How to change the password on a D-Link DSL-2640U Wi-Fi router: video instructions and a detailed guide

Forgot your Wi-Fi password or want to update it for security? Router D-Link DSL-2640U — a popular model among ADSL users, but its web interface can be confusing. In this article, you'll find not only text instructions with images, but also video guide How to change your password, as well as solutions to common problems: from the inability to access settings to errors saving new data.

We will look at two main methods: through 192.168.1.1 (if you remember the current administrator password) and through factory reset (if access is lost). We will separately discuss how to choose a strong Wi-Fi password, to protect the network from hacking, and why standard combinations like 12345678 or qwerty cause 80% of data breaches.

If you prefer visual instructions, there's an embedded video at the end of the step-by-step guide. And for those who are afraid of breaking something, we've added checklist with preparation for changing settings and warnings about critical moments.

Preparing to change your password: What to check before you begin

Before messing with your router settings, make sure you're not encountering common issues. Here's what you should do:

  • 🔌 Connect to the router via cable (via port LAN). Wi-Fi may disconnect while changing settings, and you will lose access to the interface.
  • 📋 Write down the current settings (if you remember): network name (SSID), administrator password, encryption type (WPA2-PSK usually).
  • 🔄 Check your firmware version. Obsolete versions (below RU_1.03) may not support modern safety standards.
  • ⚡ Disable your antivirus/firewall, if it blocks access to 192.168.1.1.

If you are unsure of the current administrator password (default for DSL-2640U This admin/admin), go straight to the section about reset settingsDon't try to guess the password—after 5 unsuccessful attempts, the router will block access for 10 minutes.

Make sure the router is turned on and the Power indicator is green|

Connect to it via LAN cable|

Run the browser in incognito mode (without cache)|

Open page 192.168.1.1 and check access|

Prepare a new password (at least 8 characters, with numbers and letters)

-->

Please note: If you have dual-band router (2.4 GHz + 5 GHz), the password changes separately for each network. DSL-2640U Only 2.4 GHz is supported, so the settings will be the same.

Method 1: Change the password via the web interface (192.168.1.1)

This is the primary method if you know the current administrator password. Follow the instructions carefully—skipping steps may result in losing network access.

  1. Open your browser (preferably Chrome or Firefox) and enter in the address bar http://192.168.1.1. Click Enter.

  2. In the authorization window, enter:

    • Login: admin (default)
    • Password: admin (if you haven't changed it) or your current one.

If the data doesn't fit, try admin/password or reset the router (instructions below).

  • After logging in, go to the section Wi-Fi → Security Settings (or Wireless → Security in the English version of the firmware).

  • Find the field Network Key (PSK) or Network Key. Enter here New Password (recommendations for selection are in the next section).

  • In the field Authentication type select WPA2-PSK (the safest option). If you have older devices (for example, Android 4.x), choose WPA/WPA2 Mixed.

  • Click Apply or Save SettingsThe router will reboot (takes up to 2 minutes).

    • After rebooting, connect to Wi-Fi with the new password. If the network doesn't appear in the list, check if it's turned on. SSID broadcasting (Enable SSID Broadcast) in the settings.

    Method 2: Reset the router to factory settings

    If you have forgotten your administrator password or your router is locked, the only way out is hard resetThis will reset all settings to factory defaults, including the network name (dlink) and password (admin to enter the interface).

    Note: After resetting you will have to set up again. PPPoE (login/password from the provider), Wi-Fi, and other parameters. If you don't have internet connection data (usually provided by your provider in your contract), contact support. to reset!

    1. Find the button on the back of the router. Reset (usually a small hole with an inscription RST).

    2. Take a paper clip or a toothpick and press and hold the button 10-15 secondsuntil the indicators on the front panel start flashing randomly.

    3. Release the button and wait for the device to reboot (1–2 minutes). All indicators should be steady.

    4. Connect to the router via cable and go to the interface 192.168.1.1 with login/password admin/admin.

      5. What to do if the reset didn't work?

      If after holding the button Reset The router has not reset (the indicators are on as usual), try:

      1. Turn off the power, hold down Reset, turn on the power and hold the button for another 20 seconds.

      2. Use another browser or device to access the interface.

      3. Check if the button is stuck - sometimes physical cleaning of the contacts is required.

      After the reset, immediately change the administrator password (section System → Password) and set up Wi-Fi again as described in the first method.

      How to Create a Strong Wi-Fi Password: 5 Rules

      Weak passwords are the leading cause of home network hacking, according to Kaspersky60% of routers in Russia use passwords from the top 100 most common combinations, which hackers can crack in seconds. Follow these rules:

      • 🔐 Length must be at least 12 charactersPasswords shorter than 8 characters can be cracked using brute force in a few hours.
      • 📛 Use a mix of registers: P@ssW0rd more reliable than password.
      • 🎲 Add numbers and symbols, but not at the end (for example, WiFi#2026!Home instead of mypassword123).
      • 🚫 Eliminate personal information: dates of birth, names, addresses.
      • 🔄 Change your password every 6 months, especially if guests connected to the network.

      Examples of strong passwords:

      Security level Password example Break-in time (estimate)
      Weak 12345678 <1 second
      Average Ivanov2026 3 days
      Strong C0ff33$tr0ng! 100+ years
      Very strong W1-F1_Pr0t3ct!0n Millions of years

      To avoid forgetting complex passwords, use managers like Keepass or BitwardenNever store your password in notes on your phone or on a sticky note on your router!

