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

Mark Andrews <marka@isc.org> Thu, 27 June 2013 01:04 UTC

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To: james woodyatt <jhw@apple.com>
From: Mark Andrews <marka@isc.org>
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> <3AE1B933-97B8-4312-8829-BC02AB6666CC@apple.com>
Subject: Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
In-reply-to: Your message of "Wed, 26 Jun 2013 17:39:27 -0700." <3AE1B933-97B8-4312-8829-BC02AB6666CC@apple.com>
Date: Thu, 27 Jun 2013 11:04:24 +1000
Message-Id: <20130627010424.EFBA03653CEC@drugs.dv.isc.org>
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In message <3AE1B933-97B8-4312-8829-BC02AB6666CC@apple.com>, james woodyatt writes:
> On Jun 25, 2013, at 20:30 , Fred Baker (fred) <fred@cisco.com> wrote:
> > On Jun 25, 2013, at 12:42 PM, Randy Bush <randy@psg.com> wrote:
> >> 
> >> in reality, you can not count on pmtud working
> 
> In reality, you can not count on the Internet working.  Despite that, it mostly works, most everywhere you need it to wor
> k, most of the time.  Only occasionally, does one encounter failure.
> 
> > One of these days, I'll understand why Linux/FreeBSD/Windows/Apple don't implement RFC 4821. 
> 
> One of these days, I'll understand why operators don't make it MANDATORY for all hosts on their networks to implement RFC
>  4821 before they configure their routers to break ICMPv6 path MTU discovery.

I don't know why firewall vendors permit configurations that block
icmpv6 PTB while passing ipv6 packets bigger than 1280 over the same
interface.  Such a configuration is broken.

If you don't want to let icmpv6 PTB in then set the MTU to 1280 and
generate icmpv6 PTB for anything bigger than 1280 yourself.

> --
> james woodyatt <jhw@apple.com>
> core os networking
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org

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