Linksys AG241 Manuale utente

A Division of Cisco Systems, Inc.

Model No.

WIRED with 4-Port Switch

ADSL2 Gateway

AG241

User Guide

ADSL2 Gateway with 4-Port Switch

Specifications are subject to change without notice. Linksys is a registered trademark or trademark of Cisco

rights reserved. Other brands and product names are trademarks or registered trademarks of their respective

holders.

How to Use this Guide

Your Guide to the ADSL2 Gateway with 4-Port Switch has been designed to make understanding networking with

the Gateway easier than ever. Look for the following items when reading this User Guide:

In addition to these symbols, there are definitions for technical terms that are presented like this:

Also, each figure (diagram, screenshot, or other image) is provided with a figure number and description, like

this:

Figure numbers and descriptions can also be found in the “List of Figures” section in the “Table of Contents”.

This exclamation point means there is a Caution or

Warning and is something that could damage your

property or the Gateway.

word: definition.

This checkmark means there is a Note of interest and

is something you should pay special attention to while

using the Gateway.

This question mark provides you with a reminder about

something you might need to do while using the Gateway.

Figure 0-1: Sample Figure Description

AG241-EU_V2-UG-41122NC BW

ADSL2 Gateway with 4-Pot Switch

TableofContents

Chapter 1: Introduction 1

Welcome 1

What’s in this Guide? 2

Chapter 2: Planning Your Network 4

The Gateway’s Functions 4

IP Addresses 4

What is a VPN? 5

Why do I need a VPN? 6

Chapter 3: Getting to Know the ADSL2 Gateway with 4-Port Switch 8

The Back Panel 8

The Front Panel 9

Chapter 4: Connecting the ADSL2 Gateway with 4-Port Switch 10

Overview 10

Wired Connection to a Computer 11

Wireless Connection to a Computer 12

Chapter 5: Configuring the Gateway 13

Overview 13

How to Access the Web-based Utility 15

The Setup Tab 15

The Security Tab 22

The Access Restrictions Tab 27

The Applications and Gaming Tab 29

The Administration Tab 32

The Status Tab 37

Common Problems and Solutions 39

Frequently Asked Questions 47

Introduction 53

Environment 53

How to Establish a Secure IPSec Tunnel 54

Windows 98 or Me Instructions 64

Windows 2000 or XP Instructions 65

10/100 8-Port VPN Router

ListofFigures

Figure 2-1: Network 4

Figure 2-2: Computer-to-VPN Gateway 6

Figure 2-3: VPN Gateway-to-VPN Gateway 7

Figure 3-1: Back Panel 8

Figure 3-2: Front Panel 9

Figure 4-1: Ethernet Connection 11

Figure 4-2: ADSL Connection 11

Figure 4-3: Power Connection 11

Figure 5-1: Password Screen 15

Figure 5-2: Basic Setup Tab 15

Figure 5-3: Dynamic IP 16

Figure 5-4: Static IP 16

Figure 5-5: IPoA 17

Figure 5-6: RFC 2516 PPPoE 17

Figure 5-7: RFC 2364 PPPoA 18

Figure 5-8: Bridged Mode Only 18

Figure 5-9: Optional Settings 19

Figure 5-10: DynDNS.org 20

Figure 5-11: TZO.com 20

Figure 5-12: Advanced Routing 21

Figure 5-13: Advanced Wireless Settings 22

Figure 5-14: Firewall 23

Figure 5-15: VPN 24

Figure 5-16: VPN Settings Summary 24

Figure 5-17: Manual Key Management 25

Figure 5-18: System Log 25

Figure 5-19: Advanced VPN Tunnel Setup 26

Figure 5-20: Internet Access 27

10/100 8-Port VPN Router

Figure 5-21: Internet Policy Summary 27

Figure 5-22: List of PCs 28

Figure 5-23: Port Services 28

Figure 5-24: Single Port Forwarding 29

Figure 5-25: Port Range Forwarding 29

Figure 5-26: Port Triggering 30

Figure 5-27: DMZ 30

Figure 5-28: QOS 31

Figure 5-29: Management 32

Figure 5-30: Reporting 33

Figure 5-31: System Log 33

Figure 5-32: Ping Test 34

Figure 5-33: Backup&Restore 34

Figure 5-34: Factory Defaults 35

Figure 5-35: Firmware Upgrade 35

Figure 5-36: Reboot 36

Figure 5-37: Status 37

Figure 5-38: Local Network 37

Figure 5-39: DHCP Clients Table 37

Figure 5-40: DSL Connection 38

Figure B-1: Local Security Screen 54

Figure B-2: Rules Tab 54

Figure B-3: IP Filter List Tab 54

Figure B-4: IP Filter LIst 55

Figure B-5: Filters Properties 55

Figure B-6: New Rule Properties 55

Figure B-7: IP Filter List 56

Figure B-8: Filters Properties 56

Figure B-9: New Rule Properties 56

Figure B-10: IP Filter List Tab 57

10/100 8-Port VPN Router

Figure B-11: Filter Acton Tab 57

Figure B-12: Security Methods Tab 57

