From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) by huchra.bufferbloat.net (Postfix) with ESMTP id 6B3BC21F113 for ; Mon, 17 Jun 2013 00:35:24 -0700 (PDT) Received: from u-090-csam110a.zmbp.uni-tuebingen.de ([134.2.90.47]) by mail.gmx.com (mrgmx103) with ESMTPSA (Nemesis) id 0M5csW-1UQBqk0DqC-00xZWv; Mon, 17 Jun 2013 09:35:22 +0200 Content-Type: text/plain; charset=iso-8859-1 Mime-Version: 1.0 (Mac OS X Mail 6.5 \(1508\)) From: Sebastian Moeller In-Reply-To: Date: Mon, 17 Jun 2013 09:35:23 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <5A07FB3F-F967-4EC2-9578-2DC82B4498F6@gmx.de> References: <8738shsx3w.fsf@toke.dk> <87vc5drhdj.fsf@toke.dk> <87bo75rgp5.fsf@toke.dk> <8738shrd0p.fsf@toke.dk> To: Dave Taht X-Mailer: Apple Mail (2.1508) X-Provags-ID: V03:K0:XmRRSNpZaXUZzrmdOwTfIEfR+mJNogzIB07C8u1542US/mE3jgr WwopJmpC1tgS+rtKP2BFzreMsf42E5OLjv2u58YVXQ6y8MoB+pVfrgiBJQ4pCFPdZccRdFt n+rw9C18yLu9Pa4I6BsKDkbYZJcjiJuF87p/SGb2+Ba4dTH2eVl5Sy+hrBH7MIo84m93/tU texbQCIyfJJenIL5/KeNA== Cc: =?iso-8859-1?Q?Toke_H=F8iland-J=F8rgensen?= , cerowrt-devel@lists.bufferbloat.net Subject: Re: [Cerowrt-devel] trivial 6in4 fix(?) X-BeenThere: cerowrt-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: Development issues regarding the cerowrt test router project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Jun 2013 07:35:24 -0000 Hi Dave, hi Toke, On Jun 16, 2013, at 22:57 , Dave Taht wrote: > On Sun, Jun 16, 2013 at 1:55 PM, Toke H=F8iland-J=F8rgensen = wrote: >> Sebastian Moeller writes: >>=20 >>> As far as I can tell at least VDSL typically means VDSL2 and that >>> probably means PTM instead of ATM. In essence this means you do not >>> have to deal with ATMs 48 payload bytes per 53 byte cell transport >>> inefficiencies. So all you need to deal with is per packet overhead. >>> Then again I am sure you probably know that already. (Sidenote, as = far >>> as I understand (so not very far) using ATM for DSL connections with >>> POTS service in the lower frequency range never made much sense at >>> all, the 5 byte ATM header typically was constant and by that just >>> ballast and the 48 byte quantization on the last mile never came = with >>> any benefits, but I digress) >>=20 >> Right, thanks. So that means the overhead is constant per (ethernet) >> package? >=20 > So what's the MTU on VSDL2? Is PPPOE used? Easy to figure out empirically by hand, by finding the largest = ping packet size that still passes without fragmentation (see = http://www.debian.org/doc/manuals/debian-reference/ch05.en.html#_finding_o= ptimal_mtu) Best Sebastian >=20 >> -Toke >=20 >=20 >=20 > --=20 > Dave T=E4ht >=20 > Fixing bufferbloat with cerowrt: = http://www.teklibre.com/cerowrt/subscribe.html