D-Link Air Xpert DI-774 User manual

2.4 GHz / 5 GHz Tri-Mode Dualband
Manual
Building Networks for People
D-LinkAir Xpert DI-774
Wireless Router

2
Contents
PackageContents ................................................................................3
Introduction............................................................................................4
Connections..........................................................................................5
Features ...............................................................................................6
LEDs ....................................................................................................7
Wireless Basics....................................................................................8
GettingStarted....................................................................................10
UsingtheConfigurationMenu..............................................................11
NetworkingBasics ..............................................................................40
Troubleshooting...................................................................................55
TechnicalSpecifications ......................................................................61
FrequentlyAskedQuestions................................................................64
ContactingTechnical Support ..............................................................92
Warranty andRegistration ...................................................................93

3
Contents of Package:
D-Link Air Xpert DI-774 2.4GHz/5GHz Tri-Mode Dualband
Wireless Router
PowerAdapter – 5V DC, 3.0A
ManualonCD
QuickInstallation Guide
Ethernet Cable
Package Contents
Computer with Windows, Macintosh, or Linux-based
operating system with an installed Ethernet adapter
Note:Using a powersupply withadifferent voltagerating than theone includedwith the
DI-774will causedamageand voidthe warrantyfor this product.
If any of the above items are missing, please contact your reseller.
System Requirements For Configuration:
!
!
!
!
!
!

4
Introduction
Atup tofivetimes thespeed ofprevious wirelessdevices,you canwork fasterand more
efficiently,increasing productivity. Withthe DI-774,bandwidth-intensiveapplicationslike
graphics or multimedia will benefit significantly because large files are able to move
across the network quickly. This versatile wireless router also features four times the
numberof non-overlapping channelsthan a devicethat supportsonly 802.11g, somore
users can access the network.
Supportforall three standards(802.11g; 802.11a; 802.11b) means thatyoucan grow
yournetworkwithout havingtoworryabout legacywirelessequipment beingincompatible
with newer compliant devices from other manufacturers. This also allows network
administratorstopartition the usageof the dualbandbysegmenting users andcreating
specialaccess privilegenetworks forclassified documenttransferand communications.
With the DI-774 you can securely connect to wireless clients on the network using
802.1x for wireless user authentication, as well as WPA (Wi-Fi Protected Access )
providingyoua much higherlevelof security foryourdata and communicationsthan
haspreviously beenavailable.
Through its easy-to-use Web-based user interface, the DI-774 lets you control the
informationthat isaccessible tothose onthe wirelessnetwork, whetherfrom theInternet
orfrom your company’sserver:
Content Filtering –Easily appliedcontentfiltering basedon MACAddress,IPAddress,
URLand /or DomainName.
Filter Scheduling – Filters can be scheduled to be active on certain days or for a
durationofhours or minutes.
Network Address Translation – NAT protects the DI-774 and its users from outside
intrudersgainingaccess to yourprivate network
VPN Multiple/Concurrent Sessions – Supports multiple and concurrent IPSec and
PPTP sessions, so multiple users behind the DI-774 can access corporate networks
throughvariousVPN clientsmoresecurely.
TM

5
Connections - Back Panel of Unit
All Ethernet Ports (WAN and LAN)
areautoMDI/MDIX,meaningyoucan
use either a straight-through or a
crossover Ethernet cable.
AutoMDI/MDIX
LAN ports
automatically
sense the cable
typewhen
connecting to
Ethernet-enabled
computers.
TheAuto MDI/MDIX
WAN port is the
connection for the
Ethernet cable to
the Cable or DSL
modem
Receptor
for the
Power
Adapter
Pressing the
Reset Button
restores the
router to its
original factory
default settings.

