IETF Logo Mail Archive

Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt

Mark ZZZ Smith <markzzzsmith@yahoo.com.au> Wed, 26 June 2013 10:56 UTC

Return-Path: <markzzzsmith@yahoo.com.au>
X-Original-To: ipv6@ietfa.amsl.com
Delivered-To: ipv6@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 65E7611E81B5 for <ipv6@ietfa.amsl.com>; Wed, 26 Jun 2013 03:56:54 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -2.099
X-Spam-Level:
X-Spam-Status: No, score=-2.099 tagged_above=-999 required=5 tests=[BAYES_00=-2.599, FROM_LOCAL_NOVOWEL=0.5]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 3h37yeC08hso for <ipv6@ietfa.amsl.com>; Wed, 26 Jun 2013 03:56:49 -0700 (PDT)
Received: from nm35-vm5.bullet.mail.bf1.yahoo.com (nm35-vm5.bullet.mail.bf1.yahoo.com [72.30.238.77]) by ietfa.amsl.com (Postfix) with ESMTP id D1A6D11E81B2 for <ipv6@ietf.org>; Wed, 26 Jun 2013 03:56:48 -0700 (PDT)
Received: from [98.139.212.149] by nm35.bullet.mail.bf1.yahoo.com with NNFMP; 26 Jun 2013 10:56:47 -0000
Received: from [98.139.212.220] by tm6.bullet.mail.bf1.yahoo.com with NNFMP; 26 Jun 2013 10:56:47 -0000
Received: from [127.0.0.1] by omp1029.mail.bf1.yahoo.com with NNFMP; 26 Jun 2013 10:56:47 -0000
X-Yahoo-Newman-Property: ymail-3
X-Yahoo-Newman-Id: 522187.37864.bm@omp1029.mail.bf1.yahoo.com
Received: (qmail 94119 invoked by uid 60001); 26 Jun 2013 10:56:47 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com.au; s=s1024; t=1372244207; bh=YXR9XiIIB+9s4dvBbMdL3ol4Z6RbtKls8qH1fQfTIzI=; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=a3EV32+CMWMWuBYIrZG+Ar+/iAbThxHuo17TCUhbTuIrgy8CCLb17DtPAauxlYmJRw2b7JqZMpgq2zdH+hukQHFk+2MTvGSUZ/xeaxlH0hglSTGvRVHhClQPu0E9XDJodqHpwhBPJYUxbfo8LVaOR5xFq34Z+BvtFbcVxcx1Y1I=
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com.au; h=X-YMail-OSG:Received:X-Rocket-MIMEInfo:X-Mailer:References:Message-ID:Date:From:Reply-To:Subject:To:Cc:In-Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=sj2nepjFVW8jqTYG36Y77BfLueGNaI+GtBM/HyVm+OzK/zAq2xI7YwewblrfQMi9dgWrk4bhLaAQnGebhO5kwqRXbmmnT8jOEYYDvjDJ95n8WlWqLK6hy4UEZjfrvj55yC+bIDEpod1w5RL/zONiHIv1gvdj4G/qjiU3VVdS1VA=;
X-YMail-OSG: BaIlYhIVM1mIn2CKMkYG085SoIbc99Sbjpj8Hg39xFriaVN Ex4loKBYTCub6WbOruUHKYOIWxWCmwQq8D936h3b6J9bT.azvNCHYriLoyl0 xwBYHivRTZ_XN3GPN0ZlLFRbNKXGR9MQ9Vb6GGrO5Y8zYGkJJbN6iVsbhM0n fDx0NOuuAcHnptQCQdtqhu.PCPiIYy97reBuBQ0FbQutx06TY0xgZXqsnNV8 IXAbnQfeJXpcTiBhcyW2VtjFjWoWjDqX77Z0j0WVe1Loq5Hzt_aCFhKXFuxk ciF_Lg.oCbxXZzex7DBAy_R0FkdOAQ1IfPZptttL3FJDtLowPRS4eQmYLzcX PysMDMqjl5BM...kNiO13A6cf7m31BTYlI8wAbXnVnuT9hyEV9fQ5ZK8PkMB F3pDDqqyhC9OsbgVwf8BC6bP9PPjoJ5ff0f_4YyDs7jVnKlGuuGxxf1JK78K Itki2_s9COW4XGqYYmr9eLRAykjswTgk9yKnKKIRJGblkX79eevfD6WPqGhN F8cgI4HFdO7.6iOcclfhvjyPgeaQa0MfCNlt7lsonyhhbwA0FMyIHcat9ZJ_ LwvH0XEnlI4XvS.3ahjzQ7adlova5RwD8JQHL3AeP0_tEne0GqoWLtSHVOHP Mx411S.UMInDMpOGOg6VvvR2QS_cLvOwOE9qDjU7W23jgsZYjvIC2myRGtFe zlX1TVDHpiirgvd5lNw--
Received: from [121.200.231.211] by web142505.mail.bf1.yahoo.com via HTTP; Wed, 26 Jun 2013 03:56:47 PDT
X-Rocket-MIMEInfo: 002.001, CgoKCi0tLS0tIE9yaWdpbmFsIE1lc3NhZ2UgLS0tLS0KPiBGcm9tOiBGcmVkIEJha2VyIChmcmVkKSA8ZnJlZEBjaXNjby5jb20.Cj4gVG86IFJhbmR5IEJ1c2ggPHJhbmR5QHBzZy5jb20.Cj4gQ2M6IElQdjYgRGVwbG95bWVudCBQcmV2ZW50aW9uIDxpcHY2QGlldGYub3JnPgo.IFNlbnQ6IFdlZG5lc2RheSwgMjYgSnVuZSAyMDEzIDE6MzAgUE0KPiBTdWJqZWN0OiBSZTogTmV3IFZlcnNpb24JTm90aWZpY2F0aW9uCWZvcgoJZHJhZnQtYm9uaWNhLTZtYW4tZnJhZy1kZXByZWNhdGUtMDAudHh0Cj4gCj4gCj4BMAEBAQE-
X-Mailer: YahooMailWebService/0.8.148.554
References: <2CF4CB03E2AA464BA0982EC92A02CE2509F85151@BY2PRD0512MB653.namprd05.prod.outlook.com> <51C32FA9.1090207@gmail.com> <2CF4CB03E2AA464BA0982EC92A02CE2509F85F38@BY2PRD0512MB653.namprd05.prod.outlook.com> <20130624204008.GB3647@virgo.local> <20130624205226.GC3647@virgo.local> <2CF4CB03E2AA464BA0982EC92A02CE2509F8761C@BY2PRD0512MB653.namprd05.prod.outlook.com> <51C902DC.9000408@gmail.com> <m24ncmaozs.wl%randy@psg.com> <2EA20F89-02F5-4D06-90EE-A7D2974045A3@employees.org> <m2li5yj7u3.wl%randy@psg.com> <8C48B86A895913448548E6D15DA7553B9268E3@xmb-rcd-x09.cisco.com>
Message-ID: <1372244207.93298.YahooMailNeo@web142505.mail.bf1.yahoo.com>
Date: Wed, 26 Jun 2013 03:56:47 -0700
From: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
Subject: Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
To: "Fred Baker (fred)" <fred@cisco.com>, Randy Bush <randy@psg.com>
In-Reply-To: <8C48B86A895913448548E6D15DA7553B9268E3@xmb-rcd-x09.cisco.com>
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Cc: IPv6 Deployment Prevention <ipv6@ietf.org>
X-BeenThere: ipv6@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
Reply-To: Mark ZZZ Smith <markzzzsmith@yahoo.com.au>
List-Id: "IPv6 Maintenance Working Group \(6man\)" <ipv6.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/ipv6>, <mailto:ipv6-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/ipv6>
List-Post: <mailto:ipv6@ietf.org>
List-Help: <mailto:ipv6-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/ipv6>, <mailto:ipv6-request@ietf.org?subject=subscribe>
X-List-Received-Date: Wed, 26 Jun 2013 10:56:54 -0000




