3COM 3CR858-91 User Manual
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6 TROUBLESHOOTING

Basic Connection

Check that the Router is connected to your computers and to the

Checks

telephone line, and that all the equipment is powered on. Check that

 

the LAN Status LED and Cable/DSL Status LED on the Router are

 

illuminated, and that any corresponding LEDs on the NIC are also

 

illuminated.

 

Ensure that the computers have completed theirstart-upprocedure

 

and are ready for use. Some network interfaces may not be correctly

 

initialized until the start-upprocedure has completed.

 

If the LAN Status LED does not illuminate for a port that is connected,

 

check that you do not have a faulty cable. Try a different cable.

Browsing to the Router Configuration Screens

If 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 NIC are illuminated and indicating the same speed (10Mbps or 100Mbps).

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,Setting Up Your Computers. 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 (for example, 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 onInternet Options. Select the

92 CHAPTER6: TROUBLESHOOTING

Connections tab and click on theLAN 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 95/98/ME to verify that your computer has received the correct address information from the Router.

From the Start menu, chooseRun and then enterwinipcfg. Check that the computer has an IP address of the form 192.168.1.xxx (where xxx is in the range2-254),the subnet mask is 255.255.255.0, and the default Router address is 192.168.1.1. If these are not correct, use theRelease andRenew functions to obtain a new IP address from the Router.

Under Windows 2000 and Windows XP, use the ipconfig command-lineutility to perform the same functions.

Connecting to the

If you can browse to the Router configuration screens but cannot access

Internet

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 Status LEDs on both

 

Router and modem are illuminated.

 

Confirm that the connection between the modem and the cable/DSL

 

interface is OK.

 

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. Refer to “Internet

 

Settings” on page 42.

 

For DSL users, check that the PPPoE or PPTP user name, password and

 

service name are correct, if these are required. Only enter a PPPoE

 

service name if your ISP requires one.

 

For cable users, check whether your ISP requires a fixed MAC

 

(Ethernet) address or Host Name. If so, use the Hostname and MAC

 

Address screen in Internet settings to ensure that the correct Host

 

Name or MAC address is presented. Refer to “Hostname & MAC” on

 

page 50.

 

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 Defaults

93

Forgotten Password If you can browse to the Router configuration screen but cannot log inand Reset to because you do not know or have forgotten the password, follow theFactory Defaults steps below to reset the Router to it’s factory default configuration.

CAUTION: All your configuration changes will be lost, and you will need to run the configuration wizard again before you canre-establishyour 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 the reset would be convenient.

1Remove power from the Router.

2Disconnect all your computers and the cable/DSL modem from the Router.

3Using a straight through Ethernet cable, connect the Ethernet Cable/DSL port on the rear of the Router to any one of the LAN ports.

4Re-applypower to the Router. The Alert LED will flash as the Router starts up, and after approximately 30 seconds will start to flash more slowly (typically 2 seconds on, 2 seconds off). Once the Alert LED has started to flash slowly, remove power from the Router.

5Remove the cable connecting the Cable/DSL port to the LAN port, and reconnect one of your computers to one of the Router LAN ports.

6Re-applypower to the Router, and when thestart-upsequence has completed, browse to:

http://192.168.1.1

and run the Setup Wizard. You may need to restart your computer before you attempt this.

7When the Setup Wizard has completed, you may reconnect your network as it was before.

Alert LED

The Alert LED will flash when the Router unit is first powered up while

 

the system software checks the hardware for proper operation. Once the

 

Router has started normal operation, the Alert LED will go out.

 

If the Alert LED does not go out following start up, but illuminates

 

continuously, this indicates that the software has detected a possible

 

fault with the hardware. Remove power from the Router, wait 10

 

seconds and then re-applypower. If the Alert LED comes on

 

continuously again, then a fault has been detected. Locate the copy of

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the Router software on the accompanying CD-ROMor 3Com web site (http://www.3com.com) and upload it to the Router to see if this clears the fault (refer to “Recovering from Corrupted Software” below). If this does not fix the problem, contact your supplier for further advice.

During normal operation, you may notice the Alert LED lighting briefly from time to time. This indicates that the Router has detected a hacker

 

attack from the Internet and has prevented it from harming your

 

network. You need take no specific action on this, unless you decide

 

that these attacks are happening frequently in which case you may

 

wish to discuss this with your ISP. The Router logs such attacks, and

 

this information is available through the Status and Logs screens.

 

 

Power LED or

Check that your Router is receiving power by looking at the status of

Power Adapter OK

the Power LED on the front panel and the Power Adapter OK LED on

LED Not Lit

the rear panel:

 

If both LEDs are lit green then the unit is receiving power.

 

If both LEDs are unlit then no power is being supplied to the unit.

 

Check that the power adapter is plugged into a working mains

 

outlet and that the mains outlet is supplying power. If the mains

 

socket is supplying power then the power adapter or power

 

adapter connection may be faulty. See “Replacement Power

 

Adapters” below.

 

If the Power Adapter OK LED is lit but the Power LED is unlit then

 

there may be a fault with your unit. Contact 3Com Technical

 

Support.

 

Check that you are using the correct power adapter for your Router.

 

You should only use the power adapter supplied with your Router.

Replacement Power If both the Power Adapter OK LED and Power LED are off, check yourAdapters power adapter connection. If the mains outlet is working and is capable

of supplying power to other devices, contact 3Com Technical Support and ask for a replacement power adapter. Please quote the power adapter part number shown on the OfficeConnect power adapter you are using.

Alternatively, quote the part number for your region: