Changing the factory password on a Wi-Fi router is the first and most important step an owner should take immediately after purchasing and installing the equipment. Model D-Link DSL-2640UDespite its reliability and popularity in the past, VPNs often come with default access details that are easily found in open sources. If you don't change these settings, your network will remain vulnerable to unauthorized connections, which could lead to traffic theft or even compromise of personal data transmitted over the network.
Changing your security key doesn't require extensive computer networking knowledge, but it does require careful entry of new parameters. In this article, we'll walk you through every step of logging into your device's web interface, navigating the menu, and properly configuring encryption. You'll learn how to do more than just change numbers; you'll also learn how to create a secure perimeter for your home internet connection using the latest security standards.
Please note that firmware interfaces may differ slightly depending on the hardware version (Rev. P1A, U1A, and others) and the year the device was manufactured. Setting interface While the interface may look different, the operating logic remains the same for all modems in this series. We'll cover the universal navigation paths that work for most models of this popular ADSL/VDSL router.
Preparing to change security settings
Before making any changes to your wireless network configuration, ensure the connection between your computer and the router is stable. It's best to configure the settings by connecting to the device. D-Link DSL-2640U through LAN cable, as changing the Wi-Fi password will disconnect your wireless network connection. If a cable connection is not possible, make sure your device (laptop or smartphone) is in a strong signal range.
You will also need your control panel login information. By default, most D-Link models use the login admin and password adminThis information is often found on a sticker located on the bottom of the device. If the default pair doesn't work, the password may have been changed previously, and a reset will require using the reset button. Reset.
⚠️ Note: If you change the password while connected to a Wi-Fi network, you will lose your connection immediately after saving the settings. To continue using the network, you will need to reconnect using the new security key.
To log in, you'll need any modern web browser. Google Chrome, Mozilla Firefox, Opera, or Yandex Browser are all suitable. Make sure your browser doesn't have any proxy servers enabled, which could block access to local addresses, and that your network card is configured to automatically obtain an IP address (IP protocol). TCP/IPv4).
Login to the router's web interface
The first step is to log in to the device's control panel. Open the browser's address bar and enter the router's IP address. For the model DSL-2640U the standard address is 192.168.1.1In some modifications or with changed DHCP settings, the address may differ, for example, 192.168.0.1The exact address can always be found in the documentation or on the same sticker on the bottom of the case.
After navigating to the address, the system will request authorization information. In the window that opens, enter your username and password. As mentioned earlier, this pair is by default admin/adminIf you've previously changed this data and forgotten it, the only solution is to completely reset the device to factory settings using the physical button. Reset, which is located on the rear panel.
In newer firmware versions, the interface may greet you with a pop-up window asking you to change the administrator password for logging in to the system. This administrator password, which protects the settings panel itself, not the Wi-Fi network. It is recommended to set a strong password for this access level as well to prevent unauthorized changes to the router's configuration by hackers.
☑️ Check before entering settings
Navigating the Wi-Fi settings menu
After successful authorization, you will be taken to the main page of the web interface. The D-Link interface can be designed in a classic style with a vertical menu on the left or in a more modern horizontal layout. We are interested in the section responsible for wireless technologies. It may be called Wi-Fi, Wireless or Wireless network.
Within this section, you need to find the subsection responsible for basic settings. It's usually called: Basic settings or Basic SettingsThis is where you'll find the fields for changing the network name (SSID) and selecting the region. Make sure the wireless network function is enabled (checked). Enable Wireless), otherwise after the changes Wi-Fi simply won’t work.
Particular attention should be paid to the field SSID (Service Set Identifier). This is the name of your network that other devices see when searching for available connections. Changing the SSID is a good practice, as the default name (e.g., DIR-320 or DSL-2640U) immediately informs a potential hacker of your router's model and possible vulnerabilities in its firmware.
⚠️ Note: In some firmware versions, settings may be scattered across different tabs. If you don't find the fields you need in "Basic Settings," check the "Security" tab within the Wi-Fi menu.
Some interface versions offer a simplified setup mode via a quick setup wizard (Quick Start). However, to guarantee results and understand exactly what you're changing, it's best to use manual configuration via the advanced menu. This will give you complete control over encryption parameters and the radio module's operating mode.
Selecting an encryption type and creating a strong password
The most important step is setting up security. Go to the subsection Security or Security in the wireless network menu. Here you will see the option Network Authentication (Network Authentication) or Security ModeTo ensure maximum protection, you must select the mode WPA2-PSK or mixed WPA/WPA2-PSKOld protocols WEP And WPA (without the number 2) are considered obsolete and can be easily hacked with special programs in a few minutes.
In the field Pre-Shared Key, WPA Password or Password A new character combination is entered. A strong password should contain at least 8 characters, but 12 or more are better. Use a combination of uppercase and lowercase Latin letters, numbers, and special characters. Avoid obvious sequences such as 12345678 or password.
Encryption AES (Advanced Encryption Standard) is the preferred data encryption algorithm. If the settings allow a choice between TKIP And AES, always choose the last or mode TKIP+AESIf older devices in your home don't support pure AES, consider using mixed modes. However, keep in mind that using mixed modes may slightly reduce data transfer speeds.
Why can't I use Cyrillic in my password?
Some older devices (smartphones, tablets, smart lamps) may incorrectly display or reject passwords containing Russian letters. This is due to differences in encoding. To avoid connection issues with guest devices, use only Latin characters and numbers.
After entering all the parameters, be sure to click the button Apply (Apply) or Save (Save). The router may reboot the wireless module, which will take 10 to 30 seconds. At this point, all connected devices will be disconnected from the network.
Save settings and reboot the device
Changes made in the web interface are first applied to the router's RAM. To ensure that the settings remain intact after power-off, they must be written to the router's RAM. In some firmware versions, On the D-Link DSL-2640U, this happens automatically when you press the Apply button; on others, a separate action is required. Find the button in the menu (often at the top or bottom of the page). Save/Reboot or go to the section System tools -> Save and reload.
Rebooting the device is a critical step. It allows all services to initialize with the new security settings. The process can take up to a minute. The indicators on the front panel of the router will flash erratically and then return to their normal state: the power indicator (Power), ADSL (line) and Wi-Fi indicator.
Once the router has fully booted up, try connecting to your Wi-Fi network from any device. The system will prompt you for a new password. If the connection is successful and the internet is working, you've completed the procedure correctly. If you receive an "Incorrect Password" error, check your keyboard layout and the capitalization of the characters you're entering.
Additional wireless network security measures
Changing your password is a basic, but not the only, step towards security. Model DSL-2640U supports the function MAC filteringThis mechanism allows you to create a whitelist of devices that are allowed to connect to the router, even if they know the password. All other devices whose MAC addresses are not on the list will be denied access.
It is also recommended to disable the function WPS (Wi-Fi Protected Setup). Despite the convenience of connecting with a single click, this protocol has known vulnerabilities that allow Wi-Fi password recovery by brute-forcing the PIN. You can disable WPS in the corresponding section of the wireless network menu by unchecking the box. Enable WPS.
Don't forget to update your router's firmware regularly. The manufacturer may release patches that close security holes. You can check for new firmware on the manufacturer's official website by searching for your model by the revision number (indicated on the sticker, for example, Rev. P1A).
| Parameter | Recommended value | Description |
|---|---|---|
| SSID Broadcast | Enabled (or Disabled for hidden network) | Network name visibility for others |
| Security Mode | WPA2-PSK | The most secure encryption standard |
| Encryption | AES | Data encoding algorithm |
| WPS | Disabled | PIN code guessing protection |
What should I do if I forgot my new Wi-Fi password?
If you set a complex password and forgot it, you won't be able to recover it through the web interface, as it's displayed as asterisks or dots for security reasons. The only solution is to re-enter the router settings via cable (until you've changed the administrator password) and view or change the Wi-Fi password again. If you've also forgotten the administrator password, the only solution is to reset it using the Reset button.
Can the D-Link DSL-2640U router work as a repeater?
Most 2640U series models are classic modem routers and do not support repeater mode (signal booster) out of the box. However, modified firmware versions exist that add this functionality, but their installation requires high skill levels and may void the warranty.
How often should I change my router password?
It's recommended to change your Wi-Fi network password at least once every 3-6 months. You should also change the password immediately if you lose the device you used to access it, or if you suspect unauthorized access (slow speed, blinking lights, and no activity).