D-Link DSL-2520U User manual

Table of Content
D-Link DSL-2520U User Manual 1
Table of Contents
PACKAGE CONTENTS .....................................................................................................2
SYSTEM REQUIREMENTS................................................................................................3
FEATURES ......................................................................................................................5
HARDWARE OVERVIEW .................................................................................................6
Connections ...........................................................................6
LEDs........................................................................................7
INSTALLATION..............................................................................8
BEFORE YOU BEGIN .....................................................................................................8
INSTALLATION NOTES...................................................................................................9
INFORMATION YOU WILL NEED FROM YOUR ADSL SERVICE PROVIDER....................11
INFORMATION YOU WILL NEED ABOUT DSL-2520U..................................................13
DEVICE INSTALLATION................................................................................................15
POWER ON ROUTER....................................................................................................15
NETWORK CONNECTIONS...........................................................................................16
CONFIGURATION........................................................................18
WEB-BASED CONFIGURATION UTILITY ......................................................................18
SETUP.......................................................................................................................19
WIZARD.................................................................................19
ADSL SETUP.........................................................................22
ADVANCED ..............................................................................................................30
PORT FORWARDING............................................................30
QOS SETUP..........................................................................32
OUTBOUND FILTER .............................................................34
INBOUND FILTER .................................................................35
DNS SETUP...........................................................................36
VLAN......................................................................................38
FIREWALL & DMZ.................................................................40
ADVANCED ADSL .................................................................41
ADVANCED LAN ...................................................................42
REMOTE MANAGEMENT.....................................................43
TR-069...................................................................................45
MAINTENANCE.......................................................................................................46
PASSWORD..........................................................................46
SAVE/RESTORE SETTINGS................................................47
FIRMWARE UPDATE............................................................48
SYSTEM LOG.......................................................................50
STATUS......................................................................................................................51
DEVICE INFO........................................................................51
CONNECTED CLIENTS........................................................53
STATISTICS ..........................................................................54
TROUBLESHOOTING.................................................................56
NETWORKING BASICS ..............................................................58
CHECK YOUR IP ADDRESS............................................................................................58
STATICALLY ASSIGN AN IP ADDRESS...........................................................................59
TECHNICAL SPECIFICATIONS ..................................................60

Section 1 - Product Overview
D-Link DSL-2520U User Manual 2
Package Contents
DSL-2520U ADSL Router
Power Adapter
One twisted-pair telephone cable used forADSL connection
One straight-through Ethernet cable
One USB cable
One Splitter
One CD
Note: Using a power supply with a different voltage rating than the one included with the DSL-2520U will cause damage and void the warranty for this product.

Section 1 - Product Overview
D-Link DSL-2520U User Manual 3
System Requirements
ADSL Internet service
Computer with:
200MHz Processor
64MB Memory
CD-ROM Drive
Ethernet Adapter with TCP/IP Protocol Installed
USB Port
Windows win7/vista/XP/2000
MAC OS
Internet Explorer v6 or later, FireFox v1.5
D-Link Click's Connect Utility
Computer with Windows 2000/XP

Section 1 - Product Overview
D-Link DSL-2520U User Manual 4
Introduction
HIGH-SPEED ADSL2/2+ INTERNET CONNECTION
Latest ADSL2/2+ standards provide Internet transmission of up to 24Mbps downstream, 1Mbps upstream.
TOTAL SECURITY
Firewall protection from Internet attacks, user access control.
ULTIMATE INTERNET CONNECTION
The DSL-2520U ADSL2+ router is a versatile, high-performance remote router for home and the small office. With integratedADSL2/2+ supporting up to 24Mbps
download speed, firewall protection, Quality of Service (QoS), this router provides all the functions that a home or small office needs to establish a secure and
high-speed remote link to the outside world.
FIREWALL PROTECTION & QoS
Security features prevents unauthorized access to the home and office network, be it from the LAN devices or from the Internet. The router provides firewall
security using Stateful Packet Inspection (SPI) and hacker attack logging for Denial of Service (DoS) attack protection. SPI inspects the contents of all incoming
packet headers before deciding what packets are allowed to pass through. Router access control is provided with packet filtering based on port and
source/destination IP addresses. For Quality of Service (QoS), the router supports multiple priority queues to enable a group of home or office users to
experience the benefit of smooth network connection of inbound and outbound data without concern of traffic congestion. This QoS support allows users to enjoy
high ADSL transmission for applications such as VoIP and streaming multimedia over the Internet.

