Internet Settings 61
■ Use this PC’s MAC address - This field is automatically filled in with the
MAC address of the PC you are using to configure the Gateway. You
should use this address only if you were previously using this
computer to connect directly to your modem.
■ Enter a new MAC address manually - Use this option if you want to
specify a new MAC address. Enter the new MAC address.
5 Check all settings and click Apply.
PPP over Ethernet
Figure 43 PPPoE Setup Screen
To setup the Gateway for use with a PPP over Ethernet connection, use
the following procedure:
1 Select PPP over Ethernet in the IP Allocation Mode field. (Figure 43
)
2 Enter your Primary DNS Address and Secondary DNS address.
Your ISP may provide you with primary and secondary DNS addresses. If
they have been provided, enter the addresses in the appropriate text
boxes. If not, leave 0.0.0.0 in the boxes.
3 Enter the Host Name (optional).
Some ISPs require a host name. If your ISP has this requirement, enter the
host name in the Host Name text box.
4 Enter your PPP over Ethernet user name in the PPPoE User Name text box.
5 Enter a password in the PPPoE Password text box.
62 CHAPTER 5: GATEWAY CONFIGURATION
6 Enter your PPP over Ethernet service name in the PPPoE Service Name text
box. Not all ISPs require a PPPoE service name. Only enter a service name
if your ISP requires this.
7 Select an idle time from the Maximum Idle Time drop-down list.
This value will correspond to the amount of idle time (no Internet activity)
that will pass before the Gateway automatically ends your PPP over
Ethernet session.
Since the Gateway contains its own PPPoE client, you no longer need to
run PPPoE client software on your computer to access the Internet.
PPTP
Figure 44 PPTP Setup Screen
To setup the Gateway for use with a PPTP connection, use the following
procedure:
1 Select PPTP (used by some European providers) in the IP Allocation Mode
field. (Figure 44
)
2 Enter your PPTP server address in the PPTP Server Address text box (this is
typically the address of your modem).
3 Enter your PPTP user name in the PPTP User Name text box.
4 Enter your password in the PPTP Password text box.
Firewall 63
5 Enter your Primary DNS Address and Secondary DNS address.
Your ISP may provide you with primary and secondary DNS addresses. If
they have been provided, enter the addresses in the appropriate text
boxes. If not, leave 0.0.0.0 in the boxes.
6 Select an idle time from the Maximum Idle Time drop-down list.
This value will correspond to the amount of idle time (no Internet activity)
that will pass before the Gateway automatically ends your PPTP session.
7 IP settings must be used when establishing a PPTP connection. Fill in the
Initial IP Address and the Initial Subnet Mask fields if your ISP has
provided you with these settings. Alternatively, if the PPTP server is
located in your DSL modem, click Suggest to select an IP address on the
same subnet as the PPTP server.
Firewall On the main frame of the Firewall setup screen is a menu with five tabs:
Virtual Servers, Special Applications, PCs Privileges, URL Filter, and
Security.
Virtual Servers Selecting the Firewall option on the main menu displays the Virtual
Servers setup screen. (Figure 45
)
Virtual DMZ
Figure 45 Virtual Servers Screen
64 CHAPTER 5: GATEWAY CONFIGURATION
DMZ (De-Militarized Zone) Host is a computer without the protection of
the firewall. This feature allows a single computer to be exposed to
unrestricted 2-way communication from outside of your network. This
feature should be used only if the Virtual Server or Special Applications
options do not provide the level of access needed for certain applications.
To configure one of your computers as a DMZ host, enter the last digit(s)
of the IP address of the computer in the IP Address of DMZ Host text box,
and then click Apply.
Virtual Server
Activating and configuring a virtual server allows one or more of the
computers on your network to function as a public server. For example,
one of your computers could be configured as an FTP server, allowing
others outside of your office network to download files of your choosing.
Or, if you have created a Web site, you can configure one of your
computers as a Web server, so that others can view your Web site.
To configure a virtual server:
1 Click New on the right side of the screen to open the Virtual Server
Settings dialogue box. (Figure 46
)
2 Enter the last digit(s) of the IP address of the computer in the Server IP
Address text box.
3 Select the Service from the pull-down list. (Figure 46
Figure 46 Virtual Servers Settings Screen
)
Firewall 65
Or select Custom to specify a suitable name for the service and then enter
the port numbers required for that service. (Figure 47
Figure 47 Custom Setup Screen
)
4 Click Add to save the settings.
The port numbers are specified using a comma-separated list, with
hyphens to denote port number ranges. So for example, entering 2, 3,
5-7 would cause ports 2, 3, 5, 6, and 7 to be activated.
Special Applications
Figure 48 Special Applications Screen
Select Special Applications tab to display Authorized Application setup
screen. (Figure 48
)
Some software applications require special or multiple connections to the
Internet and these would normally be blocked by the firewall. For
example Internet Telephony or Video conferences require multiple
connections.
So that these special applications can work properly and are not blocked,
the firewall needs to be told about them. In each instance there will be a
66 CHAPTER 5: GATEWAY CONFIGURATION
trigger port and incoming port(s), where traffic on the trigger port tells
the firewall to open the incoming ports.
Each defined Special Application only supports a single computer user,
and up to 10 Special Applications can be defined. Any incoming ports
opened by a Special Application trigger will be closed after five minutes
of inactivity.
To configure special applications:
1 Click New.
2 Select the applications from the pull-down list. (Figure 49
Figure 49 Special Application Settings Screen
)
Or select Other to specify a suitable name for the special application and
then enter a value in the Trigger Port and Incoming Ports text boxes
(Figure 49
). These values correspond to the outbound port numbers
issued by the application.
The port numbers are specified using a comma-separated list, with
hyphens to denote port number ranges. So for example, entering 2, 3,
5-7 would cause ports 2, 3, 5, 6, and 7 to be activated.
The Gateway will automatically allow FTP and NetMeeting sessions. You
do not need to configure these as Special Applications.
Firewall 67
PC Privileges
Figure 50
Other Applications Setup Screen
3 Click Add to save your settings.
Only one computer on your network can use the special application at
any one time.
Figure 51 PC Privileges Screen
Select PC Privileges to display the PC Privilege setup screen (Figure 51).
Access from the local network to the Internet can be controlled on a
computer-by-computer basis. In the default configuration the Gateway
will allow all connected computers unlimited access to the Internet.
PC Privileges allows you to assign different access rights for different
computers on your network.
68 CHAPTER 5: GATEWAY CONFIGURATION
To use access control for all computers:
1 Click PCs access authorized services only.
2 Select All PCs to setup the access rights for all computers connected to
the Gateway.
3 Select authorized services by clicking in the appropriate check box(es)
(Figure 52
Figure 52 All PCs Setup Screen
).
In addition to the four authorized services listed, you can choose to allow
or block access to other services. You can either:
■ Allow all other services with exceptions, or
■ Block all other services with exceptions
4 To do this, select Allow or Block from the drop down menu and enter the
exceptions into the text box.
The port numbers are specified using a comma-separated list, with
hyphens to denote port number ranges. So for example, entering 2, 3,
5-7 would cause ports 2, 3, 5, 6, and 7 to be activated.
For example, to block access to all services except Web (80) and a service
that uses ports 2,3,5,6 and 7:
1. Tick the Web(80) check box.
2. Select ‘Block’ all other services.
3. Enter ‘2, 3, 5-7’ in the ‘except (specify ports) box. See Figure 53
.
