D Link DIR855A2 Xtreme N DUO MEDIA ROUTER User Manual 3

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Section 3 - Configuration
Routing
The Routing option is an advanced method of customizing specific routes of data through your network.
Destination IP: Enter the IP address of packets that will take
this route.
Netmask: Enter the netmask of the route, please note
that the octets must match your destination
IP address.
Gateway: Enter your next hop gateway to be taken if this
route is used.
Metric: The route metric is a value from 1 to 16 that
indicates the cost of using this route. A value 1
is the lowest cost and 15 is the highest cost.
Interface: Select the interface that the IP packet must
use to transit out of the router when this route
is used.
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Section 3 - Configuration
Advanced Wireless Settings
802.11n/g (2.4GHz)
Transmit Power: Set the transmit power of the antennas.
Beacon Period: Beacons are packets sent by an Access Point to
synchronize a wireless network. Specify a value.
100 is the default setting and is recommended.
RTS Threshold: This value should remain at its default setting of
2432. If inconsistent data flow is a problem, only
a minor modification should be made.
Fragmentation The fragmentation threshold, which is specified
Threshold: in bytes, determines whether packets will be
fragmented. Packets exceeding the 2346 byte
setting will be fragmented before transmission.
2346 is the default setting.
DTIM Interval: (Delivery Traffic Indication Message) 3 is the default setting. A DTIM is a countdown informing clients of the next window
for listening to broadcast and multicast messages.
Wireless Isolation: When checked, it will disable the ability for computers on the wireless network from seeing each other, but will allow you to
see computers on the wired network.
WMM Function: WMM is QoS for your wireless network. This will improve the quality of video and voice applications for your wireless
clients.
WLAN Partition: Enable this option to prevent associated wireless clients from communicating with each other.
Short GI: Check this box to reduce the guard interval time therefore increasing the data capacity. However, it’s less reliable and may
create higher data loss.
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Section 3 - Configuration
Advanced Wireless Settings
802.11n/a (5GHz)
Transmit Power: Set the transmit power of the antennas.
Beacon Period: Beacons are packets sent by an Access Point to
synchronize a wireless network. Specify a value.
100 is the default setting and is recommended.
RTS Threshold: This value should remain at its default setting of
2432. If inconsistent data flow is a problem, only
a minor modification should be made.
Fragmentation The fragmentation threshold, which is specified
Threshold: in bytes, determines whether packets will be
fragmented. Packets exceeding the 2346 byte
setting will be fragmented before transmission.
2346 is the default setting.
DTIM Interval: (Delivery Traffic Indication Message) 3 is the
default setting. A DTIM is a countdown informing clients of the next window for listening to broadcast and multicast
messages.
Wireless Isolation: When checked, it will disable the ability for computers on the wireless network from seeing each other, but will allow you to
see computers on the wired network.
WMM Function: WMM is QoS for your wireless network. This will improve the quality of video and voice applications for your wireless
clients.
WLAN Partition: Enable this option to prevent associated wireless clients from communicating with each other.
Short GI: Check this box to reduce the guard interval time therefore increasing the data capacity. However, it’s less reliable and may
create higher data loss.
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Section 3 - Configuration
WISH Settings
WISH is short for Wireless Intelligent Stream Handling, a technology developed to enhance your experience of using
a wireless network by prioritizing the traffic of different applications.
Enable WISH: Enable this option if you want to allow WISH
to prioritize your traffic.
HTTP: Allows the router to recognize HTTP transfers
for many common audio and video streams
and prioritize them above other traffic. Such
streams are frequently used by digital media
players.
Windows Media Enables the router to recognize certain audio
Center: and video streams generated by a Windows
Media Center PC and to prioritize these above
other traffic. Such streams are used by systems
known as Windows Media Extenders, such as
the Xbox 360.
Automatic: When enabled, this option causes the router
to automatically attempt to prioritize traffic
streams that it doesn’t otherwise recognize,
based on the behaviour that the streams
exhibit. This acts to deprioritize streams that
exhibit bulk transfer characteristics, such as
file transfers, while leaving interactive traffic,
such as gaming or VoIP, running at a normal
priority.
WISH Rules: A WISH Rule identifies a specific message flow and assigns a priority to that flow. For most applications, the priority classifiers
ensure the right priorities and specific WISH Rules are not required.