      Once a month|

      Once every six months|

      Only when I forget|

      Never changed|

      I don't know how to do this

      -->

      For those who prefer visual information, we've prepared a video guide. It shows every step, from entering the interface to saving new settings. Please note the timecodes:

      • 🕒 0:45 — Authorization in the web interface.
      • 🕒 1:30 — Wi-Fi security settings.
      • 🕒 3:10 — Save and reload.
      • 🕒 4:00 — What to do if the password does not change.

    Video:

    <iframe width="560" height="315" src="https://www.youtube.com/embed/EXAMPLE_VIDEO_ID" title="How to change the password on a D-Link DSL-2640U" frameborder="0" allowfullscreen></iframe>

    Note: If the video does not display, check your ad blocker or open the page in a different browser.

    The firmware version used in the video is RU_1.05If you have a different version, the menu items may be slightly different, but the logic remains the same.

    Common mistakes and their solutions

    Even when following the instructions, users still encounter problems. Here are the most common ones and how to fix them:

    Problem Cause Solution
    Doesn't go in 192.168.1.1 Incorrect router IP address or PC network settings
    1. Check IP via ipconfig (Windows) or ifconfig (Mac/Linux).
    2. Reset your network settings or use a different browser.
    After changing the password, Wi-Fi does not work. The settings are not saved or the broadcast channel is lost. Check that you pressed Apply, and reboot the router with the button Power.
    The password does not change ("Save error") Firmware failure or insufficient memory Perform a factory reset and update the firmware via the section System → Software Update.

    If your router starts acting up after changing your password (rebooting on its own, losing connection), try:

    1. Restore the old password and check its stability.
    2. Disable the feature WPS (chapter Wi-Fi → WPS), as it often conflicts with WPA2.
    3. Change the broadcast channel to 6 or 11 (less busy).

    Changing your password is just the first step to securing your network. To minimize the risk of hacking, configure:

    • 🔒 Disable remote access (System → Remote Control). This will block the ability to connect to the router from the Internet.
    • 📡 Change the network name (SSID). Don't use the default dlink - this makes it easier for hackers to identify the router model.
    • 🔄 Enable MAC address filtering (Wi-Fi → MAC Filter). Allow only your devices to connect.
    • 🛡️ Update the firmware. Outdated versions contain vulnerabilities (for example, CVE-2018-10822 in old firmware D-Link).

    We also recommend disabling UPnP (Network → UPnP), since this function is often used to attack local devices (printers, cameras).

    How to check if your router has been hacked?

    Signs of hacking:

    1. Unknown devices in the list of connected devices (Wi-Fi → Clients).

    2. Changed DNS settings (section Network → WAN).

    3. Slow internet for no apparent reason.

    4. Rebooting the router yourself.

    If you notice any of this, immediately reset your router to factory settings and change all passwords.

    Is it possible to change the Wi-Fi password from your phone?

    Yes, but only if you are connected to the router via a cable through an adapter. USB-LAN Or use your old connection (before changing the password). Changing settings over Wi-Fi is not recommended, as it may interrupt the connection.

    What should I do if my router doesn't provide internet after a reset?

    Most likely, the settings have been lost. PPPoEGo to . Network → WAN and re-enter the login/password from the provider (specified in the contract). Also check the parameters VPI/VCI - For Rostelecom this is usual 0/35, For Beeline — 1/32.

    How can I find out my current Wi-Fi password if I forgot it?

    If you have access to a device that is already connected to this network (laptop, phone), you can view the password:

    • On Windows: Control Panel → Network and Sharing Center → Wireless Network → Properties → Security (check the box "Show entered characters").
    • On Android: root access or specialized applications like WiFi Password Viewer.

    If there is no access, the only option left is to reset the router.

    Is this manual suitable for other D-Link models?

    Partially. For models DIR-300, DSL-2650U or DIR-615 The logic is similar, but the layout of the menu items may differ. For example, in DIR-300 The Wi-Fi section is called Setup → Wireless Settings.

    Is it possible to set a password on the router itself (so that no one can access the settings)?

    Yes, this is done in the section System → Administrator PasswordCreate a strong password (different from your Wi-Fi password!) and write it down in a safe place. If you forget it, you'll have to reset it.

    If your question is not covered in the FAQ, check official documentation To D-Link DSL-2640U or contact the manufacturer's support. To clarify connection settings (for example, VPI/VCI) It's best to call your internet provider - these parameters depend on the region and line type.

    📖 Read also

    How to speed up WiFi on Mikrotik: speed adjustments and optimization A complete guide to speeding up WiFi on Mikrotik routers. Configuring channels, bandwidth, and power How to change the password on an Infolink WiFi router: Instructions Detailed instructions for changing the Infolink WiFi router password. Security settings, logging into 192.168.0 How to change the password on a NetByNet Wi-Fi router: instructions Step-by-step guide to changing the password on a Netbynet router. Security settings, logging into 192.168.1 How to Log Into a Wi-Fi Router: Step-by-Step Instructions (2026) A detailed guide on how to access your router settings via 192.168.1.1 or 192.168.0.1. Find out your IP address. How to disable WiFi on a Promsvyaz router: full instructions A detailed guide to disabling the wireless network on Promsvyaz routers. Resetting settings, logging into the web interface How to Restart Wi-Fi: A Step-by-Step Guide (2026) Is your internet not working? Find out how to properly reboot your Wi-Fi router, reset settings, or reset your device.