WARNING:This product contains chemicals, including lead, known
to the State of California to cause cancer, and birth defects or other
reproductive harm. Wash hands after handling.
How to Use this Guide
Your Guide to the Wireless-G Cable Gateway has been designed to make understanding networking with the
Gateway easier than ever. Look for the following items when reading this User Guide:
This checkmark means there is a Note of interest and is something you should pay
special attention to while using the Gateway.
This exclamation point means there is a Caution or Warning and is
something that could damage your property or the Gateway.
This question mark provides you with a reminder about
something you might need to do while using the Gateway.
In addition to these symbols, there are definitions for technical terms that are presented like this:
word: definition.
Also, each figure (diagram, screenshot, or other image) is provided with a figure number and description, like
this:
Figure 0-1: Sample Figure Description
Figure numbers and descriptions can also be found in the “List of Figures” section in the “Table of Contents”.
WCG200_V2-UG-50509B JL
Wireless-G Cable Gateway
Table of Contents
Chapter 1: Introduction1
Welcome1
What’s in this Guide?2
Chapter 2: Planning Your Network4
The Gateway’s Functions4
IP Addresses4
Chapter 3: Getting to Know the Wireless-G Cable Gateway6
The Back Panel6
The Front Panel7
Chapter 4: Connecting the Wireless-G Cable Gateway8
Overview8
Wired Ethernet Connection to a Computer8
Wireless Connection to a Computer10
Wired USB Connection to a Computer11
Chapter 5: Configuring the Wireless-G Cable Gateway19
Overview19
How to Access the Web-based Utility21
The Setup Tab21
The Wireless Tab23
The Security Tab32
The Access Restrictions Tab34
The Applications and Gaming Tab36
The Administration Tab38
The Status Tab40
Appendix A: Troubleshooting43
Common Problems and Solutions43
Frequently Asked Questions46
The Linksys Wireless-G Cable Gateway is the all-in-one solution for Internet connectivity in your home . The Cable
Modem function gives you a blazing fast connection to the Internet, far faster than a dial-up, and without tying up
your phone line.
How does the Wireless-G Cable Gateway do all of this? A gateway is a device that allows access to a cable
Internet connection over a network. With the Gateway, this access can be shared to wireless clients at either up
to 11Mbps for Wireless-B or up to 54Mbps for Wireless-G. In addition, the WP A standard provides greater security
opportunities while the whole network is protected through a Stateful Packet Inspection (SPI) firewall and NAT
technology.
The Gateway’s firew all protects your network of PCs so users on the public, Internet side cannot “see” your PCs.
This is how your local network remains private. The Gatew ay protects your network by inspecting the first pack et
coming in through the Cable port before delivery to the final destination in the local network. The Gateway
inspects Internet port services like the web server, ftp server, or other Internet applications, and, if allowed, will
forward the packet to the appropriate PC on the LAN side. All of these security features, as well as full
configurability, are accessed through the easy-to-use browser-based utility.
You can also connect your computer to the Wireless-G Cable Gateway via USB, or use the built-in 4-port 10/100
Ethernet Switch to start your home network. You can connect four PCs directly, or daisy-chain out to more hubs
and switches to create as big a network as you need.
spi (stateful packet inspection) firewall: a technology
that inspects incoming packets of information before
allowing them to enter the network.
firewall: Security measures that protect the
resources of a local network from intruders.
nat (network address translation): NAT technology
translates IP addresses of a local area network to a
different IP address for the Internet.
lan (local area network): The computers and
networking products that make up the network in
your home or office.
But what does all of this mean?
Networks are useful tools for sharing computer resources. You can access one printer from different computers
and access data located on another computer's hard drive. Networks are even used for playing multiplayer video
games. So, networks are not only useful in homes and offices, they can also be fun.
PCs on a wired network create a LAN, or Local Area Network. They are connected with Ethernet cables, which is
why the network is called “wired”.
PCs equipped with wireless cards and adapters can communicate without cumbersome cables. By sharing the
same wireless settings, within their transmission radius, they form a wireless network. This is sometimes called
a WLAN, or Wired Local Area Network. The access point bridges wireless networks of both 802.11b and 802.11g
standards and wired networks.