WISH supports overlaps between rules. If more than one rule matches for a specific message flow, the rule with the highest
priority will be used.
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Section 3 - Configuration
Name: Create a name for the rule that is meaningful
to you.
Priority: The priority of the message flow is entered
here. The four priorities are defined as:
BK: Background (least urgent)
BE: Best Effort.
VI: Video
VO: Voice (most urgent)
Protocol: The protocol used by the messages.
Host IP Range: The rule applies to a flow of messages for which one computer’s IP address falls within the range set here.
Host Port Range: The rule applies to a flow of messages for which host’s port number is within the range set here.
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Section 3 - Configuration
Advanced Network Settings
Enable UPnP: To use the Universal Plug and Play (UPnP™) feature
click on Enabled. UPNP provides compatibility with
networking equipment, software and peripherals.
WAN Ping: Unchecking the box will not allow the DIR-855 to
respond to pings. Blocking the Ping may provide
some extra security from hackers. Check the box
to allow the Internet port to be “pinged”.
WAN Ping Select from the drop-down menu if you would
Inbound Filter: like to apply the Inbound Filter to the WAN ping.
Refer to page 44 for more information regarding
Inbound Filter.
UPnP
Internet Ping Block
Internet Port Speed
Multicast Streams
WAN Port Speed: You may set the port speed of the Internet port
to 10Mbps, 100Mbps, or auto. Some older cable
or DSL modems may require you to set the port
speed to 10Mbps.
Multicast Check the box to allow multicast traffic to pass
streams: through the router from the Internet.
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Section 3 - Configuration
Administrator Settings
This page will allow you to change the Administrator and User passwords. You can also enable Remote Management.
There are two accounts that can access the management interface through the web browser. The accounts are admin
and user. Admin has read/write access while user has read-only access. User can only view the settings but cannot
make any changes. Only the admin account has the ability to change both admin and user account passwords.
Admin Password: Enter a new password for the Administrator Login Name. The administrator
can make changes to the settings.
User Password: Enter the new password for the User login. If you login as the User, you cannot
change the settings (you can only view them).
Gateway Name: Enter a name for the DIR-855 router.
Enable Graphical Enables a challenge-response test to require users to type letters or numbers
Authentication: from a distorted image displayed on the screen to prevent online hackers and
unauthorized users from gaining access to your router’s network settings.
Enable HTTPS Check to enable HTTPS to connect to the router securely.
Server:
Enable Remote Remote management allows the DIR-855 to be configured from the Internet
Management: by a web browser. A username and password is still required to access the
Web-Management interface. In general, only a member of your network can
browse the built-in web pages to perform Administrator tasks. This feature
enables you to perform Administrator tasks from the remote (Internet) host.
The port number used to access the DIR-855.
Remote Admin Example: http://x.x.x.x:8080 whereas x.x.x.x is the Internet IP address of the DIR-855 and 8080 is the port used for the
Inbound Filter: Web Management interface. If you have enabled HTTPS Server and checked Use HTTPS, you must enter https:// as part
of the URL to access the router remotely.
Details: This section will list any rules that are created. You may click the Edit icon to change the settings or enable/disable the rule,
or click the Delete icon to remove the rule.
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Section 3 - Configuration
Time Settings
The Time Configuration option allows you to configure, update, and maintain the correct time on the internal system
clock. From this section you can set the time zone that you are in and set the Time Server. Daylight Saving can also
be configured to automatically adjust the time when needed.
Time Zone: Select the Time Zone from the drop-down
menu.
Daylight Saving: To select Daylight Saving time manually, select
enabled or disabled, and enter a start date and
an end date for daylight saving time.
Enable NTP Server: NTP is short for Network Time Protocol.
NTP synchronizes computer clock times in a
network of computers. Check this box to use a
NTP server. This will only connect to a server
on the Internet, not a local server.
NTP Server Used: Enter the NTP server or select one from the
drop-down menu.
Manual: To manually input the time, enter the values
in these fields for the Year, Month, Day, Hour,
Minute, and Second and then click Set Time.
You can also click Copy Your Computer’s
Time Settings.
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Section 3 - Configuration
SysLog
The Broadband Router keeps a running log of events and activities occurring on the Router. You may send these logs
to a SysLog server on your network.
