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

Joe Touch <touch@strayalpha.com> Thu, 02 August 2018 14:38 UTC

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From: Joe Touch <touch@strayalpha.com>
In-Reply-To: <D1D5EDCE-7C43-4CD8-947C-AA43CDB18892@employees.org>
Date: Thu, 2 Aug 2018 07:38:00 -0700
Cc: Tom Herbert <tom@herbertland.com>, int-area <int-area@ietf.org>, intarea-chairs@ietf.org
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To: Ole Troan <otroan@employees.org>
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Subject: Re: [Int-area] WG Adoption Call: IP Fragmentation Considered Fragile
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I am not ignoring them; I’m claiming that they all have the same inherent deployment and implementation limitations.

Just because operators/vendors “want” to do otherwise does not make it possible.

Joe

> On Aug 1, 2018, at 8:22 AM, Ole Troan <otroan@employees.org> wrote:
> 
> But only if you continue to ignore that there are other IPv4 sharing mechanisms than NAT. 
> 
> Ole
> 
>> On 1 Aug 2018, at 16:11, Joe Touch <touch@strayalpha.com> wrote:
>> 
>> We all understand that many current NAT devices and their deployments are not compatible with IP fragmentation (v4 or v6).
>> 
>> That leaves us with two options:
>>   1. change IP, but that leaves us with problems for which we have no solution (encrypted payloads, other DPI devices that look further in, etc.)
>>   2. change NATs and how they’re deployed (to require reassembly or its equivalent before processing, to not be deployed except where they can act as the host they proxy for)
>> 
>> Both cost money and will have an impact.
>> 
>> #2 involves changing less devices AND has the benefit that we know it will work.
>> 
>> I see no good reason to continue to try #1 in the meantime.
>> 
>> Joe
>