Linksys WRT51AB Router Manual PDF (Setup & Configuration Guide)

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Dual-Band Wireless A+B Broadband Router

Instant Wireless

Series

5GHz, 802.11a (WEP)

The

5GHz, 802.11a (WEP)

screen allows you to configure your 5GHz,

802.11a WEP settings. WEP encryption should always be enabled to

increase the security of your wireless network.

WEP Encryption

Keys 1-4 offer 64-bit, 128-bit, or 152-bit encryption;

select the type of encryption you want from the drop-down box. To disable

WEP Encryption, select

Disable

Default Transmit Key

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

Router sends data. Make sure the receiver is using the same key.

Keys 1-4

WEP keys enable you to create an encryption scheme for wireless

LAN transmissions. 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.)

Keys 1-4 offer 64-bit, 128-bit, or 152-bit encryption.

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. If you are

using 152-bit WEP encryption, then the key must be exactly 32 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 5GHz, 802.11a

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.

2.4GHz, 802.11b

The

2.4GHz, 802.11b

screen allows you to configure your 2.4GHz, 802.11b

network settings.

SSID

The SSID is the network name shared among all points in a wireless

network. The SSID must be identical for all points in the wireless network.

It is case-sensitive and must not exceed 32 characters (use any of the char-

acters on the keyboard). Make sure this setting is the same for all points in

your wireless network. For added security, you should change the default

SSID (

linksys

) to a unique name.

Channel

Select the appropriate channel from the list provided to corre-

spond with your network settings, between 1 and 11 (in North America). All

devices in your wireless network must use the same channel in order to

function correctly.

Figure 6-11

Figure 6-10

Page 22 / 69

Dual-Band Wireless A+B Broadband Router

Instant Wireless

Series

Default Transmit Key

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

Router sends data. Make sure the receiver is using the same key.

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(s) 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. 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.)

Keys 1-4 offer 64-bit or 128-bit encryption.

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 2.4GHz,

802.11b WEP settings.

To apply any of the settings you change on this page, click the

Apply

button.

cancel any changes you’ve entered on this page, click the

Cancel

button. To get

more information about the features, click the

Help

button.

WEP (Encryption)

An acronym for Wired Equivalent Privacy, WEP is an

encryption method used to protect your wireless data communications.

WEP uses a combination of 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 device in a network must use an identical

64-bit or 128-bit key. Higher encryption levels offer higher levels of securi-

ty, but due to the complexity of the encryption, they may decrease network

performance. Click the

2.4GHz WEP Settings

button to configure the

WEP keys for your 2.4GHz, 802.11b network (see Figure 6-12).

Check all the values, and click the

Apply

button to save your 2.4GHz,

802.11b 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.

2.4GHz, 802.11b (WEP)

The

2.4GHz, 802.11b (WEP)

screen allows you to configure your 2.4GHz,

802.11b WEP settings. WEP encryption is recommended to increase the

security of your wireless network.

WEP Encryption

Keys 1-4 offer 64-bit or 128-bit encryption; select the

type of encryption you want from the drop-down box. To disable WEP

Encryption, select

Disable

Figure 6-12

Page 23 / 69

Dual-Band Wireless A+B Broadband Router

Instant Wireless

Series

The

Status

screen displays the Router’s current status and configuration. All

information is read-only.

Status

Figure 6-14

Note:

The information provided and buttons available may vary

depending on the Router’s settings.

The

Password

screen allows you to change the Router’s password. 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 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.

Restore Factory Defaults

Click the

Yes

button to reset all configuration set-

tings to their default values. Any settings you have saved will be lost when the

default settings are restored. Click the

button to disable the Restore Factory

Defaults feature.

To apply any of the settings you change on this page, click the

Apply

button.

cancel any changes you’ve entered on this page, click the

Cancel

button. To get

more information about the features, click the

Help

button.

Password

Figure 6-13

Page 24 / 69

Dual-Band Wireless A+B Broadband Router

Internet

Configuration Type

The type of Internet connection is displayed here.

Status

For PPPoE or PPTP, the status of the Internet connection is displayed

here. If there is no connection, you can click the

Connect

button to re-estab-

lish it. If there is a connection, you can click the

Disconnect

button to end it.

IP Address, Subnet Mask, and Default Gateway

The Router’s IP Address,

Subnet Mask, and Default Gateway Address, as seen by external users on the

Internet, are displayed here.

DNS

The DNS (Domain Name System) IP Addresses currently used by the

Router are shown here. Multiple DNS IP settings are common. In most cases,

the first available DNS entry is used.

DHCP Release

Click the

DHCP Release

button to delete the Router’s current

Internet IP address.

DHCP Renew

Click the

DHCP Renew

button to get a new Internet IP

address for the Router.

To refresh the

Status

screen, click the

Refresh

button. To get more information

about the features, click the

Help

button.

Instant Wireless

Series

Host Name

The Host Name is the name of the Router. This entry is necessary

for some ISPs.

Domain Name

The Domain Name is the name of the Router's domain. This

entry is necessary for some ISPs.

Firmware Version

The version number of the firmware currently installed is

displayed here.

LAN

IP Address and Subnet Mask

The current IP Address and Subnet Mask of

the Router, as seen by users on your local area network (LAN), are displayed

here.

DHCP Server

The status of the Router's DHCP server function is displayed

here.

Wireless 5GHz, 802.11a

SSID

The SSID of the 5GHz, 802.11a network is displayed here.

Encryption Function

The status of the WEP encryption is displayed here.

Channel

The channel for the 5GHz, 802.11a wireless network is displayed

here.

Wireless 2.4GHz, 802.11b

SSID

The SSID of the 2.4GHz, 802.11b network is displayed here.

Encryption Function

The status of the WEP encryption is displayed here.

Channel

The channel for the 2.4GHz, 802.11b wireless network is displayed

here.

Page 25 / 69

Dual-Band Wireless A+B Broadband Router

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

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. 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 apply any of the settings you change on this page, click the

Apply

button.

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

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.

If you disable the Router’s DHCP server function, you must have a separate

DHCP server for your network, or you must configure the IP Address, Subnet

Mask, and DNS for each network computer (make sure each IP Address is

unique).

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.

DHCP

Figure 6-15

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