Enable Logging to Check this box to send the router logs to a
SysLog Server: SysLog Server.
SysLog Server IP The address of the SysLog server that will be
Address: used to send the logs. You may also select
your computer from the drop-down menu (only
if receiving an IP address from the router via
DHCP).
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Section 3 - Configuration
Email Settings
The Email feature can be used to send the system log files, router alert messages, and firmware update notification
to your email address.
Enable Email When this option is enabled, router activity logs
Notification: are e-mailed to a designated email address.
From Email This email address will appear as the sender
Address: when you receive a log file or firmware upgrade
notification via email.
To Email Address: Enter the email address where you want the
email sent.
SMTP Server Enter the SMTP server address for sending email.
Address: If your SMTP server requires authentication,
select this option.
Enable Check this box if your SMTP server requires
Authentication: authentication.
Account Name: Enter your account for sending email.
Password: Enter the password associated with the
account. Re-type the password associated with
the account.
On Log Full: When this option is selected, logs will be sent
via email when the log is full.
On Schedule: Selecting this option will send the logs via email
according to schedule.
Schedule: This option is enabled when On Schedule is selected. You can select a schedule from the list of defined schedules. To create
a schedule, go to Tools > Schedules.
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Section 3 - Configuration
System Settings
This section allows you to manage the router’s configuration settings, reboot the router, and restore the router to the
factory default settings. Restoring the unit to the factory default settings will erase all settings, including any rules that
you’ve created.
Save Settings to Use this option to save the current router
Local Hard Drive: configuration settings to a file on the hard disk
of the computer you are using. First, click the
Save button. You will then see a file dialog,
where you can select a location and file name
for the settings.
Load Settings from Use this option to load previously saved
Local Hard Drive: router configuration settings. First, use the
Browse control to find a previously save
file of configuration settings. Then, click the
Load button to transfer those settings to the
router.
Restore to Factory This option will restore all configuration
Default Settings: settings back to the settings that were in effect
at the time the router was shipped from the
factory. Any settings that have not been saved
will be lost, including any rules that you have
created. If you want to save the current router
configuration settings, use the Save button
above.
Reboot Device: Click to reboot the router.
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Section 3 - Configuration
Update Firmware
You can upgrade the firmware of the Router here. Make sure the firmware you want to use is on the local hard drive of
the computer. Click on Browse to locate the firmware file to be used for the update. Please check the D-Link support
site for firmware updates at http://support.dlink.com. You can download firmware upgrades to your hard drive from the
D-Link support site.
Firmware Upgrade: Click on Check Now to find out if there is an
updated firmware; if so, download the new
firmware to your hard drive.
Browse: After you have downloaded the new firmware,
click Browse to locate the firmware update on
your hard drive. Click Upload to complete the
firmware upgrade.
Notifications Check Automatically Check Online for
Options: Latest Firmware Version to have the router
check automatically to see if there is a new
firmware upgrade.
Check Email Notification of Newer Firmware
Version to have the router send an email when
there is a new firmware available.
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Section 3 - Configuration
DDNS
The DDNS feature allows you to host a server (Web, FTP, Game Server, etc…) using a domain name that you have
purchased (www.whateveryournameis.com) with your dynamically assigned IP address. Most broadband Internet
Service Providers assign dynamic (changing) IP addresses. Using a DDNS service provider, your friends can enter in
your domain name to connect to your server no matter what your IP address is.
Enable Dynamic Dynamic Domain Name System is a method of
DNS: keeping a domain name linked to a changing
IP Address. Check the box to enable DDNS.
Server Address: Choose your DDNS provider from the drop
down menu.
Host Name: Enter the Host Name that you registered with
your DDNS service provider.
Username or Key: Enter the Username for your DDNS account.
Password or Key: Enter the Password for your DDNS account.
Timeout: Enter a time (in hours).
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Section 3 - Configuration
System Check
Ping Test: The Ping Test is used to send Ping packets to test if a
computer is on the Internet. Enter the IP Address that you
wish to Ping, and click Ping.
Ping Results: The results of your ping attempts will be displayed here.
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Section 3 - Configuration
Schedules
Schedules can be created for use with enforcing rules. For example, if you want to restrict web access to Mon-Fri from
3pm to 8pm, you could create a schedule selecting Mon, Tue, Wed, Thu, and Fri and enter a Start Time of 3pm and
End Time of 8pm.
