Subject: kern/36719: Several problems with wpi(4) and WEP or WPA
To: None <email@example.com, firstname.lastname@example.org,>
From: None <email@example.com>
Date: 08/01/2007 19:25:00
>Synopsis: Several problems with wpi(4) and WEP or WPA
>Arrival-Date: Wed Aug 01 19:25:00 +0000 2007
>Originator: Havard Eidnes
>Release: NetBSD 4.99.26
System: NetBSD xxx.urc.uninett.no 4.99.26 NetBSD 4.99.26 (GENERIC) #29: Wed Aug 1 11:14:15 CEST 2007 firstname.lastname@example.org:/usr/obj/sys/arch/i386/compile/GENERIC i386
I am trying to make use of an Intel 3945 wireless card
on a Lenovo T60 laptop.
I am observing various problems related to this.
The same problems appear with NetBSD 4.99.23 with wireless
firmware version 2.14.3 and NetBSD 4.99.26 with wireless
firmware version 2.14.4.
1) If you have the interface up without any nwid or
nwkey configured, and subsequently configure an nwid
and nwkey for use with WEP, you get "wpi0: fatal firmware error",
usually followed by "wpi0: timeout waiting for adapter
to initialize" and possibly "wpi0: could not load
Usually the workaround is to down the interface (if
it isn't already at this point), and "up" it afterwards.
This sypmtom also occurs if you change nwid + nwkey (we
have a couple of possible local combinations).
2) Attempts at associating with WPA using wpa_supplicant
may result in an association, but no address is given in
response to a dhclient request. Sniffing the traffic
received on wpi0 reveals that all the unicast
traffic appears scrambled, as none of the frames appear
as IP packets to tcpdump, but instead "sap aa ui/C frames
with relatively short length (39 - 47). This sounds like
a mis-configured key in the wireless driver.
I am pretty certain that this is not a defect
of our local wireless infrastructure; it works fine
with my other laptop which has an Atheros wireless
3) The ability to successfully associate using WEP appears
to be somewhat spurious. Sometimes it works, sometimes
it does not. Sometimes rebooting the kernel may restore
the driver to working order, even if it has basically
only run ifconfig and dhclient up to then.
When WEP appears to be troublesome, it is also impossible
to even get an association using WPA.
So, usage of the Intel 3945 wireless cards looks pretty
fragile at this point, I'm sad to say.
Try to use an Intel 3945 wireless card with currentish
versions of NetBSD with either WEP or WPA, and watch it
just barely work in 4.99.23 and not at all with 4.99.26.
Sorry, I have absolutely no idea.
Hints for digging out more useful information for
further diagnosis is however gratefully accepted.