Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile

Christian Huitema <huitema@huitema.net> Thu, 30 August 2018 06:20 UTC

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To: Joe Touch <touch@strayalpha.com>, Tom Herbert <tom@herbertland.com>
Cc: Toerless Eckert <tte@cs.fau.de>, int-area <int-area@ietf.org>, intarea-chairs@ietf.org
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From: Christian Huitema <huitema@huitema.net>
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Date: Wed, 29 Aug 2018 23:19:30 -0700
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Subject: Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile
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On 8/29/2018 7:58 PM, Joe Touch wrote:
>
>
> On 2018-08-29 18:34, Tom Herbert wrote:
>
>>
>> Joe,
>>
>> End hosts are already quite capable of dealing with reassembly,
>  
> Regardless, middleboxes shouldn't be avoiding their own effort by
> creating work for others. A corollary to the Postal Principle should
> be "you make the mess, you clean it up". 

Joe's stubborn adherence to the letter of the RFC would be very nice if
the protocol police could somehow punish the merchants of NATs... The
whole discussion reminds me of Martin Thomson's draft, "use it or lose
it" (draft-thomson-use-it-or-lose-it-02). Martin is describing how
extension mechanisms that are not actually used get ossified away by the
deployment of middle-boxes. The same happened long ago with IP
segmentation. With NATs, applications cannot assume that reassembly will
work. With Firewalls, transports cannot assume that ICMP will work.

-- Christian Huitema