I turned an old dual-band Wi-Fi router into a dedicated IoT access point, and my main network is finally clean

Published Oct 4, 2026, 8:00 AM EDT Jasmine is Software and PC Hardware Author at XDA with years of tech reporting experience ranging from AI chatbots right down to gaming hardware, she's covered just about everything. Whether it's breaking news about the latest AMD NPUs or creating video tutorials on social media platforms, Jasmine has contributed to the world of AI and tech in a variety of ways including interviewing the CEO of Razer, AMD's Director of Product Marketing and the VP of Lenovo. Passionate about gaming and PC technology, she has built countless computers, keyboards and other peripherals - knowing them inside and out. With a modern Wi-Fi-based smart home, every single smart bulb, robotic vacuum, Wi-Fi plug, smart camera, and thermostat you buy dramatically spams your primary home network. Suddenly, your router's client table is flooded with dozens of chatty, low-bandwidth IoT devices. If you mix all of these IoT devices with high-throughput devices like your gaming PC or streaming 4K files from your NAS, this can create both network congestion and a major security blind spot. Instead of throwing away an old dual-band Wi-Fi router that you got sitting in a drawer, you can configure it as a dedicated isolated access point running on a separate subnet, strictly for IoT gear. You don't need to buy expensive enterprise-grade networking gear to segment your home network. By converting an old router, you free up your main network's airtime, isolate and secure devices, and keep your primary traffic running clean. What are the risks when you put IoT devices on your main network? Security and latency are issues The SwitchBot Hub 3 (R) is an excellent example of a smart hub that is useful within your smart home, provided you have other devices in the SwitchBot ecosystem. Mixing IoT and main traffic can absolutely suck, and it causes an architectural headache when you have a flat home network like this. This is down to 2.4GHz airtime starvation. Most smart home devices only really speak legacy 2.4GHz Wi-Fi. Some newer devices may be migrating to 5GHz, but it's still quite rare. When your IoT devices are constantly spamming keep-alive packets and cloud telemetry pings on your main router, they consume precious airtime, introducing micro-stutters and latency spikes for your high-performance 5GHz and 6GHz devices. On top of this, you also risk security attacks. This is because cheap IoT devices often run outdated firmware with known vulnerabilities. If a smart plug or Wi-Fi appliance gets compromised, a flat network architecture can give attackers an open door straight to your NAS, personal computers, and sensitive file shares. How to build an isolated IoT access point Make sure you configure your router correctly I found that I was dealing with a lot of latency despite my hardware being absolutely fine, so I decided to build an isolated IoT access point. First, wipe and update your old router. Reset your old dual-band router to factory defaults and check that its final firmware version is installed. It's worth noting: if your router is so old that it's no longer supported by the manufacturer with security updates, do not implement it into your network. You don't want to provide another unsecure point of contention for hackers to access. Once you've done this, time to configure access point mode. You can log into your router's admin panel, disable the DHCP server, assign it a static IP address on your primary network subnet, and then disable its WAN port routing functions. This is essentially configuring the old router not to act as a router by turning off DHCP and NAT, but putting it strictly into access point mode so it bridges traffic cleanly back to your primary firewall/router. Next, create the dedicated SSID. You can name your new 2.4GHz SSID specifically for smart home gear or something that you'll remember, and keep it separate from your main network credentials. And lastly, migrate all of your devices and isolate them. Slowly move your smart devices over to the new access point and set up your firewall isolation rules on your primary gateway. By setting up this isolation or guest network boundary, you're essentially blocking IoT devices from initiating communication back to your trusted primary network devices, so if there ever is a hacker accessing your network through them, you're still safe and protected. Once you've set up this separate access point, the best point of call is to dedicate the 2.4GHz band solely to smart gear (leaving the old router's 2.4GHz radio exclusively for those plug switches and sensors), while letting your main router handle clean high-speed 5GHz or 6GHz traffic for your phones, laptops, and media clients. This will ensure you have that pristine, speedy Wi-Fi. You might encounter some issues Set up clear firewall rules Unfortunately, this method isn't completely foolproof, and you may run into practical hurdles with configuration and routing. It's essential to properly bridge the old router as an access point rather than plugging in just one port blindly. Doing this can create an unnecessary nested subnet and break local device discovery, like your Chromecast or Home Assistant integrations. To prevent double NAT, bridge the old router correctly. When setting up your firewall rules, you may want to create explicit rules so your smart home hub (like Home Assistant) can still talk to IoT devices across the subnet (without letting IoT devices phone home unfiltered or access your personal workstations). Protect your network And reclaim your speeds A clean network isn't just about fast internet plans; it's about proper traffic segregation. Repurposing an old router into a dedicated IoT access point turns e-waste into an enterprise-grade security and performance upgrade. Dig that router out of the drawer of shame, set it up as a dedicated IoT access point, and watch your primary network run smoother and safer than ever before.