How to Turn an Old Router into an Access Point

What access point mode changes

An access point is a device that adds Wi-Fi coverage to a network. When you set an old router to access point mode, it stops acting as a router: it no longer assigns IP addresses, performs network address translation, or manages the internet connection. Those jobs stay with your main router. The old router simply accepts wireless clients and passes their traffic over the Ethernet cable to the main network. This is the difference explained in access point versus router.

The IEEE 802.11 standard defines the medium access control and physical layer specifications for wireless LANs, which is the technical foundation for Wi-Fi access points. A home router can therefore be repurposed as an access point without special hardware, as long as it has Ethernet ports and an admin page where you can change its operating mode or LAN settings.

Why an old router works as an access point

Most routers from the Wi-Fi 4 generation and later can still extend useful coverage. Wi-Fi 4, introduced in 2009, was designed to deliver plenty of throughput for music and video and to support many users without sacrificing signal strength. Wi-Fi 5, introduced in 2014, added dual-band operation in the 2.4 GHz and 5 GHz bands. Wi-Fi 6, introduced in 2018, brought OFDMA, multi-user MIMO, 160 MHz channel capability, and target wake time. Any of these generations can cover a garage, workshop, or guest room even when the far location does not need the fastest link.

Because the old router connects by Ethernet, it does not repeat traffic wirelessly. A wired connection gives the access point the same quality of link as other wired devices on the network and avoids the extra airtime that wireless repeating consumes. The old router's Wi-Fi generation still sets the ceiling for clients that connect to it, so a modern phone on an older access point runs at the older standard's rates. For a different use of the same hardware, see how to turn an old router into a network switch.

What you need before you start

Before you begin, gather your main router, the old router with its power adapter, an Ethernet cable long enough for the run, and a laptop or phone to open the admin pages. If you do not remember the old router's admin password, factory reset the router before continuing.

Placement matters. Put the old router where your main Wi-Fi signal is weak but an Ethernet cable can still reach, such as the far side of a wall, a basement workshop, or an outbuilding. See router placement for antenna and height tips.

• Main router: keeps doing routing, DHCP, and firewall duties.
• Old router: becomes the access point after its LAN IP and DHCP are changed.
• Ethernet cable: carries the network between the two routers.
• Admin access: used to change settings from a browser-based page.

Step 1: Enable access point mode in the interface

Many routers include an access point mode. Look for it under names such as Operation Mode, Wireless, Advanced Setup, or Network Settings. Selecting that mode tells the router to stop acting as a DHCP server and NAT gateway. Some models automatically change the router's LAN IP address, and some show a short wizard that asks for your main router's IP address.

Access point mode is the safest approach because the firmware makes the related changes together. If your router has this setting, use it and you can skip most of the manual steps below. The manual steps are for routers whose firmware only offers router mode or bridge mode.

Step 2: Connect the Ethernet cable LAN to LAN

Connect one end of the Ethernet cable to a LAN port on the main router and the other end to a LAN port on the old router. Do not use the old router's WAN or Internet port. The WAN port expects a modem connection and creates a separate network when it is plugged into another router, which leads to double NAT.

With a LAN-to-LAN connection, both routers sit on the same subnet. A computer connected to either router can reach devices on the other side, and the main router remains the only gateway. This wired link behaves like Ethernet backhaul in a mesh system.

Step 3: Change the LAN IP and disable DHCP

When the router has no access point mode, configure it by hand. Start with the LAN IP address: give the old router an address in the same subnet as the main router, outside the range the main router assigns through DHCP. Avoid duplicate addresses, because two devices on the same network cannot share one IP address.

Next, turn off the DHCP server on the old router. With DHCP off, every device on the network receives its addressing from the main router. DHCP explains how the assignment process works.

Finally, leave the WAN port unconnected. In manual access point mode, the old router uses only its LAN ports and wireless radios. The result is a device that behaves like an access point even when the firmware calls it something else.

Set the Wi-Fi name, channel, and security

Give the old router the same SSID as the main router or a different one. A single SSID makes roaming simpler, because your phone or laptop sees one network name and can switch between the two access points. Different names make it obvious which radio you are connected to but usually mean choosing a network manually. SSID and Wi-Fi roaming cover the tradeoffs.

Choose a Wi-Fi channel for the old router that does not overlap the main router's channel when the two are close together. Newer Wi-Fi generations also include features that help access points cooperate in dense settings; Wi-Fi 8, for example, is designed to let access points collaborate instead of competing for spectrum, according to the Wi-Fi Alliance.

Security comes first. Use the strongest wireless security the old router supports. WPA3 is mandatory for Wi-Fi CERTIFIED devices and gives WPA3-Personal networks increased protection from password guessing attempts, according to the Wi-Fi Alliance. If the old router cannot run WPA3, choose the best security mode it offers and keep the network password strong. Keep the router's firmware updated and change its admin password from the default; NIST develops cybersecurity standards, guidelines, and best practices that apply to networked devices.

When to buy a mesh system instead

Converting an old router works well when you have an Ethernet run and the old router is not many generations behind your main router. The limits are real: you manage two separate admin interfaces, and roaming depends on the client device. If you want one SSID, coordinated roaming, and simpler management, a mesh Wi-Fi system is usually the better tool. Mesh versus access points compares the two approaches.

Choose a mesh system when you need more than one additional coverage area, when your spare router cannot support current security features, or when you prefer to manage the whole network from one app. If the home is large, the best mesh Wi-Fi systems guide is a good starting point. If you only need one extra zone and already have the hardware, access point mode avoids the purchase entirely.

What to pick for your use

Questions

Can any old router become an access point?

Most Wi-Fi routers can, as long as they have a LAN Ethernet port and an admin page that lets you change operating mode or LAN settings. Practical candidates come from Wi-Fi 4 (2009) and later. Even a Wi-Fi 4 or Wi-Fi 5 router can add useful coverage to one more area, although its wireless features will be older than a current main router's.

Should I plug the old router into the main router's LAN port or WAN port?

Use LAN ports on both routers. The WAN port expects a modem-style connection and creates a separate network when attached to another router, which leads to double NAT. In access point mode the old router leaves its WAN port unused.

Do I need to disable DHCP on the old router?

Yes. Only the main router should assign IP addresses. If the old router keeps its DHCP server on, devices may receive conflicting network settings. Access point mode usually disables DHCP automatically; in manual mode you must turn it off.

Will using an old router as an access point slow down my network?

The Ethernet connection between the routers avoids the airtime penalty of a wireless repeater, because the access point does not use radio spectrum just to talk to the main router. The old router's Wi-Fi generation does limit clients that connect to it, so a modern laptop on a Wi-Fi 5 access point operates at Wi-Fi 5 rates. For heavier traffic, use the access point for light-duty devices or upgrade the old router.

Should the old router use the same Wi-Fi name as my main router?

It often makes sense. A single SSID means your devices see one network and can move between the two access points without manual switching. The client makes the final roaming decision, so results vary by device. A mesh system coordinates roaming more smoothly if that matters to you.

What if my router does not have access point mode?

Use the manual method: set a LAN IP address in the same subnet as the main router, turn off DHCP, and connect LAN to LAN while leaving the WAN port unconnected. The old router then works as an access point even if the firmware does not say so. Related firmware modes are covered in bridge mode versus access point mode.

Can I use the old router as an access point without an Ethernet cable?

Not for a true access point. Without a cable, the old router would connect to the main router over Wi-Fi, which is repeater mode. A wireless link can work, but it uses extra airtime and usually delivers lower throughput than a wired connection. For that reason this guide assumes an Ethernet cable between the two routers.