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Other vendors equipment cannot authenticate with Cisco devices using 128-bit WEP

Core Issue

The IEEE 802.11b specification defines only 40-bit Wired Equivalent Privacy (WEP). Cisco and other vendors have independently extended the specification by implementing their own versions of 128-bit WEP, which may not be compatible with each other.

Resolution

If WEP is required between devices from different manufacturers, configure all such devices to use 40-bit WEP.

Problem Type

Associated but cannot pass any traffic

Client / Device cannot authenticate

Products

Access point

WLAN adapters (wireless card) / ACU (Aironet Client Utility)

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