3Com 3CRWER100-75 Router Manual PDF (Setup & Configuration Guide)

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Forgotten Password and Reset to Factory Defaults

105

Forgotten Password

and Reset to

Factory Defaults

If 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 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 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.

1

Remove power from the Router.

2

Disconnect all your computers and the cable/DSL modem from the

Router.

3

Using a straight through Ethernet cable, connect the Ethernet Cable/DSL

port on the rear of the Router to any one of the LAN ports.

4

Re-apply power 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.

5

Remove the cable connecting the Cable/DSL port to the LAN port, and

reconnect one of your computers to one of the Router LAN ports.

6

Re-apply power to the Router, 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.

7

When the configuration wizard has completed, you may reconnect your

network as it was before.

Wireless

Networking

■

Ensure that you have an 802.11b or 802.11g wireless adapter for

each wireless computer, and that it is correctly installed and

configured. Verify that each Wireless computer has either Windows

95 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.

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ROUBLESHOOTING

■

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 Router Wireless LED, it should be lit if wireless

is enabled and will flash when there is wireless activity. If not lit go to

“Wireless Settings”

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 can

simultaneously support WPA and WEP encryption, but can only

support one configuration of each.

■

Ensure that you have the Wireless computer enabled in the list of

allowed MAC addresses if you are using Wireless Connection control

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. 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 unsure try

relocating both the wireless computers and the Router to establish

whether this problem exists.

■

Most wireless computer Adapters will scan the channels for the

wireless Router. If a wireless computer has not located the Router then

try initiating a search manually if the client software supports this

feature or manually set the channel on your wireless computer to

correspond to the Router channel number. Please refer to your

Wireless computer adapter documentation and vendor to do this.

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Power LED or Power Adapter OK LED Not Lit

107

■

Speed of connection: The 802.11b and 802.11g standards will

automatically choose the best speed depending on the quality of your

connection. As the signal quality weakens then the speed falls back to

a lower speed. The speeds supported by 802.11g are 54 Mbps,

48 Mbps, 36 Mbps, 24 Mbps, 18 Mbps, 12 Mbps, and 6 Mbps. The

speeds supported by 802.11b are 11 Mbps, 5.5 Mbps, 2 Mbps and

1 Mbps. In general the closer you are to the Router the better the

speed. If you are not achieving the speed you had anticipated then try

moving the antenna on the Router or moving the Wireless computer

closer to the Router. In an ideal network the Router should be located

in the centre of the network with Wireless computers distributed

around it. Applications are generally available with the computer

wireless card to carry out a site survey. Use this application to find the

optimal siting for your wireless computer. Consult your Computer

Card documentation and vendor for more details.

Power LED or

Power Adapter OK

LED Not Lit

■

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

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

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

Adapters

If both the Power Adapter OK LED and Power LED are off, check your

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.

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Alternatively, quote the part number for your region:

Power Adapter Part Numbers

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-apply power. If the Alert LED comes on

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

the Router software on the accompanying CD-ROM or 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.

Recovering from

Corrupted Software

If the Alert LED remains permanently on following power-up, it is possible

that the system software has become corrupted. In this condition, the

Part Number

Region

3C16760

US and Canada

3C16761

UK

3C16762

Europe and Middle East

3C16763

Australasia (except Japan and Korea)

3C16764

South Africa

3C16766

Japan

3C16767

Korea

3C16768

Argentina

Page 95 / 128

Frequently Asked Questions

109

Router will enter a “recovery” state; DHCP is disabled, and the LAN IP

address is set to 192.168.1.1. Follow the instructions below to upload a

new copy of the system software to a Router unit in this state.

Ensure that one of your computers has a copy of the new software image

file stored on its hard disk or available on CD-ROM.

The latest software is available on 3Com’s Web site at:

www.3com.com

.

1

Remove power from the Router and disconnect the Cable/DSL modem

and all your computers, except for the one computer with the software

image.

2

You will need to reconfigure this computer with the following static IP

address information:

■

IP address: 192.168.1.2

■

Subnet mask: 255.255.255.0

■

Default Router address: 192.168.1.1

3

Restart the computer, and re-apply power to the Router.

4

Using the Web browser on the computer, enter the following URL in the

location bar:

http://192.168.1.1

.

This will connect you to the Microcode Recovery utility in the Router.

5

Follow the on-screen instructions. Enter the path and filename of the

software image file.

6

When the upload has completed, the Router will restart, run the self-test

and, if successful, resume normal operation. The Alert LED will go out.

7

Refer to the Installation Guide to reconnect your Router to the Cable/DSL

modem and the computers in your network. Do not forget to reconfigure

the computer you used for the software upload.

If the Router does not resume normal operation following the upload, it

may be faulty. Contact your supplier for advice.

Frequently Asked

Questions

How do I reset the Router to Factory Defaults?

See

“

Forgotten Password and Reset to Factory Defaults

”

.

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