Firewall 69
Figure 53 PC Privileges Setup Screen Example
5 Click Modify to save the settings or Close to discard them.
To assign different access rights for different computers:
1 If not already selected, click PCs access authorized services only.
2 Click New to display the PC Privileges setting screen.
3 Enter the last digit(s) of the IP address of the computer in the PC’s IP
Address text box.
4 Select authorized services by clicking in the appropriate check box(es).
In addition to the four authorized services listed, you can choose to allow
or block access to other services. You can either:
■ Allow all other services with exceptions, or
■ Block all other services with exceptions
See step 4 of the previous section for more details.
5 Click Add to save the settings.
URL Filter Select URL Filter to control your clients’ access to Web sites. The
Gateway’s URL Filter has three settings:
■ Disabled — Users can browse all Web sites. None will be filtered.
■ Deny List — Users can browse all Web sites apart from those sites
listed in the deny list and those whose URLs contain keywords listed in
the deny list. See “
■ Allow List — Users are unable to browse any Web sites except of
Deny List” on page 70.
those listed in the allow list and those whose URLs contain keywords
listed in the allow list. See “
Allow List” on page 71.
70 CHAPTER 5: GATEWAY CONFIGURATION
Deny List
To allow users access to all Web sites except for those you choose to
block, choose Deny List in the URL Filter Type drop-down box (Figure 54
Figure 54 URL Filter Screen showing Deny List
).
To filter a specific site, enter the URL for that site. For example, to stop
your users from browsing a site called www.badsite.com, enter
www.badsite.com or badsite.com in one of the fields.
If badsite.com has multiple sub-domains, such as this.badsite.com and
that.badsite.com then you can either:
■ Block them individually by entering this.badsite.com in one field
and that.badsite.com in another.
or
■ Block them by entering the keyword badsite.com into one of the
fields. This will block all URLs containing the string badsite.com. As
well as blocking this.badsite.com and that.badsite.com,
the keyword badsite.com would block searches that mentioned
badsite.com in their domain name, for example
www.notabadsite.com.
To filter a generic keyword enter it into one of the fields. You should
exercise caution when choosing a keyword as many keywords are
Firewall 71
contained within other words. For example, filtering the word sex would
filter the following example URLs:
■ www.sussex.com
■ www.thisexample.com
You can filter up to 30 keywords and URLs.
Computers that should not be subject to URL filtering can be excluded by
ticking the Bypass URL Filter checkbox in the PC Privileges setup screen.
PC Privileges” on page 67.
See “
Allow List
To stop users from accessing any Web sites that you have not specifically
allowed, choose Allow List in the URL Filter Type drop-down box
(Figure 55
Figure 55 URL Filter Screen showing Allow List
).
To allow a specific site, enter the URL for that site. For example, to let
your users browse a site called www.goodsite.com, enter
www.goodsite.com or goodsite.com in one of the fields.
If goodsite.com has multiple sub-domains, such as
this.goodsite.com and that.goodsite.com then you can
either:
72 CHAPTER 5: GATEWAY CONFIGURATION
■ Allow them individually by entering this.goodsite.com in one
field and that.goodsite.com in another.
or
■ Allow them by entering the keyword goodsite.com into one of the
fields. This will allow all URLs containing the string goodsite.com.
As well as allowing this.goodsite.com and
that.goodsite.com, the keyword goodsite.com would allow
sites that had the string goodsite.com in their URL, for example
xxxgoodsite.com.
To filter a generic keyword enter it into one of the fields. You should
exercise caution when choosing a keyword as sites that you may wish to
block may be allowed if you choose too general a keyword.
The Gateway filters all traffic from domains that have been blocked using
the URL filter. If need to access an external mail server, FTP server or other
named device outside your network, you must list it in one of the allow
fields.
You can filter up to 30 keywords and URLs.
Computers that should not be subject to URL filtering can be excluded by
ticking the Bypass URL Filter checkbox in the PC Privileges setup screen.
PC Privileges” on page 67.
See “
Security Select Security to display the Security screen (Figure 56).
Figure 56 Security Screen
Firewall 73
The Internet connects millions of computer users throughout the world.
The vast majority of the computer users on the Internet are friendly and
have no intention of breaking into, stealing from, or damaging your
network. However, there are hackers who may try to break into your
network.
Enable universal plug and play Universal plug and play allows
compatible software to read and change some the Gateway’s firewall
settings. This reduces the configuration required but lessens your control
of the Gateway’s firewall.
3Com recommends that you leave this feature disabled for maximum
security.
Allow PING from the Internet PING is a utility, which is used to
determine whether a device is active at the specified IP address. PING is
normally used to test the physical connection between two devices, to
ensure that everything is working correctly.
By default the Gateway has PING disabled in order to make the device
more difficult to find on the Internet and less prone to attack.
74 CHAPTER 5: GATEWAY CONFIGURATION
This feature is enabled by clicking on the check box so that a tick can be
seen and then select Apply.
3Com recommends that you leave this disabled.
Enabling Remote Administration
It is possible to administer the Gateway remotely. This can be set to one
of four different levels using the following options:
1 Disable Remote Administration - This option is set as default.
2 Enable administration from a single Internet Host - Only the specified IP
address can manage the Gateway. Any other users will be rejected.
3 Enable administration from a whole subnet - This option allows a
number of users within a subnet to administer the Gateway.
4 Enable administration from any Internet Host - This options allows any
host to access the administration pages.
To remotely administer your Gateway, enter
http://xxx.xxx.xxx.xxx:8000 in the location bar of the browser
running on the remote computer, where xxx.xxx.xxx.xxx is the Internet IP
address of the Gateway. You may then login using the administration
password.
Your Internet IP address can be found at the bottom of the screen. See
Figure 56
.
System Tools 75
System Tools The main frame of the System Tools screen includes four administration
items: Restart, Time Zone, Configuration, and Upgrade (Figure 57
).
Restart
Figure 57 Restart Screen
If your Gateway is not operating correctly, you can choose to restart the
Gateway by selecting Restart the Gateway, simulating the effect of
power cycling the unit. No configuration information will be lost but the
log files will be erased. This function may be of use if you are
experiencing problems and you wish to re-establish your Internet
connection. Any network users who are currently accessing the Internet
will have their access interrupted whilst the restart takes place, and they
may need to reboot their computers when the restart has completed and
the Gateway is operational again.
76 CHAPTER 5: GATEWAY CONFIGURATION
Time Zone Figure 58 Time Zone Screen
Choose the time zone that is closest to your actual location. The time
zone setting is used by the system clock when displaying the correct time
in the log files.
If you use Daylight saving tick the Enable Daylight savings box, and then
click Apply (Figure 58
).
The Gateway reads the correct time from NTP servers on the Internet and
sets its system clock accordingly. The Daylight Savings option merely
advances the system clock by one hour. It does not cause the system
clock to be updated for daylight savings time automatically.
Configuration Figure 59 Configuration Screen
Select the Configuration tab to display the Configuration screen
(Figure 59
).
System Tools 77
Backup Configuration
Click BACKUP to save the current Gateway configuration. You will be
prompted to download and save a file to disk.
Restore Configuration Data
If you want to reinstate the configuration settings previously saved to a
file, press Browse to locate the backup file on your computer, and then
click RESTORE to copy the data into the Gateway's memory.
The password will remain unchanged.
Reset to Factory Default
If you want to reset the settings on your Gateway to those that were
loaded at the factory, click RESET. You will lose all your configuration
changes. The Gateway LAN IP address will revert to 192.168.1.1, and the
DHCP server on the LAN will be enabled. You may need to reconfigure
and restart your computer to re-establish communication with the
Gateway.