Figure B-13: Authentication Methods 58

Figure B-14: Preshared Key 58

Figure B-15: New Preshared Key 58

Figure B-16: Tunnel Setting Tab 59

Figure B-17: Connection Type Tab 59

Figure B-18: Properties Screen 59

Figure B-19: IP Filter List Tab 60

Figure B-20: Filter Action Tab 60

Figure B-21: Authentication Methods Tab 60

Figure B-22: Preshared Key 61

Figure B-23: New Preshared Key 61

Figure B-24: Tunnel Setting Tab 61

Figure B-25: Connection Type 62

Figure B-26: Rules 62

Figure B-27: Local Computer 62

Figure B-28: VPN Tab 63

Figure C-1: IP Configuration Screen 64

Figure C-2: MAC Address/Adapter Address 64

Figure C-3: MAC Address/Physical Address 65

Figure D-1: Upgrade Firmware 66

Chapter 1: Introduction

Welcome

ADSL2 Gateway with 4-Port Switch

Chapter1:Introduction

Welcome

The Linksys ADSL2 Gateway with 4-Port Switch is the all-in-one solution for Internet connectivity in your home.

The ADSL Modem function gives you a blazing fast connection to the Internet, far faster than a dial-up, and

without tying up your phone line.

Connect your computers to the Gateway via the built-in 4-port 10/100 Ethernet Switch to jump start your home

network. You can share files, printers, hard drive space and other resources, or play head-to-head computer

games. Attach four computers directly, or connect more hubs and switches to create as big a network as you

need. The Gateway ties it all together and lets your whole network share that high-speed Internet connection.

To protect your data and privacy, the ADSL2 Gateway with 4-Port Switch features an advanced firewall to keep

Internet intruders and attackers out. Wireless transmissions can be protected by powerful data encryption.

Safeguard your family with Parental Control features like Internet Access Time Limits and Key Word Blocking.

Configuration is a snap with any web browser.

With the Linksys ADSL2 Gateway with 4-Port Switch at the heart of your home network, you're connected to the

future.

Chapter 1: Introduction

What’s in this Guide?

ADSL2 Gateway with 4-Port Switch

What’s in this Guide?

This user guide covers the steps for setting up and using the ADSL2 Gateway with 4-Port Switch.

• Chapter 1: Introduction

This chapter describes the ADSL2 Gateway with 4-Port Switch ADSL2 Gateway with 4-Port Switch

applications and this User Guide.

• Chapter 2: Planning Your Network

This chapter describes the basics of networking.

• Chapter 3: Getting to Know the ADSL2 Gateway with 4-Port Switch

This chapter describes the physical features of the Gateway.

• Chapter 4: Connecting the ADSL2 Gateway with 4-Port Switch

This chapter instructs you on how to connect the Gateway to your network.

• Chapter 5: Configuring the 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 ADSL2 Gateway with 4-Port Switch.

• Appendix B: Configuring IPSec between a Windows 2000 Computer and the Gateway

This appendix instructs you on how to establish a secure IPSec tunnel using preshared keys to join a private

network inside the VPN Gateway and a Windows 2000 or XP computer.

• Appendix C: Upgrading Firmware

This appendix instructs you on how to upgrade the firmware on your Gateway if you should need to do so.

• Appendix D: 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 E: Glossary

This appendix gives a brief glossary of terms frequently used in networking.

• Appendix F: Specifications

This appendix provides the technical specifications for the Gateway.

Chapter 1: Introduction

What’s in this Guide?

ADSL2 Gateway with 4-Port Switch

• Appendix G: Warranty Information

This appendix supplies the warranty information for the Gateway.

• Appendix H: Regulatory Information

This appendix supplies the regulatory information regarding the Gateway.

• Appendix I: Contact Information

This appendix provides contact information for a variety of Linksys resources, including Technical Support.

Chapter 2: Planning Your Network

The Gateway’s Functions

ADSL2 Gateway with 4-Port Switch

Chapter2:PlanningYourNetwork

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 ADSL 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.

LAN: the computers and networking products that

make up your local 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.”

Figure 2-1: Network

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