Linksys WRT54Gv4 Router Manual PDF (Setup & Configuration Guide)

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Wireless-G Broadband Router

The

Security

screen allows you to change the Router’s security settings. You

should change the factory default password, which is

admin

, to your own as

soon as possible. All users who try to access the Router’s web-based utility or

Setup Wizard will be prompted for the Router’s password.

Router Password

The new Password must not exceed 32 characters in length

and must not include any spaces. Enter the new Password in the second field to

confirm it.

VPN Pass-Through

Virtual Private Networking (VPN) is typically used for

work-related networking. For VPN tunnels, the Router supports IPSec Pass-

Through and PPTP Pass-Through.

IPSec

- Internet Protocol Security (IPSec) is a suite of protocols used to

implement secure exchange of packets at the IP layer. To allow IPSec tun-

nels to pass through the Router, IPSec Pass-Through is enabled by default.

To disable IPSec Pass-Through, uncheck the box next to

IPSec

Security

Figure 6-8

Instant Wireless

Series

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.

WEP Encryption

Select the level of WEP encryption 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.

Passphrase

Instead of manually entering WEP keys, you can enter a

Passphrase. 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 products, enter

the WEP key manually on the non-Linksys wireless products.) After you

enter the Passphrase, click the

Generate

button to create WEP keys.

Keys 1-4

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. (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.

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.

Note:

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

the same Passphrase or WEP key.

Page 22 / 61

Wireless-G Broadband Router

Block WAN Request

By enabling the Block WAN Request feature, you can

prevent your network from being “pinged,” or detected, by other Internet users.

The Block WAN Request feature also reinforces your network security by hid-

ing your network ports. Both functions of the Block WAN Request feature

make it more difficult for outside users to work their way into your network.

This feature is enabled by default. Select

Disable

to disable this feature.

To save your changes on this page, click the

Apply

button. To cancel any

unsaved changes on this page, click the

Cancel

button. To get more information

about the features, click the

Help

button.

The

System

screen lets you control a variety of the Router’s general features,

from restoring factory defaults to enabling its remote management capability.

Restore Factory Defaults

Click the

Yes

button to reset all configuration set-

tings to their default values, and then click the

Apply

button. Any settings you

have saved will be lost when the default settings are restored. This feature is

disabled by default.

Instant Wireless

Series

PPTP

- Point-to-Point Tunneling Protocol is the method used to enable VPN

sessions to a Windows NT 4.0 or 2000 server. To allow PPTP tunnels to pass

through the Router, PPTP Pass-Through is enabled by default. To disable

PPTP Pass-Through, uncheck the box next to

PPTP

Web Filters

Using the Web Filters feature, you may enable up to four specif-

ic filtering methods.

Block Proxy

- Use of WAN proxy servers may compromise the Router's

security. Denying Proxy will disable access to any WAN proxy servers. To

enable proxy filtering, click the

Block Proxy

box.

Block Java

- Java is a programming language for websites. If you deny Java,

you run the risk of not having access to Internet sites created using this pro-

gramming language. To enable Java filtering, click the

Block Java

box.

Block ActiveX

- ActiveX is a programming language for websites. If you

deny ActiveX, you run the risk of not having access to Internet sites creat-

ed using this programming language. To enable ActiveX filtering, click the

Block ActiveX

box.

Block Cookies

- A cookie is data stored on your PC and used by Internet

sites when you interact with them. To enable cookie filtering, click the

Block Cookies

box.

DMZ

The DMZ hosting feature allows one local user to be exposed to the

Internet for use of a special-purpose service such as Internet gaming or video-

conferencing. DMZ hosting forwards all the ports at the same time to one PC.

The Port Forwarding feature is more secure because it only opens the ports you

want to have opened, while DMZ hosting opens all the ports of one computer,

exposing the computer so the Internet can see it.

Any PC whose port is being forwarded must have its DHCP client function dis-

abled and should have a new static IP address assigned to it because its IP

address may change when using the DHCP function.

To expose one PC, select

Enable

Enter the computer's IP address in the

DMZ Host IP Address

field.

3. Click the

Apply

button.

Figure 6-9

System

Page 23 / 61

Wireless-G Broadband Router

Multicast Pass-Through

IP Multicasting occurs when a single data transmis-

sion is sent to multiple recipients at the same time.

Using the Multicast Pass-

Through feature, the Router allows IP multicast packets to be forwarded to the

appropriate computers. Keep the default setting,

Enable

, to support the feature,

or select

Disable

to disable it.

MAC Cloning

You can clone the MAC address of your PC’s network adapter

onto the Router.

A MAC address is a 12-digit code assigned to a unique piece of hardware for

identification. Some ISPs require that you register the MAC address of your

PC’s network adapter, which was connected to your cable or DSL modem dur-

ing installation. To avoid calling your ISP and changing the MAC address that

is registered with the ISP, follow these instructions:

Select

Enable

Enter your adapter’s MAC address in the

MAC Address

field.

To save your new settings, click the

Apply

button. To cancel your changes,

click the

Cancel

button. To get more information about the features, click

the

Help

button.

To disable MAC address cloning, keep the default setting,

Disable

If you do not know your adapter’s MAC address, follow these instructions:

1. Click the

Start

button, and select

Run

2. Enter

command

in the field provided, and press the

button.

At the command prompt, enter

ipconfig /all

. Then press the

Enter

key.

4. Write down your adapter’s physical address; this is the adapter’s MAC

address.

