells and Cameras (Ring, Nest, Arlo): Ring stores footage on Amazon Web Services. Ring has provided footage to police without user consent or warrants in documented cases. Ring’s “Neighbors” app shares location-tagged footage with law enforcement. Google Nest cameras send footage and motion events to Google’s servers. Even when you think you are watching locally, many cameras route through manufacturer clouds.
Smart Speakers (Amazon Echo, Google Home, Apple HomePod): These devices listen for wake words continuously. Amazon employs human reviewers who listen to Alexa recordings. Google does the same for Google Assistant. Apple has the strongest privacy stance of the three, with on-device processing for most Siri requests — but HomePod still requires an Apple account.
Smart Thermostats (Nest, Ecobee): Your thermostat knows your presence schedule with high precision. Nest sends home/away status, temperature preferences, heating/cooling patterns, and presence detection data to Google. Ecobee shares data with utility companies and “trusted partners.”
Smart Bulbs (Philips Hue, LIFX, TP-Link Kasa): Even light bulbs send usage data. When you turn lights on and off reveals your daily schedule, sleep patterns, and presence habits. This data goes to manufacturer servers by default.
Direct Answer: How do I secure my smart home IoT devices? The most effective steps in priority order: (1) Create a separate IoT Wi-Fi network/VLAN and put all smart devices on it, isolated from computers and phones. (2) Install Pi-hole as a DNS-level ad and telemetry blocker affecting every device on your network. (3) Disable ACR (Automatic Content Recognition) on smart TVs — this is buried in settings but eliminates the most invasive tracking. (4) Replace cloud-dependent cameras with local alternatives (Frigate NVR + any RTSP camera). (5) Replace cloud-dependent hubs with Home Assistant for fully local smart home automation.
Step 1: Network Segmentation (Most Important)
Creating a separate network for IoT devices is the single highest-impact security action you can take. It accomplishes two things simultaneously:
Containment: If an IoT device is compromised by an attacker, they are on an isolated network and cannot reach your computers, phones, or NAS. The average IoT device has 25+ known vulnerabilities that manufacturers never patch.
Traffic visibility: Monitoring an isolated IoT network reveals exactly what your devices are communicating with. You will be surprised.
How to create an IoT network:
Most modern routers (ASUS, Netgear, TP-Link, Ubiquiti) support either VLANs or a separate guest network. The guest network option requires zero technical knowledge:
Router admin panel → Wireless → Guest Network
Enable guest network → Name it "IoT-Devices"
Set password → Enable "Client Isolation" (prevents IoT devices talking to each other)
Important: Do NOT enable "Access to main router network"Connect all smart devices to this IoT network. Your computers and phones stay on the main network. The router handles routing between them when needed (e.g., your phone controlling a smart bulb) but the networks are logically separated.
For advanced users (Ubiquiti UniFi or pfSense): Create proper VLANs with firewall rules that allow IoT devices to access the internet but block them from accessing your main LAN. This is more secure than a guest network.
Step 2: Block Telemetry With Pi-hole
Pi-hole is a network-wide DNS sinkhole — it intercepts DNS queries from every device on your network and blocks requests to known tracking and telemetry domains before they load.
See our complete Pi-hole setup guide: Pi-hole Setup Guide 2026: Block Every Ad on Your Home Network
Essential blocklists for smart home devices:
# Add these to Pi-hole's Adlists:
# Smart TV / ACR tracking
https://raw.githubusercontent.com/Perflyst/PiHoleBlocklist/master/SmartTV-AGH.txt
# Amazon/Ring telemetry
https://raw.githubusercontent.com/nicehash/NiceHashQuickMiner/master/deploy/nhqm-blocklist.txt
# Samsung telemetry
https://raw.githubusercontent.com/StevenBlack/hosts/master/data/StevenBlack/hosts
# IoT device telemetry (comprehensive)
https://big.oisd.nlAfter adding, update Pi-hole’s gravity (the domain database) and every device on your network benefits immediately — no configuration on the devices themselves required.
Step 3: Disable Smart TV Surveillance (Critical)
ACR (Automatic Content Recognition) is the most invasive smart TV feature. It captures your screen thousands of times per day and identifies content. It is enabled by default on every major smart TV platform.
Samsung TV — Disable ACR:
Settings → Support → Terms & Privacy → Viewing Information Services → OFF
Settings → Support → Terms & Privacy → Interest-Based Advertising → OFF
Settings → General → Privacy → Advertising → Reset Advertising IDLG TV — Disable ACR:
Settings → All Settings → General → AI Service → AI Recommendations → OFF
Settings → All Settings → Support → Additional Settings → Live Plus → OFFRoku — Disable ACR:
Settings → Privacy → Smart TV Experience → Use info from TV inputs → OFF
Settings → Privacy → Advertising → Limit Ad Tracking → ONAmazon Fire TV:
Settings → Preferences → Privacy Settings → Device Usage Data → OFF
Settings → Preferences → Privacy Settings → Collect App and Over-the-Air Usage Data → OFFApple TV: The strongest privacy stance of any smart TV platform — no ACR by default. Enable “Limit Ad Tracking” in Settings → Privacy → Advertising.
Step 4: Secure Smart Cameras
The Ring problem: Ring cameras route footage through Amazon Web Services. Ring has a documented history of sharing footage with law enforcement without user consent. Even “local storage” Ring cameras still send metadata and motion events to Amazon.
The sovereign alternative: Any RTSP-capable IP camera + Frigate NVR.
