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Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for Linux

OL-1376-02

Chapter 4 Enabling Security Features

Using the Client Encryption Manager

This section explains how to use the Client Encryption Manager (CEM) portion of the ACU to use static

Wired Equivalent Privacy (WEP) keys for your client adapter or to use server-based authentication and

dynamic WEP keys.

WEP

The ACU enables you to set up to four encryption keys, called WEP keys, for your client adapter. WEP

is an optional IEEE 802.11 feature that provides your client adapter and other devices on your wireless

network with data confidentiality. Using WEP involves packet-by-packet data encryption by the

transmitting device and decryption by the receiving device.

Server-Based Authentication

Server-based authentication through IEEE 802.1x is ideal for organizations with a large user base. To

use server-based authentication, your access point must communicate with a RADIUS server, such as

Cisco Secure ACS 2.6, with support for an 802.1x for an 802.11 authentication type like LEAP.

You can enable server-based authentication for your client adapter through its firmware and Cisco

software (referred to as LEAP). This method provides authentication service to client adapters whose

host devices are not running an operating system with built-in EAP support. The term LEAP is used to

distinguish authentication provided by the client firmware from authentication provided by a host and

its operating system.

LEAP is enabled through the Set LEAP Username and Password screen in the ACU. The username and

password entered in this screen are used by the client adapter to authenticate to the RADIUS server and

must be re-entered at the start of each new session.

Getting Started

You can access client encryption functions from the ACU main screen by clicking the CEM tab. The

CEM pull-down menu appears, providing the following options:

• Change Password

• Enter WEP key(s)

The Change CEM Password option allows you to change the current password.

If your client adapter supports WEP, the Enter WEP keys option allows you to enter up to four WEP keys.

Changing the Password

Follow these steps to change the current CEM password.

Note Passwords are case-sensitive and can contain up to 256 characters. The default password is Cisco

(uppercase C followed by lowercase isco).

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