----- Original Message -----
> From: Fred Baker (fred) <fred@cisco.com>
> To: Randy Bush <randy@psg.com>
> Cc: IPv6 Deployment Prevention <ipv6@ietf.org>
> Sent: Wednesday, 26 June 2013 1:30 PM
> Subject: Re: New Version	Notification	for
	draft-bonica-6man-frag-deprecate-00.txt
> 
> 
> On Jun 25, 2013, at 12:42 PM, Randy Bush <randy@psg.com> wrote:
> 
>>  in reality, you can not count on pmtud working
> 
> One of these days, I'll understand why Linux/FreeBSD/Windows/Apple don't 
> implement RFC 4821. 

Actually, Linux does, it just needs to be switched on in /proc/sys/net/ipv4/
tcp_mtu_probing - INTEGER Controls TCP Packetization-Layer Path MTU Discovery.  Takes three values: 0 - Disabled 1 - Disabled by default, enabled when an ICMP black hole detected 2 - Always enabled, use initial MSS of tcp_base_mss.
I think Windows also implements something similar:
"
Troubleshooting PMTU Black Hole Routers"
http://technet.microsoft.com/en-us/library/cc958871.aspx



One of the issues with conventional ICMP PTB based PMTUD is the default rate limits on ICMP messages on broadband routers with PPPoE subscribers i.e. dumbell [1500][1492][1500] MTUs, slowing down PMTUD. Upping the limit on ICMP PTBs is an obscure parameter to have to remember to change, and it isn't clear exactly what to change it to - IIRC, the value I've used in the past is 1000/s up from 10/s. RFC4821 would be nice because it would avoid control plane processing that ICMP based PMTUD causes.

Regards,
Mark.

v2.23.0 | Report a Bug | By Email