An old dual-band router can add a separate Wi-Fi network for smart-home devices if it supports access point (AP) mode and can connect to your main router over Ethernet. That can keep IoT devices off your primary Wi-Fi name, but a different SSID alone does not prove they are blocked from the rest of your home network. The exact setup and security boundary depend on the router model and its settings.
What this setup changes—and what it doesn’t
In this arrangement, your main router continues to route traffic and assign network addresses. The older router acts as a wireless access point, extending the existing wired network over Wi-Fi. TP-Link describes AP mode as “turning a wired network connection into a Wi-Fi network” in its How to Set Up a TP-Link Router as an Access Point guide.
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You can give the added Wi-Fi a distinct name, such as “Home-IoT,” and connect smart devices to it. That separates which SSID those devices use; it does not, by itself, establish that they cannot communicate with devices on the main network. Treat the name as organization, not a security boundary.
Check the old router before changing its mode
Find the exact model number, then consult its manual or manufacturer support page. Look in the interface for an “Operation Mode” menu or a setting explicitly labeled “Access Point.” Menu names, required ports, and available guest-network controls differ by model, so do not assume another router’s instructions apply.
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Before switching modes, check whether you rely on features that may be gateway-dependent. TP-Link’s AP-versus-router comparison lists parental controls, QoS, bandwidth control, NAT forwarding, IPv6, and VPN among features unavailable in AP mode on applicable models; availability varies by model. See TP-Link’s AP mode and router mode comparison and verify the capabilities of your own device.
Connect and configure the access point
If the router has a guided AP mode
- Open the router’s administration interface and select its documented “Access Point” or equivalent operating mode.
- Follow the model’s instructions for connecting it to the main router. TP-Link’s guide documents an Ethernet connection from the main router; the correct port can depend on the model and setup method.
- Set a recognizable IoT SSID and a strong Wi-Fi password using the available wireless settings. If the router offers separate 2.4 GHz and 5 GHz settings, check the requirements of your IoT devices before choosing which bands to enable.
- Save the settings and connect a test device to the new Wi-Fi network.
The Ethernet link is required for the documented wired setup. If you do not already have a suitable cable, an Ethernet cable is the relevant item; there is no need to buy one if you already have a cable that reaches between the routers.
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If there is no AP-mode setting
Do not apply a generic manual recipe without checking the exact model’s documentation. TP-Link’s documented manual path for applicable devices assigns the old router a LAN IP address on the main router’s subnet but outside the main router’s DHCP address range, disables DHCP on the old router, and connects the units LAN-to-LAN. Those are vendor-specific instructions, not universal steps for every router. Follow the guide for your model, including any port or address details it specifies.
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Check whether the IoT network is actually separated
After setup, inspect the old router’s guest-network or local-access controls. Check whether IoT clients can reach the main LAN and whether they can communicate with one another. Where the interface offers settings such as “Allow guests to access my local network” or peer-to-peer access, read the descriptions carefully and set them according to your goal.
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These controls can behave differently by model and operating mode. TP-Link warns in its AP-mode comparison that “In Access Point mode, the Guest Network is no longer isolated from the main network,” while also noting that feature availability varies by model. Its guest-network guidance describes local-network access and client communication settings, but the presence of a guest SSID does not guarantee those protections in every configuration.
If preventing access to the main network matters, verify the behavior with the actual router and firmware rather than relying on the SSID name or a checkbox label. A separate SSID may make device management tidier while still leaving devices on the same underlying network.
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AP isolation and VLANs are different controls
AP or client isolation can prevent devices connected to the same wireless network from communicating with one another. VLAN separation is a different mechanism that can separate supported network segments or SSIDs. Neither feature should be assumed to exist on an ordinary consumer router, and their scope depends on the hardware and configuration.
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For example, TP-Link’s Pharos documentation describes VLAN separation for supported SSIDs but says wired clients are not included in that separation. That product-specific behavior is not a guarantee about other Pharos models or home routers. See TP-Link Pharos documentation on AP isolation and VLAN for the stated example.
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Know the trade-offs and the double-NAT question
Using AP mode behind an existing router is one way to avoid creating double NAT, according to TP-Link’s setup guidance for its newer interface: How to configure a TP-Link router in Access Point mode. That is a network-setup consideration; it does not mean AP mode isolates IoT devices.
The practical outcome is a second wireless network supplied by the old router, with the main router still serving as the gateway. Whether that network is also a security boundary depends on the specific isolation features supported and enabled on the equipment.
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