Linksys WRT54Gv4 Router Manual PDF (Setup & Configuration Guide)

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Wireless-G Broadband Router

Instant Wireless

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Step One: Pinging an IP Address

The first step to determining your ISP’s web and e-mail server address is to

ping its IP address.

Power on the computer and the cable or DSL modem, and restore the net-

work configuration set by your ISP if you have since changed it.

2. Click

Start

and then

Run

. Type

command

in the

Open

field. This will

bring up the DOS window.

At the DOS command prompt, type

ping mail

(assuming that the location

for which you’re trying to find an IP address is configured as

mail

). Press

the

Enter

key. Information such as the following data, taken from a ping of

Microsoft Network’s e-mail server, will be displayed.

C:\>ping mail

Pinging mail [24.53.32.4] with 32 bytes of data:

Reply from 24.53.32.4: bytes=32 time<10ms TTL=128

Ping statistics for 24.53.32.4:

Packets: Sent = 4, Received = 4, Lost = 0 (0%

loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum =

0ms, Average =

0ms

Write down the IP address returned by the ping command (in the example

above: 24.53.32.4.). This IP address is the actual IP address of the server

mail

, or any other word or value you have pinged.

Figure B-1

Appendix B: How to Ping Your

ISP’s E-mail & Web Addresses

Virtually all Internet addresses are configured with words or characters (e.g.,

www.linksys.com

www.yahoo.com

, etc.) In actuality, however, these Internet

addresses are assigned to IP addresses, which are the true addresses on the

Internet. For example,

www.yahoo.com

is 66.218.71.87 (this IP address may

change). Type it into your web browser and you will wind up at the Linksys

home page every time. There are servers that translate the URL to an IP

address; this is called the Domain Name System (DNS).

IP and web addresses, however, can sometimes be long and hard to remember.

Because of this, certain ISPs will shorten their server addresses to single words

or codes on their users’ web browser or e-mail configurations. If your ISP’s e-

mail and web server addresses are configured with single words (

www

e-mail

home

pop3

, etc.) rather than whole Internet addresses or IP addresses, the

Router may have problems sending or receiving mail and accessing the

Internet. This happens because the Router has not been configured by your ISP

to accept their abbreviated server addresses.

The solution is to determine the true web addresses behind your ISPs code

words. You can determine the IP and web addresses of your ISP’s servers by

“pinging” them.

Important

: If you don’t have your ISP’s web and e-mail IP

addresses, you

must

either get them from your ISP or follow these

steps

prior

to connecting the Router to your network.

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Wireless-G Broadband Router

Instant Wireless

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Appendix C: Configuring

Wireless Security

An acronym for Wired Equivalent Privacy, WEP is an encryption method used

to protect your wireless data communications.

WEP uses 64-bit or 128-bit keys

to provide access control to your network and encryption security for every

data transmission.

To decode a data transmission, each point in a network must

use an identical 64-bit or 128-bit key.

Higher encryption levels mean higher

levels of security, but due to the complexity of the encryption, they may mean

decreased network performance.

You may also have heard the term “40-bit” used in conjunction with WEP

encryption.

This is simply another term for 64-bit WEP encryption.

This level

of WEP encryption has been called 40-bit because it uses a 40-bit secret key

along with a 24-bit Initialization Vector (40 + 24 = 64).

Wireless vendors may

use either name.

Linksys uses the term “64-bit” when referring to this level of

encryption. All wireless devices compliant with the 802.11b standard will sup-

port 64-bit WEP.

Make sure your wireless network is functioning before attempting to configure

WEP encryption.

In addition to enabling WEP, Linksys also recommends the following security

implementations:

•

Change the SSID from the default “linksys”

•

Change the SSID on a regular basis

•

Change the WEP key regularly

•

Enable wireless MAC address filtering (see the “Advanced Wireless” section

of “Chapter 6: The Router’s Web-Based Utility”)

For instructions on how to configure the WEP settings of your PC’s wireless

adapter, refer to your wireless adapter’s documentation. To configure the

Router’s WEP settings, follow these instructions:

Note:

WEP encryption is an additional data security measure and not

essential for router operation; however, Linksys recommends the use

of WEP encryption.

