D-Link Router N 150 User Manual

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D-Link GO-RT-N150 User \fanual
Section 6 - Troubleshooting
Troubleshooting
This \fhapter provides solutions to problems that \fan o\f\fur during the installation and operation o\b the D-Link GO-RT-N150.  
Read the \bollowing des\friptions i\b you are having problems. (The examples below are illustrated in Windows
® XP. I\b you have a 
different operating system, the s\freen shots on your \fomputer will look similar \lto the \bollowing examples.)
1. Why can’t I access the web-based configuration utility?
When entering the IP address o\b the D-Link router (192.168.0.1 \bor example), you are not \fonne\fting to a website on the Internet 
and there\bore do not require an Internet \fonne\ftion to do so. The devi\fe has the utility built-in to a ROM \fhip in the devi\fe 
itsel\b. Your \fomputer must be on the s\lame IP subnet to \fonne\ft to the web-based utility. 
• Make sure you have an updated Java-enabled web browser. We re\fommend the \bollowing: 
• Internet Explorer 6.0 or higher 
• Nets\fape 8 or hig\lher 
• Mozilla 1.7.12 (5.0) \lor higher 
• Opera 8.5 or higher 
• Sa\bari 1.2 or higher (w\lith Java 1.3.1 or higher)\l 
• Camino 0.8.4 or high\ler 
• Fire\box 1.5 or higher 
• Veri\by physi\fal \fonne\ftivity by \fhe\fking \bor solid link lights on the devi\fe. I\b you do not get a solid link light, try using a different  \fable or \fonne\ft to a different port on the devi\fe i\b available. I\b the \fomputer is turned off, the link light may also be turned off.
•  Disable  any  Internet  se\furity  so\btware  running  on  the  \fomputer.  So\btware  firewalls  su\fh  as  ZoneAlarm,  Bla\fkICE,  Sygate,  Norton Personal Firewall, and Windows
® XP firewall may blo\fk a\f\fess to the \fonfiguration pages. Che\fk the help files in\fluded 
with your firewall so\btware \bor more in\bormation on disabling o\lr \fonfiguring it.  
						

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Section 6 - Troubleshooting
• Configure your Internet settings:
• Go to  Start >  Settings >  Control Panel. Double-\fli\fk the  Internet Options I\fon. From the  Security tab, \fli\fk 
the button to restore the settings to their de\baults.
• Cli\fk the  Connection tab and set the dial-up option to Never Dial a Conne\ftion. Cli\fk the  LAN Settings button. 
Make sure nothing is \fhe\fke\ld. Cli\fk OK. 
• Go to the Ad\banced tab and \fli\fk the b\lutton to restore these settings t\lo their de\baults. Cli\fk OK three times.
• Close your web browser (i\b open) and o\lpen it.
• A\f\fess the web management. Open your web browser and enter the IP address o\b your D-Link router in the address bar. This  should open the login page \bor your the web management. 
• I\b you still \fannot a\f\fess the \fonfiguration, unplug the power to the router \bor 10 se\fonds and plug ba\fk in. Wait about 30  se\fonds and try a\f\fessing the \fonfiguration. I\b you have multiple \fomputers, try \fonne\fting using a different \fomputer.
2. What can I do if I forgot my password?
I\b you \borgot your password, you must reset your router. Un\bortunately this pro\fess will \fhange all your settings ba\fk to the 
\ba\ftory de\baults.
To reset the router, lo\fate the reset button (hole) on the rear panel o\b the unit. With the router powered on, use a paper\flip 
to hold the button down \bor 10 se\fonds. Release the button and the router will go through its reboot pro\fess. Wait about 30 
se\fonds  to  a\f\fess  the  router. The  de\bault  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 recei\be e-mails when connecting through my router? 
I\b you are having a problem sending or re\feiving e-mail, or \fonne\fting to se\fure sites su\fh as eBay, banking sites, and Hotmail, 
we suggest lowering the MTU in in\frements o\b ten (e.g. 1492, 1482, 1472\l, et\f). 
Note: AOL DSL+ users must us\re \fTU of 1400. 
To find the proper MTU Size, you’ll have to do a spe\fial ping o\b the destination you’re trying to go to. A destination \fould be 
another \fomputer, or a URL. 
• Cli\fk on Start and then \fli\fk Run. 
• Windows
®  95,  98,  and  Me  users  type  in  command  (Windows®  NT,  2000,  and  XP  users  type  in  cmd)  and  press 
Enter (or \fli\fk OK). 
• On\fe the window opens, you’ll need to do a spe\fial ping. Use the \bollowing syntax: 
  ping [url] [-f ] [-l] [\fTU \balue] 
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 ea\fh time. On\fe you get a reply, go up by 2 until you get a \bragmented 
pa\fket. Take that value and add 28 to the value to a\f\fount \bor the various TCP/IP headers. For example, lets say that 1452 was the 
proper value, the a\ftual MTU size would be 1480, whi\fh is the optimum \bor the network we’re working with (1452+28=1480). 
On\fe you find your MTU, you \fan now \fonfigure your router with the proper MTU size. 
To \fhange the MTU rate on your router \bollow the steps below:
• Open your browser, enter the IP address o\b your router (192.168.0.1) a\lnd \fli\fk OK. 
•  Enter your username (admin) and password (blank by de\bault). Cli\fk  OK to enter the web \fonfiguration page 
\bor the devi\fe. 
•  Cli\fk on Setup and then \fli\fk \fanual Configure.  
•  To \fhange the MTU enter the number in th\le MTU field and \fli\fk Sa\be Settings to save your settings. 
•  Test your e-mail. I\b \fhanging the MTU does not resolve the problem, \fontinue \fhanging the MTU in in\frements 
o\b ten.  
						