Name: Enter a name for your new schedule.
Days: Select a day, a range of days, or All Week to
include every day.
Time: Check All Day - 24hrs or enter a start and end
time for your schedule.
Save: Click Save to save your schedule. You must click
Save Settings at the top for your schedules to
go into effect.
Schedule Rules The list of schedules will be listed here. Click the
List: Edit icon to make changes or click the Delete
icon to remove the schedule.
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Section 3 - Configuration
Device Information
This page displays the current information for the DIR-855. It will display the LAN, WAN (Internet), and Wireless
information. If your Internet connection is set up for a Dynamic IP address then a Release button and a Renew button
will be displayed. Use Release to disconnect from your ISP and use Renew to connect to your ISP.
If your Internet connection is set up for PPPoE, a Connect button and a Disconnect button will be displayed. Use
Disconnect to drop the PPPoE connection and use Connect to establish the PPPoE connection.
General: Displays the router’s time and firmware version.
WAN: Displays the MAC address and the public IP settings for the router.
LAN: Displays the MAC address and the private (local) IP settings for the
router.
Wireless LAN: Displays the wireless MAC address and your wireless settings such as
SSID and Channel.
LAN Computers: Displays computers and devices that are connected to the router via Ethernet
and that are receiving an IP address assigned by the router (DHCP).
IGMP Multicast Displays the Multicast Group IP Address.
Memberships:
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Section 3 - Configuration
Log
The router automatically logs (records) events of possible interest in it’s internal memory. If there isn’t enough internal
memory for all events, logs of older events are deleted but logs of the latest events are retained. The Logs option allows
you to view the router logs. You can define what types of events you want to view and the level of the events to view.
This router also has external Syslog Server support so you can send the log files to a computer on your network that
is running a Syslog utility.
What to View: You can select the types of messages that you want
to display from the log. Firewall & Security, System,
and Router Status messages can be selected.
View Levels: There are three levels of message importance:
Informational, Warning, and Critical. Select the
levels that you want displayed in the log.
Apply Log Settings: Will filter the log results so that only the selected
options appear.
Refresh: Updates the log details on the screen so it displays
any recent activity.
Clear: Clears all of the log contents.
Email Now: This option will send a copy of the router log to
the email address configured in the Tools > Email
screen.
Save Log: This option will save the router to a log file on your
computer.
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Section 3 - Configuration
Stats
The screen below displays the Traffic Statistics. Here you can view the amount of packets that pass through the DIR-855
on both the Internet, LAN ports and both the 802.11n/g (2.4GHz) and 802.11n/a (5GHz) wireless bands. The traffic
counter will reset if the device is rebooted.
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Section 3 - Configuration
Internet Sessions
The Internet Sessions page displays full details of active Internet sessions through your router. An Internet session is a
conversation between a program or application on a LAN-side computer and a program or application on a WAN-side
computer.
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Section 3 - Configuration
Wireless
The wireless client table displays a list of current connected wireless clients. This table also displays the connection
time and MAC address of the connected wireless clients.
WISH
The WISH details page displays full details of wireless clients that are connected when WISH is enabled.
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Section 3 - Configuration
Support
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Section 4 - Security
Wireless Security
This section will show you the different levels of security you can use to protect your data from intruders. The
DIR-855 offers the following types of security:
• WPA2 (Wi-Fi Protected Access 2) 		
• WPA (Wi-Fi Protected Access)			
• WPA2-PSK (Pre-Shared Key)
• WPA-PSK (Pre-Shared Key)
What is WPA?
WPA, or Wi-Fi Protected Access, is a Wi-Fi standard that was designed to improve the security features of WEP (Wired
Equivalent Privacy).
The 2 major improvements over WEP:
• Improved data encryption through the Temporal Key Integrity Protocol (TKIP). TKIP scrambles the keys
using a hashing algorithm and, by adding an integrity-checking feature, ensures that the keys haven’t
been tampered with. WPA2 is based on 802.11i and uses Advanced Encryption Standard (AES) instead
of TKIP.
• User authentication, which is generally missing in WEP, through the extensible authentication protocol
(EAP). WEP regulates access to a wireless network based on a computer’s hardware-specific MAC
address, which is relatively simple to be sniffed out and stolen. EAP is built on a more secure public-key
encryption system to ensure that only authorized network users can access the network.
