D-Link DSL-6740U User manual

Table of Content
D-Link DSL-6740U User Manual
1
Table of Contents
PRODUCT OVERVIEW.......................................................................... 2
P ACKAGE C ONTENTS ............................................................................ 2
S YSTEM R EQUIREMENTS ....................................................................... 2
I NTRODUCTION ..................................................................................... 3
F EATURES ............................................................................................ 4
H ARDWARE O VERVIEW ......................................................................... 5
Connections .................................................................................. 5
LEDs............................................................................................... 6
INSTALLATION...................................................................................... 7
B EFORE YOU B EGIN .............................................................................. 7
I NSTALLATION N OTES ........................................................................... 8
I NFORMATION YOU WILL NEED FROM YOUR VDSL SERVICE PROVIDER ... 10
I NFORMATION YOU WILL NEED ABOUT DSL-6740U............................... 12
W IRELESS I NSTALLATION C ONSIDERATIONS ........................................ 14
D EVICE I NSTALLATION ........................................................................ 15
P OWER ON R OUTER ............................................................................ 15
N ETWORK C ONNECTIONS .................................................................... 16
CONFIGURATION................................................................................ 18
W EB - BASED C ONFIGURATION U TILITY ................................................. 18
SETUP.............................................................................................. 19
WIZARD........................................................................................ 19
INTERNET SETUP ....................................................................... 28
WIRELESS.................................................................................... 37
ADVANCED...................................................................................... 50
PORT FORWARDING................................................................... 54
PORT TRIGGERING..................................................................... 56
DMZ.............................................................................................. 58
PARENTAL CONTROL.................................................................. 59
FILTERING OPTION..................................................................... 62
FIREWALL.................................................................................... 66
DNS .............................................................................................. 67
Dynamic DNS................................................................................ 68
NETWORK TOOL..........................................................................70
ROUTING ......................................................................................77
SCHEDULES.................................................................................79
TR-069...........................................................................................81
Print Server....................................................................................82
MAINTENANCE.................................................................................84
SYSTEM........................................................................................84
FIRMWARE UPDATE.....................................................................86
ACCESS CONTROL......................................................................87
DIAGNOSTICS..............................................................................90
SYSTEM LOG................................................................................91
STATUS.............................................................................................93
DEVICE INFO................................................................................93
WIRELESS CLIENTS.....................................................................95
DHCP CLIENTS.............................................................................96
LOG...............................................................................................97
STATISTICS...................................................................................98
ROUTE INFO...............................................................................100
TROUBLESHOOTING ........................................................................101
WIRELESS BASICS............................................................................103
NETWORKING BASICS......................................................................106
C HECK YOUR IP ADDRESS ..................................................................106
S TATICALLY A SSIGN AN IP ADDRESS ...................................................107
TECHNICAL SPECIFICATIONS..........................................................108
CONTACTING TECHNICAL SUPPORT..............................................109

Section 1 - Product Overview
D-Link DSL-6740U User Manual
2
ProductOv erview
Package Contents
•DSL-6740U Wireless VDSL Router
•2 Non-Detachable Antenna
•Power Adapter
•CD-ROM with Installation Wizard, User Manual, and Special Offers
•One twisted-pair telephone cable used for VDSL connection
•One straight-through Ethernet cable
•One Quick Installation Guide
Note: Using a power supply with a different voltage rating than the one included
with the DSL-6740U will cause damage and void the warranty for this product.
System Requirements
•VDSL Internet service
•Computer with:
•200MHz Processor
•64MB Memory
•CD-ROM Drive
•Ethernet Adapter with TCP/IP Protocol Installed
•Windows XP/2000/vista
•Internet Explorer v6 or later, FireFox v1.5
•D-Link Click'n Connect Utility
•Computer with Windows 2000/XP/Vista

Section 1 - Product Overview
D-Link DSL-6740U User Manual
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11
Introduction
HIGH-SPEED VDSL2 INTERNET CONNECTION
Latest VDSL2 standards provide Internet transmission of up to 100Mbps downstream, 50Mbps upstream.
HIGH-PERFORMANCE WIRELESS
Embedded 802.11n technology for high-speed wireless connection, complete compatibility with 802.11b/g wireless devices
TOTAL SECURITY
Firewall protection from Internet attacks, user access control, WPA/WPA2 wireless security.
ULTIMATE INTERNET CONNECTION
The DSL-6740U VDSL2 router is a versatile, high-performance remote router for home and the small office. With integrated VDSL2/ADSL2+ supporting up to
100Mbps download speed, firewall protection, Quality of Service (QoS), 802.11b/g wireless LAN and 4 Ethernet switch ports, 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.
ULTIMATE WIRELESS CONNECTION WITH MAXIMUM SECURITY
This router provides maximize wireless performance by connecting this router to computer interfaces and stay connected from virtually anywhere at home and in
the office. The router can be used with 802.11b/g/n wireless networks to enable significantly improved reception. It supports WPA/WPA2 and WEP for flexible
user access security and data encryption methods.
FIREWALL PROTECTION & QoS
Security features prevents unauthorized access to the home and office network, be it from the wireless 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 MAC/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 VDSL2 transmission for applications such as VoIP and streaming multimedia over the Internet.
* Maximum wireless signal rate derived from IEEE standard 802.11n specifications. Actual data throughput will vary. Network conditions and environmental factors, including volume of network
traffic, building materials and construction, and network overhead, lower actual data throughput rate. Environmental factors will adversely affect wireless signal range.