Chapter 1: Introduction
Welcome
1
Wireless-G Cable Gateway
Use the instructions in this Guide to help you connect the Gateway, set it up, and configure it to bridge your
different networks. These instructions should be all you need to get the most out of the Gateway.
What’s in this Guide?
• Chapter 1: Introduction
This chapter describes the Wireless-G Cable Gateway applications and this User Guide.
• Chapter 2: Planning Your Network
This chapter describes the basics of networking.
• Chapter 3: Getting to Know the Wireless-G Cable Gateway
This chapter describes the physical features of the Gateway.
• Chapter 4: Connecting the Wireless-G Cable Gateway
This chapter instructs you on how to connect the Gateway to your network.
• Chapter 5: Configuring the Wireless-G Cable Gateway
This chapter explains how to use the Web-based Utility to configure the settings on the Gateway.
• Appendix A: Troubleshooting
This appendix describes some problems and solutions, as well as frequently asked questions, regarding
installation and use of the Wireless-G Cable Gateway.
• Appendix B: Wireless Security
This appendix explains the risks of wireless networking and some solutions to reduce the risks.
• Appendix C: Finding the MAC Address and IP Address for your Ethernet Adapter
This appendix describes how to find the MAC address for your computer’s Ethernet adapter so you can use
the MAC filtering and/or MAC address cloning feature of the Gateway.
• Appendix D: Glossary
This appendix gives a brief glossary of terms frequently used in networking.
• Appendix E: Specifications
This appendix provides the technical specifications for the Gateway.
• Appendix F: Warranty Information
This appendix supplies the warranty information for the Gateway.
Chapter 1: Introduction
What’s in this Guide?
2
Wireless-G Cable Gateway
• Appendix G: Regulatory Information
This appendix supplies the regulatory information regarding the Gateway.
• Appendix H: Contact Information
This appendix provides contact information for a variety of Linksys resources, including Technical Support.
Chapter 1: Introduction
What’s in this Guide?
3
Wireless-G Cable Gateway
Chapter 2: Planning Your Network
The Gateway’s Functions
A Gateway is a network device that connects two networks together.
In this instance, the Gateway connects your Local Area Network (LAN), or the group of computers in your home or
office, to the Internet. The Gateway processes and regulates the data that travels between these two networks.
The Gateway’s NAT feature protects your network of computers so users on the public, Internet side cannot “see”
your computers. This is how your network remains private. The Gateway protects your network by inspecting
every packet coming in through the Internet port before delivery to the appropriate computer on your network.
The Gateway inspects Internet port services like the web server, ftp server, or other Internet applications, and, if
allowed, it will forward the packet to the appropriate computer on the LAN side.
Remember that the Gateway’s ports connect to two sides. The LAN ports connect to the LAN, and the Cable port
connects to the Internet. The LAN ports transmit data at 10/100Mbps.
IP Addresses
What’s an IP Address?
IP stands for Internet Protocol. Every device on an IP-based network, including computers, print servers, and
Gateways, requires an IP address to identify its “location,” or address, on the network. This applies to both the
Internet and LAN connections. There are two ways of assigning an IP address to your network devices. You can
assign static IP addresses or use the Gateway to assign IP addresses dynamically.
Static IP Addresses
A static IP address is a fixed IP address that you assign manually to a computer or other device on the network.
Since a static IP address remains valid until you disable it, static IP addressing ensures that the device assigned
it will always have that same IP address until you change it. Static IP addresses must be unique and are
commonly used with network devices such as server computers or print servers.
Chapter 2: Planning Your Network
The Gateway’s Functions
Figure 2-1: Network
NOTE: Since the Gateway is a device that connects two
networks, it needs two IP addresses—one for the LAN,
and one for the Internet. In this User Guide, you’ll see
references to the “Internet IP address” and the “LAN IP
address.”
Since the Gateway uses NAT technology, the only IP
address that can be seen from the Internet for your
network is the Gateway’s Internet IP address. However,
even this Internet IP address can be blocked, so that the
Gateway and network seem invisible to the Internet—
see the Block WAN Requests description under Security
in “Chapter 5: Configuring the Gateway.”
static ip address: a fixed address
assigned to a computer or device that
is connected to a network.
