Key takeaways
- Find the main router’s LAN address, commonly 192.168.0.1 or 192.168.1.1.
- Check the old router’s label or administration page for its hardware revision and firmware version.
- Back up the old router’s configuration, then perform a factory reset if it was previously used on another network.
- Use a laptop or desktop connected by Ethernet during setup. This prevents losing access when the old router’s IP address changes.
- Confirm that the old router supports the required feature. Menus may be named Operation Mode, Wireless Bridge, Repeater, Range Extender, WDS, or Access Point.
What's inside
To use a router as a WiFi extender, choose access-point mode when you can run Ethernet, repeater or range-extender mode when you cannot, and WDS bridge mode only when both routers support compatible WDS settings.
An old router can improve coverage without buying another device, but the mode determines whether performance improves or collapses. A wireless repeater receives and retransmits data on the same radio, so usable throughput commonly falls by about 40–60%. An access point uses a wired backhaul and normally preserves most of the main router’s WiFi capacity.
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Which mode should you choose?
| Mode | Backhaul | Typical usable speed | Best for | Main limitation |
|---|---|---|---|---|
| Access point | Ethernet cable | 70–95% of wired link capacity | Homes with cable access; streaming and work | Requires an Ethernet run |
| Repeater | WiFi, usually same band | 35–60% of the original WiFi rate | Temporary coverage fixes and rented homes | Wireless retransmission consumes airtime |
| WDS bridge | WiFi between compatible routers | 30–55% on a single radio | Older routers with WDS support | Compatibility and encryption problems |
| Dual-band wireless bridge | One band for backhaul, one for clients | 50–80% of the backhaul band’s rate | Wireless extension with less congestion | Both routers must support the required mode |
For example, if the main router delivers 300 Mbps at the proposed extender location, a same-band repeater may provide approximately 105–180 Mbps to a nearby device before interference and protocol overhead. A wired access point connected through a gigabit Ethernet cable may provide roughly 200–500 Mbps over WiFi, depending on the router’s radio and the client device.
Before you begin
- Find the main router’s LAN address, commonly 192.168.0.1 or 192.168.1.1.
- Check the old router’s label or administration page for its hardware revision and firmware version.
- Back up the old router’s configuration, then perform a factory reset if it was previously used on another network.
- Use a laptop or desktop connected by Ethernet during setup. This prevents losing access when the old router’s IP address changes.
- Confirm that the old router supports the required feature. Menus may be named Operation Mode, Wireless Bridge, Repeater, Range Extender, WDS, or Access Point.
Best method: configure the old router as an access point
This is the preferred way to connect a WiFi extender to a router because Ethernet carries the backhaul separately from wireless client traffic.
Step 1: Give the old router a suitable management address
Log in to the old router, open LAN, Network, or Local Network settings, and assign it an unused address on the main router’s subnet. If the main router is 192.168.1.1, use an address such as 192.168.1.2. Avoid the main router’s DHCP range; if DHCP starts at 192.168.1.100, 192.168.1.2 is normally suitable.
Set the subnet mask to 255.255.255.0 and use the main router’s address as the gateway if the firmware requests one. Save the setting and reconnect to the new address.
Step 2: Disable duplicate network services
Turn off the old router’s DHCP server, firewall/NAT functions, and WAN-based routing if the firmware offers an access-point mode. The main router should be the only device assigning IP addresses. Two DHCP servers can cause intermittent failures, incorrect gateways, and devices that connect without internet access.
If there is no access-point mode, connect the Ethernet cable to a LAN port on the old router, not its WAN or Internet port. Some firmware has a specific “LAN-LAN access point” guide that automatically disables routing.
Step 3: Set the wireless networks
You can copy the main router’s SSID, security type, and password so devices can roam between them, although roaming is not guaranteed with basic consumer firmware. Use WPA2-Personal (AES) or WPA3-Personal where both routers support it. Do not use WEP or WPA/TKIP.
For a predictable first setup, give the access point a distinct name such as Home-Downstairs. Set 2.4 GHz to a fixed 20 MHz channel—1, 6, or 11—and choose the least congested one. On 5 GHz, use an ordinary non-DFS channel such as 36, 40, 44, or 48 if older devices have connection problems.
Step 4: Connect and verify
Run the Ethernet cable from a LAN port on the main router to a LAN port on the old router. Connect a phone or laptop to the second router’s WiFi, then confirm that it receives an address from the main router, can open the old router’s management page, and reaches the internet. A speed test should be compared at the same location before and after installation.
