Re: WEP key rotation

From: Jouni Malinen (
Date: 2002-07-08 18:37:38 UTC

On Sun, 30 Jun 2002 at 17:46:29 -0400, Ross Skaliotis wrote:

> It defaults to using the first key, which is fine. According to the
> iwconfig docs, I should be able to say `iwconfig wlan0 key [2]` and have
> it switch to key2. This doesn't work with the hostap driver. Running that
> command disables wep key encryption all together.

There was a bug in SIOCSIWENCODE handler that disabled WEP when TX idx was changed. Current CVS version has a fix for this.

> I have to disable wep key encryption and then re-enable it with my script
> before the active transmitting key can change. A few packets get dropped
> when this happens. Is there any way around this? I'm using version 3 of
> the Linksys wpc11 (prism3 chipset).

CVS version seems to now work at least when using host_decrypt. However, there seems to be some problems when using firmware for WEP decryption (at least with the firmware version I tested, 0.7.6). It looked like keyidx changing breaks something and firmware did not even ACK all frames after the change.

Jouni Malinen                                            PGP id EFC895FA

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