From owner-freebsd-mobile@FreeBSD.ORG Fri Jun 20 08:02:00 2003 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 3377D37B401 for ; Fri, 20 Jun 2003 08:01:59 -0700 (PDT) Received: from fnord.ir.bbn.com (FNORD.IR.BBN.com [192.1.100.210]) by mx1.FreeBSD.org (Postfix) with ESMTP id CCD9A43FBD for ; Fri, 20 Jun 2003 08:01:58 -0700 (PDT) (envelope-from gdt@ir.bbn.com) Received: by fnord.ir.bbn.com (Postfix, from userid 10853) id 75E84231F; Fri, 20 Jun 2003 11:01:58 -0400 (EDT) To: mobile@freebsd.org From: Greg Troxel Date: 20 Jun 2003 11:01:58 -0400 Message-ID: Lines: 22 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Subject: acks, and RTS/CTS in IBSS mode? X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 20 Jun 2003 15:02:00 -0000 Has anyone been able to determine if various cards send acknowledgements for unicast frames in IBSS mode? As I understand 802.11, in a BSS (infrastructure mode with an AP), unicast packets to STAs from APs, and perhaps all packets from STAs to APs, get acknowledged, and are retransmitted at the link layer. With 'adhoc demo mode' (-p 3), I am pretty sure there are no acks of any kind, and no beacons. With IBSS mode, I believe that unicast packets should have acks and retransmission, but I have never determined whether this is actually the case. I have long been suspicious of firmware for IBSS mode since it isn't the typical case. Further, one should be able to configure a lower RTS/CTS threshold in order to perform RTS/CTS processing, which should help avoid the hidden terminal problem. Has anyone verified that this works? If so, with which cards? -- Greg Troxel