Netgear Double 108 Mbps Wireless PC Card WG511U User Manual download pdf (Page 62)

User’s Manual for the NETGEAR Double 108 Mbps Wireless PC Card 32-bit CardBus WG511U

B-10 Wireless Networking Basics

August 2004

When configured for 128-bit encryption, 802.11 products typically support four WEP Keys but

some manufacturers support only one 128-bit key. The 128-bit WEP Key is expressed as 13 sets of

two hexadecimal digits (0-9 and A-F). For example, “12 34 56 78 90 AB CD EF 12 34 56 78 90”

is a 128-bit WEP Key.

Typically, 802.11 access points can store up to four 128-bit WEP Keys but some 802.11 client

adapters can only store one. Therefore, make sure that your 802.11 access and client adapters

configurations match.

• WEP Key Configuration

Whatever keys you enter for an AP, you must also enter the same keys for the client adapter in the

same order. In other words, WEP key 1 on the AP must match WEP key 1 on the client adapter,

WEP key 2 on the AP must match WEP key 2 on the client adapter, etc.

Note: The AP and the client adapters can have different default WEP Keys as long as the keys are

in the same order. In other words, the AP can use WEP key 2 as its default key to transmit while a

client adapter can use WEP key 3 as its default key to transmit. The two devices will communicate

as long as the AP’s WEP key 2 is the same as the client’s WEP key 2 and the AP’s WEP key 3 is

the same as the client’s WEP key 3.

How to Use WEP Parameters

Wired Equivalent Privacy (WEP) data encryption is used when the wireless devices are configured

to operate in Shared Key authentication mode. There are two shared key methods implemented in

most commercially available products, 64-bit and 128-bit WEP data encryption.

Before enabling WEP on an 802.11 network, you must first consider what type of encryption you

require and the key size you want to use. Typically, there are three WEP Encryption options

available for 802.11 products:

1. Does Not Use WEP: The 802.11 network does not encrypt data. For authentication purposes,

the network uses Open System Authentication.

2. Uses WEP for Encryption: A transmitting device encrypts the data portion of every packet it

sends using a configured WEP Key. The receiving device decrypts the data using the same WEP

Key. For authentication purposes, the network uses Open System Authentication.

3. Uses WEP for Authentication and Encryption: A transmitting device encrypts the data

portion of every packet it sends using a configured WEP Key. The receiving device decrypts the

data using the same WEP Key. For authentication purposes, the network uses Shared Key

Authentication.

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Netgear Double 108 Mbps Wireless PC Card WG511U User Manual Page 62