Section 1 - Product Overview
D-Link DSL-2520U User Manual 5
Features
DHCP Support - Dynamic Host Configuration Protocol automatically and dynamically assigns all LAN IP settings to each host on your
network. This eliminates the need to reconfigure every host whenever changes in network topology occur.
Network Address Translation (NAT) - For small office environments, the DSL-2520U allows multiple users on the LAN to access the
Internet concurrently through a single Internet account. This provides Internet access to everyone in the office for the price of a single user.
NAT improves network security in effect by hiding the private network behind one global and visible IP address. NAT address mapping can
also be used to link two IP domains via a LAN-to-LAN connection.
Precise ATM Traffic Shaping - Traffic shaping is a method of controlling the flow rate ofATM data cells. This function helps to establish the
Quality of Service for ATM data transfer.
High Performance - Very high rates of data transfer are possible with the Router. Up to 24Mbps downstream bit rate using the G.dmt
standard. (For ADSL2+)
Full Network Management - The DSL-2520U incorporates network management for web-based management and text-based network
management via Telnet connection.
Easy Installation - The DSL-2520U uses a web-based graphical user interface program for convenient management access and easy set
up. Any common web browser software can be used to manage the Router.

Section 1 - Product Overview
D-Link DSL-2520U User Manual 6
Hardware Overview
Connections
Power insert
Use the adapter shipped with the
Router to connect to power
source
Power button
Push in to power-on the Router.
Push again to power-off the
Router
Ethernet ports
Use the Ethernet ports to connect
the Router to your Ethernet LAN
or Ethernet devices
ADSL port
Use the ADSL cable to connect
to the your telephone line (RJ-11
port)
Reset button
To manually reset, depress
button with the power on for
between ten and fifteen seconds
USB ports
Use the USB ports to connect the
Router to your USB devices

Section 1 - Product Overview
D-Link DSL-2520U User Manual 7
Hardware Overview
LEDs
Power
Steady green light indicates the
unit is powered on. When the
device is powered off this
remains dark.
DSL
Steady green light indicates a
valid ADSL connection. This
will light after the ADSL
negotiation process has been
settled. A blinking green light
indicates activity on the WAN
(ADSL) interface.
LAN
A solid green light indicates a
valid link on startup. These
lights blink when there is
activity currently passing
through the Ethernet port.
Internet
Steady green light indicates a
successful Internet connection.
Steady red light indicates failed
Internet connection. Dark if no
WAN protocol is configured.
USB
A solid green light indicates a
valid link on startup. These
lights blink when there is
activity currently passing
through the USB port.

Section 2 - Installation
D-Link DSL-2520U User Manual 8
Installation
This section will walk you through the installation process. Placement of the router is very important. Do not place the router in an enclosed area
such as a closet, cabinet, or in the attic or garage.
Before you Begin
Please read and make sure you understand all the prerequisites for proper installation of your new Router. Have all the necessary information and
equipment on hand before beginning the installation.

