3Com Router WL-602 User Manual

							System Tools119
TracerouteTraceroute is the program that shows you the route over the network 
between two systems, listing all the intermediate routers a connection 
must pass through to get to its destination. It can help you determine 
why your connections to a given server might be poor, and can often help 
you figure out where exactly the problem is. It also shows you how 
systems are connected to each other, letting you see how your ISP 
connects to the Internet as well as how the target system is connected.
Figure 101   Traceroute Screen
1Enter the IP address or domain name in the IP Address or Domain Name 
field, and click Tr a c e r o u t e. 
2The Router keeps a log of the traceroute test, click Clear Log to delete the 
records.  
						

							120CHAPTER 5: CONFIGURING THE ROUTER
DNS LookupDNS Lookup is the process of resolving an IP address
(i.e. 192.168.11.137) to a host name (i.e. xxxcompany.net). 
Figure 102   DNS Lookup Screen
1Enter the IP address or domain name in the IP Address or Domain Name 
field, and click Dns lookup. 
2The Router keeps a log of the DNS lookup test, click Clear Log to delete 
the records. 
DiagnosticThis screen is designed to collect diagnostic information of this Router, 
click the Start button to start the diagnostic, then save the information in 
a file. You can later use this information to analyze your network. 
Figure 103   Diagnostic Screen 
						

							Status and Logs121
Status and LogsYou can use the Status Screen to view version numbers for your Router’s 
software and hardware and check the status of connections to WAN, 
LAN and WLAN interfaces.
StatusThis screen shows Router status and statistics.
■Release - use this button to release the current IP. 
■Renew - use this button to obtain a new IP. 
Figure 104   Status Screen 
						

							122CHAPTER 5: CONFIGURING THE ROUTER
Routing TableThis screen displays details for the default routing used by your Router 
and any routing created using Static Routing or RIP.
Figure 105   Routing Table Screen
LogsThis screen shows any attempts that have been made to gain access to 
your network as well as the system activities.
Figure 106   Logs Screen
■Click Help to view the help file.
■Click Save to save the log to the hard disk as a text file. When 
prompted for a location to save the file to, specify a filename and 
location, and then click OK.
■Click Clear to clear the log (note that all current entries will be erased).
■Click Refresh to update the record. 
						

							Status and Logs123
Traffic StatisticsThis screen shows the traffic statistics. Use the Refresh button to update 
the information. Note that the current implementation only shows traffic 
statistics per forwarding group. Hence if QoS is not enabled, this screen 
will always show zero values.
Figure 107   Traffic Statistics Screen  
						

							124CHAPTER 5: CONFIGURING THE ROUTER
Support/FeedbackYou can use the Support/Feedback screen to obtain support and help, 
and also provide feedback to 3Com. 
Support
Figure 108   Support Screen
This screen shows support information.
FeedbackTo provide feedback to 3Com, please click Provide Feedback, and this will 
connect you to the 3Com Web site.
Figure 109   Feedback Screen
This screen shows feedback information. 
						

							6
TROUBLESHOOTING
Basic Connection 
ChecksThe Router has been designed to aid you when detecting and solving 
possible problems with your network. These problems are rarely serious; 
the cause is usually a disconnected or damaged cable, or incorrect 
configuration. If this section does not solve your problem, contact your 
supplier for information on what to do next.
Perform these actions first:
■Ensure all network equipment is powered on.
■Power each piece of network equipment off, wait about five seconds 
and then power each one on.
CAUTION: Do not power the Router off and then immediately on. Wait 
about five seconds between power cycles.
Check the following symptoms and solutions:
■Check that the Router is connected to your computers and to the 
cable/DSL modem, and that all the equipment is powered on. Check 
that the LAN Status and power LEDs on the Router are illuminated, 
and that any corresponding LEDs on the NIC are also illuminated.
■Ensure that the computers have completed their start-up procedure 
and are ready for use. Some network interfaces may not be correctly 
initialized until the start-up procedure has completed.
■If the link status LED does not illuminate for a port that is connected, 
check that you do not have a faulty cable. Try a different cable.
■Port Status LED not lit for a port that has a TP cable connected. After 
connection, it may take several seconds for the Port Status LEDs to 
illuminate. The Port Status LED should turn Blue, for each port that is 
connected. If the Port Status LED is not lit after several seconds, ensure 
that the connected device is powered on, that the TP cable is not  
						