Step Two: Pinging for a Web Address

While the IP address returned above would work as your e-mail server address,

it may not be permanent. IP addresses change all the time. Web addresses, how-

ever, usually don’t. Because of this, you’re likely to have fewer problems by

configuring your system with web addresses rather than IP addresses. Follow

the instructions below to find the web address assigned to the IP address you

just pinged.

At the DOS command prompt, type

ping -a 24.53.32.4

, where 24.53.32.4

is the IP address you just pinged. Information such as the following data

will be displayed.

C:\>ping -a 24.53.32.4

Pinging mail.msnv3.occa.home.com [24.53.32.4] with

32 bytes of data:

Reply from 24.53.32.4: bytes=32 time<10ms TTL=127

Ping statistics for 24.53.32.4:

Packets: Sent = 4, Received = 4, Lost = 0 (0%

loss),

Approximate round trip times in milli-seconds:

Minimum = 0ms, Maximum =

0ms, Average =

0ms

Write down the web address returned by the ping command. (In the exam-

ple in Figure C-2,

mail.msnv3.occa.home.com

is the web address.) This

web address is the web address assigned to the IP address you just pinged.

While the IP address of

mail

could conceivably change, it is likely that this

web address will not.

Replace your ISP’s abbreviated server address with this extended web

address in the corresponding Internet application (web browser, e-mail

application, etc.).

Once you have replaced the brief server address with the true server address,

the Router should have no problem accessing the Internet through that Internet

application.

Figure B-2

Page 48 / 61

Wireless-G Broadband Router

WEP keys enable you to create an encryption scheme for wireless LAN

transmissions. If you are not using a Passphrase, then manually enter a set

of values in each

Key

field. (Do not leave a key field blank, and do not enter

all zeroes. These are not valid key values.)

If you are using 64-bit WEP encryption, then the key must be exactly 10

hexadecimal characters in length. If you are using 128-bit WEP encryption,

then the key must be exactly 26 hexadecimal characters in length. Valid

hexadecimal characters are “0”-“9” and “A”-“F”.

Check all the values, and click the

Apply

button to save your WEP settings

and return to the

Setup

screen. To cancel any changes you’ve entered on this

page, click the

Cancel

button.

To get more information about the features,

click the

Help

button.

Instant Wireless

Series

On the

Setup

tab of the Router’s web-based utility, click the

Enable

radio

button next to

WEP

. Then click the

Edit WEP Settings

button.

You will see the

2.4GHz, 54g, Wireless-G (WEP)

screen (Figure C-1). Next

Default Transmit Key

, select which WEP key (1-4) will be used when the

Router sends data. Make sure the receiving device is using the same key.

For the

WEP Encryption

drop-down box, select the level of WEP encryp-

tion you wish to use,

64-bit 10 hex digits

128-bit 26 hex digits

. Higher

encryption levels offer higher levels of security, but due to the complexity

of the encryption, they may decrease network performance.

Instead of manually entering WEP keys, you can enter a Passphrase in the

Passphrase

field. This Passphrase is used to generate one or more WEP

keys. It is case-sensitive and should not be longer than 16 alphanumeric

characters. (This Passphrase function is compatible with Linksys wireless

products only. If you want to communicate with non-Linksys wireless prod-

ucts, enter the WEP key manually on the non-Linksys wireless products.)

After you enter the Passphrase, click the

Generate

button to create WEP

keys.

Note:

All Wireless-G and 802.11b devices in your network must use

the same Passphrase or WEP key.

Figure C-1

Page 49 / 61

Wireless-G Broadband Router

Write down the Adapter Address as shown on your computer screen (see

Figure E-3).

This is the MAC address for your Ethernet adapter and will

be shown as a series of numbers and letters.

