XP sends "deauthentication" after ieee802_1x authentication finishs

[yuannong at emobilenetworks.com]

Quoting Gunter Burchardt <gbur at informatik.uni-rostock.de>:

> > Hi,
> > 
> > I encontered a very strange problem with following setting:
> > 
> >  Hostap driver 0.2.4, Linux2.4, and WindowsXP as a client. The problem
> comes
> > when I turn on i802.1x authentication by using freeradius. The
> authentication method
> > is PEAP.
> > 
> >  In fact everything works pretty well. The i802.1x authentication works
> fine,
> > but several seconds after the i802.1x authentication finishs, XP always
> sends
> > out a ieee802.11 "deauthentication" frame with reason code 3:(Station has
> left
> > the basic service area..)
> > 
> > Is this an XP problem, or AP problem?
> 
> I think the problem is that XP doesn't get encryption keys. In this
> case windows closes the connection. Please set debug to debug and look
> if keys were transmittet to XP after authentication. Hostapd has 5
> seconds to transmit these keys. After this time windows drops
> connection. These keys comes from radius. Look if there are entrys like
> 
> MS-MPPE-Send-Key (len=32): f8 f2 59 64 0c a4 70 73 0f 4...
> MS-MPPE-Recv-Key (len=32): ac 84 cb 32 12 d8 3d 82 3c 3...
> 
> in your hostapd log.
> 
> regards
> gunter
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> 


Thank you so much. I found keys are not sent because I didn't configure
"wep_key_len_broadcast" and "wep_key_len_unicast". I though it is 
not necessary if we don't do the rekey, which is wrong.

Thank you again.

-yuannong