Yes—an old router can extend your Wi-Fi if its hardware and firmware support the right setup. If you can connect it to the main router with Ethernet, use it as a wired access point: that is usually more reliable than repeating Wi-Fi. Without Ethernet, use the old router’s official Range Extender or Repeater mode if it has one. WDS and custom firmware are more complicated and may not work across different brands.
Choose the right setup
| Situation | Best option | What to know |
|---|---|---|
| You can run Ethernet to the weak-signal area | Wired access point | Usually the most reliable way to reuse the router. Connect the main router’s LAN port to the old router’s LAN port for a basic bridged setup. |
| No Ethernet, and the old router officially supports Range Extender or Repeater mode | Built-in wireless repeater mode | Follow the instructions for the exact model and hardware revision; not every router has this feature. TP-Link’s guide describes it for selected models. |
| No built-in repeater mode, but both routers support compatible WDS | WDS | Compatibility and security limitations need checking; support can vary by brand and chipset. |
| No suitable built-in option and you are comfortable with advanced networking | Supported third-party firmware | Verify the exact model and hardware revision before installing anything. Firmware for a similar-looking model may not work. |
An access point receives its network connection over Ethernet and broadcasts Wi-Fi. A wireless repeater receives Wi-Fi and retransmits it, so it must be placed where the main router’s signal is still usable. A wireless bridge connects a remote device or network over Wi-Fi; what it can provide depends on the router’s implementation. Manufacturers do not use “repeater,” “bridge,” “WDS” and “access point” as interchangeable labels.
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Check the old router before setup
- Find the exact model number, hardware revision and firmware version. Features can differ between revisions of the same model.
- Check the manufacturer’s manual or support page for AP, Range Extender, Repeater, Bridge or WDS support, and confirm which modes are available for your revision.
- Check whether the device still receives security updates and supports a security mode suitable for your home network. Do not weaken the main network just to make an old feature work.
- Have the main router’s Wi-Fi name and password, administrator credentials, and an Ethernet cable ready if you plan to use access-point mode.
- If you cannot log in to the old router, use the manufacturer’s reset instructions. A reset erases its saved settings; ASUS also advises resetting a router if its administrator credentials are forgotten in its WDS setup guidance.
For a wireless repeater, choose a location that is close enough to the main router to receive a solid signal and close enough to the weak area to help. A repeater cannot improve a connection it can barely receive.
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This procedure describes a basic bridged access point. Menu names vary, so follow the device maker’s instructions if it offers a dedicated AP mode. OpenWrt’s bridged access-point guide specifies a LAN-to-LAN connection for this setup.
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- Connect to the old router locally. Plug a computer into one of its LAN ports, or connect to its Wi-Fi, then open its administration page. Use the router’s manual to find the address and login details. If its previous configuration is unknown, reset it first.
- Use a dedicated AP mode if the router provides one. Follow the maker’s instructions for that mode; it may disable routing and DHCP automatically. If there is no AP mode, continue with the manual bridged setup below.
- Give the old router a non-conflicting management address. Check the main router’s LAN address and choose an unused address in the same subnet. For example, if the main router is
192.168.1.1,192.168.1.2may work if it is not already in use and fits the network’s address-allocation rules. Do not copy the example blindly. After saving the change, use the new address to reopen the old router’s settings. - Disable the old router’s DHCP server. The main router should normally be the only device assigning addresses on the home LAN. Do not confuse the DHCP server with a DHCP client: some AP modes use a client to obtain a management address. If the router offers a dedicated AP mode, follow its instructions for DHCP, NAT and firewall settings rather than making assumptions from menu names.
- Set up Wi-Fi. Choose a network name (SSID) and password. You can use the same name and password as the main router, or a different name to make the access points easier to distinguish while testing. Use a security mode supported by your devices and both routers. If setting channels manually, choose a suitable channel for your band and local conditions.
- Connect the routers LAN-to-LAN. Run Ethernet from a LAN port on the main router to a LAN port on the old router.
Main router LAN port → Old router LAN port
For the basic bridged setup, do not connect the cable to the old router’s WAN/Internet port. Use that port only if the manufacturer’s dedicated AP-mode instructions explicitly tell you to.
- Reboot and test. From the area you want to improve, connect a phone or computer to the old router’s Wi-Fi. Check that it gets a valid network address and that its default gateway is the main router. Confirm internet access, access to local devices across both access points and access to the old router’s administration page at its new address. Check the connection where coverage was weak, rather than judging the setup only from beside the router.
Same Wi-Fi name or a different one?
Matching the SSID and password can make the two access points easier to use as one household network. It does not turn them into a managed mesh: client devices make their own roaming decisions and may stay connected to the weaker access point. A different SSID makes it easier to choose an access point manually and to diagnose problems.
