Return-path: Received: from mail-vx0-f174.google.com ([209.85.220.174]:43543 "EHLO mail-vx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751414Ab2BTHMf (ORCPT ); Mon, 20 Feb 2012 02:12:35 -0500 Received: by vcge1 with SMTP id e1so3438315vcg.19 for ; Sun, 19 Feb 2012 23:12:34 -0800 (PST) MIME-Version: 1.0 Date: Mon, 20 Feb 2012 15:12:34 +0800 Message-ID: (sfid-20120220_081238_273130_92F81A95) Subject: AP send null-data packet? From: Yingang Fu To: linux-wireless@vger.kernel.org Content-Type: text/plain; charset=UTF-8 Sender: linux-wireless-owner@vger.kernel.org List-ID: hi, all It is wired that my AP send the station a null-date packet. As i know that this packet could only been sent by the station. Under which case the AP will send out this type of packet? Thanks