Section 1 - Product Overview
D-Link DSL-6740U User Manual
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Features
•Faster Wireless Networking - The DSL-6740U provides up to 270Mbps* wireless connection with other 802.11n wireless clients. This
capability allows users to participate in real-time activities online, such as video streaming, online gaming, and real-time audio.
•Compatible with 802.11b Devices - The DSL-6740U is still fully compatible with the IEEE 802.11b standards, so it can connect with existing
802.11b PCI, USB and Cardbus adapters.
•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-6740U 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 of ATM 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 100Mbps downstream bit rate using the VDSL2
standard
•Full Network Management - The DSL-6740U incorporates SNMP (Simple Network Management Protocol) support for web-based
management and text-based network management via Telnet connection.
•Easy Installation - The DSL-6740U 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.
* Maximum wireless signal rate derived from IEEE standard 802.11n specifications. Actual data throughput will vary. Network conditions and environmental factors, including volume of network
traffic, building materials and construction, and network overhead, lower actual data throughput rate. Environmental factors will adversely affect wireless signal range.

Section 1 - Product Overview
D-Link DSL-6740U User Manual
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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
Et
hernet ports
Use the Ethernet ports to connect
the Router to your Ethernet LAN
or Ethernet devices
V
DSL port
Use the VDSL 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
Wireless On/Off switch
For wireless operation on or
off.

Section 1 - Product Overview
D-Link DSL-6740U User Manual
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Hardware Overview
LEDs
Power
Steady green light
indicates the unit is
powered on. When the
device is powered off this
remains dark.
WLAN
Steady green light
indicates a wireless
connection. A blinking
green light indicates
activity on the WLAN
DSL
Steady green light indicates a
valid VDSL connection. This will
light after the VDSL negotiation
process has been settled. A
blinking green light indicates
activity on the WAN (VDSL)
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.

Section 2 - Installation
D-Link DSL-6740U User Manual
7
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-6740U User Manual
8
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 VDSL 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 the VDSL line. These filters are easy
to install passive devices that connect to the VDSL 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-6740U 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 98 SE, Windows ME, Windows 2000, Windows XP and Vista.
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)
Any computer that uses the Router must be able to connect to it through the Ethernet port on the Router. This connection is an Ethernet connection
and therefore requires that your computer be equipped with an Ethernet port as well. Most notebook computers are now sold with an Ethernet port
already installed. Likewise, most fully assembled desktop computers come with an Ethernet NIC adapter as standard equipment. If your computer
does not have an Ethernet port, you must install an Ethernet NIC adapter 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-6740U User Manual
9
802.11 Wireless LAN Configuration
All the 802.11 wireless LAN settings may be configured on a single page using the web-based manager. For basic wireless communication you
need to decide what channel to use and what SSID to assign. These two settings must be the same for any wireless workstations or other wireless
access point that communicate with the DSL-6740U through the wireless interface.
Security for wireless communication can be accomplished in a number of ways. The DSL-6740U supports WPA (Wi-Fi Protected Access), WPA2,
and mixed WPA/WPA2. Wireless access can also be controlled by selecting MAC addresses that are allowed to associate with the device. Please
read the section on Wireless Configuration.
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 VDSL 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-6740U User Manual 10
Information you will need from your VDSL service
provider
Username
This is the Username used to log on to your VDSL service provider’s network. It is commonly in the form [email protected]. Your VDSL 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 VDSL service provider’s network. This is used to verify the
identity of your account.
WAN Setting / Connection Type
These settings describe the method your VDSL 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, PPPoA LLC or PPPoA VC-Mux)
•Bridge Mode (1483 Bridged IP LLC or 1483 Bridged IP VC Mux)
•IPoA/MER (Static IPAddress) (Bridged IP LLC, 1483 Bridged IP VC Mux, 1483 Routed IP LLC, 1483 Routed IP VC-Mux or IPoA)
•MER (Dynamic IP Address) (1483 Bridged IP LLC or 1483 Bridged IP VC-Mux)
Modulation Type
VDSL 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 used for the Router automatically detects all types of ADSL2, ADSL2+,
VDSL2 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 menu on the DSL Configuration window (Advanced > Network Tools >DSL)
Security Protocol
This is the method your VDSL 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.

