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Wireless Networking
129
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.
■
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.
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Page 132 / 172
130
C
HAPTER
6: T
ROUBLESHOOTING
Recovering from
Corrupted Software
If the system software has become corrupted, the Router will enter a
“recovery” state; DHCP is enabled, 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.
Check on www.3com.com for the latest version firmware.
1
Remove power from the Router and disconnect from DSL or Cable
modem and all your computers, except for the one computer with the
software image.
2
You will need to reconfigure this computer to obtain an IP address
automatically (see
Obtaining an IP Address Automatically
on page 23).
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:
.
This will connect you to the 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.
7
Refer to the Installation Guide to reconnect your Router to the telephone
line 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.
Power Adapter
Power Status Logo not lit.
This is probably because the switch does not have power. Check the
following:
■
Make sure the power lead from the power adapter is properly
connected and the cord is not damaged.
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Page 133 / 172
Power Adapter
131
■
Ensure the power adapter is correctly fitted into the power outlet
socket and that the socket switch is turned on if applicable.
■
Ensure you are using only the 3Com power adapter supplied with the
Router.
If there is still no power, contact 3Com Technical Support and ask for
assistance
Caution:
Only use the power adapter supplied with the Router or a
replacement 3Com power adapter. Do not use any other power adapter.
For reference, the part number for the power adapter supplied for your
region is:
3Com Number
Region
3C12VUS
US and Canada
3C12VUK or 3C15VUK
UK
3C12VME or 3C15VME
Europe and Middle East
3C12VAA
Australasia (except Japan and Korea)
3C12VSA
South Africa
3C12VKR
Korea
3C12VRA
Argentina
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Page 134 / 172
132
C
HAPTER
6: T
ROUBLESHOOTING
Frequently Asked
Questions
How do I reset the Router to Factory Defaults?
See
Forgotten Password and Reset to Factory Defaults
on
page 127
.
How many computers on the LAN does the Router support?
Up to a maximum number of 253 total users on the LAN are
supported. Please note that the maximum number of users
supported will be vary depending on the amount of traffic that
each user generates.
How many wireless clients does the Router support?
Up to 32 wireless clients are supported. Please note that the total
practical number of wireless users depends on the network
environment and the amount of bandwidth consumed by each
user.
There are only 4 LAN ports on the Router. How are additional
computers connected?
You can expand the number of connections available on your LAN
by using hubs, switches and wireless access points connected to
the Router. 3Com wireless access points and hubs and switches
provide a simple, reliable means of expanding your network;
contact your supplier for more information, or visit:
Does the Router support virtual private networks (VPNs)?
The Router supports both VPN passthrough and VPN
initiation/termination. VPN initiation/termination is useful when
you need to establisha secure site-to-site communication or make
your network accessible to remote teleworkers.
VPN passthrough is used when you are connected to 3Com Router
and access the corporate network from your laptop with VPN
client."
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Page 135 / 172
A
IP A
DDRESSING
The Internet
Protocol Suite
The Internet Protocol suite consists of a well-defined set of
communications protocols and several standard application protocols.
Transmission Control Protocol/Internet Protocol (TCP/IP) is probably the
most widely known and is a combination of two of the protocols (IP and
TCP) working together. TCP/IP is an internationally adopted and
supported networking standard that provides connectivity between
equipment from many vendors over a wide variety of networking
technologies.
Managing the
Router over the
Network
To manage a device over the network, the Router must be correctly
configured with the following IP information:
■
An IP address
■
A Subnet Mask
IP Addresses and
Subnet Masks
Each device on your network must have a unique IP address to operate
correctly. An IP address identifies the address of the device to which data
is being sent and the address of the destination network. IP addresses
have the format n.n.n.x where n is a decimal number between 0 and 255
and x is a number between 1 and 254 inclusive.
However, an IP address alone is not enough to make your device operate.
In addition to the IP address, you need to set a subnet mask. All networks
are divided into smaller sub-networks and a subnet mask is a number
that enables a device to identify the sub-network to which it is
connected.
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