Old Router as Wi-Fi Extender: Step-by-Step

If you have a spare router gathering dust, you can turn it into a Wi-Fi extender to boost coverage in dead zones without buying new hardware. This guide walks you through connecting the old router to your main one via Ethernet (best performance) or wirelessly (easier setup), so you get a stronger signal in every room.

What You’ll Need

• An old router (any brand, preferably with at least one Ethernet port)
• A computer or smartphone to access the router’s settings page
• An Ethernet cable (for wired mode)
• Your main router’s Wi-Fi name and password (for wireless mode)
• Admin credentials for the old router (often printed on a sticker, or default like admin/admin)

Step-by-Step

1. Reset the old router. Press and hold the reset button (usually on the back or bottom) for 10–15 seconds until the lights blink. This clears any previous settings that could interfere.
2. Connect to the old router. Plug the old router into power. Use an Ethernet cable to connect your computer to one of its LAN ports (not the WAN/internet port). If your computer has no Ethernet port, connect to its Wi-Fi network (it may be named something like “TP-Link_1234” or “NETGEAR-5G”).
3. Access the router’s settings. Open a browser and go to the router’s IP address. Common ones are 192.168.1.1, 192.168.0.1, or 192.168.2.1. If unsure, check the router’s label or search online for the default IP. Enter the admin username and password (often both “admin” or “admin”/”password”).
4. Set the operation mode. Look for a menu called “Operation Mode,” “Working Mode,” or “Wireless Mode.” Change it to “Repeater,” “Range Extender,” or “Access Point” (AP) depending on what you want:
5. For wired (AP) mode: Choose “Access Point” or “AP Mode.” This requires an Ethernet cable from the old router to the main router. You’ll set a new Wi-Fi name (SSID) and password for the old router, or use the same as the main router for seamless roaming (though not always seamless).
6. For wireless (repeater) mode: Choose “Repeater” or “Range Extender.” The router will scan for nearby networks. Select your main Wi-Fi network, enter its password, and the old router will broadcast its own network (often with “_EXT” appended).
7. Configure wireless settings. If you chose AP mode, set a unique SSID (e.g., “LivingRoom_EXT”) and a strong password (WPA2/WPA3). If you chose repeater, the router may copy the main network’s name automatically, but you can change it later.
8. Assign a different IP address (if needed). In AP mode, the old router must have an IP in the same subnet as the main router but not conflicting. For example, if main router is 192.168.1.1, set old router to 192.168.1.2. Look for “LAN IP” or “Network Settings” and change it. In repeater mode, this is usually automatic.
9. Disable DHCP (only for AP mode). The main router should handle IP addresses. Find “DHCP Server” and set it to “Disabled” or “Off.” This prevents conflicts.
10. Save and reboot. Click “Save” or “Apply,” then reboot the router. Unplug the Ethernet cable from your computer (if wired) and reconnect to the new network.
11. Place the old router strategically. For wired AP, place it where you need coverage, connected via a long Ethernet cable. For wireless repeater, place it halfway between the main router and the dead zone, but within good range of the main router (about 50% signal strength).
12. Test the connection. Walk around with your phone or laptop and check signal strength in the previously weak areas. If it’s still poor, move the old router closer to the main one.

Common Mistakes

• Using the WAN port instead of LAN. In AP mode, the Ethernet cable from the main router must go into a LAN port on the old router, not the WAN/internet port. Using WAN will prevent it from working.
• Forgetting to disable DHCP in AP mode. Two DHCP servers on the same network cause IP conflicts and random disconnects.
• Placing the repeater too far from the main router. If it can’t get a strong signal, it will just rebroadcast a weak signal. Always place it within good range.
• Keeping the same SSID for both networks. While it can work, devices may not switch automatically. Using a different SSID for the extender gives you manual control.
• Skipping the reset. Old settings (like a different subnet) can cause the router to be unreachable or conflict with your main network.

Tips

• Use wired mode whenever possible. An Ethernet backhaul gives you full speed and reliability. Wireless repeaters cut bandwidth roughly in half.
• Choose a different Wi-Fi channel. If your main router uses channel 6, set the extender to channel 1 or 11 to reduce interference (only if you’re using a different SSID).
• Update the old router’s firmware. Check the manufacturer’s website for the latest firmware to fix bugs and improve compatibility.
• Use the same security settings. Match the Wi-Fi encryption (WPA2/WPA3) and password type to your main network for easier device connection.
• Label the extender. If you use a different SSID, write it down on the router so you remember which network is which.

Troubleshooting

• Can’t access the old router’s settings. Make sure you’re connected to it (not the internet). Try a different IP address (like 192.168.1.1 or 192.168.0.1). If that fails, reset again and try immediately.
• No internet after setup. In AP mode, check that the Ethernet cable is in a LAN port and that DHCP is off. In repeater mode, verify the Wi-Fi password for the main network was entered correctly.
• The extender is slow. Move it closer to the main router (for wireless mode) or check for interference from walls/electronics. Also, ensure you’re not using an old Wi-Fi standard (like 802.11b) — set it to 802.11n or ac if available.
• Devices keep dropping. This often happens with IP conflicts. Disable DHCP on the old router (AP mode) and make sure its IP is outside the main router’s DHCP range (e.g., if main router hands out 192.168.1.100-200, set old router to 192.168.1.2).
• Can’t find the extender’s Wi-Fi network. Reboot the old router and wait a minute. If it still doesn’t appear, reset and redo the setup.

Frequently Asked Questions

Can I use a different brand router as an extender?

Yes, any router with repeater or AP mode will work. The setup steps are similar, but the menu names vary. If your router lacks a repeater mode, you can still use it as an AP via Ethernet.

Will the extender slow down my internet?

Wireless repeaters can cut speed in half because they relay data. A wired AP keeps full speed. For most browsing, half speed is fine, but for gaming or 4K streaming, wired is better.

Do I need to connect the old router to the main router with a cable?

No, wireless repeater mode works without a cable. However, a wired connection (AP mode) is more reliable and faster. Choose based on your situation.

How do I find my router’s IP address?

Check the label on the router, or on Windows run ‘ipconfig’ and look for “Default Gateway.” On Mac, go to System Settings > Network > your connection > Details > Router.

Can I use the old router’s USB port for anything?

Some routers allow USB storage sharing, but that’s separate from extending Wi-Fi. You can ignore the USB port for this purpose.

What if my old router doesn’t have a repeater mode?

You can still use it as an access point via Ethernet. If you need wireless repeating, you can install custom firmware like DD-WRT, but that’s advanced and not covered here.

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