6
Features
TM
!Connectsmultiplecomputers to a Broadband(Cable or DSL) modemto
sharethe Internet connection
!IPFiltering
!AdvancedFirewall features
!DHCPserver supported enablesallnetworked computerstoautomatically
receiveIP addresses
!Web-basedinterface forManaging andConfiguring
Access Control to manage users on the network
!
!Supportsspecial applications thatrequire multiple connections
!Equippedwith 4 10/100Ethernetports,1WAN port,Auto MDI/MDIX
!URLFiltering
!DomainBlocking
!Scheduling
!SupportsNAT withVPN pass-through,providing added security
!MACFiltering
Operatesin the 2.4GHzfrequency range
!
!User-friendlyconfiguration anddiagnostic utilities
!Utilizes OFDMtechnology (Orthogonal Frequency DivisionMultiplexing) to
ensurestrongwireless signals forboth 802.11gand 802.11a
802.1xAuthentication in conjunction withthe RADIUSserver verifiesthe
identity of would be clients
!
WPA (Wi Fi ProtectedAccess ) authorizes and identifies users based on a
secret key that changes automatically at a regular interval, for example:
!Backwardscompatible withthe 802.11b standardtoprovidea wirelessdata
rate of up to 11Mbps
!
Fullycompatiblewiththe 802.11g standardto provide awireless datarate of
upto54Mbps
!
!
!TKIP (Temporal Key Integrity Protocol), in conjunction with a RADIUS
server,changesthetemporalkeyevery10,000packets,ensuringgreater
security
Pre-Shared Key mode means that the home user, without a RADIUS
server, will obtain a new security key every time the he or she connects
to the network, vastly improving the safety of communications on the
network.

7
LEDs - Front Panel of Unit
LED stands for Light-Emitting Diode. The DI-774 has the following LEDs:
WLAN LEDs for 11a
and11gwirelessnet-
worksegments.
A solid light indi-
cates that the
wireless segment is
ready.The LEDs
blinkduring wireless
datatransmission
WANLED
A solid light
indicatesconnec-
tion on the WAN
port.This LED
blinksduring data
transmission
Local
NetworkLEDs
A solid light indicates
a connection to an
Ethernet-enabled
computeron ports 1-
4. The LEDs blink
duringdata transmis-
sion
Status
Ablinkinglight
indicates that the
DI-774is ready
Power
A solid light
indicatesa proper
connection to the
powersupply

8
Wireless Basics
D-Link wireless products are based on industry standards to provide easy-to-use and
compatiblehigh-speedwirelessconnectivitywithin yourhome,business orpublic access
wirelessnetworks.D-Link wireless productswill allow youaccessto the datayou want,
whenandwhereyouwantit.Youwillbeable toenjoythefreedomthatwirelessnetworking
brings.
A WLAN is a cellular computer network that transmits and receives data with radio
signals instead of wires. WLANs are used increasingly in both home and office
environments,andpublicareassuchasairports,coffeeshopsanduniversities.Innovative
ways to utilize WLAN technology are helping people to work and communicate more
efficiently. Increased mobility and the absence of cabling and other fixed infrastructure
haveproven to bebeneficial for manyusers.
Wireless users can use the same applications they use on a wired network. Wireless
adapter cards used on laptop and desktop systems support the same protocols as
Ethernetadapter cards.
Peopleusewireless LAN technologyfor many differentpurposes:
Mobility - Productivity increases when people have access to data in any location
within the operating range of the WLAN. Management decisions based on real-time
informationcan significantly improveworker efficiency.
Low Implementation Costs –WLANs are easy to set up, manage, change and
relocate. Networks that frequently change can benefit from WLANs ease of
implementation. WLANs can operate in locations where installation of wiring may be
impractical.
Installation and Network Expansion - Installing a WLAN system can be fast
andeasyand can eliminatetheneed to pull cablethrough walls and ceilings.Wireless
technologyallowsthe network togo where wirescannot go -evenoutside the homeor
office.
Scalability –WLANscan beconfiguredin avariety oftopologies to meetthe needsof
specific applications and installations. Configurations are easily changed and range
frompeer-to-peer networks suitablefor a smallnumber of usersto larger infrastructure
networkstoaccommodate hundreds orthousands of users, dependingon the number
ofwireless devices deployed.
Inexpensive Solution - Wireless network devices are as competitively priced as
conventionalEthernet networkdevices.

