From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jouni Malinen" Subject: Re: softmac mtu Date: Thu, 28 Sep 2006 08:45:15 -0700 Message-ID: <20060928154515.GA9615@instant802.com> References: <1159365434.451a833ae7728@imp3-g19.free.fr> <1159365316.2698.40.camel@ux156> <200609281735.17616.mb@bu3sch.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Johannes Berg , Jiri Benc , "John W. Linville" , netdev@vger.kernel.org, castet.matthieu@free.fr Return-path: Received: from dhost002-41.dex002.intermedia.net ([64.78.21.130]:12496 "EHLO dhost002-41.dex002.intermedia.net") by vger.kernel.org with ESMTP id S965058AbWI1PpW (ORCPT ); Thu, 28 Sep 2006 11:45:22 -0400 To: Michael Buesch Content-Disposition: inline In-Reply-To: <200609281735.17616.mb@bu3sch.de> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Thu, Sep 28, 2006 at 05:35:17PM +0200, Michael Buesch wrote: > On Wednesday 27 September 2006 15:55, Johannes Berg wrote: > > On Wed, 2006-09-27 at 15:57 +0200, castet.matthieu@free.fr wrote: > > > Also I wonder what should be the max mtu. > > > > 2304, I think, as that's > > synonym sMaxMsduLng Integer = 2304; /* max octets in an MSDU */ > > > > But maybe I'm interpreting the spec wrongly? > > Yes, I think so. ;) > > I am pretty sure this is the maximum _fragment_ size. > But each packet (which max size is defined by the MTU) can > be fragmented. I don't know if there's a limit on the max > number of frags. No it's not. How about reading the standard.. ;-) Take a look at how MSDU and MPDU are defined.. MSDU can be fragmented into smaller MPDUs, but the limit here is indeed for MSDU, not MPDU. In other words, fragmentation in IEEE 802.11 is different from fragmentation in IP and it is also used for different purpose. -- Jouni Malinen PGP id EFC895FA