From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-iy0-f171.google.com (mail-iy0-f171.google.com [209.85.210.171]) (using TLSv1 with cipher RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority" (verified OK)) by huchra.bufferbloat.net (Postfix) with ESMTPS id BCCE8201AFB for ; Fri, 6 May 2011 12:37:20 -0700 (PDT) Received: by iyi20 with SMTP id 20so4580212iyi.16 for ; Fri, 06 May 2011 12:42:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=p9DsTDNdlhKMHkJ8nNRufeQka/GJFQSJj7zrM6SfaSQ=; b=hgoG0e4+Pbi+MnCpdptFOE8/TJyG1aFZ0klmWYu48LeJrzsHFIaKqAd0MG94CtgyHG C3Y7U+U9GSTKNrOSUUfa7ZZcYLS3FBcUdbC6hvlzhoZOlrk9Ls2yFaZvKLYO9qFF4toI atF3BjVyPmHcGMvV2ZHPzTfZg+C9mDm5Cd3rA= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=tFDSAa56gaUpFcOkNs5MLXP9OF1rrmAQ66Vec5krBMrbE8QzIM0sHLJVZYFS9xqTov 65ZRT6uPAtkjNjBGF0jxF/6xeHW4qtIROvtDXC38cfkMn01rk/R9pI8+2fRFRvYAqWCv 8b0+/3Px9dXBKc6rJdklkoZcXSBLYie7F49pE= MIME-Version: 1.0 Received: by 10.231.117.7 with SMTP id o7mr2587558ibq.46.1304710944097; Fri, 06 May 2011 12:42:24 -0700 (PDT) Received: by 10.231.33.204 with HTTP; Fri, 6 May 2011 12:42:24 -0700 (PDT) In-Reply-To: <5D1A6041-9ACA-450A-BE9B-F9415F697C65@gmail.com> References: <4DA67BBE.9050606@taht.net> <1303145028.24248.1442482225@webmail.messagingengine.com> <1304695674.3066.57.camel@edumazet-laptop> <5D1A6041-9ACA-450A-BE9B-F9415F697C65@gmail.com> Date: Fri, 6 May 2011 13:42:24 -0600 Message-ID: From: Dave Taht To: Jonathan Morton Content-Type: multipart/alternative; boundary=005045015a6b5b858e04a2a0b0e9 Cc: Bufferbloat Mainlinglist Subject: Re: [Bloat] No ECN marking in IPv6 linux X-BeenThere: bloat@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: General list for discussing Bufferbloat List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 May 2011 19:37:21 -0000 --005045015a6b5b858e04a2a0b0e9 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Fri, May 6, 2011 at 12:18 PM, Jonathan Morton wro= te: > > On 6 May, 2011, at 9:14 pm, Dave Taht wrote: > > > I am curious as to what the correct behavior here should be for > encapsulated (6in4, 6to4, teredo) packets, and if this functionality was > also borked. I was under the impression that for encapsulated packets the > tos field was copied from the encapsulated packet to the ipv4 header. > > Intuitively, these protocols are at the same level as IP in the stack, so > they should preserve ECN information as much as possible. Copying the TO= S > field should be sufficient... > > My concern here is that a AQM-aware (ECN) qdisc such as SFB on the external interface will not recognize a flow for what it is, when encapsulated... --=20 Dave T=E4ht SKYPE: davetaht US Tel: 1-239-829-5608 http://the-edge.blogspot.com --005045015a6b5b858e04a2a0b0e9 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Fri, May 6, 2011 at 12:18 PM, Jonatha= n Morton <chr= omatix99@gmail.com> wrote:

On 6 May, 2011, at 9:14 pm, Dave Taht wrote:

> I am curious as to what the correct behavior here should be for encaps= ulated (6in4, 6to4, teredo) packets, and if this functionality was also bor= ked. I was under the impression that for encapsulated packets the tos field= was copied from the encapsulated packet to the ipv4 header.

Intuitively, these protocols are at the same level as IP in the stack= , so they should preserve ECN information as much as possible. =A0Copying t= he TOS field should be sufficient...


My concern here is= that a AQM-aware (ECN) qdisc such as SFB on the external interface will no= t recognize a flow for what it is, when encapsulated...


--
Dave T=E4ht
SKYPE: davetaht
US Tel:= 1-239-829-5608
http://the-edge.blogspot.com
--005045015a6b5b858e04a2a0b0e9--