78 CHAPTER 5: GATEWAY CONFIGURATION
Upgrade Figure 60 Upgrade Screen
The Upgrade facility allows you to install on the Gateway any new
releases of system software that 3Com may make available. To install
new software, you first need to download the software from the 3Com
support web site to a folder on your computer. Once you have done this,
select Browse to tell your web browser where this file is on your
computer, and then click Apply. The file will be copied to the Gateway,
and once this has completed, the Gateway will restart. Although the
upgrade process has been designed to preserve your configuration
settings, it is recommended that you make a backup of the configuration
beforehand, in case the upgrade process fails for any reason (for
example, the connection between the computer and the Gateway is lost
while the new software is being copied to the Gateway).
The upgrade procedure can take up to two minutes, and is complete
when the Alert LED has stopped flashing and is permanently off. Make
sure that you do not interrupt power to the Gateway during the upgrade
procedure; if you do, the software may be corrupted and the Gateway
may not start up properly afterwards. If the Alert LED comes on
continuously after a failed upgrade, refer to Chapter 6
Troubleshooting”.
“
,
Status and Logs Selecting Status and Logs from the main menu displays the Status, Usage,
and Logs screens in your Web browser window.
Status and Logs 79
Status The Status screen displays a tabular representation of your network and
Internet connection. (Figure 61
Figure 61 Status Screen
)
Usage Usage displays an approximate count of the traffic since the Gateway was
last reset. (Figure 62
)
The counts are approximate and should be used as a guide only. Contact
your ISP for accurate logging information.
80 CHAPTER 5: GATEWAY CONFIGURATION
Figure 62 Usage Screen
Logs Logs will allow you to view both the normal events, and security threats
logged by the Gateway.
Figure 63 Logs Screen
You may be asked to refer to the information on the Status and Logs
screens if you contact your supplier for technical support.
Support/Feedback Selecting Support/Feedback from the main menu displays the Support
and Feedback screens.
Support Figure 64 Support Screen
Selecting the Support option on the main menu displays the support links
screen, which contains a list of Internet links that provide information and
support concerning the Gateway (Figure 64
Support/Feedback 81
).
Feedback
Figure 65 Feedback Screen
82 CHAPTER 5: GATEWAY CONFIGURATION
Selecting the Feedback option displays the Feedback screen and allows
you to provide feedback to 3Com on the operation of your Gateway
(Figure 65
). This screen should not be used to obtain technical support.
6
TROUBLESHOOTING
Basic Connection
Checks
Browsing to the
Gateway
Configuration
Screens
■ Check that the Gateway 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 Cable/DSL Status LEDs on the Gateway are
illuminated, and that any corresponding LEDs on the cable/DSL
modem and 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.
If you have connected your Gateway and computers together but cannot
browse to the Gateway configuration screens, check the following:
■ Confirm that the physical connection between your computer and the
Gateway is OK, and that the LAN Status LEDs on the Gateway 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
is connected to the Gateway to ensure that your computer receives an
IP address.
, Setting Up Your Computers. Restart your computer while it
■ When entering the address of the Gateway 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
84 CHAPTER 6: TROUBLESHOOTING
■ If you cannot browse to the Gateway, use the winipcfg utility in
■ If you still cannot browse to the Gateway, then use the Discovery
Connections tab and click on the LAN Settings button at the bottom.
Make sure that the Proxy Server option is unchecked.
Windows 95/98/ME to verify that your computer has received the
correct address information from the Gateway. 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 Gateway is
192.168.1.1 (the address of the Gateway). If these are not correct, use
the Release and Renew functions to obtain a new IP address from the
Gateway. Under Windows 2000, use the ipconfig command-line
utility to perform the same functions.
program on the accompanying CD-ROM as described in Appendix A
.
Connecting to the
Internet
If you can browse to the Gateway configuration screens but cannot
access sites on the Internet, check the following:
■ Confirm that the physical connection between the Gateway and the
cable/DSL modem is OK, and that the link status LEDs on both
Gateway 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
Gateway configuration screens as required by your Internet Service
Provider. Use the “Internet Settings” screen to verify this.
■ 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. If so, use the Clone MAC Address feature in the
Gateway to ensure that the correct MAC address is presented, as
described on page 60
■ For cable users, check whether your ISP requires a fixed Host Name. If
.
so, enter the required Host Name in the Internet Settings screen.
■ 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 85
Forgotten
Password and Reset
to Factory Defaults
If you can browse to the Gateway configuration screen but cannot log on
because you do not know or have forgotten the password, follow the
steps below to reset the Gateway 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
Gateway 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 Gateway.
2 Disconnect all your computers and the cable/DSL modem from the
Gateway.
3 Using a straight through Ethernet cable, connect the Ethernet Cable/DSL
port on the rear of the Gateway to any one of the LAN ports.
4 Re-apply power to the Gateway. The Alert LED will flash as the Gateway
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 Gateway.
5 Remove the cable connecting the Cable/DSL port to the LAN port, and
reconnect one of your computers to one of the Gateway LAN ports.
6 Re-apply power to the Gateway, and when the start-up sequence has
completed, browse to:
Wireless
Networking
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.
■ 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 Gateway contains an
Access Point that is designed to operate in Infrastructure mode. Ad
Hoc mode is not supported by the Gateway.
86 CHAPTER 6: TROUBLESHOOTING
■ If you have a wired and a wireless NIC in the same computer, ensure
■ Check the status of the Gateway Wireless LED, it should be lit if
■ Ensure that the TCP/IP settings for all devices are correct.
■ Ensure that the Wireless Clients are using the same SSID or Service
■ Ensure that the encryption method and level that you use on your
■ Ensure that you have the Wireless computer enabled in the list of
■ If you are having difficulty connecting or are operating at a low speed
that the wired NIC is disabled.
wireless is enabled and will flash when there is wireless activity. If not
lit go to “
Wireless Settings” on page 47 and enable wireless
networking.
Area Name as the Gateway. The SSID is case-sensitive
clients are the same as those configured on the Gateway. The
Gateway can simultaneously support WPA and WEP encryption, but
can only support one configuration of each.
allowed MAC addresses if you are using Wireless Connection control
on the Gateway.
try changing the antenna positions on the rear of the Gateway. 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
Gateway 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 Gateway, or trying a
different channel on the Gateway.
■ 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
Gateway 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 Gateway to establish
whether this problem exists.
■ Most wireless computer Adapters will scan the channels for the
wireless Gateway. If a wireless computer has not located the Gateway
then try initiating a search manually if the client software supports this
feature or manually set the channel on your wireless computer to
Power LED or Power Adapter OK LED Not Lit 87
correspond to the Gateway 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 Gateway the better the
speed. If you are not achieving the speed you had anticipated then try
moving the antenna on the Gateway or moving the Wireless
computer closer to the Gateway. In an ideal network the Gateway
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
Replacement Power
Adapters
■ Check that your Gateway 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 Gateway.
You should only use the power adapter supplied with your Gateway.
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
88 CHAPTER 6: TROUBLESHOOTING
adapter part number shown on the OfficeConnect power adapter you
are using.
Alternatively, quote the part number for your region:
Tab le 3 Power Adapter Part Numbers
Part Number Region
3C16740A US and Canada
3C16741A UK
3C16742A Europe and Middle East
3C16743A Japan
3C16744A Australasia (except Japan and Korea)
3C16745A South Africa
3C16747A Korea
3C16748A Argentina
Alert LED The Alert LED will flash when the Gateway unit is first powered up while
the system software checks the hardware for proper operation. Once the
Gateway 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 Gateway, 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 Gateway software on the accompanying CD-ROM or 3Com web
http://www.3com.com) and upload it to the Gateway to see if
site (
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 Gateway 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 Gateway logs such attacks,
and this information is available through the Status and Logs screens.