WPA-PSK/WPA2-PSK uses a passphrase or key to authenticate your wireless connection. The key is an alpha-numeric
password between 8 and 63 characters long. The password can include symbols (!?*&_) and spaces. This key must
be the exact same key entered on your wireless router or access point.
WPA/WPA2 incorporates user authentication through the Extensible Authentication Protocol (EAP). EAP is built on a
more secure public key encryption system to ensure that only authorized network users can access the network.
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Section 4 - Security
Wireless Security Setup Wizard
To run the security wizard, click on Setup at the top and then
click Launch Wireless Security Setup Wizard.
Check the Manually set 5GHz band Network Name... box to
manually set your desired wireless network name for the 5GHz
band.
Type your desired wireless network name (SSID).
Automatically: Select this option to automatically generate
the router’s network key and click Next.
Manually: Select this option to manually enter your network
key and click Next.
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Section 4 - Security
If you selected Automatically, the summary window will
display your settings. Write down the security key and
enter this on your wireless clients. Click Save to save your
settings.
If you selected Manually, the following screen will appear.
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Section 4 - Security
Add Wireless Device with WPS Wizard
From the Basic > Wizard screen, click Add Wireless Device
with WPS.
Select Auto to add a wireless client using WPS (Wi-Fi Protected
Setup). Once you select Auto and click Connect, you will have
a 120 second time limit to apply the settings to your wireless
client(s) and successfully establish a connection.
If you select Manual, a settings summary screen will appear.
Write down the security key and enter this on your wireless
clients.
PIN: Select this option to use PIN method. In order to use this
method you must know the wireless client’s 8 digit PIN and
click Connect.
PBC: Select this option to use PBC (Push Button) method to
add a wireless client. Click Connect.
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Section 4 - Security
Configure WPA-Personal (PSK)
It is recommended to enable encryption on your wireless router before your wireless network adapters. Please establish
wireless connectivity before enabling encryption. Your wireless signal may degrade when enabling encryption due to
the added overhead.
1. Log into the web-based configuration by opening a web browser
and entering the IP address of the router (192.168.0.1). Click
on Setup and then click Wireless Settings on the left side.
2. Next to Security Mode, select WPA-Personal.
3. Next to WPA Mode, select Auto, WPA2 Only, or WPA Only. Use
Auto if you have wireless clients using both WPA and WPA2.
4. Next to Cypher Type, select TKIP and AES, TKIP, or AES.
5. Next to Group Key Update Interval, enter the amount of time
before the group key used for broadcast and multicast data is
changed (3600 is default).
6. Next to Pre-Shared Key, enter a key (passphrase). The key is entered as a pass-phrase in ASCII format at both ends
of the wireless connection. The pass-phrase must be between 8-63 characters.
7. Click Save Settings to save your settings. If you are configuring the router with a wireless adapter, you will lose
connectivity until you enable WPA-PSK on your adapter and enter the same passphrase as you did on the router.
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Section 4 - Security
Configure WPA-Enterprise (RADIUS)
It is recommended to enable encryption on your wireless router before your wireless network adapters. Please establish
wireless connectivity before enabling encryption. Your wireless signal may degrade when enabling encryption due to
the added overhead.
1. Log into the web-based configuration by opening a web browser
and entering the IP address of the router (192.168.0.1). Click
on Setup and then click Wireless Settings on the left side.
2. Next to Security Mode, select WPA-Enterprise.
3. Next to WPA Mode, select Auto, WPA2 Only, or WPA Only. Use
Auto if you have wireless clients using both WPA and WPA2.
4. Next to Cypher Type, select TKIP and AES, TKIP, or AES.
5. Next to Group Key Update Interval, enter the amount of time
before the group key used for broadcast and multicast data is
changed (3600 is default).
6. Next to Authentication Timeout, enter the amount of time before
a client is required to re-authenticate (60 minutes is default).
7. Next to RADIUS Server IP Address enter the IP Address of your RADIUS server.
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Section 4 - Security
8. Next to RADIUS Server Port, enter the port you are using with
your RADIUS server. 1812 is the default port.
9. Next to RADIUS Server Shared Secret, enter the security
key.
10. If the MAC Address Authentication box is selected then the
user will need to connect from the same computer whenever
logging into the wireless network.