Section 2 - Installation
D-Link DSL-2520U User Manual 9
Installation Notes
In order to establish a connection to the Internet it will be necessary to provide information to the Router that will be stored in its memory. For some
users, only their account information (Username and Password) is required. For others, various parameters that control and define the Internet
connection will be required. You can print out the two pages below and use the tables to list this information. This way you have a hard copy of all
the information needed to setup the Router. If it is necessary to reconfigure the device, all the necessary information can be easily accessed. Be
sure to keep this information safe and private.
Low Pass Filters
Since ADSL and telephone services share the same copper wiring to carry their respective signals, a filtering mechanism may be necessary to
avoid mutual interference. A low pass filter device can be installed for each telephone that shares the line with theADSL line. These filters are easy
to install passive devices that connect to theADSL device and/or telephone using standard telephone cable. Ask your service provider for more
information about the use of low pass filters with your installation.
Operating Systems
The DSL-2520U uses an HTML-based web interface for setup and management. The web configuration manager may be accessed using any
operating system capable of running web browser software, including Windows 2000, Windows XP, Windows Vista, Windows 7 and MAC OS.
Web Browser
Any common web browser can be used to configure the Router using the web configuration management software. The program is designed to
work best with more recently released browsers such as Opera, Microsoft Internet Explorer® version 6.0, Netscape Navigator® version 6.2.3, or
later versions. The web browser must have JavaScript enabled. JavaScript is enabled by default on many browsers. Make sure JavaScript has not
been disabled by other software (such as virus protection or web user security packages) that may be running on your computer.
Ethernet Port (NIC Adapter) and USB Port
Any computer that uses the Router must be able to connect to it through the Ethernet port or the USB Port on the Router. These connections are
Ethernet connection and USB device connection and therefore require that your computer be equipped with an Ethernet port or USB Port as well.
Most notebook computers are now sold with an Ethernet port and a USB Port already installed. Likewise, most fully assembled desktop computers
come with an Ethernet NIC adapter and USB port as standard equipment. If your computer does not have an Ethernet port or a USB Port, you must
install an Ethernet NIC adapter or USB driver before you can use the Router. If you must install an adapter, follow the installation instructions that
come with the Ethernet NIC adapter.

Section 2 - Installation
D-Link DSL-2520U User Manual 10
Additional Software
It may be necessary to install software on your computer that enables the computer to access the Internet. Additional software must be installed if
you are using the device a simple bridge. For a bridged connection, the information needed to make and maintain the Internet connection is stored
on another computer or gateway device, not in the Router itself.
If your ADSL service is delivered through a PPPoE or PPPoA connection, the information needed to establish and maintain the Internet connection
can be stored in the Router. In this case, it is not necessary to install software on your computer. It may however be necessary to change some
settings in the device, including account information used to identify and verify the connection.
All connections to the Internet require a unique global IP address. For bridged connections, the global IP settings must reside in a TCP/IP enabled
device on the LAN side of the bridge, such as a PC, a server, a gateway device such as a router or similar firewall hardware. The IP address can be
assigned in a number of ways. Your network service provider will give you instructions about any additional connection software or NIC
configuration that may be required.

Section 2 - Installation
D-Link DSL-2520U User Manual 11
Information you will need from your ADSL service
provider
Username
This is the Username used to log on to your ADSL service provider’s network. It is commonly in the form [email protected]. Your ADSL service
provider uses this to identify your account.
Password
This is the Password used, in conjunction with the Username above, to log on to your ADSL service provider’s network. This is used to verify the
identity of your account.
WAN Setting / Connection Type
These settings describe the method your ADSL service provider uses to transport data between the Internet and your computer. Most users will use
the default settings. You may need to specify one of the following WAN Setting and Connection Type configurations (Connection Type settings listed
in parenthesis):
PPPoE/PPoA (PPPoE LLC, PPPoE VC-Mux, PPPoA LLC or PPPoA VC-Mux)
Bridge Mode (1483 Bridged IP LLC or 1483 Bridged IP VC Mux)
MER (Static IP Address)/IPoA (1483 Bridged IP LLC, 1483 Bridged IP VC Mux, 1483 Routed IP LLC or 1483 Routed IP VC-Mux)
MER (Dynamic IPAddress) (1483 Bridged IP LLC or 1483 Bridged IP VC-Mux)
Modulation Type
ADSL uses various standardized modulation techniques to transmit data over the allotted signal frequencies. Some users may need to change the
type of modulation used for their service. The default DSL modulation (ADSL2+ Multi-Mode) used for the Router automatically detects all types of
ADSL, ADSL2, and ADSL2+ modulation. However, if you are instructed to specify the modulation type used for the Router, you may choose among
the numerous options available on the Modulation Type drop-down list on the ADSL Configuration window (Advanced > ADSL)
Security Protocol
This is the method your ADSL service provider will use to verify your Username and Password when you log on to their network. Your Router
supports the PAP and CHAP protocols.