Remote Management

This feature allows you to manage your Router from a

remote location, via the Internet. To disable this feature, keep the default set-

ting,

Disable

. To enable this feature, select

Enable

, and use the specified port

(default is

8080

) on your PC to remotely manage the Router. You must also

change the Router's default password to one of your own, if you haven’t

already. A unique password will increase security.

Instant Wireless

Series

Upgrade Firmware

New firmware versions are posted at

www.linksys.com

and can be downloaded for free. If the Router already works well, there’s no

need to download a newer firmware version, unless that version has a new fea-

ture that you want to use. (To learn about any new firmware with new features,

visit

www.linksys.com

To upgrade the Router’s firmware:

1. Download the firmware upgrade file from

www.linksys.com

, and extract

the file using a file archive utility such as WinZip.

2. Click the

Upgrade

button.

3. On the

Upgrade Firmware

screen (see Figure 6-10), click the Browse but-

ton to find the firmware upgrade file you extracted.

Double-click the firmware upgrade file you extracted.

5. Click the

Upgrade

button, and follow the on-screen instructions.

Figure 6-10

Important:

When you are upgrading the firmware, do NOT turn off

the Router, and do NOT press the Reset button.

Note:

By upgrading the Router’s firmware, you may lose the Router’s

configuration settings, so make sure you write down the Router’s set-

tings before you upgrade its firmware.

Page 24 / 61

Wireless-G Broadband Router

The Outgoing Access Log gives you a log of all outgoing Internet traffic. For

each activity, it displays the LAN IP address, the Destination URL or IP

address of the Internet site accessed, as well as the Service/Port Number used

(see Figure 6-12). Click the

Refresh

button to update the logs. Click the

button to return to the

System

screen.

To save your changes on this page, click the

Apply

button. To cancel any

unsaved changes on this page, click the

Cancel

button. To get more information

about the features, click the

Help

button.

Instant Wireless

Series

To remotely manage the Router, enter

http://xxx.xxx.xxx.xxx:8080

(the x’s

represent the Router's Internet IP address, and 8080 represents the specified

port) in your web browser’s

Address

field. You will be asked for the Router’s

password. After successfully entering the password, you will be able to access

the Router’s web-based utility.

MTU

MTU is the Maximum Transmission Unit. It specifies the largest pack-

et size permitted for Internet transmission. Keep the default setting,

Auto

, to

have the Router select the best MTU for your Internet connection. To specify a

MTU size, select

Manual

, and enter the value desired (default is

1400

You

should leave this value in the 1200 to 1500 range.

Log

The Router can keep logs of all traffic for your Internet connection. To

disable the Log function, keep the default setting,

Disable

. To monitor traffic

between the network and the Internet, select

Enable

Temporary logs can be accessed by clicking either the

Incoming Access Log

Outgoing Access Log

button.

The Incoming Access Log gives you a log of all the incoming Internet traffic,

displaying the Source IP address and Destination Port Number of the Router

for each activity (see Figure 6-11). Click the

Refresh

button to update the logs.

Click the

button to return to the

System

screen.

Note:

If the Remote Management feature is enabled, anyone who

knows the Router’s Internet IP address and password will be able to

alter the Router’s settings.

Figure 6-11

Figure 6-12

Page 25 / 61

Wireless-G Broadband Router

Instant Wireless

Series

Number of DHCP Users

(Optional) Enter the maximum number of PCs that

you want the DHCP server to assign IP addresses to. This number cannot be

greater than 253. The default is

Client Lease Time

The Client Lease Time is the amount of time a network

user will be allowed connection to the Router with their current dynamic IP

address. Enter the amount of time, in minutes, that the user will be “leased” this

dynamic IP address. After the time is up, the user will be automatically

assigned a new dynamic IP address. The default is

minutes, which means one

day.

Static DNS 1-3

The Domain Name System (DNS) is how the Internet trans-

lates domain or website names into Internet addresses or URLs. Your ISP will

provide you with at least one DNS Server IP Address. If you wish to use anoth-

er, type that IP Address in one of these fields. You can type up to three DNS

Server IP Addresses here. The Router will use these for quicker access to func-

tioning DNS servers.

WINS

The Windows Internet Naming Service (WINS) manages each PC’s

interaction with the Internet. If you use a WINS server, enter that server’s IP

Address here. Otherwise, leave this blank.

Currently Assigned: DHCP Clients Table

Click the

DHCP Clients Table

button to view the list of PCs that are given IP addresses by the Router (see

Figure 6-14). For each PC, the list shows the Client Hostname, IP Address,

MAC Address, and and the amount of DHCP client lease time left. Click the

Refresh

button to display the most current information.

To save your changes on this page, click the

Apply

button. To cancel any

unsaved changes on this page, click the

Cancel

button. To get more information

about the features, click the

Help

button.

Figure 6-14

The

DHCP

screen allows you to configure the settings for the Router’s Dynamic

Host Configuration Protocol (DHCP) server function. The Router can be used as

a DHCP server for your network. A DHCP server automatically assigns an IP

address to each computer on your network.

If you choose to enable the Router’s DHCP server option, you must configure all

of your network PCs to connect to a DHCP server (the Router), and make sure

there is no other DHCP server on your network.

DHCP Server

DHCP is enabled by factory default. If you already have a

DHCP server on your network, or you don’t want a DHCP server, then click the

Disable

radio button (no other DHCP features will be available).

Starting IP Address

Enter a value for the DHCP server to start with when

issuing IP addresses.

Because the Router’s default IP address is

192.168.1.1

the Starting IP Address must be 192.168.1.2 or greater, but smaller than

192.168.1.253. The default Starting IP Address is

192.168.1.100

DHCP

Figure 6-13

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