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Cisco Aironet Wireless LAN Client Adapters Installation and Configuration Guide for Windows
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Chapter 5 Configuring the Client Adapter
Setting Network Security Parameters
Note
If you enable MIC on the access point, your client adapter’s driver must support these features;
otherwise, the client cannot associate.
Temporal Key Integrity Protocol (TKIP)
This feature, also referred to as WEP key hashing, defends against an attack on WEP in which the
intruder uses the initialization vector (IV) in encrypted packets to calculate the WEP key. TKIP removes
the predictability that an intruder relies on to determine the WEP key by exploiting IVs. It protects both
unicast and broadcast WEP keys.
Note
If you enable TKIP on the access point, your client adapter’s firmware must support these features;
otherwise, the client cannot associate.
Broadcast Key Rotation
EAP authentication provides dynamic unicast WEP keys for client devices but uses static broadcast, or
multicast, keys. When you enable broadcast WEP key rotation, the access point provides a dynamic
broadcast WEP key and changes it at the interval you select. When you enable this feature, only wireless
client devices using LEAP, EAP-TLS, PEAP, or EAP-SIM authentication can associate to the access
point. Client devices using static WEP (with open, shared key, or EAP-MD5 authentication) cannot
associate.
Synchronizing Security Features
In order to use any of the security features discussed in this section, both your client adapter and the
access point to which it will associate must be set appropriately.
Table 5-6
indicates the client and access
point settings required for each security feature. This chapter provides specific instructions for enabling
the security features on your client adapter. Refer to the Software Configuration Guide for your access
point for instructions on enabling any of these features.
Table 5-6
Client and Access Point Security Settings
Security Feature
Client Setting
Access Point Setting
Static WEP with open
authentication
Create a WEP key and enable Use
Static WEP Keys and Open
Authentication
Set up and enable WEP and enable
Open Authentication
Static WEP with shared key
authentication
Create a WEP key and enable Use
Static WEP Keys and Shared Key
Authentication
Set up and enable WEP and enable
Shared Key Authentication
LEAP authentication
Enable LEAP
Set up and enable WEP and enable
Network-EAP