Recovering from Corrupted Software 89
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
Gateway 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 Gateway 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 Gateway 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 Gateway address: 192.168.1.1
3 Restart the computer, and re-apply power to the Gateway.
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 Gateway.
5 Follow the on-screen instructions. Enter the path and filename of the
software image file.
6 When the upload has completed, the Gateway 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 Gateway 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 Gateway does not resume normal operation following the upload,
it may be faulty. Contact your supplier for advice.
90 CHAPTER 6: TROUBLESHOOTING
Frequently Asked
Questions
How do I reset the Gateway to Factory Defaults?
Forgotten Password and Reset to Factory Defaults” on
See “
page 85
.
How many computers on the LAN does the Gateway support?
A maximum of 253 computers on the LAN are supported.
How many wireless clients does the Wireless Cable/DSL Gateway
support?
A maximum of 128 wireless clients are supported.
There are only 4 LAN ports on the Gateway. 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 Gateway. 3Com wireless access points and OfficeConnect
hubs and switches provide a simple, reliable means of expanding
your network; contact your supplier for more information, or visit:
http://www.3com.com/
Does the Gateway support virtual private networks (VPNs)?
The Gateway supports VPN passthrough, which allows VPN clients
on the LAN to communicate with VPN hosts on the Internet. It is
also possible to set up VPN hosts on your LAN that clients
elsewhere on the Internet can connect to, but this is not a
recommended configuration.
Where can I download software updates for the Gateway?
Updates to the Gateway software are posted on the 3Com support
web site, accessible by visiting:
http://www.3com.com
What other online resources are there?
The 3Com Knowledgebase at:
http://knowledgebase.3com.com
Frequently Asked Questions 91
is a database of technical information covering all 3Com products.
It is updated daily with information from 3Com technical support
services, and it is available 24 hours a day, 7 days a week.
92 CHAPTER 6: TROUBLESHOOTING
A
USING DISCOVERY
Running the
Discovery
Application
Windows Installation
(95/98/2000/Me/NT)
3Com provides a user friendly Discovery application for detecting the
Gateway on the network.
1 Insert the Gateway CD-ROM in the CD-ROM drive on your computer. A
menu will appear; select Gateway Discovery.
Discovery will find the Gateway even if it is unconfigured or
misconfigured.
Figure 66 Discovery Welcome Screen
2 When the Welcome screen is displayed click on Next and wait until the
application discovers the Gateways connected to your LAN.
94 APPENDIX A: USING DISCOVERY
Figure 67 Discovered Gateway Screen
3 Figure 68 shows an example Discovered Devices screen. Highlight the
Wireless Cable/DSL Gateway by clicking on it, and press Next.
Figure 68 Discovery Finish Screen
4 Click on Finish to launch a web browser and display the login page for
the Gateway.
B
IP ADDRESSING
The Internet
Protocol Suite
Managing the
Gateway over the
Network
IP Addresses and
Subnet Masks
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.
To manage a device over the network, the Gateway must be correctly
configured with the following IP information:
■ An IP address
■ A Subnet Mask
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.
96 APPENDIX B: IP ADDRESSING
For your network to work correctly, all devices on the network must have:
■ The same sub-network address.
■ The same subnet mask.
The only value that will be different is the specific host device number.
This value must always be unique.
An example IP address is ‘192.168.100.8’. However, the size of the
network determines the structure of this IP Address. In using the
Gateway, you will probably only encounter two types of IP Address and
subnet mask structures.
Typ e O ne
In a small network, the IP address of ‘192.168.100.8’ is split into two
parts:
■ Part one (‘192.168.100’) identifies the network on which the device
■ Part two (‘.8’) identifies the device within the network.
resides.
This type of IP Address operates on a subnet mask of ‘255.255.255.0’.
See Ta bl e 4
for an example about how a network with three computers
and a Gateway might be configured.
Tab le 4 IP Addressing and Subnet Masking
Device IP Address Subnet Mask
PC 1 192.168.100.8 255.255.255.0
PC 2 192.168.100.33 255.255.255.0
PC 3 192.168.100.188 255.255.255.0
Gateway 192.168.100.72 255.255.255.0
Typ e Tw o
In larger networks, where there are more devices, the IP address of
‘192.168.100.8’ is, again, split into two parts but is structured differently:
■ Part one (‘192.168’) identifies the network on which the device
resides.
■ Part two (‘.100.8’) identifies the device within the network.
How does a Device Obtain an IP Address and Subnet Mask? 97
This type of IP Address operates on a subnet mask of ‘255.255.0.0’.
See Ta bl e 5 for an example about how a network (only four computers
represented) and a Gateway might be configured.
Tab le 5 IP Addressing and Subnet Masking
Device IP Address Subnet Mask
PC 1 192.168.100.8 255.255.0.0
PC 2 192.168.201.30 255.255.0.0
PC 3 192.168.113.155 255.255.0.0
PC 4 192.168.002.230 255.255.0.0
Gateway 192.168.002.72 255.255.0.0
How does a Device
Obtain an IP
Address and Subnet
Mask?
There are three different ways to obtain an IP address and the subnet
mask. These are:
■ Dynamic Host Configuration Protocol (DHCP) Addressing
■ Static Addressing
■ Automatic Addressing (Auto-IP Addressing)
DHCP Addressing The Gateway contains a DHCP server, which allows computers on your
network to obtain an IP address and subnet mask automatically. DHCP
assigns a temporary IP address and subnet mask which gets reallocated
once you disconnect from the network.
DHCP will work on any client Operating System such as Windows
Windows 98 or Windows NT 4.0. Also, using DHCP means that the same
IP address and subnet mask will never be duplicated for devices on the
network. DHCP is particularly useful for networks with large numbers of
users on them.
Static Addressing You must enter an IP Address and the subnet mask manually on every
device. Using a static IP and subnet mask means the address is
permanently fixed.
Auto-IP Addressing Network devices use automatic IP addressing if they are configured to
acquire an address using DHCP but are unable to contact a DHCP server.
Automatic IP addressing is a scheme where devices allocate themselves
®
95,
98 APPENDIX B: IP ADDRESSING
an IP address at random from the industry standard subnet of
169.254.x.x (with a subnet mask of 255.255.0.0). If two devices allocate
themselves the same address, the conflict is detected and one of the
devices allocates itself a new address.
Automatic IP addressing support was introduced by Microsoft in the
Windows 98 operating system and is also supported in Windows 2000.
C
TECHNICAL SPECIFICATIONS
This section lists the technical specifications for the OfficeConnect
Wireless 11g Cable/DSL Gateway.