The MAC address/Adapter Address is what you will use for MAC address

cloning or MAC filtering.

Write down the IP Address as shown on your computer screen. The exam-

ple in Figure E-3 shows the IP address of your Ethernet adapter as

192.168.1.100. Your computer may show something different.

For Windows NT, 2000, and XP:

1. Click

Start

and

Run

. In the

Open

field, enter

cmd

. Press the

Enter

key or

click the

button.

Instant Wireless

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Appendix D: Finding the MAC

Address and IP Address for Your

Ethernet Adapter

This section describes how to find the MAC address for your Ethernet adapter

to do either MAC address filtering or MAC address cloning for the Router and

ISP.

You can also find the IP address of your computer’s Ethernet adapter.

The

IP address is used for filtering, forwarding, and DMZ.

Follow the steps in this

appendix to find the MAC address or IP address for your adapter in Windows

95, 98, Me, NT, 2000, and XP.

For Windows 95, 98, and Me:

1. Click on

Start

and

Run

. In the Open field, enter

winipcfg

. Then press the

Enter

key or the

button.

2. When the IP Configuration window appears, select the Ethernet adapter

you are using to connect to the Router via a Category 5 Ethernet network

cable.

Figure D-3

Figure D-4

Note

: The MAC address is also called the Adapter

Address.

Figure D-1

Figure D-2

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Wireless-G Broadband Router

Instant Wireless

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In the command prompt, enter

ipconfig /all

. Then press the

Enter

key.

Write down the Physical Address as shown on your computer screen; it is

the MAC address for your Ethernet adapter.

This will appear as a series of

letters and numbers.

The MAC address/Physical Address is what you will use for MAC address

cloning or MAC filtering.

Write down the IP Address as shown on your computer screen. The exam-

ple in Figure E-5 shows the IP address of your Ethernet adapter as

192.168.1.100. Your computer may show something different.

Appendix E: Glossary

10BaseT

- An Ethernet standard that uses twisted wire pairs.

100BaseTX

- IEEE physical layer specification for 100 Mbps over two pairs of

Category 5 UTP or STP wire.

802.11b

- One of the IEEE standards for wireless networking hardware.

Products that adhere to a specific IEEE standard will work with each other,

even if they are manufactured by different companies. The 802.11b standard

specifies a maximum data transfer rate of 11Mbps, an operating frequency of

2.4GHz, and WEP encryption for security. 802.11b networks are also referred

to as Wi-Fi networks.

802.1g

- A proposed, but as yet unratified extension of the IEEE 802.11 stan-

dard for wireless networking hardware. The draft 802.11g specifications used

by Linksys specify a maximum data transfer rate of 54Mbps using OFDM

modulation, an operating frequency of 2.4GHz, backward compatibility with

IEEE 802.11b devices, and WEP encryption for security.

Adapter -

Printed circuit board that plugs into a PC to add to capabilities or

connectivity to a PC. In a networked environment, a network interface card

(NIC) is the typical adapter that allows the PC or server to connect to the

intranet and/or Internet.

Ad-hoc Network

- An ad-hoc network is a group of computers, each with a

wireless adapter, connected as an independent 802.11 wireless LAN.

Ad-hoc

wireless computers operate on a peer-to-peer basis, communicating directly

with each other without the use of an access point.

Ad-hoc mode is also

referred to as an Independent Basic Service Set (IBSS) or as peer-to-peer

mode, and is useful at a departmental scale or SOHO operation.

Automatic Fall-back

- A feature provided by some wireless products to

increase connection reliability. Automatic fall-back enables a device to dynam-

ically shift between various data transfer rates. It works by decreasing the data

transfer rate when interference increases, distance increases, and other factors

undermine signal strength and quality.

Auto-MDI/MDIX

- On a network hub or switch, an auto-MDI/MDIX port

automatically senses if it needs to act as a MDI or MDIX port. The auto-

MDI/MDIX capability eliminates the need for crossover cables.

Figure D-5

Note

: The MAC address is also called the Physical

Address.

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