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Section 8 - Troubleshooting
3. Why can’t I connect to certain sites or send and receive e-mail when connecting through my router? 
If you are having a problem sending or receiving e-mail, 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 8 - 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  e-mail.  If  changing  the  MTU  does  not  resolve  the  problem,  continue  changing  the  MTU  in 
increments of ten. 
 
4. What can I do if the DIR-685 locks up or stops responding?
If the LCD touchpad panel ever becomes unresponsive, or if the router itself is malfunctioning, you may need to reset 
the device. The DIR-685 can be reset by unplugging the power adapter from the wall for a few seconds. Plug it back 
in and wait a few moments for the router to restart.
Note: There is no on/off button on the router. The reset button on the back of the router is used to restore the router  settings to factory defaults. 
						

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Appendix B - Networking Basics
Networking Basics
Check your IP address
After you install your new D-Link adapter, by default, the TCP/IP settings should be set to obtain an IP address from 
a DHCP server (i.e. wireless router) automatically. To verify your IP \
address, please follow the steps below.
Click  on  Start  > Run. In  the  run  box  type  cmd  and  click OK.  (Windows  Vista
®  users  type cmd  in  the Start  Search 
box.)
At the prompt, type ipconfig and press Enter.
This will display the IP address, subnet mask, and 
the default gateway of your adapter.
If  the  address  is  0.0.0.0,  check  your  adapter 
installation,  security  settings,  and  the  settings 
on your router. Some firewall software programs 
may  block  a  DHCP  request  on  newly  installed 
adapters. 
If you are connecting to a wireless network at a hotspot (e.g. hotel, coffee shop, airport), please contact an employee 
or administrator to verify their wireless network settings. 
						

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Appendix B - Networking Basics
Statically Assign an IP address
If you are not using a DHCP capable gateway/router, or you need to assign a static IP address, please follow the steps 
below:
Step 1
Windows Vista
® -  Click on  Start >  Control Panel >  Network and Internet >  Network and Sharing Center >  Manage 
Network Connections.
Windows
® XP -  Click on Start > Control Panel  > Network Connections.
Windows
® 2000 -  From the desktop, right-click  My Network Places > Properties.
Step 2
Right-click on the  Local Area Connection which represents your D-Link network adapter and select  Properties.
Step 3
Highlight  Internet Protocol (TCP/IP)  and click Properties.
Step 4
Click  Use the following IP address and enter an IP address that is on the same 
subnet as your network or the LAN IP address on your router. 
Example:  If  the  router´s  LAN  IP  address  is  192.168.0.1,  make  your  IP  address 
192.168.0.X where X is a number between 2 and 99. Make sure that the number 
you choose is not in use on the network. Set Default Gateway the same as the LAN 
IP address of your router (192.168.0.1). 
Set Primary DNS the same as the LAN IP address of your router (192.168.0.1). The 
Secondary DNS is not needed or you may enter a DNS server from your ISP.\
Step 5
Click OK twice to save your settings. 
						

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Appendix C - Glossary
802.11a  - An IEEE wireless LAN specification standard that operates on the 5GHz frequency band.*
802.11b - An IEEE wireless LAN specification standard that operates on the 2.4GHz frequency band and is interoperable 
with 802.11b standard devices. 
802.11g - An IEEE wireless LAN specification standard that operates on the 2.4GHz frequency band and is interoperable 
with 802.11g standard devices. 
802.11n - An IEEE wireless LAN specification standard that operates on the 2.4GHz and 5GHz frequency bands and 
is interoperable with 802.11n standard devices.*
Access Point - A device that creates wireless signal to allow users to connect wirele\
ssly in a wired network.
Bridge - Connects any wired Ethernet device to a wireless network.
Broadband - Fast Internet connections typically at home such as DSL, and Cable that allow high bandwidth capability 
are considered broadband connection.
Bluetooth - A low power short-range wireless network used to connect between desktops and laptop computers, PDAs, 
digital cameras, scanners, cell phones, and printers. Bluetooth wireless\
 signal can transmit up to 30 feet. 
Cable  Modem  -  A  device  that  works  over  coaxial  line  (TV),  providing  high  bandwidth  transfer  rate,  to  access  the 
Internet.
Cardbus Network Adapter - A device that connects a laptop to the network. 
Glossary
* The DIR-685 supports 2.4GHz only 
						