Wireless 11g
Cable/DSL Gateway
Interfaces
Cable/DSL modem connection — 10Mbps/100Mbps dual speed Ethernet
port (10BASE-T/100BASE-TX)
LAN connection — four 10Mbps/100Mbps dual speed Ethernet ports
(10BASE-T/100BASE-TX)
WLAN Interfaces
Standard IEEE 802.11g, Direct Sequence Spread Spectrum (DSSS)
Transmission rate: 54Mbps, automatic fallback to 48, 36, 24, 18, 12, or
6Mbps
Maximum channels: 14
Range up to 304.8m (1000ft)
Frequency: (US/Canada/Europe) 2.400-2.4835 GHz
Sensitivity: 6, 12, 18, 24, 36, 48 Mbps: -85 dBm;
54 Mbps -66 dBm typical
Modulation: CCK, BPSK, QPSK, OFDM
Encryption: 40/64 bit WEP, 128 bit WEP, WPA
Maximum clients: 128
O/P Power: 18dBm
Standard IEEE 802.11b, Direct Sequence Spread Spectrum (DSSS)
Transmission rate: 11bps, automatic fallback to 5.5, 2, or 1 Mbps
Maximum channels: 14
Range up to 304.8m (1000ft)
Frequency: (US/Canada/Europe) 2.400-2.4835 GHz
Sensitivity: 1, 2, 5.5 Mbps: -85 dBm; 11 Mbps -82 dBm typical
Modulation: CCK, BPSK, QPSK, OFDM
100 APPENDIX C: TECHNICAL SPECIFICATIONS
Encryption: 40/64 bit WEP, 128 bit WEP, WPA
Maximum clients: 128
O/P Power 18dBm
Operating Temperature
0 °C to 40 °C (32 °F to 105 °F)
Power
7VA, 23.9 BThU/hr
Humidity
0 % to 90 % (non-condensing) humidity
Dimensions
■ Width = 220 mm (8.7 in.)
■ Depth = 135 mm (5.3 in.)
■ Height = 24 mm (1 in.)
Weight
Approximately 500 g (1.1 lbs)
Standards Functional: ISO 8802/3
IEEE 802.3
IEEE 802.11b, 802.11g, Wi-Fi
Safety: UL60950
CSA 22.2 #60950
IEC 60950
EN 60950
EMC: EN 55022 Class B
EN 55024
CISPR 22
FCC Part 15 Class B*
ICES-003 Class B
CNS 13438 Class A
ETSI EN 301 489–17
Radio CFR 47 FCC Part 15.207, 15.209, 15.247 and 15.249.
ETS 300 328 (2.4 GHz ISM band wide band transmission
systems.
RSS-210
Environmental: EN 60068 (IEC 68)
101
*See “FCC Statement”
on page 121 for conditions of operation.
System Requirements Operating Systems
The Gateway will support the following Operating Systems:
■ Windows 95/98
■ Windows NT 4.0
■ Windows ME
■ Windows 2000
■ Windows XP
■ Mac OS 8.5 or higher
■ Unix
Ethernet Performance The Gateway complies to the IEEE 802.3i, u and x specifications.
Wireless Performance The Gateway has been designed to conform to the Wi-Fi interoperability
test standard.
Cable Specifications The Gateway supports the following cable types and maximum lengths:
■ Category 3 (Ethernet) or Category 5 (Fast Ethernet or Dual Speed
Ethernet) Twisted Pair — shielded and unshielded cable types.
■ Maximum cable length of 100m (327.86 ft).
102 APPENDIX C: TECHNICAL SPECIFICATIONS
D
Important Safety
Information
SAFETY INFORMATION
WARNING: Warnings contain directions that you must follow for your
personal safety. Follow all directions carefully.
You must read the following safety information carefully before you
install or remove the unit:
WARNING: The Gateway generates and uses radio frequency (rf) energy.
In some environments, the use of rf energy is not permitted. The user
should seek local advice on whether or not rf energy is permitted within
the area of intended use.
WARNING: Exceptional care must be taken during installation and
removal of the unit.
WARNING: Only stack the Gateway with other OfficeConnect units.
WARNING: To ensure compliance with international safety standards,
only use the power adapter that is supplied with the unit.
WARNING: The socket outlet must be near to the unit and easily
accessible. You can only remove power from the unit by disconnecting
the power cord from the outlet.
WARNING: This unit operates under SELV (Safety Extra Low Voltage)
conditions according to IEC 60950. The conditions are only maintained
if the equipment to which it is connected also operates under SELV
conditions.
WARNING: There are no user-replaceable fuses or user-serviceable
parts inside the Gateway. If you have a physical problem with the unit
that cannot be solved with problem solving actions in this guide,
contact your supplier.
104 APPENDIX D: SAFETY INFORMATION
WARNING: Disconnect the power adapter before moving the unit.
WARNING: RJ-45 ports. These are shielded RJ-45 data sockets. They
cannot be used as telephone sockets. Only connect RJ-45 data
connectors to these sockets.
Wichtige
Sicherheitshinweise
VORSICHT: Warnhinweise enthalten Anweisungen, die Sie zu Ihrer
eigenen Sicherheit befolgen müssen. Alle Anweisungen sind sorgfältig
zu befolgen.
Sie müssen die folgenden Sicherheitsinformationen sorgfältig
durchlesen, bevor Sie das Geräts installieren oder ausbauen:
VORSICHT: Der Gateway erzeugt und verwendet Funkfrequenz (RF). In
manchen Umgebungen ist die Verwendung von Funkfrequenz nicht
gestattet. Erkundigen Sie sich bei den zuständigen Stellen, ob die
Verwendung von Funkfrequenz in dem Bereich, in dem der Bluetooth
Access Point eingesetzt werden soll, erlaubt ist.
VORSICHT: Bei der Installation und beim Ausbau des Geräts ist mit
höchster Vorsicht vorzugehen.
VORTSICHT: Stapeln Sie das Geräts nur mit anderen OfficeConnect
Gerätes zusammen.
VORSICHT: Aufgrund von internationalen Sicherheitsnormen darf das
Gerät nur mit dem mitgelieferten Netzadapter verwendet werden.
VORSICHT: Die Netzsteckdose muß in der Nähe des Geräts und leicht
zugänglich sein. Die Stromversorgung des Geräts kann nur durch
Herausziehen des Gerätenetzkabels aus der Netzsteckdose
unterbrochen werden.
VORSICHT: Der Betrieb dieses Geräts erfolgt unter den
SELV-Bedingungen (Sicherheitskleinstspannung) gemäß IEC 60950.
Diese Bedingungen sind nur gegeben, wenn auch die an das Gerät
angeschlossenen Geräte unter SELV-Bedingungen betrieben werden.
Consignes
importantes de
sécurité
105
VORSICHT: Es sind keine von dem Benutzer zu ersetzende oder zu
wartende Teile in dem Gerät vorhanden. Wenn Sie ein Problem mit
dem Gateway haben, das nicht mittels der Fehleranalyse in dieser
Anleitung behoben werden kann, setzen Sie sich mit Ihrem Lieferanten
in Verbindung.
VORSICHT: Vor dem Ausbau des Geräts das Netzadapterkabel
herausziehen.
VORSICHT: RJ-45-Anschlüsse. Dies sind abgeschirmte
RJ-45-Datenbuchsen. Sie können nicht als Telefonanschlußbuchsen
verwendet werden. An diesen Buchsen dürfen nur RJ-45-Datenstecker
angeschlossen werden.
AVERTISSEMENT: Les avertissements présentent des consignes que
vous devez respecter pour garantir votre sécurité personnelle. Vous
devez respecter attentivement toutes les consignes.
Nous vous demandons de lire attentivement les consignes suivantes de
sécurité avant d’installer ou de retirer l’appareil:
AVERTISSEMENT: La Gateway fournit et utilise de l'énergie
radioélectrique (radio fréquence -rf). L'utilisation de l'énergie
radioélectrique est interdite dans certains environnements. L'utilisateur
devra se renseigner sur l'autorisation de cette énergie dans la zone
prévue.
AVERTISSEMENT: Faites très attention lors de l'installation et de la
dépose du groupe.
AVERTISSEMENT: Seulement entasser le moyer avec les autres moyeux
OfficeConnects.