4
Wireless-G Cable Gateway
Since you use the Gateway to share your cable Internet connection, contact your ISP to find out if they have
assigned a static IP address to your account. If so, you will need that static IP address when configuring the
Gateway. You can get that information from your ISP.
Dynamic IP Addresses
A dynamic IP address is automatically assigned to a device on the network, such as computers and print servers.
These IP addresses are called “dynamic” because they are only temporarily assigned to the computer or device.
After a certain time period, they expire and may change. If a computer logs onto the network (or the Internet) and
its dynamic IP address has expired, the DHCP server will automatically assign it a new dynamic IP address.
Computers and other network devices using dynamic IP addressing are assigned a new IP address by a DHCP
server. The computer or network device obtaining an IP address is called the DHCP client. DHCP frees you from
having to assign IP addresses manually every time a new user is added to your network.
A DHCP server can either be a designated computer on the network or another network device, such as the
Gateway. By default, the Gateway’s DHCP Server function is enabled.
If you already have a DHCP server running on your network, you must disable one of the two DHCP servers. If you
run more than one DHCP server on your network, you will experience network errors, such as conflicting IP
addresses. To disable DHCP on the Gateway, see the DHCP section in “Chapter 5: Configuring the Gateway.”
dynamic ip address: a temporary IP
address assigned by a DHCP server.
dhcp (dynamic host configuration
protocol): a protocol that lets one
device on a local network, known as a
DHCP server, assign temporary IP
addresses to the other network
devices, typically computers.
Chapter 2: Planning Your Network
IP Addresses
5
Wireless-G Cable Gateway
Chapter 3: Getting to Know the Wireless-G Cable Gateway
The Back Panel
The Gateway’s buttons and ports, where network cables are connected, are located on the back panel.
Figure 3-1: Back Panel
On/Off SwitchThis switch is used for turning the Gateway on and off.
PowerThe Power port is where you will connect the power adapter.
ResetPress this button and hold it in for five seconds to restore the Gateway to its factory default
settings.
Ports 1-4These four ports are used to connect network devices, such as PCs, print servers, and remote
hard drives to your local area network (LAN).
USBThis is where you can use a USB cable to connect the Gateway.
CableThe Cable port is where you will connect your coaxial Cable line.
Chapter 3: Getting to Know the Wireless-G Cable Gateway
The Back Panel
IMPORTANT: Resetting the Gateway to factory
defaults will erase all of your settings (Internet
connection, wireless, security, and other
settings) and replace them with the factory
defaults. Do not reset the Gateway if you want
to retain these settings.
6
Wireless-G Cable Gateway
The Front Panel
The Gateway's LEDs, which displays information about network activity, are located on the front panel.
Figure 3-2: Front Panel
PowerGreen or red. The green Power LED is solidly lit when the Gateway is powered on. If the
LED lights up red, there is an error.
Internet, DS Green. The DS (Downstream) LED lights up and flashes when the Gateway is trying to lock
on a downstream signal. The LED stays solidly lit when it has locked on the signal.
Internet, USGreen. The US (Upstream) LED lights up and flashes when the Gateway is trying to lock on
an upstream signal. The LED stays solidly lit when it has locked on the signal.
Internet, Online Green. The Online LED flashes when the Gateway is establishing a connection to your cable
ISP. It is solidly lit when the Gateway is synchronized with your cable ISP.
NOTE: If the US and DS LEDs are flashing, the
Gateway is still operating, but your Internet
service has been disabled by your Internet
Service Provider (ISP).
Ethernet-1-4Green or red. Ethernet 1-4 LED serves multiple purposes. If the LED is solid green, the
Gateway is successfully connected to a device through the corresponding port (1, 2, 3, or
4). If the LED is flashing green, the Gateway is actively sending or receiving data over that
port. If the LED lights up red, there is a collision.
USBGreen or red. The LED is solid green when a PC is connected to the Gateway via USB, and
drivers are installed. If the LED flashes red, the cable is connected, but the driver isn’t
loaded.