							126CHAPTER 6: TROUBLESHOOTING
damaged and that it is correctly inserted at both ends. You may find 
that a TP cable works when connected to the Router, but does not 
work if disconnected from the Router and connected to another 
device. This may be because the other device does not have the 
automatic MDI/MDIX feature.
Browsing to the 
Router 
Configuration 
ScreensIf you have connected your Router and computers together but cannot 
browse to the Router configuration screens, check the following:
■Confirm that the physical connection between your computer and the 
Router is OK, and that the LAN Status LEDs on the Router and 
network adapter are illuminated. Some NICs do not have status LEDs, 
in which case a diagnostic program may be available that can give you 
this information.
■Ensure that you have configured your computer as described in 
Chapter 3
. Restart your computer while it is connected to the Router 
to ensure that your computer receives an IP address.
■When entering the address of the Router into your web browser, 
ensure that you use the full URL including the http:// prefix (e.g. 
http://192.168.1.1).
■Ensure that you do not have a Web proxy enabled on your computer. 
Go to the Control Panel and click on Internet Options. Select the 
Connections tab and click on the LAN Settings button at the bottom. 
Make sure that the Proxy Server option is unchecked.
■If you cannot browse to the Router, use the winipcfg utility in 
Windows 98/ME to verify that your computer has received the correct 
address information from the Router. From the Start menu, choose 
Run and then enter winipcfg. Check that the computer has an IP 
address of the form 192.168.1.xxx (where xxx is in the range 2-254), 
the subnet mask is 255.255.255.0, and the default Router is 
192.168.1.1 (the address of the Router). If these are not correct, use 
the Release and Renew functions to obtain a new IP address from the 
Router. Under Windows 2000, Windows XP, and Windows Vista use 
the ipconfig command-line utility to perform the same functions. 
						

							Connecting to the Internet127
Connecting to the 
InternetIf you can browse to the Router configuration screens but cannot access 
Web sites on the Internet, check the following:
■Confirm that the physical connection between the Router and the 
cable/DSL modem is OK, and that the Cable/DSL LED on the Router is 
illuminated.
■Ensure that you have entered the correct information into the Router 
configuration screens as required by your Internet Service Provider. Use 
the Internet Settings screen to verify this.
■Check that the PPPoE, or L2TP, or PPTP user name and password are 
correct.
■Ensure that your computers are not configured to use a Web proxy. 
On Windows computers, this can be found under Control Panel > 
Internet Options > Connections.
Forgotten Password 
and Reset to 
Factory DefaultsIf you can browse to the Router configuration screen but cannot log on 
because you do not know or have forgotten the password, follow the 
steps below to reset the Router to its factory default configuration. 
CAUTION: All your configuration changes will be lost, and you will need 
to run the configuration wizard again before you can re-establish your 
Router connection to the Internet. Also, other computer users will lose 
their network connections whilst this process is taking place, so choose a 
time when this would be convenient.
1Power off the Router.
2Disconnect all your computers and the telephone line from the Router.
3Re-apply power to the Router, and wait for it to finish booting up.
4Press and hold the Reset button on the rear panel (see Figure 4 on 
page 17) for 5 seconds.
5The Router will restart, and when the start-up sequence has completed, 
browse to: 
http://192.168.1.1 
and run the configuration wizard. You may need to restart your computer 
before you attempt this.
6When the configuration wizard has completed, you may reconnect your 
network as it was before. 
						

							128CHAPTER 6: TROUBLESHOOTING
Wireless 
Networking■Ensure that you have an 802.11b or 802.11g or 802.11n wireless 
adapter for each wireless computer, and that it is correctly installed 
and configured. Verify that each wireless computer has either 
Windows 98 or higher or MAC OS 8.5 or higher.
■Verify that your wireless computers are configured to work in 
Infrastructure mode and not Ad Hoc mode. The Router contains an 
Access Point that is designed to operate in Infrastructure mode. Ad 
Hoc mode is not supported by the Router.
■If you have a wired and a wireless NIC in the same computer, ensure 
that the wired NIC is disabled.
■Check the status of the WLAN LED, it should be lit if wireless is 
enabled and will flash when there is wireless activity. If not lit go to 
Wireless Settings on page 55 and enable wireless networking.
■Ensure that the TCP/IP settings for all devices are correct.
■Ensure that the Wireless Clients are using the same SSID or Service 
Area Name as the Router. The SSID is case-sensitive.
■Ensure that the encryption method and level that you use on your 
clients are the same as those configured on the Router. The Router 
cannot simultaneously support WPA and WEP encryption.
■Ensure that you have the wireless computer enabled in the list of 
allowed MAC addresses if you are using MAC Address Filtering on the 
Router. 
■If you are having difficulty connecting or are operating at a low speed 
try changing the antenna positions on the rear of the Router. 
For more effective coverage you can try reorientating your antennae. 
Place one antenna vertically and one horizontally to improve coverage. 
Additionally consider moving the wireless computer closer to the 
Router to confirm that the building structure or fittings are not 
adversely affecting the connectivity. If this resolves the problem 
consider relocating the wireless computer or the Router, or trying a 
different channel on the Router.
■Sources of interference: The 2.4Ghz ISM band is used for 802.11b and 
802.11g and 802.11n. This is generally a licence free band for low 
power applications, and you may have other devices at your location 
that operate in this frequency band. You should take care to ensure 
that there are no devices, like microwave ovens for example, close to 
the Router or wireless computers as this could affect receiver 
sensitivity and reduce the performance of your network. If you are