AVERTISSEMENT: Pour garantir le respect des normes internationales
de sécurité, utilisez uniquement l'adaptateur électrique remis avec cet
appareil.
AVERTISSEMENT: La prise secteur doit se trouver à proximité de
l’appareil et son accès doit être facile. Vous ne pouvez mettre l’appareil
hors circuit qu'en débranchant son cordon électrique au niveau de
cette prise.
106 APPENDIX D: SAFETY INFORMATION
AVERTISSEMENT: L’appareil fonctionne à une tension extrêmement
basse de sécurité qui est conforme à la norme CEI 60950. Ces
conditions ne sont maintenues que si l'équipement auquel il est
raccordé fonctionne dans les mêmes conditions.
AVERTISSEMENT: Il n’y a pas de parties remplaceables par les
utilisateurs ou entretenues par les utilisateurs à l’intérieur du moyeu. Si
vous avez un problème physique avec le moyeu qui ne peut pas être
résolu avec les actions de la résolution des problèmes dans ce guide,
contacter votre fournisseur.
AVERTISSEMENT: Débranchez l'adaptateur électrique avant de retirer
cet appareil.
AVERTISSEMENT: Ports RJ-45. Il s'agit de prises femelles blindées de
données RJ-45. Vous ne pouvez pas les utiliser comme prise de
téléphone. Branchez uniquement des connecteurs de données RJ-45 sur
ces prises femelles.
END USER SOFTWARE LICENSE
E
AGREEMENT
3Com Corporation
END USER SOFTWARE LICENSE AGREEMENT
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PRODUCT, THE USE OF WHICH IS LICENSED BY 3COM CORPORATION ("3COM") TO ITS CUSTOMERS FOR THEIR USE ONLY AS SET FORTH
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108 APPENDIX E: END USER SOFTWARE LICENSE AGREEMENT
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F
Information
Regarding Popular
ISPs
ISP INFORMATION
WAN Types Characteristics Popular ISPs
Dynamic IP
(Clone MAC)
Dynamic IP
(Hostname)
PPPoE
(DSL)
PPTP Cable or DSL, always on. Some
Cable modem ISP, non-hostname
based. Need to clone the MAC
address in the Advanced tab of
the Internet Settings page.
Cable ISP, Requires Hostname to
authenticate ie. cx213818-B.
Need to enter the hostname in the
Internet Settings page.
Usually special software installed
on PC, MacPOET/WinPOET,
EnterNet 300. The Gateway has
this software built in and you can
remove it from your PC. You will
need to enter the user name and
password that your ISP provided
to you in the PPPoE page of the
Gateway. Leave the service name
blank unless your ISP requires it.
European ISPs require a PPTP
tunnel to authenticate their
network.
MediaOne, RoadRunner,
Optimum Online, Time Warner,
Charter, Adelphia, Metrocast.
@Home Network, Cogoco,
ComCast, Cox, Excite, Rogers,
Shaw, Insight, Videotron
Bell*, Century Tel, Citizens,
Primus, Prodigy, Snet, Sprint FC,
Verizon, First World, Brightnet,
Earthlink, Ameritech, Covad,
Mindspring, Sympatico DSL,
USwest, Owest, SNet
KPN (Netherlands), Austria
Telecom
110 APPENDIX F: ISP INFORMATION
Static
(DSL)
Static
(Cable)
DSL Modem, always on. Need to
enter ALL IP information from ISP
in the Static IP address section of
the Internet Settings page.
Cable Modem, Always on, ISP
assigns specific IP information
which needs to be entered on the
“Fixed IP” page of the Gateway.
CableSpeed, Cnet, Direct Link,
Drizzle, DSL Extreme, Earthlink
Wireless, Fast Point, Flashcom,
GTE-WhirlWind, Heavenet, HSA
Corp, I-55, InterAccess, LinkLine,
Mission, Nauticom, NAS, Omitel,
Onterra, Phatpipe, Rhythms,
Speakeasy, Sterling, XO, Zyan
Cox Cable, Sprint, US Cable,
Cable-Cable
*Bell includes Bell Advantage, Bell Canada, Bell South, PacBell and
Southwestern Bell.
GLOSSARY
802.11b The IEEE specification for wireless Ethernet which allows speeds of up to
11 Mbps. The standard provides for 1, 2, 5.5 and 11 Mbps data rates.
The rates will switch automatically depending on range and environment.
802.11g The IEEE specification for wireless Ethernet which allows speeds of up to
54 Mbps. The standard provides for 6, 12, 24, 36, 48 and 54 Mbps data
rates. The rates will switch automatically depending on range and
environment.
10BASE-T The IEEE specification for 10 Mbps Ethernet over Category 3, 4 or 5
twisted pair cable.
100BASE-TX The IEEE specification for 100 Mbps Fast Ethernet over Category 5
twisted-pair cable.
Access Point An Access Point is a device through which wireless clients connect to
other wireless clients and which acts as a bridge between wireless clients
and a wired network, such as Ethernet. Wireless clients can be moved
anywhere within the coverage area of the access point and still connect
with each other. If connected to an Ethernet network, the access point
monitors Ethernet traffic and forwards appropriate Ethernet messages to
the wireless network, while also monitoring wireless client radio traffic
and forwarding wireless client messages to the Ethernet LAN.
Ad Hoc mode Ad Hoc mode is a configuration supported by most wireless clients. It is
used to connect a peer to peer network together without the use of an
access point. It offers lower performance than infrastructure mode, which
is the mode the gateway uses. (see also Infrastructure mode.)
Auto-negotiation Some devices in the OfficeConnect range support auto-negotiation.
Auto-negotiation is where two devices sharing a link, automatically
112 GLOSSARY
configure to use the best common speed. The order of preference (best
first) is: 100BASE-TX full duplex, 100BASE-TX half duplex, 10BASE-T full
duplex, and 10BASE-T half duplex. Auto-negotiation is defined in the IEEE
802.3 standard for Ethernet and is an operation that takes place in a few
milliseconds.
Bandwidth The information capacity, measured in bits per second, that a channel can
transmit. The bandwidth of Ethernet is 10 Mbps, the bandwidth of Fast
Ethernet is 100 Mbps. The bandwidth for 802.11b wireless is 11Mbps.
Category 3 Cables One of five grades of Twisted Pair (TP) cabling defined by the EIA/TIA-586
standard. Category 3 is voice grade cable and can only be used in
Ethernet networks (10BASE-T) to transmit data at speeds of up to 10
Mbps.
Category 5 Cables One of five grades of Twisted Pair (TP) cabling defined by the EIA/TIA-586
standard. Category 5 can be used in Ethernet (10BASE-T) and Fast
Ethernet networks (100BASE-TX) and can transmit data up to speeds of
100 Mbps. Category 5 cabling is better to use for network cabling than
Category 3, because it supports both Ethernet (10 Mbps) and Fast
Ethernet (100 Mbps) speeds.
Channel Similar to any radio device, the OfficeConnect Wireless Cable/DSL
gateway allows you to choose different radio channels in the wireless
spectrum. A channel is a particular frequency within the 2.4GHz
spectrum within which the Gateway operates.
Client The term used to described the desktop PC that is connected to your
network.
DHCP Dynamic Host Configuration Protocol. This protocol automatically assigns
an IP address for every computer on your network. Windows 95,
Windows 98 and Windows NT 4.0 contain software that assigns IP
addresses to workstations on a network. These assignments are made by
the DHCP server software that runs on Windows NT Server, and Windows
95 and Windows 98 will call the server to obtain the address. Windows
98 will allocate itself an address if no DHCP server can be found.
