TKIP test

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Dear all,

I am testing TKIP cipher iwth hostap driver. My environment is,

Kernel: Linux 2.4.23 (5x86 machine)
WLAN: netgate el-2511MP 11b CARD
Firmware : SF 1.8.0

I set up two systems with hostap driver and set TKIP key as follows,
hostap_crypt_conf wlan0 ff:ff:ff:ff:ff:ff TKIP 111111122222222333333334444444455555555666666667777777788888888 (64 char)

I test with Master/Maste (wds) and Master/Managed(infrastructure) combination.
In Master/Master combination the MIC tx/rx part is exchanged.
In all case they can communicate (PINGable).
But one thing I cannot understand is;
  "I should change the keys of both entitites almost simultaneously."
I think it requires a few seconds.
Even if I set the same key again, the link is broken and other party should be
set again right after.
When I change key of AP, STA key should be changed within 1~2(?) seconds.
Is it working principle of TKIP ? Does it require time sychronicity for key update ?

Obrian Kant


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