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D-Link GO-RT-N150 User \fanual
Appendix A - Wireless Basics
D-Link  wireless  produ\fts  are  based  on  industry  standards  to  provide  easy-to-use  and  \fompatible  high-speed  wireless 
\fonne\ftivity within your home, business or publi\f a\f\fess wireless networks. Stri\ftly adhering to the IEEE standard, the D-Link 
wireless \bamily o\b produ\fts will allow you to se\furely a\f\fess the data you want, when and where you want it. You will be able 
to enjoy the \breedom that wireless networking delivers.
A wireless lo\fal area network (WLAN) is a \fellular \fomputer network that transmits and re\feives data with radio signals instead o\b 
wires. Wireless LANs are used in\freasingly in both home and offi\fe environments, and publi\f areas su\fh as airports, \foffee shops 
and universities. Innovative ways to utilize WLAN te\fhnology are helping people to work and \fommuni\fate more effi\fiently. 
In\freased mobility and the absen\fe o\b \fabling and oth\ler fixed in\brastru\fture have proven to be benefi\fial \bor many users. 
Wireless users \fan use the same appli\fations they use on a wired network.  Wireless adapter \fards used on laptop and desktop 
systems support the same proto\fols as Ethernet adapter \fards. 
Under many \fir\fumstan\fes, it may be desirable \bor mobile network devi\fes to link to a \fonventional Ethernet LAN in order to 
use servers, printers or an Internet \fonne\ftion supplied through the wired LAN.  A Wireless Router is a devi\fe used to provide 
this link.
What is Wireless?
Wireless or Wi-Fi te\fhnology is another way o\b \fonne\fting your \fomputer to the network without using wires. Wi-Fi 
uses radio \brequen\fy to \fonne\ft wirelessly, so you have the \breedom to \fonne\ft \fomputers anywhere in your home 
or offi\fe network.
Wireless Basics  
						

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Appendix A - Wireless Basics
Why D-Link Wireless? 
  
D-Link is the worldwide leader and award winning designer, developer, and manu\ba\fturer o\b networking produ\fts. 
D-Link delivers the per\borman\fe you need at a pri\fe you \fan afford. D-Link has all the produ\fts you need to build 
your network.
How does wireless work? 
  Wireless works similarly to how \fordless phones work; through radio signals transmitting data \brom point A to point B. 
However, wireless te\fhnology has restri\ftions as to how you \fan a\f\fess the network. You must be within the wireless 
network range area to be able to \fonne\ft your \fomputer. There are two different types o\b wireless networks: Wireless 
Lo\fal Area Network (WLAN), and Wireless Personal Area Network (WPAN).
Wireless Local Area Network (WLAN) In a wireless lo\fal area network, a devi\fe \falled an a\f\fess point (AP) \fonne\fts \fomputers to the network. The a\f\fess 
point has a small antenna atta\fhed to it, whi\fh allows it to transmit data ba\fk and \borth over radio signals. With an 
indoor a\f\fess point, the signal \fan travel up to 300 \beet. With an outdoor a\f\fess point the signal \fan rea\fh out up to 
30 miles to serve pla\fes like manu\ba\fturing plants, industrial lo\fations, \follege and high s\fhool \fampuses, airports, 
gol\b \fourses, and many other outdoor venues.
Wireless Personal Area Network (WPAN) Bluetooth is the industry standard wireless te\fhnology used \bor WPAN. Bluetooth devi\fes in WPAN operate with a 
range o\b up to 30 \beet.
The speed and wireless operation range o\b Bluetooth are both less than those o\b WLAN, but in return it doesn’t use 
nearly as mu\fh power whi\fh makes it ideal \bor personal devi\fes su\fh as mobile phones, PDAs, headphones, laptops, 
speakers, and other devi\fes that operate on batteries.  
						