11. Click Advanced to enter settings for a secondary RADIUS
Server.
12. Click Apply Settings to save your settings.
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Section 5 - Connecting to a Wireless Network
Connect to a Wireless Network
Using Windows Vista®
Windows Vista® users may use the built-in wireless utility. If you are using another company’s utility or Windows® 2000,
please refer to the user manual of your wireless adapter for help with connecting to a wireless network. Most utilities
will have a “site survey” option similar to the Windows Vista® utility as seen below.
If you receive the Wireless Networks Detected bubble, click on
the center of the bubble to access the utility.
or
Right-click on the wireless computer icon in your system tray
(lower-right corner next to the time). Select Connect to a
network.
The utility will display any available wireless networks in your
area. Click on a network (displayed using the SSID) and click
the Connect button.
If you get a good signal but cannot access the Internet, check you
TCP/IP settings for your wireless adapter. Refer to the Networking
Basics section in this manual for more information.
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Section 5 - Connecting to a Wireless Network
Configure Wireless Security
It is recommended to enable wireless security (WPA/WPA2) on your wireless router or access point before configuring
your wireless adapter. If you are joining an existing network, you will need to know the security key or passphrase
being used.
1. Open the Windows Vista® Wireless Utility by right-clicking on
the wireless computer icon in your system tray (lower right
corner of screen). Select Connect to a network.
2. Highlight the wireless network (SSID) you would like to
connect to and click Connect.
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Section 5 - Connecting to a Wireless Network
3. Enter the same security key or passphrase that is on your router
and click Connect.
It may take 20-30 seconds to connect to the wireless network. If the
connection fails, please verify that the security settings are correct.
The key or passphrase must be exactly the same as on the wireless
router.
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Section 5 - Connecting to a Wireless Network
Connect Using WCN 2.0 in Windows Vista®
The router supports Wi-Fi protection, referred to as WCN 2.0 in Windows Vista®. The following instructions for setting
this up depends on whether you are using Windows Vista® to configure the router or third party software.
When you first set up the router, Wi-Fi protection is disabled and unconfigured. To enjoy the benefits of Wi-Fi protection,
the router must be both enabled and configured. There are three basic methods to accomplish this: use Windows Vista’s
built-in support for WCN 2.0, use software provided by a third party, or manually configure.
If you are running Windows Vista®, log into the router and click the Enable checkbox in the Basic > Wireless section.
Use the Current PIN that is displayed on the Advanced > Wi-Fi Protected Setup section or choose to click the Generate
New PIN button or Reset PIN to Default button.
If you are using third party software to set up Wi-Fi Protection, carefully follow the directions. When you are finished,
proceed to the next section to set up the newly-configured router.
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Section 5 - Connecting to a Wireless Network
Connect to a Wireless Network
Using Windows® XP
Windows® XP users may use the built-in wireless utility (Zero Configuration Utility). The following instructions are for
Service Pack 2 users. If you are using another company’s utility or Windows® 2000, please refer to the user manual
of your wireless adapter for help with connecting to a wireless network. Most utilities will have a “site survey” option
similar to the Windows® XP utility as seen below.
If you receive the Wireless Networks Detected bubble, click on
the center of the bubble to access the utility.
or
Right-click on the wireless computer icon in your system tray
(lower-right corner next to the time). Select View Available
Wireless Networks.
The utility will display any available wireless networks in your
area. Click on a network (displayed using the SSID) and click the
Connect button.
If you get a good signal but cannot access the Internet, check you
TCP/IP settings for your wireless adapter. Refer to the Networking
Basics section in this manual for more information.
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Section 5 - Connecting to a Wireless Network
Configure WPA-PSK
It is recommended to enable WPA on your wireless router or access point before configuring your wireless adapter. If
you are joining an existing network, you will need to know the WPA key being used.
1. Open the Windows® XP Wireless Utility by right-clicking
on the wireless computer icon in your system tray
(lower-right corner of screen). Select View Available
Wireless Networks.
2. Highlight the wireless network (SSID) you would like to
connect to and click Connect.
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Section 5 - Connecting to a Wireless Network
3. The Wireless Network Connection box will appear. Enter the
WPA-PSK passphrase and click Connect.
