From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Frederic Sowa Subject: Re: DSCP of ICMPv6 Echo Reply not copied from Echo Request Date: Fri, 10 Jan 2014 05:40:49 +0100 Message-ID: <20140110044049.GC1012@order.stressinduktion.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: Simon Schneider Return-path: Received: from order.stressinduktion.org ([87.106.68.36]:53091 "EHLO order.stressinduktion.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750702AbaAJEku (ORCPT ); Thu, 9 Jan 2014 23:40:50 -0500 Content-Disposition: inline In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: Hello! On Wed, Jan 08, 2014 at 03:34:42PM +0100, Simon Schneider wrote: > with kernel version 2.6.33.32, I noticed for ping6 that the DSCP valu= e of an Echo Request is not used for the corresponding Echo Reply. > =C2=A0 > With ICMPv4, this is the case and I think it makes sense. > =C2=A0 > This is not mandated by ICMP RFCs, but there are good reasons to use = the same DSCP in both directions. Yes, IMHO we should do that, especially because DSCP is sometimes used = for policy routing. > Is there a specific reason for this difference between v4 and v6? > =C2=A0 > Or was it even fixed in some newer kernel version? Quick test showed no, I'll follow-up on this soon. Greetings, Hannes