DNS Server Address DNS stands for Domain Name System, which allows Internet host
computers to have a domain name (such as 3com.com) and one or more
GLOSSARY 113
IP addresses (such as 192.34.45.8). A DNS server keeps a database of
host computers and their respective domain names and IP addresses, so
that when a domain name is requested (as in typing “3com.com” into
your Internet browser), the user is sent to the proper IP address. The DNS
server address used by the computers on your home network is the
location of the DNS server your ISP has assigned.
DSL modem DSL stands for digital subscriber line. A DSL modem uses your existing
phone lines to send and receive data at high speeds.
Encryption A method for providing a level of security to wireless data transmissions.
The OfficeConnect Cable/DSL Gateway and Wireless Cable/DSL Gateway
uses two levels of encryption; 40/64 bit and 128 bit. 128 bit is a more
powerful level of encryption than 40/64 bit.
ESSID Extended Service Set Identifier. The ESSID is a unique identifier for your
wireless network. You must have the same ESSID entered into the
gateway and each of it's wireless clients.
Ethernet A LAN specification developed jointly by Xerox, Intel and Digital
Equipment Corporation. Ethernet networks use CSMA/CD to transmit
packets at a rate of 10 Mbps over a variety of cables.
Ethernet Address See MAC address.
Fast Ethernet An Ethernet system that is designed to operate at 100 Mbps.
Firewall Electronic protection that prevents anyone outside of your network from
seeing your files or damaging your computers.
Full Duplex A system that allows packets to be transmitted and received at the same
time and, in effect, doubles the potential throughput of a link.
Gateway A device that acts as a central hub by connecting to each computer's
network interface card and managing the data traffic between the local
network and the Internet.
Half Duplex A system that allows packets to transmitted and received, but not at the
same time. Contrast with full duplex.
114 GLOSSARY
Hub A device that regenerates LAN traffic so that the transmission distance of
that signal can be extended. Hubs are similar to repeaters, in that they
connect LANs of the same type; however they connect more LANs than a
repeater and are generally more sophisticated.
IEEE Institute of Electrical and Electronics Engineers. This American
organization was founded in 1963 and sets standards for computers and
communications.
IETF Internet Engineering Task Force. An organization responsible for
providing engineering solutions for TCP/IP networks. In the network
management area, this group is responsible for the development of the
SNMP protocol.
Infrastructure mode Infrastructure mode is the wireless configuration supported by the
Gateway. You will need to ensure all of your clients are set up to use
infrastructure mode in order for them to communicate with the Access
Point built into your Gateway. (see also Ad Hoc mode)
IP Internet Protocol. IP is a layer 3 network protocol that is the standard for
sending data through a network. IP is part of the TCP/IP set of protocols
that describe the routing of packets to addressed devices. An IP address
consists of 32 bits divided into two or three fields: a network number and
a host number or a network number, a subnet number, and a host
number.
IP Address Internet Protocol Address. A unique identifier for a device attached to a
network using TCP/IP. The address is written as four octets separated
with periods (full-stops), and is made up of a network section, an
optional subnet section and a host section.
ISP Internet Service Provider. An ISP is a business that provides connectivity to
the Internet for individuals and other businesses or organizations.
LAN Local Area Network. A network of end stations (such as PCs, printers,
servers) and network devices (hubs and switches) that cover a relatively
small geographic area (usually not larger than a floor or building). LANs
are characterized by high transmission speeds over short distances (up to
1000 metres).
GLOSSARY 115
MAC Media Access Control. A protocol specified by the IEEE for determining
which devices have access to a network at any one time.
MAC Address Media Access Control Address. Also called the hardware or physical
address. A layer 2 address associated with a particular network device.
Most devices that connect to a LAN have a MAC address assigned to
them as they are used to identify other devices in a network. MAC
addresses are 6 bytes long.
NAT Network Address Translation. NAT enables all the computers on your
network to share one IP address. The NAT capability of the Gateway
allows you to access the Internet from any computer on your home
network without having to purchase more IP addresses from your ISP.
Network A Network is a collection of computers and other computer equipment
that are connected for the purpose of exchanging information or sharing
resources. Networks vary in size, some are within a single room, others
span continents.
Network Interface
Card (NIC)
Protocol A set of rules for communication between devices on a network. The
PPPoE Point-to-Point Protocol over Ethernet. Point-to-Point Protocol is a method
PPTP Point-to-Point Tunneling Protocol is a method of secure data transmission
RJ-45 A standard connector used to connect Ethernet networks. The “RJ”
Server A computer in a network that is shared by multiple end stations. Servers
A circuit board installed into a piece of computing equipment, for
example, a computer, that enables you to connect it to the network. A
NIC is also known as an adapter or adapter card.
rules dictate format, timing, sequencing and error control.
of data transmission originally created for dial-up connections; PPPoE is
for Ethernet connections.
between two remote sites over the internet.
stands for “registered jack”.
provide end stations with access to shared network services such as
computer files and printer queues.
116 GLOSSARY
SSID Service Set Identifier. Some vendors of wireless products use SSID
interchangeably with ESSID.
Subnet Address An extension of the IP addressing scheme that allows a site to use a single
IP network address for multiple physical networks.
Subnet mask A subnet mask, which may be a part of the TCP/IP information provided
by your ISP, is a set of four numbers configured like an IP address. It is
used to create IP address numbers used only within a particular network
(as opposed to valid IP address numbers recognized by the Internet,
which must assigned by InterNIC).
Subnets A network that is a component of a larger network.
Switch A device that interconnects several LANs to form a single logical LAN that
comprises of several LAN segments. Switches are similar to bridges, in
that they connect LANs of a different type; however they connect more
LANs than a bridge and are generally more sophisticated.
TCP/IP Transmission Control Protocol/Internet Protocol. This is the name for two
Tra ffi c The movement of data packets on a network.
universal plug and
play
URL Filter A URL Filter is a feature of a firewall that allows it to stop its clients form
of the most well-known protocols developed for the interconnection of
networks. Originally a UNIX standard, TCP/IP is now supported on almost
all platforms, and is the protocol of the Internet.
TCP relates to the content of the data travelling through a network —
ensuring that the information sent arrives in one piece when it reaches its
destination. IP relates to the address of the end station to which data is
being sent, as well as the address of the destination network.
Universal plug and play is a system which allows compatible applications
to read some of their settings from the Gateway. This allows them to
automatically configure some, or all, of their settings and need less user
configuration.
browsing inappropriate Web sites.
GLOSSARY 117
WAN Wide Area Network. A network that connects computers located in
geographically separate areas (for example, different buildings, cities, or
countries). The Internet is an example of a wide area network.
WECA Wireless Ethernet Compatibility Alliance. An industry group formed to
certify cross vendor interoperability and compatibility of 802.11b and
802.11g wireless networking products and to promote the standard for
enterprise, small business and home environments. (see also 802.11b,
802.11g, Wi-Fi)
WEP Wired Equivalent Privacy. A shared key encryption mechanism for wireless
networking. Encryption strength is 40/64 bit or 128 bit.
Wi-Fi Wireless Fidelity. This is the certification granted by WECA to products
that meet their interoperability criteria. (see also 802.11b, WECA)
Wireless Client The term used to describe a desktop or mobile PC that is wirelessly
connected to your wireless network
Wireless LAN Service
Area
Wizard A Windows application that automates a procedure such as installation
WLAN Wireless Local Area Network. A WLAN is a group of computers and
WPA Wi-Fi Protected Access. A dynamically changing encryption mechanism
Another term for ESSID (Extended Service Set Identifier)
or configuration.
devices connected together by wireless in a relatively small area (such as a
house or office).
for wireless networking. Encryption strength is 256 bit.