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Appendix A - Wireless Basics
Who uses wireless? 
  
Wireless te\fhnology has be\fome so popular in re\fent years that almost everyone is using it, whether it’s \bor home, 
offi\fe, or business, D-Link has a wireless solution \bor it.
Home• Gives everyone at home broadband a\f\fess
•  Sur\b the web, \fhe\fk e-mail, send instant messages, et\f.
•  Eliminates the need \bor \fables around the house
•  Simple and easy to use
 
Small Office and Home Office • Stay on top o\b everything at home as you would in the offi\fe
•  Remotely a\f\fess your offi\fe network \brom home
•  Share Internet \fonne\ftion and printer with multiple \fomputers
•  No need to dedi\fate offi\fe spa\fe
 
Where is wireless used? 
   Wireless te\fhnology is expanding everywhere not just at home or in the offi\fe. People like the \breedom o\b mobility 
and  its  popularity  means  that  more  and  more  publi\f  \ba\filities  now  provide  wireless  a\f\fess  to  attra\ft  people. The 
wireless \fonne\ftion points in publi\f pla\fes are usually \falled “hotspots”.
Using a D-Link USB Adapter with your laptop, you \fan a\f\fess the hotspot to \fonne\ft to Internet \brom remote lo\fations 
su\fh as airports, hotels, \foffee shops, libraries, restaurants, and \fonvention \fenters.
Wireless  network  is  easy  to  setup,  but  i\b  you’re  installing  it  \bor  the  first  time  it  \fould  be  quite  a  task  not  knowing 
where to start. That’s why we’ve put together a \bew setup steps and tips to help you through the pro\fess o\b setting 
up a wireless network.  
						

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Appendix A - Wireless Basics
Tips
Here are a \bew things to keep in mind, when you install a wireless network.
Centralize Your Router or Access Point
   Make sure you pla\fe the router/a\f\fess point in a \fentralized lo\fation within your network \bor the best per\borman\fe. 
Try to pla\fe the router/a\f\fess point as high as possible in the room so the signal gets dispersed throughout your 
home. I\b you have a two-story home, you may need a repeater to boost the signal and extend the range.
Eliminate Interference 
   Pla\fe home applian\fes su\fh as \fordless telephones, mi\frowaves, and televisions as \bar away as possible \brom the 
router/a\f\fess point. This will signifi\fantly redu\fe any inter\beren\fe that applian\fes operating on the same \brequen\fy 
might \fause.
Security 
   Don’t let your next-door neighbors or i\lntruders \fonne\ft to your wireless network. Se\fure your wireless network by 
turning on the WPA or WEP se\furity \beature on the router. Re\ber to the produ\ft manual \bor detailed in\bormation on 
how to set it up.  
						

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Appendix A - Wireless Basics
There are two basi\f modes o\b net\lworking: 
• Infrastructure – All wireless \flients will \fonne\ft to an a\f\fess point or wireless router.
•  Ad-Hoc – Dire\ftly \fonne\fting to another \fomputer \bor peer-to-peer \fommuni\fation, using wireless network 
adapters on ea\fh \fomputer su\fh as two or more DWM-140 wireless network USB adapters.
An In\brastru\fture network \fontains an a\f\fess point or wireless router. All the wireless devi\fes, or \flients, will \fonne\ft to the 
wireless router or a\f\fess point. 
An ad-ho\f network \fontains only \flients, su\fh as laptops with wireless \fardbus adapters. All the adapters must be in Ad-Ho\f 
mode to \fommuni\fate.
Wireless Modes  
						

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Appendix B - Networking Basics
Networking Basics
Check your IP address
A\bter  you  install  your  adapter,  by  de\bault,  the TCP/IP  settings  should  be  set  to  obtain  an  IP  address  \brom  a  DHCP  server  (i.e. 
wireless router) automati\fally. To veri\by your IP address, please \bollow the steps below.
Cli\fk on Start > Run. In the run box type cmd and \fli\fk OK. (Windows Vista
® users type  in the Start Search box.)
At the prompt, type ipconfig and press Enter.
This will display the IP address, subnet mask, and the 
de\bault gateway o\b your adapter.
I\b the address is 0.0.0.0, \fhe\fk your adapter installation, 
se\furity  settings,  and  the  settings  on  your  router. 
Some firewall so\btware programs may blo\fk a DHCP 
request on newly ins\ltalled adapters.