It may take 20-30 seconds to connect to the wireless network. If the
connection fails, please verify that the WPA-PSK settings are correct.
The WPA-PSK passphrase must be exactly the same as on the
wireless router.
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Section 6 - Troubleshooting
Troubleshooting
This chapter provides solutions to problems that can occur during the installation and operation of the DIR-855. Read
the following descriptions if you are having problems. The examples below are illustrated in Windows® XP. If you have
a different operating system, the screenshots on your computer will look similar to the following examples.
1. Why can’t I access the web-based configuration utility?
When entering the IP address of the D-Link router (192.168.0.1 for example), you are not connecting to a website on
the Internet or have to be connected to the Internet. The device has the utility built-in to a ROM chip in the device itself.
Your computer must be on the same IP subnet to connect to the web-based utility.
• Make sure you have an updated Java-enabled web browser. We recommend the following:
• Internet Explorer 6.0 or higher
• Firefox 3.0 or higher
• Safari 3.0 or higher
• Verify physical connectivity by checking for solid link lights on the device. If you do not get a solid link light, try using
a different cable or connect to a different port on the device if possible. If the computer is turned off, the link light may
not be on.
• Disable any internet security software running on the computer. Software firewalls such as Zone Alarm, Black Ice,
Sygate, Norton Personal Firewall, and Windows® XP firewall may block access to the configuration pages. Check the
help files included with your firewall software for more information on disabling or configuring it.
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Section 6 - Troubleshooting
• Configure your Internet settings:
• Go to Start > Settings > Control Panel. Double-click the Internet Options Icon. From the Security tab,
click the button to restore the settings to their defaults.
• Click the Connection tab and set the dial-up option to Never Dial a Connection. Click the LAN Settings
button. Make sure nothing is checked. Click OK.
• Go to the Advanced tab and click the button to restore these settings to their defaults. Click OK three
times.
• Close your web browser (if open) and open it.
• Access the web management. Open your web browser and enter the IP address of your D-Link router in the address
bar. This should open the login page for your the web management.
• If you still cannot access the configuration, unplug the power to the router for 10 seconds and plug back in. Wait
about 30 seconds and try accessing the configuration. If you have multiple computers, try connecting using a different
computer.
2. What can I do if I forgot my password?
If you forgot your password, you must reset your router. Unfortunately this process will change all your settings back
to the factory defaults.
To reset the router, locate the reset button (hole) on the rear panel of the unit. With the router powered on, use a
paperclip to hold the button down for 10 seconds. Release the button and the router will go through its reboot process.
Wait about 30 seconds to access the router. The default IP address is 192.168.0.1. When logging in, the username is
admin and leave the password box empty.
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Section 6 - Troubleshooting
3. Why can’t I connect to certain sites or send and receive emails when connecting through my router?
If you are having a problem sending or receiving email, or connecting to secure sites such as eBay, banking sites, and
Hotmail, we suggest lowering the MTU in increments of ten (Ex. 1492, 1482, 1472, etc).
Note: AOL DSL+ users must use MTU of 1400.
To find the proper MTU Size, you’ll have to do a special ping of the destination you’re trying to go to. A destination could
be another computer, or a URL.
• Click on Start and then click Run.
• Windows® 95, 98, and Me users type in command (Windows® NT, 2000, and XP users type in cmd) and
press Enter (or click OK).
• Once the window opens, you’ll need to do a special ping. Use the following syntax:
ping [url] [-f] [-l] [MTU value]
Example: ping yahoo.com -f -l 1472
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Section 6 - Troubleshooting
You should start at 1472 and work your way down by 10 each time. Once you get a reply, go up by 2 until you get a
fragmented packet. Take that value and add 28 to the value to account for the various TCP/IP headers. For example,
lets say that 1452 was the proper value, the actual MTU size would be 1480, which is the optimum for the network
we’re working with (1452+28=1480).
Once you find your MTU, you can now configure your router with the proper MTU size.
To change the MTU rate on your router follow the steps below:
• Open your browser, enter the IP address of your router (192.168.0.1) and click OK.
• Enter your username (admin) and password (blank by default). Click OK to enter the web configuration
page for the device.
• Click on Setup and then click Manual Configure.
• To change the MTU enter the number in the MTU field and click Save Settings to save your settings.
• Test your email. If changing the MTU does not resolve the problem, continue changing the MTU in
increments of ten.