118 GLOSSARY
INDEX
A
Access Rights 69
Addresses
IP 95
Administration Password 32, 43
Automatic Addressing 97
C
Cable Specifications 101
Channels 121
Clone MAC address 60
Configuration
backup 77
restore 77
Conventions
notice icons, About This Guide 8
text, About This Guide 8
Country Selection 30
D
DHCP 35, 38, 45, 97
DHCP Server 27
Discovery Application 93
DMZ 63
DNS 26, 36, 37, 60, 61, 63
primary 36, 37, 59
secondary 36, 37, 59
Dynamic 57
Dynamic IP Address 35, 57, 63
F
Firewall 63
Forgotten Password 85
G
Gateway 13
I
Internet
addresses 95
Internet Addressing Mode 33
Internet Settings 57
dynamic IP address 57
PPPoE 57
PPTP 57
static IP address 57
IP Address 21, 36, 38, 45, 95
IP Allocation 58
ISP Connection 58
ISP Gateway Address 36
L
LAN 38, 44
LED 14
Login 94
Logs 80
M
MAC Address 35, 46
deleting 54
modifying 54
N
Network
addresses 95
Networking
wireless 85
NIC
wireless 14
P
Password 29, 43
PC Privileges 67
PING 73
PPPoE 21, 28, 34, 57, 61
PPTP 21, 57, 62
Profile 55
120 INDEX
R
Remote Administration 74
Reset to Factory Defaults 77, 85
Restart 75
S
Safety Information 19
Security 73
Setup Wizard 29, 44
Special Applications 65
Specifications
technical 99
Static Addressing 97
Static IP Address 57, 59
Status 79
Subnet Mask 36, 38, 95
Summary 40
Support Information 80
Support Links 81
T
TCP/IP 25, 27, 38, 95
Technical
specifications 99
standards 99
Time Zone 32, 76
NIC 14
service area name 48
settings 39, 47
U
Unit Configuration 44
Upgrade 78
URL Filter 69
V
Virtual Servers 63, 64
W
WAN 33
Web Proxy 28
Wireless
authorized PCs 53
channel selection 47
client list 55
configuration 47
connection control 53
encryption 49
LED 15
networking 85
REGULATORY NOTICES FOR THE
WIRELESS 11G CABLE/DSL
GATEWAY
Channels Use of the Wireless Cable/DSL Gateway is only authorized for the
channels approved by each country. For proper installation, login to the
management interface and select your country from the drop down list.
Ta bl e 5
agencies:
Tab le 5 Channels
Channels Country
1 - 13 Australia, Austria, Bahrain, Belarus, Belgium, Chile, China, Costa
1 - 11 Argentina, Brazil, Canada, Columbia, Mexico, Taiwan, United States
10 - 13 France*, Jordan
5 - 7 Israel
1-14 Japan
below details the channels permitted by the local regulatory
Rica, Croatia, Cyprus, Czech Republic, Denmark, Finland, France*,
Germany, Greece, Hong Kong, Hungary, Iceland, India, Indonesia,
Ireland, Italy, Liechtenstein, Lithuania, Luxembourg, Malaysia,
Netherlands, New Zealand, Norway, Paraguay, Peru, Philippines,
Poland, Portugal, Russia, Saudi Arabia, Singapore, Slovenia, South
Africa, South Korea, Spain, Sweden, Switzerland, Thailand, Turkey,
United Kingdom, Uruguay, Venezuela.
* The channels available for use in France depend on the region in which
you are located.
FCC Statement This equipment has been tested and found to comply with the limits for a
Class B digital device, pursuant to Part 15 of the FCC Rules, and the
Canadian Department of Communications Equipment Standards entitled,
“Digital Apparatus,” ICES-003. These limits are designed to provide
reasonable protection against harmful interference in a residential
installation. This equipment generates, uses and can radiate radio
122
frequency energy and, if not installed and used in accordance with the
instructions, may cause harmful interference to radio communications.
However, there is no guarantee that interference will not occur in a
particular installation.
Information to the
User
If this equipment does cause interference to radio or television reception,
which can be determined by turning the equipment off and on, the user
is encouraged to try to correct the interference by one or more of the
following measures:
■ Reorient the receiving antenna.
■ Relocate the equipment with respect to the receiver.
■ Move the equipment away from the receiver.
■ Plug the equipment into a different outlet so that equipment and
receiver are on different branch circuits.
■ Consult the dealer or an experienced radio/television technician for
help.
The user may find the following booklet prepared by the Federal
Communications Commission helpful:
How to Identify and Resolve Radio-TV Interference Problems
This booklet is available from the U.S. Government Printing Office,
Washington, DC 20402, Stock No. 004-000-00345-4. In order to meet
FCC emissions limits, this equipment must be used only with cables which
comply with IEEE 802.3.
FCC Declaration of
Conformity
We declare under our sole responsibility that the
Model: Description:
3CRWE554G72 Wireless 11g Cable/DSL Gateway
to which this declaration relates, is in conformity with the following
standards or other normative documents:
■ ANSI C63.4-1992 Methods of Measurement
123
■ Federal Communications Commission 47 CFR Part 15, subpart B
15.107 (a)Class B Conducted Limits
15.109 (a)Class B Radiated Emissions Limits
■ 15.107 (e)Class B Conducted Limits
15.109 (g)Class B Radiated Emissions Limits
Exposure to Radio Frequency Radiation: The radiated output power of the
3Com OfficeConnect Wireless Cable/DSL Gateway is far below the FCC
radio frequency exposure limits. Nevertheless, the 3Com OfficeConnect
Wireless Cable/DSL Gateway shall be used in such manner that the
potential for human contact during normal operation is minimized. The
distance between the antennas and the user should not be less than
20 cm.
CE Statement
(Europe)
This product complies with the European Low Voltage Directive
73/23/EEC, EMC Directive 89/336/EEC as amended by European Directive
93/68/EEC and the Radio and Telecommunications Terminal Equipment
Directive 99/5/EC.
CSA Statement This Class B digital apparatus meets all requirements of the Canadian
Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du
Règlement sur le matériel brouilleur du Canada.
BSMI Statement
FCC
CAUTION: To assure continued compliance, any changes or
modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate this equipment.
124
RF Exposure
Compliance
Statement (U.S.)
Potential RF
Interference
(Canada)
CAUTION: The 3Com OfficeConnect Wireless Cable/DSL Gateway has
been certified as a mobile computing device as per FCC Section 2.1091.
In order to comply with the FCC RF exposure requirements, the 3Com
OfficeConnect Wireless Cable/DSL Gateway must only be installed with
approved antennas and a minimum separation distance of 20 cm (8 in)
must be maintained from the antenna to any nearby persons.
CAUTION: To prevent radio interference to the licensed service, this
device is intended to be operated indoors and away from windows to
provide maximum shielding. Equipment (or it's transmit antenna) that is
installed outdoors is subject to licensing.
3Com Corporation, Corporate Headquarters,
5500 Great America Parkway, Santa Clara,
CA 95052-8145, USA.
To learn more about 3Com products and services,
visit our World Wide Web site at www.3com.com
Copyright © 2003 3Com Corporation. All rights reserved.
3Com and OfficeConnect are registered trademarks of
3Com Corporation. All other company and product names
may be trademarks of their respective companies.
All specifications are subject to change without notice.
DUA0055-4AAA01
Rev. 01
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