63

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

How to Establish a Secure IPSec Tunnel

ADSL2 Gateway with 4-Port Switch

Step 5: Create a Tunnel Through the Web-Based Utility

1.

Open your web browser, and enter

192.168.1.1

in the Address field. Press the

Ente

r key.

2.

When the User name and Password field appears, enter the default user name and password

admin

. Press

the

Enter

key.

3.

From the

Setup

tab, click the

VPN

tab.

4.

From the

VPN

tab, shown in Figure C-28, select the tunnel you wish to create in the

Select Tunnel Entry

drop-

down box. Then click

Enabled

. Enter the name of the tunnel in the

Tunnel Name

field.

This is to allow you to

identify multiple tunnels and does not have to match the name used at the other end of the tunnel.

5.

Enter the IP Address and Subnet Mask of the local VPN Router in the

Local Secure Group

fields. To allow

access to the entire IP subnet, enter 0 for the last set of IP Addresses. (e.g. 192.168.1.0).

6.

Enter the IP Address and Subnet Mask of the VPN device at the other end of the tunnel (the remote VPN Router

or device with which you wish to communicate) in the

Remote Security Router

fields.

7.

Select fromtwo different types of encryption:

DES

or

3DES

(3DES is recommended because it is more secure).

You may choose either of these, but it must be the same type of encryption that is being used by the VPN

device at the other end of the tunnel.

Or, you may choose not to encrypt by selecting Disable.

8.

Select from two types of authentication:

MD5

and

SHA

(SHA is recommended because it is more secure).

As

with encryption, either of these may be selected, provided that the VPN device at the other end of the tunnel

is using the same type of authentication.

Or, both ends of the tunnel may choose to

Disable

authentication.

9.

Select the Key Management. Select

Auto (IKE)

and enter a series of numbers or letters in the

Pre-shared Key

field. Check the box next to

PFS

(Perfect Forward Secrecy) to ensure that the initial key exchange and IKE

proposals are secure. You may use any combination of up to 24 numbers or letters in this field. No special

characters or spaces are allowed. In the

Key Lifetime

field, you may optionally select to have the key expire at

the end of a time period of your choosing.

Enter the number of seconds you’d like the key to be useful, or

leave it blank for the key to last indefinitely.

10. Click the

Save Settings

button to save these changes.

Your tunnel should now be established.

Figure B-28: VPN Tab

64

Appendix C: Finding the MAC Address and IP Address for Your Ethernet Adapter

Windows 98 or Me Instructions

ADSL2 Gateway with 4-Port Switch

Appendix C: Finding the MAC Address and IP Address for

Your Ethernet Adapter

This section describes how to find the MAC address for your computer’s Ethernet adapter so you can use the MAC

filtering feature of the Gateway. You can also find the IP address of your computer’s Ethernet adapter. This IP

address is used for the Gateway’s filtering, forwarding, and/or DMZ features. Follow the steps in this appendix to

find the adapter’s MAC or IP address in Windows 98, Me, 2000, or XP.

Windows 98 or Me Instructions

1.

Click

Start

and

Run

. In the

Open

field, enter

winipcfg

. Then press the

Enter

key or the

OK

button.

2.

When the

IP Configuration

screen appears, select the Ethernet adapter you have connected to the Gateway

via a CAT 5 Ethernet network cable. See Figure D-1.

3.

Write down the Adapter Address as shown on your computer screen (see Figure D-2). This is the MAC address

for your Ethernet adapter and is shown in hexadecimal as a series of numbers and letters.

The MAC address/Adapter Address is what you will use for MAC filtering. The example in Figure D-2 shows

the Ethernet adapters’s MAC address as 00-00-00-00-00-00. Your computer will show something different.

The example in Figure D-2 shows the Ethernet adapter’s IP address as 192.168.1.100. Your computer may

show something different.

Figure C-2: MAC Address/Adapter

Address

Figure C-1: IP Configuration Screen

Note:

The MAC address is also called the Adapter Address.

65

Appendix C: Finding the MAC Address and IP Address for Your Ethernet Adapter

Windows 2000 or XP Instructions

ADSL2 Gateway with 4-Port Switch

Windows 2000 or XP Instructions

1.

Click

Start

and

Run

. In the

Open

field, enter

cmd

. Press the

Enter

key or click the

OK

button.

2.

At the command prompt, enter

ipconfig /all

. Then press the

Enter

key.

3.

Write down the Physical Address as shown on your computer screen (Figure D-3); it is the MAC address for

your Ethernet adapter. This appears as a series of numbers and letters.

The MAC address/Physical Address is what you will use for MAC filtering. The example in Figure D-3 shows

the Ethernet adapters’s MAC address as 00-00-00-00-00-00. Your computer will show something different.

The example in Figure E-3 shows the Ethernet adapter’s IP address as 192.168.1.100. Your computer may

show something different.

Figure C-3: MAC Address/Physical Address

Note:

The MAC address is also called the Physical Address.

66

Appendix D: Upgrading Firmware

ADSL2 Gateway with 4-Port Switch

Appendix D: Upgrading Firmware

The ADSL Gateway allows you to upgrade firmware for the LAN (network) side of the Gateway through the Web-

Utility's Firmware Upgrade tab from the Administration tab. Follow these instructions:.

Upgrade from LAN

To upgrade the Gateway’s firmware from the LAN:

1.

Click the

Browse

button to find the firmware upgrade file that you downloaded from the Linksys website and

then extracted.

2.

Double-click the firmware file you downloaded and extracted.

Click the

Upgrade

button, and follow the

instructions there.

Figure D-1: Upgrade Firmware

67

Appendix E: Glossary

ADSL2 Gateway with 4-Port Switch

Appendix E: Glossary

802.11a

- An IEEE wireless networking standard that specifies a maximum data transfer rate of 54Mbps and an

operating frequency of 5GHz.

802.11b

- An IEEE wireless networking standard that specifies a maximum data transfer rate of 11Mbps and an

operating frequency of 2.4GHz.

802.11g

- An IEEE wireless networking standard that specifies a maximum data transfer rate of 54Mbps, an

operating frequency of 2.4GHz, and backward compatibility with 802.11b devices.

Access Point

- Device that allows wireless-equipped computers and other devices to communicate with a wired

network. Also used to expand the range of a wireless network.

Adapter

- This is a device that adds network functionality to your computer.

Ad-hoc

- A group of wireless devices communicating directly with each other (peer-to-peer) without the use of

an access point.

Backbone

- The part of a network that connects most of the systems and networks together, and handles the

most data.

Bandwidth

- The transmission capacity of a given device or network.

Beacon Interval

- The frequency interval of the beacon, which is a packet broadcast by a Gateway to

synchronize a wireless network.

Bit

- A binary digit.

Boot

- To start a device and cause it to start executing instructions.

Bridge

- A device that connects two different kinds of local networks, such as a wireless network to a wired

Ethernet network.

Broadband

- An always-on, fast Internet connection.

Browser

- A browser is an application program that provides a way to look at and interact with all the

information on the World Wide Web.