WirelessGreen or red. The LED flashes green during wireless activity. If the LED flashes red, there is
an error.
Chapter 3: Getting to Know the Wireless-G Cable Gateway
The Front Panel
NOTE: If the US, DS, and Online LEDs are flashing ,
the Gateway is performing a self-test.
7
Wireless-G Cable Gateway
Chapter 4: Connecting the Wireless-G Cable Gateway
Overview
To set up the Gateway, you will have to connect the Gateway to your Cable line, computers, and other network
devices, as well as configure the Gateway with setting(s) provided by your Internet Service Provider (ISP).
The installation technician from your ISP should have left the setup information for the Gateway with you after
installing your broadband connection. If not, you can call your ISP to request that data.
After you have the setup information you need for your specific type of Internet connection, you can begin
installation and setup of the Gateway.
If you want to use a computer with an Ethernet adapter to configure the Gateway, continue to “Wired Ethernet
Connection to a Computer.” If you want to use a computer with a wireless adapter to configure the Gateway,
continue to “Wireless Connection to a Computer.” If you want to use a USB connection to configure the Gateway,
continue to “Wired USB Connection to a Computer.”
Wired Ethernet Connection to a Computer
1. Before you begin, make sure that all of your network’s hardware is powered off , including the Gateway and all
computers.
2. Connect the coaxial cable from your ISP or cable company to the Cable port on the back panel of the Gateway.
(The other end of the coaxial cable should be connected according to the cable company’s instructions.)
Chapter 4: Connecting the Wireless-G Cable Gateway
Overview
Figure 4-1: Cable Connection
8
Wireless-G Cable Gateway
3. Connect one end of an Ethernet network cable to one of the Ethernet ports (labeled 1-4) on the back of the
Gateway , and the other end to an Ethernet port on a computer. Repeat this step to connect more computers, a
switch, or other network devices to the Gateway.
NOTE: If your PC’s Ethernet adapter is not set up, please refer to your Ethernet adapter’s
documentation for more information.
4. Connect the power adapter to the Gateway’s Power port, and then plug the power adapter into a power outlet.
5. Turn the On/Off switch to On.
IMPORTANT: Make sure to contact your Cable ISP with the Gateway’s MAC address after the
Gateway is powered on, so they can activate your account or you will not have Internet access.
6. Contact your Cable ISP to activate your account. Your Cable ISP will need what is called a MAC Address for
the cable modem capability of the Gateway in order to set up your account. The 12-digit modem MAC address
is printed on a bar code label on the bottom of the Gateway. Once you have given them this number, your
Cable ISP should be able to activate your account.
The Online LED flashes when the Gateway is establishing a connection to your cable ISP. When the Cable is
synchronized with your cable ISP, the LED will be solidly lit.
7. Then, turn on the PC that you want to use to configure the Gateway.
Figure 4-2: Ethernet Connection
Figure 4-3: Power Connection
The Gateway’s hardware installation is now complete. Go to “Chapter 5: Configuring the Gateway.”
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired Ethernet Connection to a Computer
NOTE: You should always plug the Gateway’s power
adapter into a power strip with surge protection.
9
Wireless-G Cable Gateway
Wireless Connection to a Computer
If you want to use a wireless connection to access the Gateway, follow these instructions:
1. Before you begin, make sure that all of your network’s hardware is powered off , including the Gateway and all
computers.
2. Connect the coaxial cable that is provided by your cable service provider to the Cable port that is on the back
of the Gateway.
3. Connect the power adapter to the Gateway’s Power port, and then plug the power adapter into a power outlet.
4. Turn the On/Off switch to On.
IMPORTANT: Make sure to contact your Cable ISP with the Gateway’s MAC address after the
Gateway is powered on, so they can activate your account or you will not have Internet access.
5. Contact your Cable ISP to activate your account. Your Cable ISP will need what is called a MAC Address for
the cable modem capability of the Gateway in order to set up your account. The 12-digit modem MAC address
is printed on a bar code label on the bottom of the Gateway. Once you have given them this number, your
Cable ISP should be able to activate your account.
