Configure D-Link DSL-2520U ADSL2+ Ethernet/USB Combo Router/Modem

D-Link DSL-2520U ADSL2+ Ethernet/USB Combo Router is a high-speed ADSL Modem with routing feature. DSL-2520U can support up to 2 Mbps upstream and 24 Mbps downstream. You do not need extra Firewall protection If you are using DSL-2520U ADSL2+ Ethernet/USB Combo Router as ADSL modem. It is because DSL-2520U has its own built-in firewall. Another advantage of using D-Link DSL-2520U is the NAT firewall and SPI support for your network.

Since it is a modem cum router with DHCP feature, you do not need another device to share the Internet connection among multiple computers in your network. You can connect a computer to DSL-2520U ADSL2+ Ethernet/USB Combo Router with Ethernet cable(RJ 45), and USB cable.

Are You Facing Slower Internet With D-link?

Configure D-Link DSL-2520U ADSL2+ Ethernet/USB Combo Router

In order to configure D-Link DSL-2520U in your network, follow the instructions below.
  1. Connect the Phone cable (DSL line) to the WAN/Internet port of D-Link DSL-2520U ADSL2+  as specified by the ISP

  2. Connect D-Link DSL-2520U to Your Computer using an Ethernet cable

  3. Power on the device and type on the address bar of a browser and log in to the web-based setup page using following details.

    Username: admin
    Password: admin

  4. Click on Quick Setup and check the box DSL Auto connect

    Click on Next

  5. Enter the VCI/VPI values provided by your ISP to configure Internet connection on your DSL Modem
    Enter VCI VPI details

    Click Next

  6. Select the connection type as specified by your ISP

  7. Configure D-Link DSL-2520U ADSL2+ Modem in PPPoE

    If your ISP provides username and password to connect to the Internet, you should configure D-Link DSL-2520U ADSL2+ in PPPoE Mode. The advantage of configuring D-Link DSL-2520U ADSL2+ modem is that you can connect multiple computers to this device and share the Internet connection among them. Steps to setup D-Link DSL-2520U ADSL2+ modem in PPPoE mode is provided below.

    1. Select the connection type PPP over Ethernet(PPPoE)

      click on next.

    2. Enter the Username and password provided by your ISP
      configure PPPoE connection with your D Link modem

      click on next

    3. Check Enable NAT and Enable Firewall
      Enable firewall and NAT

      Click Next

    4. You must enable the DHCP server to connect multiple computers to this D-Link Modem. Modem IP address is and Subnet Mask is
      Enable DHCP in Dlink modem

      Starting IP address is and the end IP address is, Subnet Mask is Now click next

    5. Now you are in the summary page.
      reboot Dlink modem

      Click on save, and D-Link modem starts to reboot.

  8. Configure D-Link DSL-2520U ADSL Modem in Bridge Mode

    If your ISP wants your modem configured in bridge mode, you can follow the steps mentioned here to setup D-Link DSL-2520U ADSL2+  in bridge mode. The issue with bridge mode is that you can connect only one computer to the D-Link DSL-2520U ADSL2+ modem and that computer will get the public IP address provided by ISP. Since there is no option to enable DHCP, you cannot use it as a router. You also need to use an external firewall if you are configuring D-Link DSL-2520U ADSL2+ modem in bridge mode because the built-in firewall is disabled in bridge mode.

    1. Select the connection type Bridging
      Connect mode

      click Next

    2. Check Enable Bridge Service
      Enable Bridge service

      Click Next

    3. Enter the modem IP address as and Subnet Mask

      Click Next

    4. Now we are at the final page of bridging D-Link ADSL Modem.

      Click Save. Now Dlink modem starts to reboot

Security Features of D-Link DSL-2520U

D-Link DSL-2520U ADSL2+ Ethernet/USB Combo Router is able to detect common attacks including DOS attack, port scan attack, etc.

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To learn more about DOS attack and how to prevent, click on the link below.
What is DoS Attack and How to Prevent it

If you have configured D-Link DSL-2520U ADSL2+ Ethernet/USB Combo Router in bridge mode, you cannot use the router feature of this device.

  1. Precautions For ROM-0 Router Vulnerability
  2. Setup Linksys WRT54G in PPPoE Mode
  3. Make a Program Starts Automatically When Your Computer Boots

You need an additional router to connect and share the Internet among multiple computers in the network. To configure a D-Link router, visit the link below.
How to Setup D-Link Wireless Router Manually

Post a Comment


  1. Wow beautiful tutorial. Just tell me if I buy this modem, can I use it with BSNL Internet connection ?

  2. Anonymous10:57 AM

    Can I follow the same steps to setup D link modem (this version)with my Asianet broadband connection ?

  3. @Sasi

    You can use D-Link DSL-2520U ADSL2 modem for BSNL DSL connection.
    Connection type = PPPoE
    VPI : 0
    VCI : 35


    You cannot use DSL modem for Asianet Cable broadband. For that you must have a cable modem.

  4. Anonymous3:41 PM

    What is the market price of
    D-Link DSL-2520U ADSL2+ modem?

  5. @Hussein,

    Do you want to disable the routing feature of this model ? All you have to do is to logon to the setup page and disable DHCP function.