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Appendix C - Glossary
DDNS (Dynamic Domain Name System)  - A service that maps Internet domain name to a dynamic IP address as it 
changes.
DHCP (Dynamic Host Configuration Protocol) - A protocol that dynamically assigns IP address to devices on the 
network.
DSL (Digital Subscriber Line) - DSL allows a high bandwidth transfer rates using existing phone line, to access the 
Internet.
Ethernet - First generation of Ethernet transfers up to 10 Mbps. Fast Ethernet, the second generation transfers up to 
100Mbps, and Gigabit Ethernet, the third generation of Ethernet transfer\
s up to 1000Mbps.
Firewall  - A security feature that protects a network by preventing intruders to \
connect. 
Hotspots - A place usually in public where you can access wireless connection to the Internet. Hotspots are commonly 
found at airports, hotels, coffee shops, libraries, restaurants, and con\
vention centers.
IP (Internet Protocol) Address  - An unique number that identifies computers or devices on the network.
ISP  (Internet  Service  Provider)  -  Company  that  provides  Internet  access  such  as  Cox,  Adelphia,  SBC,  Verizon, 
Comcast, and many more.
LAN (Local Area Network) - Group of computers connected together that can share data and peripherals such as 
printers, scanners, and etc.
PCI Network Adapter - A device that connects a desktop to the network. 
Router - A device that connects LANs, WANs, and the Internet. 
SSID (Service Set Identifier) - A network name that identifies the wireless network. 
						

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Appendix C - Glossary
USB (Universal Serial Bus)  - A standard interface commonly used to connect peripheral devices to c\
omputers. 
VPN  (Virtual  Private  Network)  -  Provides  secured  remote  access  to  a  network  via  the  Internet  by  sending  data  in 
tunnels. 
WAN (Wide Area Network) - A network that covers a large geographic area, usually two or more LA\
Ns.
WEP (Wired Encryption Privacy) - A standard security feature used to encrypt data over a wireless network to prevent 
intruder.
WPA (Wi-Fi Protected Access)  - A stronger and more secured encryption than WEP to prevent intruders from trying 
to connect to wireless networks.
WLAN (Wireless Local Area Network) - A type of LAN that uses high-frequency radio waves to communicate with 
devices rather than wires. 
						

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Appendix D - Technical Specifications
Technical Specifications
Standards
  • IEEE 802.11n (draft 2.0)
  • IEEE 802.11g
  • IEEE 802.11b
  • IEEE 802.3
  • IEEE 802.3u
  • IEEE 802.3ab
  • SATA
  • USB 2.0
Wireless Signal Rates
1
     IEEE 802.11n draft 2.0 (HT20/40)
  • 144.4Mbps (300)    • 130Mbps (270)  
  • 117Mbps (243)    • 104Mbps (216)
  • 78Mbps (162)    • 66Mbps (135)
  • 58.5Mbps (121.5)    • 52Mbps (108)
  • 39Mbps (81)    • 26Mbps (54)
  • 19.5Mbps (40.5)    • 12Mbps (27)
  • 6.5Mbps (13.5)
    IEEE 802.11a
  • 54Mbps      • 48Mbps
  • 36Mbps      • 24Mbps
  • 18Mbps      • 12Mbps
  • 11Mbps      • 9Mbps
  • 6Mbps    
    IEEE 802.11g
  • 54Mbps      • 8Mbps
  • 36Mbps      • 24Mbps
  • 18Mbps      • 12Mbps
  • 11Mbps      • 9Mbps
  • 6Mbps      • 5.5Mbps    
  • 2Mbps      • 1Mbps     Frequency Range
2
    North America
 
• 2.412GHz to 2.462GHz (802.11g/n)
    General Europe
  • 2.412GHz to 2.472GHz (802.11g/n)
Wireless Security
  • WEP
  • WPA-Personal
  • WPA2-Personal
  • WPA-Enterprise
  • WPA2-Enterprise
Antenna
  • Two Internal Antennas (2 dBi)
LEDs
  • Power  
  • WPS 
  • Hard Drive Status
Display Panel
  • LCD TFT 3.2” QVGA
  •  Touch  Pad  with  Left,  Right,  Return,  Picture  Preview  and   
    Center (Confirm) Buttons.
Hard Drive Support
3
  • 2.5” SATA
 
Operating Temperature
  • 0° ~ 30° C  (32° ~ 86° F) 
						

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Appendix D - Technical Specifications
Operating Humidity
  • 90% Maximum (Non-condensing)
Safety & Emissions
  • FCC
  • CE
  • IC
  • C-Tick
  • NCC
Device Dimensions
  • L = 6.5 inches (165.7 mm)
  • W = 4.8 inches (122.8 mm)
  • H = 1.27 inches (32.36 mm)
Device Weight
  • 5.43 oz. (154.1 grams)
Stand Dimensions
  • L = 6.06 inches (154 mm)
  • W = 2.38 inches (60.5 mm)
  • H = 0.49 inches (12.44 mm)
Stand Weight
  • 4.58 oz.(129.9 grams)
1  Maximum  wireless  signal  rate  derived  from  IEEE  Standard  802.11g  and  Draft  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.
2  Frequency range varies based on country regulations.
3  No hard drive is included with this device. Current 2.5” SATA hard drives support up to 500GB. Capacity may increase pending future technology. This device may 
not work with older generation SATA drives. For a list of SATA drives th\
at have been tested to work with this device, visit your D-Link support \
web site.
4  Maximum Photo file size:  5MB
5  External Hard Drive Support: Limited to external 2.5 inch hard drive, without external power.