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

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Figure 5-19: VPN

33

Figure 5-20: Website Blocking

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Figure 5-21: Timed Access

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Figure 5-22: MAC Address

34

Figure 5-23: Filter Internet Traffic

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Figure 5-24: Port Range Forwarding

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Figure 5-25: Port Triggering

37

Figure 5-26: DMZ

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Figure 5-27: Security

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Figure 5-28: Ping Test

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Figure 5-29: Advanced Administration

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Figure 5-30: Gateway

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Figure 5-31: Connection

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Figure 5-32: Local Network

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Figure 5-33: Modem Log

42

Figure C-1: IP Configuration Screen

53

Figure C-2: MAC Address/Adapter Address

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Figure C-3: MAC Address/Physical Address

54

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.

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.

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.

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.