problems with EN2511CD / NL2511CD

dean gaudet dean-list-hostap at arctic.org
Sat Dec 21 22:28:02 EST 2002


hi -- a couple weeks ago i was asking for assistance with an NL2511CD...
my schedule finally permitted me to collect the sniffing dumps which jouni
malinen asked me for.

the attached file was collected by "tethereal -s 1600"... i hope it helps!

i've included some more context below.

thanks
-dean

On Mon, 2 Dec 2002, dean gaudet wrote:

> i recently purchased an NL2511CD aka EN2511CD from netgate.com and i'm
> having troubles getting it to work with the latest hostap-2002-10-12 code.
>
> i've already had this laptop working as an AP with a linksys WPC11 prism2
> card, so i think i've got the basics covered.  i can also get the NL2511CD
> to work in a win2k laptop as a client, so i think the hardware works.
>
> the NL2511CD has these firmware revs:  (i've tried a bunch of others i
> found on the net)
>
> Dec  2 20:57:13 mewlark kernel: wlan0: NIC: id=0x800c v1.0.0
> Dec  2 20:57:13 mewlark kernel: wlan0: PRI: id=0x15 v1.1.0
> Dec  2 20:57:13 mewlark kernel: wlan0: STA: id=0x1f v1.4.9
>
> hostap doesn't complain about anything... but i can't associate with it.
> here's some attempts by my cisco350 to associate:
>
> Dec  2 20:57:23 mewlark kernel: wlan0: 00:40:96:5a:5d:ce auth (alg=0 trans#=1 stat=0 len=6fc=00b0) ==> 0 (authenticated)
> Dec  2 20:57:23 mewlark kernel: wlan0: 00:40:96:5a:5d:ce reassoc (len=32 prev_ap=00:03:2f:02:97:46) => 0(0) (OK, new AID)
>
> those go on for a while, but the cisco never manages to associate.
> (i tried a WPC11 as well, no luck either.)


On Tue, 3 Dec 2002, dean gaudet wrote:

> On Tue, 3 Dec 2002, Jouni Malinen wrote:
>
> > On Mon, Dec 02, 2002 at 10:59:24PM -0800, dean gaudet wrote:
> >
> > > Dec  2 22:46:51 mewlark kernel: wlan0: 00:40:96:5a:5d:ce auth (alg=0 trans#=1 stat=0 len=6 fc=00b0) ==> 0 (authOK)
> > > Dec  2 22:46:51 mewlark kernel: wlan0: 00:40:96:5a:5d:ce auth_cb - frame was not ACKed
> >
> > OK, that's the problem.. The station is not acknowledging authentication
> > frame from the AP (or at least the AP does not receive this ACK). Most
> > common reason for this is the delay between authentication frames being
> > too long. Some station firmware implementation seem to be quite strict
> > on this. Do you happen to have lot of wireless traffic on the same
> > channel? Is the AP host heavily loaded or is it writing kernel messages
> > to frame buffer or serial console?
>
> the problem happens with both a cisco 350 and a linksys WPC11 on the
> client side.
>
> there's no other wireless traffic on this channel (it's in my house and
> none of my neighbours are using wireless) ... there could be other types
> of 2.4GHz interference, but i've been testing with the client and AP
> within 1m of each other.
>
> no load on the AP host.
>
> > The best method for researching the problem would be to use a third host
> > as a wireless sniffer and record the frame exchange between the station
> > and the AP. I would like to be sure that the authentication reply from
> > the AP is really going out and that the station is not sending an ACK
> > for it.
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