Frigate is an open-source Network Video Recorder with AI object detection that runs locally. It connects to any RTSP camera (dozens of affordable options from £25) and:
- Stores all footage locally on your NAS or home server
- Runs AI object detection on your hardware (detects people, cars, animals)
- Integrates natively with Home Assistant
- Sends zero footage to any cloud service
# Frigate configuration example (frigate.yml)
cameras:
front_door:
ffmpeg:
inputs:
- path: rtsp://username:[email protected]:554/stream
roles:
- detect
- record
detect:
enabled: true
width: 1920
height: 1080
record:
enabled: true
retain:
days: 7Run Frigate as a Docker container or as a Home Assistant add-on. Your camera footage never leaves your home.
Step 5: Replace Cloud Hubs With Home Assistant
Every major smart home hub — Samsung SmartThings, Amazon Alexa routines, Google Home — routes your automations through cloud servers. If the cloud goes down, your automations stop.
Home Assistant runs locally. Your automations run whether or not the internet works.
See our complete guide: Home Assistant Setup Guide 2026
The local-first device protocol stack:
Zigbee — The most widely supported local protocol. Philips Hue, IKEA Tradfri, Aqara, Sonoff, and hundreds of other devices use Zigbee. With a USB Zigbee coordinator and Home Assistant’s ZHA integration, all of these work completely locally — no cloud account, no hub subscription.
Matter — The new universal standard backed by Apple, Google, Amazon, and Samsung. Matter devices work locally over your Wi-Fi or Thread network. Home Assistant has native Matter support.
Z-Wave — Primarily used for security devices (door sensors, smart locks) in the US market. Fully local with a Z-Wave USB stick.
Wi-Fi devices with local firmware (Tasmota/ESPHome): Many cheap Wi-Fi smart plugs and sensors use ESP8266/ESP32 chips that can be flashed with Tasmota or ESPHome firmware, converting them from cloud-dependent to fully local.
Smart Speaker Privacy Settings
If you choose to keep smart speakers:
Amazon Echo — Minimise data collection:
Alexa App → Settings → Alexa Privacy → Manage Your Alexa Data
→ Review Voice History → Delete by date (or enable auto-deletion)
→ Help Improve Alexa → Disable "Use of Voice Recordings"
→ Interest-Based Ads → DisableGoogle Home:
Google Account → Data & Privacy → Web & App Activity
→ Turn off (this stops saving Google Assistant interactions)
Alternatively: delete activity regularly at myactivity.google.comThe honest recommendation: If privacy is a genuine priority, smart speakers are fundamentally incompatible with it. They are microphones connected to advertising companies. The privacy settings above reduce — but cannot eliminate — data collection.
The sovereign alternative: Home Assistant’s Assist with a local Ollama model gives you voice control over your home with zero data leaving your network.
Router Security: The Foundation
Your router is the gateway for all IoT traffic. These settings matter regardless of which devices you own:
1. Change default admin credentials immediately
Default: admin/admin or admin/password → Change to strong random password
2. Update firmware
Router admin → Firmware Update → Check for updates
Enable automatic updates if your router supports it
3. Disable WPS (Wi-Fi Protected Setup)
This has known security vulnerabilities → disable it
4. Use WPA3 encryption if your router supports it
(WPA2 is acceptable; WEP and WPA are not)
5. Disable UPnP (Universal Plug and Play)
UPnP allows devices to open router ports automatically — disable it
Manually configure port forwarding only for specific, intentional services
6. Change your DNS to Pi-hole or NextDNS
Router admin → DHCP → DNS Server → your Pi-hole IPThe Full Sovereign Smart Home Stack
For users who want maximum sovereignty with full smart home functionality:
| Function | Cloud Option | Sovereign Alternative |
|---|---|---|
| Hub/automation | Google Home / Alexa | Home Assistant (local) |
| Cameras | Ring / Nest | Frigate NVR + RTSP camera |
| Lighting | Philips Hue cloud | Zigbee + Home Assistant ZHA |
| Thermostat | Nest (Google) | ecobee local API / Tado local |
| DNS/ad blocking | ISP DNS | Pi-hole (local) |
| Voice control | Alexa / Google | Home Assistant Assist + Ollama |
| NVR storage | Amazon/Google cloud | Local NAS / Raspberry Pi |
Cost comparison: Ring camera subscription = £100/year. Frigate NVR = £0/year (one-time hardware cost). Philips Hue bridge subscription-free with Zigbee. The sovereign stack is typically cheaper to operate after the initial hardware investment.
FAQ
Can I secure Ring cameras without replacing them? Partially. You can disable Ring’s “Neighbors” app sharing and opt out of data-sharing programmes in Ring settings. But Ring footage will still route through Amazon Web Services — the architectural dependency cannot be eliminated while using Ring’s software.
Do Zigbee devices still work if the internet goes down? Yes. Zigbee devices communicate directly with your Zigbee coordinator over the local mesh network. Home Assistant processes automations locally. Your smart home continues working during an internet outage.
Will blocking telemetry domains break my smart devices? Occasionally. If a device genuinely needs to check a server to function (not just phone home), blocking that server will break the feature. The fix is simple: whitelist the specific domain in Pi-hole. Most telemetry blocking does not affect device functionality.
Is it legal to flash Tasmota onto a Wi-Fi smart plug? In most jurisdictions, yes — you own the device. Flashing open firmware voids the manufacturer warranty. Check your specific device and jurisdiction for edge cases.