How to use a router as a repeater without Ethernet
A repeater is useful when running cable is impractical, but placement matters more than maximum signal bars. The old router must receive a strong, clean signal before it can retransmit one.
- Factory-reset the old router and open its Operation Mode menu.
- Select Repeater, Range Extender, or Wireless Repeating.
- Scan for the main WiFi network and select its exact SSID and band.
- Enter the main network password and choose the same security method, normally WPA2-AES or WPA3.
- Assign the old router a free LAN address, such as 192.168.1.2, and disable its DHCP server if the repeater wizard does not do so automatically.
- Set the extended SSID. A separate name makes troubleshooting easier; the same name can make movement between rooms more convenient.
- Save, reboot, and test the connection from the target room.
Some routers cannot repeat a WPA3-only network, a hidden SSID, or a 5 GHz network using DFS channels. If the scan finds nothing, temporarily set the main router to WPA2-AES and a non-DFS 5 GHz channel. Restore stronger settings only after confirming compatibility.
When WDS bridge mode is appropriate
WDS is an older wireless distribution method that allows one router to bridge to another. It is not a universal standard in practical consumer firmware: two routers from different manufacturers may expose different WDS implementations, and some support only open or WPA2 networks.
On the main router, open Wireless > WDS or Bridge, enable it, and record the wireless MAC address. On the old router, enable WDS, enter the main router’s MAC address, choose the same channel, SSID, bandwidth, and security settings, then disable DHCP on the old router. Give it a static LAN address outside the DHCP pool.
Use WDS only after checking that both devices document compatibility. If the bridge connects but clients have no internet, check that the old router is in bridge or access-point mode rather than router mode. If speeds are poor, use a wired access point or a dual-band bridge instead.
Placement rules that prevent bandwidth collapse
- Place a wireless repeater about halfway between the main router and the weak area, not inside the dead zone.
- Aim for at least -60 to -67 dBm received signal at the repeater. Around -70 dBm or weaker usually produces retries and unstable speed.
- Keep the router in open air, roughly 1–1.5 metres above the floor. Avoid metal cabinets, televisions, microwave ovens, thick concrete, and large appliances.
- Do not hide it behind furniture simply because the signal reaches the room. A cleaner path often matters more than a shorter distance.
- For a 2.4 GHz repeater, use 20 MHz channel width in crowded buildings. The nominal 300 Mbps link rate is not the same as 300 Mbps of usable throughput.
- For a dual-band repeater, reserve one band for the wireless backhaul if possible. Client devices should use the other band to avoid competing with the extender-to-router link.
Common mistakes and ownership realities
Old routers often have 100 Mbps Ethernet ports, weak 2.4 GHz radios, or firmware that no longer receives security updates. A 100 Mbps access point cannot deliver a 500 Mbps internet connection even if its WiFi label claims a higher theoretical rate. It may still be adequate for browsing, smart-home devices, and a single HD stream.
Heat, dust, and aging power adapters are more likely to cause failures than the plastic case itself. Keep ventilation openings clear, replace a warm, buzzing, or loose power adapter only with one matching the original voltage, polarity, and sufficient amperage, and reboot the device only as a troubleshooting measure—not as a permanent fix.
Finally, update firmware before deployment, change the administrator password, disable remote administration, and remove unused services such as WPS if the firmware permits. If the old router cannot use modern encryption or has no security updates, use it only on an isolated guest or IoT network—or replace it with a current access point.
Quick decision guide
| Your situation | Recommended choice | Why |
|---|---|---|
| Ethernet cable can reach the weak room | Access point | Highest throughput and simplest troubleshooting |
| No cable, but the old router supports dual-band repeating | Dual-band repeater | Separates client traffic from the backhaul |
| Very limited budget and light browsing only | Single-band repeater | Low cost, acceptable for basic use despite the speed loss |
| Two older routers list compatible WDS support | WDS bridge | Useful where the firmware lacks a modern repeater wizard |
| Gaming, 4K streaming, or fast file transfers | Wired access point or mesh system | More consistent latency and capacity than same-band repeating |
The practical rule is simple: use Ethernet and access-point mode whenever possible. Use router-as-repeater mode for convenience, place it where the source signal is still strong, and expect wireless extension to trade some capacity for coverage.