9
Standards-Based Technology
The DI-774 Wireless Broadband Router utilizes the new 802.11g standard, in addition
tothe802.11aand 802.11bstandards.
The IEEE 802.11g standard is an extension of the 802.11b standard. It increases the
data rate up to 54 Mbps within the 2.4GHz band, utilizing OFDM technology.
Thismeans that inmost environments, withinthe specified rangeof this device,you will
be able to transfer large files quickly or even watch a movie in MPEG format over your
network without noticeable delays. This technology works by transmitting high-speed
digitaldataoveraradio waveutilizingOFDM (OrthogonalFrequencyDivisionMultiplexing)
technology. OFDM works by splitting the radio signal into multiple smaller sub-signals
thatare then transmittedsimultaneouslyatdifferent frequencies tothe receiver. OFDM
reducestheamount of crosstalk(interference) insignal transmissions.
.
Wireless Basics (continued)
Installation Considerations
The D-Link AirXpert DI-774letsyou accessyournetwork, using awireless connection,
fromvirtuallyanywherewithinitsoperatingrange.Keepinmind,however, thatthenumber,
thickness and location of walls, ceilings, or other objects that the wireless signals must
passthrough,maylimitthe range.Typicalranges varydependingonthe typesofmaterials
and background RF (radio frequency) noise in your home or business. The key to
maximizing wireless range is to follow these basic guidelines:
Keepthe numberof walls andceilings betweenthe DI-624and othernetwork
devices toaminimum - eachwall or ceiling canreduce your D-Link wireless
product’s range from 3-90 feet (1-30 meters.) Position your devices so that
the number of walls or ceilings is minimized.
11
11
1
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
devicessothat the signalwilltravel straight through awall or ceiling (instead
ofatan angle) forbetter reception.
22
22
2
Building Materials can impede the wireless signal - a solid metal door or
aluminumstuds mayhave anegativeeffect onrange. Tryto positionwireless
devices and computers with wireless adapters so that the signal passes
throughdrywallor open doorwaysand not other materials.
33
33
3
Keep your product away (at least 3-6 feet or 1-2 meters) from electrical
devicesorappliances that generateextreme RF noise.
44
44
4

10
Getting Started
Setting up a
Wireless
Infrastructure
Network
5
1
4
2
6
3
Youwill need broadbandInternet access(a Cable orDSL-subscriber lineinto
yourhome oroffice)
Consultwith yourCable or DSLprovider forproper installationof themodem
ConnecttheCable or DSLmodem to theDI-774 Wireless Router(seethe
printedQuick Installation Guideincluded withyour router.)
If you are connecting a desktop computer to your network, install the D-Link Air
XpertDWL-AG520 wirelessPCIadapter intoan availablePCI sloton your
desktopcomputer.
(Seethe printed QuickInstallation Guide includedwith the networkadapter.)
InstalltheD-Link DWL-AG650 wirelessCardbus adapterinto a laptopcomputer.
(Seethe printedQuickInstallation Guideincludedwith theDWL-AG650.)
Installthe D-LinkDFE-530TX+wireless Cardbusadapter intoa desktopcom-
puter.Thefour EthernetLAN portsof theDI-774 areAuto MDI/MDIXand will
workwith bothStraight-through andCrossover cable.
(Seethe printed QuickInstallation Guide includedwith the DFE-530TX+.)
For a typical wireless setup at home (as shown above),
please do the following:

11
Whenever you want to configure your network or the DI-774, you can access the
Configuration Menu by opening the web-browser and typing in the IP Address of the
DI-774.TheDI-774 default IPAddressisshown here:
!Open the web browser
!Type in the IP Address of
theRouter (http://192.168.0.1)
!Type admin in the User
Name field
Leave the Password
blank
ClickOK
!
Using the Configuration Menu
Home > Wizard
The Home>Wizard screen will appear.
Please refer to the Quick Installation
Guidefor moreinformationregardingthe
Setup Wizard.
Note: if you have changed the default IP Address
assigned to the DI-774, make sure to enter the
correct IP Address.
!
These buttons appear
onmost of theconfigu-
ration screens in this
section.Pleaseclick on
the appropriate button
at the bottom of each
screen after you have
made a configuration
change.
http://192.168.0.1

12
Using the Configuration Menu (continued)
Home > Wireless > 802.11a
SSID-
Channel-
Wireless Settings- Choose 802.11a or 802.11g. Here, 802.11a is selected.
“default” is the default setting.All devices on the network must
share the same SSID. If you change the default setting, the
SSID may be up to 32 characters long.
52is thedefault channelfor802.11a. Alldevices onthe network
must share the same channel.
Hexadecimal digits consist of the numbers 0-9 and the letters A-F
ASCII (AmericanStandardCode for InformationInterchange) is a codefor repre-
senting English letters as numbers from 0-127
Keys 1-4- Input up to 4 WEP keys; select the one you wish to use.
Key Type- Select HEX or ASCII
WEP (WiredEquivalentPrivacy) If youenable encryption onthe DI-774
make sure to also enable encryption on all 802.11a wireless clients or
wireless connection will not be established.
WEP Encryption- Selectthe level ofencryption desired: 64,128 or 152-bit
WEP- Select Enabled or Disabled. Disabled is the default setting.