Figure 4-4: Cable Connection
The Online LED flashes when the Gateway is establishing a connection to your cable ISP. When the Cable is
synchronized with your cable ISP, the LED will be solidly lit.
6. Then, turn on the PC that you want to use to configure the Gateway.
7. For initial access to the Gateway through a wireless connection, make sure the computer’s wireless adapter
has its SSID set to linksys (the Gateway’s default setting), and its encryption is disabled. After you have
accessed the Gateway, you can change the Gateway and this computer’s adapter settings to match the your
usual network settings.
NOTE: If the Gateway was provided to you by your Cable ISP, it may require different
wireless settings. If you’re experiencing problems connecting wirelessly, you may need
to connect to the Gateway with a wired connection so you can change the settings.
The Gateway’s hardware installation is now complete. Go to “Chapter 5: Configuring the Gateway.”
Chapter 4: Connecting the Wireless-G Cable Gateway
Wireless Connection to a Computer
Figure 4-5: Power Connection
NOTE: After configuration, you should always
change the SSID from its default, linksys, and
enable encryption.
10
Wireless-G Cable Gateway
Wired USB Connection to a Computer
First, make sure that all the devices that you’ll be working with are powered down, including your PCs and the
Gateway.
1. Connect the coaxial cable that is provided by your cable service provider to the Cable port that is on the back
of the Gateway.
2. Connect one end of a USB cable to your PC’s USB port and connect the other end of the USB cable to the USB
port on the back of the Gateway.
3. Connect the power adapter to the Gateway. Plug the other end of the power adapter into the electrical outlet,
preferably a surge protector.
4. Turn on the Gateway. Then, turn on your PC.
5. During the boot-up process, your computer should recognize the device and ask for driver installation.
6. Next, you will need to install the USB driver. Continue to the section for your Windows operating system.
Figure 4-6: Cable Connection
Figure 4-7: USB Connection
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired USB Connection to a Computer
Figure 4-8: Power Connection
11
Wireless-G Cable Gateway
Installing the USB Drivers for Windows 98
1. When the Add New Hardware Wizard window appears, insert the Setup CD into your CD-ROM drive and click
Next.
2. Select Search for the best driver for your device (Recommended) and click the Next button.
Figure 4-9: Add New Hardware Wizard
3. Select CD-ROM drive as the only location where Windows will search for the driver software and click the
Next button.
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired USB Connection to a Computer
Figure 4-10: Search for Driver
Figure 4-11: CD-ROM Drive
12
Wireless-G Cable Gateway
4. Windows will notify you that it has identified multiple drivers. Select The updated driver (Recommended)
as the appropriate driver. Click the Next button.
5. Windows is now ready to install the driver. Click the Next button.
6. Windows will begin installing the driver for the Gateway. At this point, the installation may require files from
your Windows 98 CD-ROM. If prompted, insert your Windows 98 CD-ROM into your CD-ROM drive and enter
d:\win98 in the box that appears (if “d” is the letter of your CD-ROM drive). If you were not supplied with a
Windows 98 CD-ROM, your Windows files may have been placed on your hard drive by your computer
manufacturer. While the location of these files may vary, many manufacturers use c:\windows\options\cabs
as the path. T ry entering this path into the box. If no files are found, check your computer’ s documentation or
contact your computer manufacturer for more information.
7. After Windows has completed installing this driver, click Finish.
Figure 4-12: Select Updated Driver
8. When asked if you want to restart your PC, remove all CD-ROMs from the PC and click Yes. If Windows does
not ask you to restart your PC, click the Start button, choose Shut Down, choose Restart, and then click Yes.
9. The Windows 98 driver installation is complete.
IMPORTANT: Make sure to contact your Cable ISP with the Gateway’s MAC address after the
Gateway is powered on, so they can activate your account or you will not have Internet access.
10. Contact your Cable ISP to activate your account. Your Cable ISP will need what is called a MAC Address for
the cable modem capability of the Gateway in order to set up your account. The 12-digit modem MAC address
is printed on a bar code label on the bottom of the Gateway. Once you have given them this number, your
Cable ISP should be able to activate your account.
The Online LED flashes when the Gateway is establishing a connection to your cable ISP. When the Cable is
synchronized with your cable ISP, the LED will be solidly lit.
