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Wireless-G Cable Gateway
Figure 5-2: Dynamic IP
21
Figure 5-3: Static IP
22
Figure 5-4: Basic Wireless Settings
23
Figure 5-5: Press the SecureEasySetup Button on Only One Wireless Client
23
Figure 5-6: WPA-Personal Security Enabled
24
Figure 5-7: Wireless Security
24
Figure 5-8: WPA-Personal
25
Figure 5-9: WPA2-Personal
25
Figure 5-10: WPA-Enterprise
26
Figure 5-11: WPA2-Enterprise
26
Figure 5-12: RADIUS
27
Figure 5-13: WEP
28
Figure 5-14: Wireless Network Access
29
Figure 5-15: MAC Address Access List
29
Figure 5-16: Advanced Wireless Settings
30
Figure 5-17: WDS Tab
31
Figure 5-18: Firewall
32
Figure 5-19: VPN
33
Figure 5-20: Website Blocking
34
Figure 5-21: Timed Access
34
Figure 5-22: MAC Address
34
Figure 5-23: Filter Internet Traffic
35
Figure 5-24: Port Range Forwarding
36
Figure 5-25: Port Triggering
37
Figure 5-26: DMZ
37
Figure 5-27: Security
38
Figure 5-28: Ping Test
39
Figure 5-29: Advanced Administration
40
Figure 5-30: Gateway
40
Figure 5-31: Connection
41
Figure 5-32: Local Network
42
Figure 5-33: Modem Log
42
Figure C-1: IP Configuration Screen
53
Figure C-2: MAC Address/Adapter Address
53
Figure C-3: MAC Address/Physical Address
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Page 7 / 71
1
Chapter 1: Introduction
Welcome
Wireless-G Cable Gateway
Chapter 1: Introduction
Welcome
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 WPA standard provides greater security
opportunities while the whole network is protected through a Stateful Packet Inspection (SPI) firewall and NAT
technology.
The Gateway’s firewall 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 Gateway protects your network by inspecting the first packet
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.
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.
lan
(local area network): The computers and
networking products that make up the network in
your home or office.
nat
(network address translation): NAT technology
translates IP addresses of a local area network to a
different IP address for the Internet.
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.
Page 8 / 71
2
Chapter 1: Introduction
What’s in this Guide?
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.
Page 9 / 71
3
Chapter 1: Introduction
What’s in this Guide?
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.
Page 10 / 71
4
Chapter 2: Planning Your Network
The Gateway’s Functions
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.
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.”
Figure 2-1: Network
static ip address
: a fixed address
assigned to a computer or device that
is connected to a network.

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