13
Using the Configuration Menu (continued)
Home > Wireless > 802.11g
Key Type- Select HEX or ASCII
WEP- Select Enabled or Disabled. Disabled is the default setting.
Channel- 1 is the default channel for 802.11g. All devices on the network
must share the same channel.
SSID- “default” is the default setting. All devices on the network must
share the same SSID. The SSID may be up to 32 characters
long.
Wireless Settings- Choose802.11aor 802.11g. Here, 802.11gis selected.
WEP (WiredEquivalentPrivacy) If youenable encryption onthe DI-774
make sure to also enable encryption on all 802.11g wireless clients or
wireless connection will not be established.
Keys 1-4- Input up to 4 WEP keys; select the one you wish to use.
WEP Encryption- Selectthe level ofencryption desired: 64,128 or 152-bit

14
Using the Configuration Menu (continued)
Home > WAN > Dynamic IPAddress
Dynamic
IPAddress- Most Cable modem users will select this option to obtain an IP
Address automatically from their ISP (Internet Service Pro-
vider).
Host Name- This is optional, but may be required by some ISPs. The host
name is the device name of the Router.
MACAddress- The default MAC Address is set to the WAN’s physical inter-
faceMACaddress on the Router.
Clone
MACAddress- Copy theMACaddressoftheEthernetcard installedbyyour ISP,
andreplace the WANMAC addresswiththis Ethernetcard MAC
address. Itisnotrecommendedthat youchangethedefaultMAC
addressunless required byyour ISP.
MTU- EnteranMTU value only ifrequired by your ISP.Otherwise,
leave this section to its default setting of 1500. (MTU is short
forMaximumTransfer Unit. Messageslonger than the MTU
will be divided into smaller units for transmission).
Primary/Secondary
DNS- Entera DNSAddressifyou donot wish touse theoneprovided
by your ISP. (DNS is short for Domain Name System. It trans-
lates domain names into IP Addresses).

15
Using the Configuration Menu (continued)
Home > WAN > Static IP Address
Static IP Address-
IP Address-
Subnet Mask-
ISP
GatewayAddress-
Select this option to set static IP information provided to you
by your ISP.
Inputthe IPAddressprovidedby yourISP
Input your Subnet mask. (All devices in the network must
havethe same subnetmask.)
Input the Gatewayaddress
MTU- EnteranMTU value only ifrequired by your ISP.Otherwise,
leave this section to its default setting of 1500. (MTU is short
forMaximumTransferUnit.Messages longer thanthe MTU
will be divided into smaller units for transmission).
Primary/
Secondary DNS- Enter a DNSAddress if you do not wish to use the one pro-
videdby yourISP.(DNS isshort forDomain NameSystem. It
translates domain names into IP Addresses).

16
Using the Configuration Menu (continued)
Home > WAN > PPPoE
User Name- YourPPPoE usernameprovided byyour ISP.
Password- YourPPPoE passwordprovided byyour ISP.
Retype Password- Re-enterthe PPPoEpassword
Service Name- Enterthe ServiceName providedby yourISP(optional).
IPAddress- This option is only available for Static PPPoE. Enter the static
IPAddress for the PPPoE connection.
PPPoE- Choose this option if your ISP uses PPPoE.
(Most DSL users
will select this option).
Dynamic PPPoE- receive an IP Address automaticsally from
yourISP.
Static PPPoE- you have an assigned (static) IPAddress.
Please
be sure
to remove any
existing PPPoE
client software
installed on your
computers.