Section 2 - Installation
D-Link DSL-2520U User Manual 12
VPI
Most users will not be required to change this setting. The Virtual Path Identifier (VPI) is used in conjunction with the Virtual Channel Identifier (VCI)
to identify the data path between your ADSL service provider’s network and your computer. If you are setting up the Router for multiple virtual
connections, you will need to configure the VPI and VCI as instructed by your ADSLservice provider for the additional connections. This setting can
be changed in the WAN Settings window of the web management interface.
VCI
Most users will not be required to change this setting. The Virtual Channel Identifier (VCI) used in conjunction with the VPI to identify the data path
between your ADSL service provider’s network and your computer. If you are setting up the Router for multiple virtual connections, you will need to
configure the VPI and VCI as instructed by your ADSL service provider for the additional connections. This setting can be changed in the WAN
Settings window of the web management interface.

Section 2 - Installation
D-Link DSL-2520U User Manual 13
Information you will need about DSL-2520U
Username
This is the Username needed access the Router’s management interface. When you attempt to connect to the device through a web browser you
will be prompted to enter this Username. The default Username for the Router is “admin.” The user cannot change this.
Password
This is the Password you will be prompted to enter when you access the Router’s management interface. The default Password is “admin.” The
user may change this.
LAN IP addresses for the DSL-2520U
This is the IP address you will enter into theAddress field of your web browser to access the Router’s configuration graphical user interface (GUI)
using a web browser. The default IP address is 192.168.1.1. This may be changed to suit any IP address scheme the user desires. This address will
be the base IP address used for DHCP service on the LAN when DHCP is enabled.
LAN Subnet Mask for the DSL-2520U
This is the subnet mask used by the DSL-2520U, and will be used throughout your LAN. The default subnet mask is 255.255.255.0. This can be
changed later.

Section 2 - Installation
D-Link DSL-2520U User Manual 14
Information you will need about your LAN or computer:
Ethernet NIC
If your computer has an Ethernet NIC, you can connect the DSL-2520U to this Ethernet port using an Ethernet cable. You can also use the Ethernet
ports on the DSL-2520U to connect to other computer or Ethernet devices.
USB port
If your computer has an USB port, you can connect the DSL-2520U to this USB port using an USB cable.
DHCP Client status
Your DSL-2520UADSL Router is configured, by default, to be a DHCP server. This means that it can assign an IP address, subnet mask, and a
default gateway address to computers on your LAN. The default range of IP addresses the DSL-2520 will assign are from 192.168.1.2 to
192.168.1.33. Your computer (or computers) needs to be configured to Obtain an IP address automatically (that is, they need to be configured as
DHCP clients.)
It is recommended that your collect and record this information here, or in some other secure place, in case you have to re-configure your ADSL
connection in the future.
Once you have the above information, you are ready to setup and configure your DSL-2520U ADSL Router.

Section 2 - Installation
D-Link DSL-2520U User Manual 15
Device Installation
The DSL-2520U ADSL Router maintains three separate interfaces, an Ethernet LAN ,an USB interface and an ADSL Internet (WAN) connection.
Carefully consider the Router’s location suitable for connectivity for your Ethernet devices. You must have a functioning broadband connection via a
bridge device such as a Cable or ADSL modem in order to use the Router’s WAN function.
Place the Router in a location where it can be connected to the various devices as well as to a power source. The Router should not be located
where it will be exposed to moisture, direct sunlight or excessive heat. Make sure the cables and power cord are placed safely out of the way so
they do not create a tripping hazard. As with any electrical appliance, observe common sense safety procedures.
The Router can be placed on a shelf, desktop, or other stable platform. If possible, you should be able to see the LED indicators on the front if you
need to view them for troubleshooting.
Power on Router
The Router must be used with the power adapter included with the device.
1. Insert the AC Power Adapter cord into the power receptacle located on the rear panel of the Router and plug the adapter into a suitable nearby
power source.
2. Push down the Power button, and you should see the Power LED indicator light up and remain lit.
3. If the Ethernet port is connected to a working device, check the Ethernet Link/Act LED indicators to make sure the connection is valid. The
Router will attempt to establish the ADSL connection, if the ADSL line is connected and the Router is properly configured this should light up
after several seconds. If this is the first time installing the device, some settings may need to be changed before the Router can establish a
connection.

