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    CWSP Certified Wireless Security Professional Official Study Guide: Exam PW0-204
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    Shawn Jackman (Jack) CWNE#54 is a personal friend and has been a mentor to me for many years.  I've had the pleasure and opportunity to work with Jack for 4 years. Jack is a great teacher who takes complex 802.11 standards and breaks them down so almost anyone can understand the concept at hand. I'm excited for you brother. Great job and job well done! Put another notch in the belt!

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Tuesday
Dec292009

Configure TKIP Countermeasure Holdoff Timer on WLC

After having worked on countless Cisco WLAN VoIP deployments a general rule of thumb from Cisco TAC is to disable TKIP countermeasure on ALL voice WLANs and lessen the timer for DATA WLANs. Again this is all subject to your comfort level and performance requirements. Personally, I can't say I have ever seen this to be an issue or had an issue that was directly related to the countermeasure. But something to chew on!

TKIP countermeasure mode can occur if the Access Point receives 2 message integrity check (MIC) errors within a 60 second period. When this occurs, the Access Point will de-authenticate ALL TKIP clients associated to that 802.11 radio and holdoff any clients for the countermeasure holdoff time (default = 60 seconds).


(Cisco Controller)config wlan security <tkip> hold-down <seconds> <wlan id>

Note:  Configures TKIP MIC countermeasures hold-down timer (0-60 seconds)


The following command disables TKIP countermeasure on WLAN 1 

(Cisco Controller) >config wlan security tkip hold-down 0 1

 

Reader Comments (1)

Thanks for the command we are getting ready to implement VoIP on the WLAN and this just saved me some time. Thanks!

March 23, 2010 | Unregistered CommenterSteve Di Bias

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