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D-Link DSL-6740U User Manual 11
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 yourADSL 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 VDSLservice 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 VDSL 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 VDSL 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-6740U User Manual 12
Information you will need about DSL-6740U
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-6740U
This is the IP address you will enter into the Address 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-6740U
This is the subnet mask used by the DSL-6740U, 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-6740U User Manual 13
Information you will need about your LAN or computer :
Ethernet NIC
If your computer has an Ethernet NIC, you can connect the DSL-6740U to this Ethernet port using an Ethernet cable. You can also use the Ethernet
ports on the DSL-6740U to connect to other computer or Ethernet devices.
DHCP Client status
Your DSL-6740U VDSL 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-6740U will assign are from 192.168.1.2 to
192.168.1.254. 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 VDSL
connection in the future.
Once you have the above information, you are ready to setup and configure your DSL-6740U Wireless VDSL Router.

Section 2 - Installation
D-Link DSL-6740U User Manual 14
Wireless Installation Considerations
DSL-6740U lets you access your network using a wireless connection from virtually anywhere within the operating range of your wireless network.
Keep in mind, however, that the number, thickness and location of walls, ceilings, or other objects that the wireless signals must pass through, may
limit the range. Typical ranges vary depending on the types of materials and background RF (radio frequency) noise in your home or business. The
key to maximizing wireless range is to follow these basic guidelines:
1.
1.1.
1. Keep the number of walls and ceilings between the D-Link router and other network devices to a minimum - each wall or ceiling can reduce your
adapter’s range from 3-90 feet (1-30 meters.) Position your devices so that the number of walls or ceilings is minimized.
2.
2.2.
2. Be aware of the direct line between network devices. A wall that is 1.5 feet thick (.5 meters), at a 45-degree angle appears to be almost 3 feet (1
meter) thick. At a 2-degree angle it looks over 42 feet (14 meters) thick! Position devices so that the signal will travel straight through a wall or
ceiling (instead of at an angle) for better reception.
3.
3.3.
3. Building Materials make a difference. A solid metal door or aluminum studs may have a negative effect on range. Try to position access points,
wireless routers, and computers so that the signal passes through drywall or open doorways. Materials and objects such as glass, steel, metal,
walls with insulation, water (fish tanks), mirrors, file cabinets, brick, and concrete will degrade your wireless signal.
4.
4.4.
4. Keep your product away (at least 3-6 feet or 1-2 meters) from electrical devices or appliances that generate RF noise.
5.
5.5.
5. If you are using 2.4GHz cordless phones or X-10 (wireless products such as ceiling fans, lights, and home security systems), your wireless
connection may degrade dramatically or drop completely. Make sure your 2.4GHz phone base is as far away from your wireless devices as
possible. The base transmits a signal even if the phone in not in use.

Section 2 - Installation
D-Link DSL-6740U User Manual 15
Device Installation
The DSL-6740U Wireless VDSL Router maintains three separate interfaces, an Ethernet LAN, a wireless LAN and an VDSL Internet (WAN)
connection. Carefully consider the Router’s location suitable for connectivity for your Ethernet and wireless devices. You must have a functioning
broadband connection via a bridge device such as a Cable or VDSL 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.
1.1.
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.
2.2.
2. Push down the Power button, and you should see the Power LED indicator light up and remain lit.
3.
3.3.
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 VDSL connection, if the VDSL 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-6740U 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.
1.1.
1. Press and hold the reset button while the device is powered off.
2.
2.2.
2. Turn on the power.
3.
3.3.
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 VDSL Line
Use the VDSL cable included with the Router to connect it to a telephone wall socket or receptacle. Plug one end of the cable into the VDSL 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 VDSL 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 10BASE-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.

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D-Link DSL-6740U 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-6740U User Manual 18
Configuration
This section will show you how to configure your new D-Link wireless 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. The next section describes how to change the IP configuration for a computer running a Windows operating
system to be a DHCP client.
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-6740U 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
VDSL
SETUP
Click on the Setup Wizard button to launch the Setup Wizard.
WELCOME TO D
-
LINK SETUP WIZARD
There are six steps to configuring your router. Click on the Next to
continue.

Section 3 - Configuration
D-Link DSL-6740U User Manual 20
STEP 1: CHANGE YOUR DSL-6740U 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.