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If you cannot run Ethernet: use official repeater mode
Use this option only if the old router’s manual confirms it supports wireless Range Extender or Repeater mode. The setup labels and steps depend on the model.
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- Reset the old router if needed, then connect to it locally and open its web-management page.
- Look for a setting such as Operation Mode, Range Extender or Repeater. Confirm the choice in the manual for your exact model and revision.
- Scan for the main router’s Wi-Fi, select it and enter its password. If prompted, choose the name the old router will broadcast.
- Save the settings, reboot and move the router to a spot where it still gets a strong signal from the main router.
- Test from the weak-signal area. If the connection is unstable, move the repeater closer to the main router before changing other settings.
For example, TP-Link’s documented route is Operation Mode → Range Extender on selected compatible models, including the Archer A54 V1. ASUS documents a repeater setup in which the router joins the existing wireless network through its web interface or quick-setup flow. These are examples, not universal menus: see TP-Link’s instructions and ASUS’s repeater guide for their supported devices.
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Expect a performance trade-off
A wireless repeater uses airtime to receive the upstream connection and serve local clients. That can mean lower throughput or more latency than a wired access point, but there is no fixed speed penalty: results depend on radio design, backhaul band, signal strength, walls, interference, client devices and firmware. It improves reach, not the bandwidth supplied by your internet plan.
WDS and custom firmware are advanced fallbacks
WDS is not a universal cross-brand feature
WDS can link access points wirelessly, but both routers’ support and settings need to be compatible. OpenWrt explains that WDS implementation details are not fully specified, which can cause interoperability problems between vendors or chipsets. ASUS’s documented WDS setup calls for the same channel and recommends matching channel bandwidth and related wireless settings; its listed authentication options for that mode are Open System/NONE and Open System/WEP. Those limitations are a reason to verify the exact models—and not to enable open authentication or WEP on a modern home network just to make WDS work. See OpenWrt’s WDS notes and ASUS’s WDS instructions.
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Custom firmware requires model-specific verification
OpenWrt documents WDS and other configurations, including relayd for some situations where the main router does not support WDS or mesh. These are more complex than a standard AP setup. Check the firmware’s device support and installation instructions for the exact model and hardware revision before proceeding; an incorrect or unsupported installation can leave the router unusable.
Troubleshoot the common problems
There is no Range Extender or Repeater option
The feature may not exist on that model, may be limited to a particular hardware revision, or may be named Bridge, Client or WDS. An ISP-customized firmware may also restrict available modes. Check the maker’s manual for the exact device, then use wired AP mode if possible. Consider third-party firmware only after confirming exact compatibility.
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Devices get internet but cannot see one another
The old router may still be routing a separate subnet, creating double NAT. For an ordinary home network, switch to the router’s AP mode or configure a bridged LAN-to-LAN access point with the old router’s DHCP server disabled. A separate routed network can be intentional when isolation is the goal, but it is not the usual way to extend one home LAN.
Devices connect but have no internet
- Confirm the repeater has joined the main Wi-Fi and that its password is correct.
- Move it closer to the main router if its upstream signal is weak.
- Check that DHCP is enabled on the main router and that the old router does not have a conflicting LAN address.
- Inspect the client’s network details for a valid address, gateway and DNS server.
- For a bridged AP, verify the cable runs from LAN to LAN unless a specific AP-mode guide requires another port arrangement.
You cannot open the old router’s administration page
If you changed its LAN address, the old address no longer applies. Find the new address in the main router’s connected-device or DHCP-client list, or connect directly and inspect the device’s network details. Factory-reset only if necessary; it removes the configuration.
The wireless repeater is slow or unstable
Move it closer to the main router, test a different band or less congested channel if available, and update firmware when a supported update exists. A different SSID can help identify whether a device is connecting to the repeater. If the link remains poor, Ethernet-backed AP mode avoids using Wi-Fi for the upstream connection.
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Check for incompatible security settings, access-control or MAC-filter rules, band behavior, outdated firmware, WDS incompatibility or devices clinging to a distant access point. A temporary separate SSID can help diagnose which access point a device is using. Do not switch to an obsolete security mode as a workaround.
When the old router is not worth reusing
Use a current access point or extender instead if the old router cannot use an acceptable security configuration, no longer receives security updates, is unstable, or cannot deliver the performance you need. For several dead zones or coordinated roaming, a matched mesh system may be more suitable than two unrelated routers. A shared Wi-Fi name alone is not mesh; for example, TP-Link’s cited Deco configuration requires a physical Ethernet connection for the main unit and does not support generic repeater mode (Deco support guidance).
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