Section 2 - Installation
D-Link DSL-2520U User Manual 16
Factory Reset Button
The Router may be reset to the original factory default settings by using a ballpoint or paperclip to gently push down the reset button in the following
sequence:
1. Press and hold the reset button while the device is powered off.
2. Turn on the power.
3. Wait for 10~15 seconds and then release the reset button.
Remember that this will wipe out any settings stored in flash memory including user account information and LAN IP settings. The device settings
will be restored to the factory default IP address 192.168.1.1 and the subnet mask is 255.255.255.0, the default management Username is “admin”
and the default Password is “admin.”
Network Connections
Connect ADSL Line
Use the ADSL cable included with the Router to connect it to a telephone wall socket or receptacle. Plug one end of the cable into theADSL port
(RJ-11 receptacle) on the rear panel of the Router and insert the other end into the RJ-11 wall socket. If you are using a low pass filter device, follow
the instructions included with the device or given to you by your service provider. The ADSL connection represents the WAN interface, the
connection to the Internet. It is the physical link to the service provider’s network backbone and ultimately to the Internet.
Connect Router to Ethernet
The Router may be connected to a single computer or Ethernet device through the 10/100BASE-TX Ethernet port on the rear panel. Any connection
to an Ethernet concentrating device such as a switch or hub must operate at a speed of 10/100 Mbps only. When connecting the Router to any
Ethernet device that is capable of operating at speeds higher than 10Mbps, be sure that the device has auto-negotiation (NWay) enabled for the
connecting port. Use standard twisted-pair cable with RJ-45 connectors. The RJ-45 port on the Router is a crossed port (MDI-X). Follow standard
Ethernet guidelines when deciding what type of cable to use to make this connection. When connecting the Router directly to a PC or server use a
normal straight-through cable. You should use a crossed cable when connecting the Router to a normal (MDI-X) port on a switch or hub. Use a
normal straight-through cable when connecting it to an uplink (MDI-II) port on a hub or switch. The rules governing Ethernet cable lengths apply to
the LAN to Router connection. Be sure that the cable connecting the LAN to the Router does not exceed 100 meters.

Section 2 - Installation
D-Link DSL-2520U User Manual 17
Hub or Switch to Router Connection
Connect the Router to an uplink port (MDI-II) on an Ethernet hub or switch with
a straight-through cable as shown in this diagram. If you wish to reserve the
uplink port on the switch or hub for another device, connect to any on the other
MDI-X ports (1x, 2x, etc.) with a crossed cable.
Computer to Router Connection
You can connect the Router directly to a 10/100BASE-TX Ethernet adapter
card (NIC) installed on a PC using the Ethernet cable provided as shown in this
diagram.

Section 3 - Configuration
D-Link DSL-2520U User Manual 18
Configuration
This section will show you how to configure your new D-Link ADSL router using the web-based configuration utility.
Web-based Configuration Utility
Connect to the Router
To configure the WAN connection used by the Router it is first necessary to communicate with the Router through its management interface, which
is HTML-based and can be accessed using a web browser. The easiest way to make sure your computer has the correct IP settings is to configure
it to use the DHCP server in the Router.
To access the configuration utility, open a web-browser such as Internet Explorer and enter the IP
address of the router (192.168.1.1).
Type “admin” for the User Name and “admin” in the Password field. If you get a Page Cannot be
Displayed error, please refer to the Troubleshooting section for assistance.

Section 3 - Configuration
D-Link DSL-2520U User Manual 19
SETUP
This chapter is concerned with using your computer to configure the WAN connection. The following chapter describes the various windows used to
configure and monitor the Router including how to change IP settings and DHCP server setup.
WIZARD
ADSL SETUP
Click on the Setup Wizard button to launch the Setup Wizard.
WELCOME TO D-LINK SETUP WIZARD
There are four steps to configuring your router. Click on the Next button to
continue.

Section 3 - Configuration
D-Link DSL-2520U User Manual 20
STEP 1: CHANGE YOUR DSL-2520U PASSWORD
The default password is "admin", in order to secure your network, please
modify the password. Note: Confirm Password must be same as "New
Password". Of course, you can click on the Skip to ignore the step.
STEP 2: SELECT INTERNET CONNECTION TYPE
Please select your Country and ISP. The
VPI and VCI information Will display Automatically. Of course, you can
modify the information.
If, you can not find the country and ISP in the list below; you can select
"Others", and then input the "VPI" and "VCI” and Connection Type.
Click on the Next button to go to the next Setup Wizard window.