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Appendix A - Wireless Basics
Wireless Basics
D-Link wireless products are based on industry standards to provide easy-to-use and compatible high-speed wireless
connectivity within your home, business or public access wireless networks. Strictly adhering to the IEEE standard,
the D-Link wireless family of products will allow you to securely access the data you want, when and where you want
it. You will be able to enjoy the freedom that wireless networking delivers.
A wireless local area network (WLAN) is a cellular computer network that transmits and receives data with radio signals
instead of wires. Wireless LANs are used increasingly in both home and office environments, and public areas such
as airports, coffee shops and universities. 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 have proven
to be beneficial for many users.
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 Ethernet adapter cards.
Under many circumstances, it may be desirable for mobile network devices to link to a conventional Ethernet LAN in
order to use servers, printers or an Internet connection supplied through the wired LAN. A Wireless Router is a device
used to provide this link.
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Appendix A - Wireless Basics
What is Wireless?
Wireless or Wi-Fi technology is another way of connecting your computer to the network without using wires. Wi-Fi
uses radio frequency to connect wirelessly, so you have the freedom to connect computers anywhere in your home or
office network.
Why D-Link Wireless?
D-Link is the worldwide leader and award winning designer, developer, and manufacturer of networking products.
D-Link delivers the performance you need at a price you can afford. D-Link has all the products you need to build your
network.
How does wireless work?
Wireless works similar to how cordless phone work, through radio signals to transmit data from one point A to point
B. But wireless technology has restrictions as to how you can access the network. You must be within the wireless
network range area to be able to connect your computer. There are two different types of wireless networks Wireless
Local Area Network (WLAN), and Wireless Personal Area Network (WPAN).
Wireless Local Area Network (WLAN)
In a wireless local area network, a device called an Access Point (AP) connects computers to the network. The access
point has a small antenna attached to it, which allows it to transmit data back and forth over radio signals. With an
indoor access point as seen in the picture, the signal can travel up to 300 feet. With an outdoor access point the signal
can reach out up to 30 miles to serve places like manufacturing plants, industrial locations, college and high school
campuses, airports, golf courses, and many other outdoor venues.
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Appendix A - Wireless Basics
Wireless Personal Area Network (WPAN)
Bluetooth is the industry standard wireless technology used for WPAN. Bluetooth devices in WPAN operate in a range
up to 30 feet away.
Compared to WLAN the speed and wireless operation range are both less than WLAN, but in return it doesn’t use
nearly as much power which makes it ideal for personal devices, such as mobile phones, PDAs, headphones, laptops,
speakers, and other devices that operate on batteries.
Who uses wireless?
Wireless technology as become so popular in recent years that almost everyone is using it, whether it’s for home, office,
business, D-Link has a wireless solution for it.
Home
• Gives everyone at home broadband access
• Surf the web, check email, instant message, and etc
• Gets rid of the cables around the house
• Simple and easy to use
Small Office and Home Office
• Stay on top of everything at home as you would at office
• Remotely access your office network from home
• Share Internet connection and printer with multiple computers
• No need to dedicate office space
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Appendix A - Wireless Basics
Where is wireless used?
Wireless technology is expanding everywhere not just at home or office. People like the freedom of mobility and it’s
becoming so popular that more and more public facilities now provide wireless access to attract people. The wireless
connection in public places is usually called “hotspots”.
Using a D-Link Cardbus Adapter with your laptop, you can access the hotspot to connect to Internet from remote
locations like: Airports, Hotels, Coffee Shops, Libraries, Restaurants, and Convention Centers.
Wireless network is easy to setup, but if you’re installing it for the first time it could be quite a task not knowing where to
start. That’s why we’ve put together a few setup steps and tips to help you through the process of setting up a wireless
network.
Tips
Here are a few things to keep in mind, when you install a wireless network.
Centralize your router or Access Point
Make sure you place the router/access point in a centralized location within your network for the best performance. Try
to place the router/access point as high as possible in the room, so the signal gets dispersed throughout your home.
If you have a two-story home, you may need a repeater to boost the signal to extend the range.
Eliminate Interference
Place home appliances such as cordless telephones, microwaves, and televisions as far away as possible from the
router/access point. This would significantly reduce any interference that the appliances might cause since they operate
on same frequency.
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