17
Using the Configuration Menu (continued)
Home > WAN > PPPoE continued
Home > LAN
LAN is short for Lo-
cal Area Network.
This is considered
yourinternalnetwork.
Theseare theIP set-
tingsoftheLANinter-
face for the DI-774.
These settings may
be referred to as Pri-
vate settings. You
maychange theLAN
IPAddressif needed.
The LAN IPAddress
is private to your in-
ternal network and
cannot be seen on
theInternet.
Auto-reconnect- If enabled, the DI-774 will automatically connect to your ISP af-
ter your system is restarted or if the connection is dropped.
MTU- Maximum Transmission Unit-1472 is default-you may need to
change the MTU to conform with your ISP.
Subnet Mask- Thesubnet mask oftheLAN interface.
The default subnet mask is 255.255.255.0
IPAddress- TheIPAddressof theLANinterface. ThedefaultIPAsddressis:
192.168.0.1
Local Domain
Name- Thedomain nameassignedto therouter
Maximum
Idle Time- Enter a maximum idle time during which Internet connection is
maintained during inactivity. To disable this feature, enter zero
or enable Auto-reconnect.
Primary/Secondary
DNS- Entera DNSAddressifyou donot wish touse theoneprovided
by your ISP. (DNS is short for Domain Name System. It trans-
lates domain names into IP Addresses).

18
Using the Configuration Menu (continued)
Home > DHCP
DHCP standsfor
DynamicHost
ControlProtocol. The
DI-774has a built-in
DHCPserver.The
DHCPServer will
automaticallyassign
an IPAddress to the
computersonthe
LAN/privatenetwork.
Be sure to set your
computers to be
DHCP clients by
settingtheirTCP/IP
settings to “Obtain
an IPAddress
Automatically.” When
you turn your
computers on, they
will automatically
loadthe properTCP/
IPsettings provided
bythe DI-774. The
DHCPServer will
automatically
allocateanunused IP
Address from the IP
Address pool to the
requestingcomputer.
You must specify the starting and ending address of the IPAddress pool.
Static & Dynamic
DHCP Client
Table- Displays alistof Staticand Dynamic DHCPclientsassigned by
therouter
DHCP Server- Select Enabled or Disabled
Starting
IPAddress- The startingIPAddress fortheDHCPserver’s IPassignment
Ending
IPAddress- The endingIPAddress forthe DHCPserver’sIPassignment
Lease Time- Thelength of timeof the DHCPlease
Static DHCP- Enable the Static DHCP server to assign the same IPAddress
toa MACAddressthat youspecify here.Thispreventstheprob-
lemssometimes encountered withchanging IPAddresses

19
Advanced > Virtual Server
Using the Configuration Menu (continued)
TheDI-774can be configured asa virtual server sothat remote users accessingWeb
or FTP services via the public IPAddress can be automatically redirected to local
serversinthe LAN (LocalArea Network).
TheDI-774firewall feature filtersout unrecognized packetsto protect your LAN
network so all computers networked with the DI-774 are invisible to the outside world.
If you wish, you can make some of the LAN computers accessible from the Internet
byenabling Virtual Server. Dependingonthe requestedservice,the DI-774 redirects
theexternalservice request tothe appropriate serverwithinthe LAN network.

20
Advanced > Virtual Server continued
Using the Configuration Menu (continued)
TheDI-774is also capableof port-redirection meaningincomingtraffic to aparticular
port may be redirected to a different port on the server computer.
Each virtual service that is created will be listed at the bottom of the screen in the
Virtual Servers List. There are pre-defined virtual services already in the table. You
may use them by enabling them and assigning the server IP to use that particular
virtual service.
Example #1:
If you have a Web server that you wanted Internet users to access at all times, you
would need to enable it. Web (HTTP) server is on LAN (LocalArea Network)
computer 192.168.0.25. HTTP uses port 80, TCP.
Name: Web Server
Private IP: 192.168.0.25
Protocol Type: TCP
Private Port: 80
Public Port: 80
Schedule: always
Protocol Type- Theprotocolused forthe virtualservice
Public Port- Theport number onthe WAN (WideArea Network)sidethat will
be used to access the virtual service.
Private Port- Theport number ofthe serviceused by thePrivate IPcomputer
Schedule-Theschedule of timewhen the virtualservicewill be enabled.
The schedule may be set to Always, which will allow the
particular service to always be enabled. If it is set to Time,
select the time frame for the service to be enabled. If the
system time is outside of the scheduled time, the service will
bedisabled.
Virtual Server- Select Enabled or Disabled
Name- Enterthe namereferencing thevirtual service
Private IP- Theservercomputer intheLAN (LocalAreaNetwork)thatwillbe
providingthevirtual services.