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

Mark Andrews <marka@isc.org> Wed, 26 June 2013 00:07 UTC

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To: Brian E Carpenter <brian.e.carpenter@gmail.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> <3B0D9447-D39F-4165-9B43-019C3513101A@employees.org> <m2ip12j6d9.wl%randy@psg.com> <A0662700-628E-4032-89ED-6621B0867820@apple.com> <m2zjudixlt.wl%randy@psg.com> <51CA2E75.7050204@gmail.com>
Subject: Re: New Version Notification for draft-bonica-6man-frag-deprecate-00.txt
In-reply-to: Your message of "Wed, 26 Jun 2013 11:57:41 +1200." <51CA2E75.7050204@gmail.com>
Date: Wed, 26 Jun 2013 10:06:45 +1000
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In message <51CA2E75.7050204@gmail.com>, Brian E Carpenter writes:
> On 26/06/2013 11:23, Randy Bush wrote:
> ...
> 
> > ron is actually deploying ipv6 in enterprises to see what his customers
> > are seeing, eating his own dogfood.  he did not field this draft for his
> > amusement or to get his name on an rfc.
> 
> The only times I've seen hard FAILs with apparently operational IPv6
> sites were caused by MTU mismatch and TCP MSS negotiation failure,
> followed by silence which I assumed was due to fragmented packets
> being discarded. Yes, this is a real problem and doing nothing
> certainly isn't an option. We just need to be sure that the cure
> isn't worse than the illness.

Named uses IPV6_USE_MIN_MTU=1 to avoid this.  It should affect MSS
negotiation but MacOS and FreeBSD are broken (bug fix submitted for
FreeBSD).

Mark 

>    Brian
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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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