From owner-freebsd-wireless@FreeBSD.ORG  Mon Jun 11 16:28:50 2012
Return-Path: <owner-freebsd-wireless@FreeBSD.ORG>
Delivered-To: freebsd-wireless@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1614A1065675
	for <freebsd-wireless@freebsd.org>;
	Mon, 11 Jun 2012 16:28:50 +0000 (UTC)
	(envelope-from adrian.chadd@gmail.com)
Received: from mail-pz0-f54.google.com (mail-pz0-f54.google.com
	[209.85.210.54])
	by mx1.freebsd.org (Postfix) with ESMTP id DBD4D8FC0C
	for <freebsd-wireless@freebsd.org>;
	Mon, 11 Jun 2012 16:28:49 +0000 (UTC)
Received: by dadv36 with SMTP id v36so5893319dad.13
	for <freebsd-wireless@freebsd.org>;
	Mon, 11 Jun 2012 09:28:49 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
	h=mime-version:sender:in-reply-to:references:date
	:x-google-sender-auth:message-id:subject:from:to:cc:content-type;
	bh=lu/fGkm244kw/fP63C5s85H+L9hpTGf8nduPfN64JAc=;
	b=zPSA/dEt2+IMgLV+GVk41M8eT8Q2/haEO/GZhqInTwkcVSKrneN5A9YxdluElaODvH
	s4blFXwBfy4BTpre24RZLCoMqvEGabG+4/+O47BHMqH0eOs2oCq0kaN+4PIVq7ZlJ6Kg
	eEumX8xdl0hAkbkCwYPJwUG9dCDDWORdufFNyTJNNmHNPREgRQ4vvIxopB2FH0wqwqmE
	luha2dTL+VY7ilCZNPCRjSTXPR/jldXG2S9CFJQoLtbfH/Qmb0WWQaEjkDLTEnkDi7Yx
	3sY+LoflhJLfyClm9YPFL/DaXRgwuoozMwO4GCoxcw76zd6XFV4IwHTV8hyXCKTe0dH4
	+I4w==
MIME-Version: 1.0
Received: by 10.68.226.226 with SMTP id rv2mr29645853pbc.101.1339432129583;
	Mon, 11 Jun 2012 09:28:49 -0700 (PDT)
Sender: adrian.chadd@gmail.com
Received: by 10.143.91.18 with HTTP; Mon, 11 Jun 2012 09:28:49 -0700 (PDT)
In-Reply-To: <CA+sBSo+KF-OABC8v=3hPfn433Lhi2wkcP3Q+5Hu9H+HnpC2kGw@mail.gmail.com>
References: <CA+sBSo+KF-OABC8v=3hPfn433Lhi2wkcP3Q+5Hu9H+HnpC2kGw@mail.gmail.com>
Date: Mon, 11 Jun 2012 09:28:49 -0700
X-Google-Sender-Auth: QuMouUoPbsm3GM1Spnc65V26Hdg
Message-ID: <CAJ-VmonwquHPh+HcDDU0u1SNRf_eG6sRs_kVg-geaN=wGwUEsw@mail.gmail.com>
From: Adrian Chadd <adrian@freebsd.org>
To: Monthadar Al Jaberi <monthadar@gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Cc: freebsd-wireless@freebsd.org
Subject: Re: AP <-> STA: tcpdump shows duplicate ARP request from STA,
 but STA only sends one.
X-BeenThere: freebsd-wireless@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: "Discussions of 802.11 stack,
	tools device driver development." <freebsd-wireless.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-wireless>, 
	<mailto:freebsd-wireless-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-wireless>
List-Post: <mailto:freebsd-wireless@freebsd.org>
List-Help: <mailto:freebsd-wireless-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-wireless>, 
	<mailto:freebsd-wireless-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 11 Jun 2012 16:28:50 -0000

Hi!

The "null frame" is from hostap. It sends it out whenever a new
station (re) joins. It's a broadcast frame that's harmless, designed
to "seed" all the switches with the true location of the MAC address.

As for dup packets, I'm not sure. Hm!



Adrian