From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tore Anderson Subject: Re: [RFC] ipv6: =?UTF-8?Q?dst=5Fallfrag=28=29=20not=20taken=20into=20acco?= =?UTF-8?Q?unt=20by=20TCP?= Date: Wed, 18 Jan 2012 16:14:40 +0100 Message-ID: <184325098dff696295968e09accafa9d@localhost> References: <1326817699.2259.32.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> <4F15D417.4050005@fud.no> <1326831948.2606.2.camel@edumazet-laptop> <00f1ef555b452980aae95eb3028072f8@localhost> <1326895569.2316.14.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> <9903c7bcb83314b495e7378dae23e703@localhost> <1326898746.2316.19.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev To: Eric Dumazet Return-path: Received: from greed.fud.no ([87.238.35.20]:36512 "EHLO greed.fud.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757652Ab2ARPOm (ORCPT ); Wed, 18 Jan 2012 10:14:42 -0500 In-Reply-To: <1326898746.2316.19.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC> Sender: netdev-owner@vger.kernel.org List-ID: * Eric Dumazet > Le mercredi 18 janvier 2012 =C3=A0 15:43 +0100, Tore Anderson a =C3=A9= crit : >=20 >> Another way of solving it and avoiding the Fragmentation headers >> altogether would be to allow the "route MTU" to drop below 1280 as a >> result of Path MTU Discovery. I opened an enchancement bug report >> requesting this: >>=20 >> https://bugzilla.kernel.org/show_bug.cgi?id=3D42599 >=20 > Please dont open bugzilla entries for this kind of stuff, since there= is > no bug in this case. Okay...but then what is the =C2=ABenhanchement=C2=BB severity's intende= d use? > netdev is more appropriate to discuss future improvements. No problem. Bottom line, I'd like a "min_pmtu" IPv6 sysctl or something similar that would allow me to configure it so that the kernel would=20 accept an arbitrary low PMTU being received in an ICMPv6 PTB. That=20 would prevent having to deal with the Fragmentation headers completely. Best regards, --=20 Tore Anderson