The Gateway’s hardware installation is now complete. Go to “Chapter 5: Configuring the Gateway.”
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired USB Connection to a Computer
Figure 4-13: Install Driver
Figure 4-14: Driver Installation Complete
13
Wireless-G Cable Gateway
Installing the USB Driver for Windows Millennium
1. Start up your PC in Windows Millennium. Windows will detect new hardware connected to your PC. Insert the
Setup CD into your CD-ROM drive.
2. Select Automatic search for a better driver (Recommended) and click the Next button.
3. Windows will begin installing the driver for the modem. At this point, the installation may require files from
your Windows Millennium CD-ROM. If prompted, insert your Windows Millennium CD-ROM into your CD-ROM
drive and enter d:\win9x in the box that appears (if “d” is the letter of your CD-ROM drive). If you were not
supplied with a Windows CD-ROM, your Windows files may have been placed on your hard drive by your
computer manufacturer. While the location of these files may vary, many manufacturers use
c:\windows\options\install as the path. Try entering this path into the box. If no files are found, check your
computer’s documentation or contact your computer manufacturer for more information.
4. When Windows finishes installing the driver, click Finish.
Figure 4-15: New Hardware Found
5. When asked if you want to restart your PC, remove all CD-ROMs from the PC and click Yes. If Windows does
not ask you to restart your PC, click the Start button, choose Shut Down, choose Restart, and then click Yes.
6. The Windows Millennium driver installation is complete.
IMPORTANT: Make sure to contact your Cable ISP with the Gateway’s MAC address after the
Gateway is powered on, so they can activate your account or you will not have Internet access.
7. Contact your Cable ISP to activate your account. Your Cable ISP will need what is called a MAC Address for
the cable modem capability of the Gateway in order to set up your account. The 12-digit modem MAC address
is printed on a bar code label on the bottom of the Gateway. Once you have given them this number, your
Cable ISP should be able to activate your account.
The Online LED flashes when the Gateway is establishing a connection to your cable ISP. When the Cable is
synchronized with your cable ISP, the LED will be solidly lit.
The Gateway’s hardware installation is now complete. Go to “Chapter 5: Configuring the Gateway.”
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired USB Connection to a Computer
Figure 4-16: Search for Driver
Figure 4-17: Driver Installation Complete
14
Wireless-G Cable Gateway
Installing the USB Driver for Windows 2000
1. Start up your PC. Windows will notify you that it has detected new hardware. Insert the Setup CD into the CDROM drive.
2. When the Welcome to the Found New Hardware Wizard screen appears to confirm that the device has been
identified by your PC, click Next.
Figure 4-18: Found New Hardware
3. Select Search for a suitable driver for my device (recommended) and click the Next button.
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired USB Connection to a Computer
Figure 4-19: Welcome
Figure 4-20: Search for Driver
15
Wireless-G Cable Gateway
4. Windows will now search for the driver software. Select only CD -ROM drives and click the Next button.
5. Windows will notify you that it has located the appropriate driver and is ready to install it. Click the Next
button.
Figure 4-21: CD-ROM Drives
6. When Windows has completed installing the driver, click the Finish button.
7. The Windows 2000 driver installation is complete.
IMPORTANT: Make sure to contact your Cable ISP with the Gateway’s MAC address after the
Gateway is powered on, so they can activate your account or you will not have Internet access.
8. Contact your Cable ISP to activate your account. Your Cable ISP will need what is called a MAC Address for
the cable modem capability of the Gateway in order to set up your account. The 12-digit modem MAC address
is printed on a bar code label on the bottom of the Gateway. Once you have given them this number, your
Cable ISP should be able to activate your account.
The Online LED flashes when the Gateway is establishing a connection to your cable ISP. When the Cable is
synchronized with your cable ISP, the LED will be solidly lit.
The Gateway’s hardware installation is now complete. Go to “Chapter 5: Configuring the Gateway.”
Chapter 4: Connecting the Wireless-G Cable Gateway
Wired USB Connection to a Computer
Figure 4-22: Driver Located
Figure 4-23: Driver Installation Complete
16
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