Many users face a situation where their main router's coverage area doesn't cover their entire apartment or house. The signal becomes weak in distant rooms, and high-quality video no longer loads. The ideal solution in such cases is to use an old or secondary router, such as D-Link DSL-2640U, as an access point or signal repeater.
Although this model was originally designed for use with ADSL providers, its functionality allows it to be effectively used to expand a wireless network. The key here is proper hardware connection and IP addressing configuration. Connecting via LAN cable ensures stable data transmission, eliminating radio interference typical of purely wireless repeaters.
In this article, we will take a detailed look at the process of transforming your DSL-2640U into a powerful signal booster. You'll learn how to avoid address conflicts and set up a unified, seamless network.
Necessary equipment and preparation
Before you begin software configuration, you need to physically prepare your workspace. You'll need the modem router itself. D-Link DSL-2640U, which will operate in extender mode, and the main router distributing the Internet.
You will also need an Ethernet cable (twisted pair). It's important that the cable is in good condition and long enough to connect the devices at the chosen installation location. Avoid using damaged cables, as this may result in slower speeds or lost data packets.
- 🔌 D-Link DSL-2640U modem (future repeater)
- 📡 A primary router with a working internet connection
- 🔗 Twisted pair cable (patch cord) of any length
- 💻 A computer or laptop for setup
During the preparation phase, it is also recommended to reset the settings DSL-2640U to factory settings, if previously used. This will eliminate any potential conflicts between old configurations and the new operating scheme. To reset, simply hold down the button. Reset on the back panel for 10-15 seconds.
Connection diagram via LAN port
The physical connection between devices is the foundation for the proper operation of the entire network. Unlike configuration via a WAN port, using LAN ports on both devices allows you to create a single local network without creating a subnet (NAT). This is critical for accessing printers, NAS storage, and other devices.
Take the prepared Ethernet cable. Connect one end of it to any available LAN port main router. The other end of the cable must be inserted into LAN port devices D-Link DSL-2640UThe WAN (DSL) port on the secondary router is not used in this scheme.
⚠️ Important: Make sure the cable is securely seated in the port. If the LAN indicator on the router does not light, try replacing the cable or checking the port on the main device.
After connecting with the cable, turn on the power DSL-2640UWait for the router's operating system to load, which will be indicated by the Power and LAN indicators lighting steadily. Now you can move on to the software.
☑️ Check before setup
Setting up the router's IP address
The most important step is changing the secondary router's IP address. By default, DSL-2640U has an address 192.168.1.1If your main router also uses this address (which happens in 90% of cases), a conflict will occur and the network will not work.
Connect your computer to any LAN port DSL-2640UOpen your browser and enter in the address bar 192.168.1.1Enter your login and password (usually admin/admin). Go to the section Network (Network) -> LANHere you need to change the IP address of the device.
The new address must be in the same subnet as the main router, but differ in the last digit. For example, if the main router has the address 192.168.1.1, then ask the secondary one 192.168.1.250This ensures that the addresses do not overlap.
What to do if the main router is in the 192.168.0.x subnet?
If the primary router's address is, for example, 192.168.0.1, then the secondary device should be assigned the address 192.168.0.250. The main rule: the first three digits (octets) must match, and the last one must be unique.
After changing the address, the router will ask you to reboot. Agree. You'll then need to connect to the settings using the new address, for example, 192.168.1.250.
Setting up a wireless WiFi network
To create the effect of a single network (roaming), it is necessary that the network name (SSID) and password on the main router and on DSL-2640U coincide. However, the broadcast channels must be different so as not to interfere with each other.
Go to your wireless network settings Wireless -> BasicIn the field SSID Enter the exact name of your primary network. Please note that the letters are case-sensitive. In the security section Security Set the same encryption type (usually WPA2-PSK) and the same password.
- 📶 Network name (SSID) - identical to the main router
- 🔐 Password - identical to the main router
- 📡 Encryption type: WPA2-PSK (AES)
- 🔢 Channel - select a static channel (1, 6, or 11) other than the main channel
Pay special attention to channel selection. If your main router is broadcasting on channel 1, configure it DSL-2640U on the 6th or 11th. This minimizes signal interference.
Don't forget to save the settings with the button Save/ApplyAfter this, the router may reboot. Check if it's distributing Wi-Fi with the specified name.
Disabling the DHCP server
This is a critical step, without which the network will not function. A local network can only have one "distributor" of IP addresses (DHCP server). This role is performed by the main router. DSL-2640U In repeater/access point mode it should only transmit data and not manage addresses.
Go to settings LAN or DHCP Server. Find the item Enable DHCP Server (Enable DHCP server) and uncheck it (select Disabled or Off). Save the changes.
| Parameter | Main router | DSL-2640U (Repeater) |
|---|---|---|
| IP address | 192.168.1.1 | 192.168.1.250 |
| DHCP Server | Enabled | Disabled |
| SSID (WiFi) | MyHomeWiFi | MyHomeWiFi |
| WiFi channel | 1 | 6 or 11 |
⚠️ Attention: After disabling DHCP on the secondary router, access to its settings is at
192.168.1.250This is only possible if an IP address from the same subnet is manually entered on the computer, or if you are connected to the main router.
The device is now ready for use. Connect the cable from the main router to the LAN port. DSL-2640U (If you haven't already done so). Computers and phones connected to the second router will receive IP addresses from the main device and access the internet.
Checking operation and diagnostics
After completing all the settings, you need to make sure the system is working correctly. Connect your smartphone or laptop to the WiFi network. Walk around your apartment: the device should automatically switch between the main router and DSL-2640U where the main signal becomes weak.
Check the IP address your client received. Go to the website. 2ip.ru or any IP checker. The address should match the external IP of the main provider. If you see an address starting with 192.168... or 10.0... when checking the external IP, it means that NAT is not working correctly, and the LAN/LAN or DHCP settings need to be rechecked.
For diagnostics use the command pingOpen the command prompt on your computer and enter:
ping 192.168.1.1 -tReplace 192.168.1.1 to your main router's address. Run a ping test while standing near the repeater. If the response time (ms) is consistently low and there is no packet loss (0%), then the cable connection between the routers is working properly.
Frequently Asked Questions (FAQ)
Can I use the WAN port on the DSL-2640U to connect to my main router?
Technically, this is possible, but you'll need to configure "Dynamic IP" mode in the WAN section and disable DHCP on the LAN interface. However, the LAN-to-LAN setup described above is considered more stable and appropriate for creating a unified local network, as all devices (printers, media servers) can see each other.
Why doesn't the internet work after connecting the cable?
Most likely, you forgot to disable the DHCP server on DSL-2640U or you entered the IP address incorrectly (address conflict). Also, check if the LAN indicator lights up when the cable is connected.
Will 100 Mbps speed work through this router?
Model DSL-2640U The extender is equipped with Fast Ethernet ports, with a maximum speed limited to 100 Mbps. If your plan is higher, the extender will throttle the speed to that value. Gigabit plans require more modern models with Gigabit Ethernet ports.
Do I need to configure the PPPoE connection type on the repeater?
No, in this scheme (LAN-LAN) DSL-2640U It functions as a switch and access point. All login data (provider login/password) is stored only on the main router.