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

Joe Touch <touch@strayalpha.com> Fri, 03 August 2018 14:18 UTC

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From: Joe Touch <touch@strayalpha.com>
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Date: Fri, 3 Aug 2018 07:18:19 -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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> On Aug 3, 2018, at 2:54 AM, Ole Troan <otroan@employees.org> wrote:
> 
> Joe,
> 
>>>> It also looks like (at first glance at least) these devices work only when there isn't multipath between the back and front side.
>>> 
>>> The A+P routers are stateless and do support multipath. Including traffic does not need to be symmetric.
>>> That’s the main selling point for A+P, that you don’t need per flow state in the core of the network.
>> 
>> The +P part doesn’t seem like it’s compatible with fragmentation, though - yet it doesn’t update RFC791 to deprecate it throughout the Internet.
> 
> It’s not incompatible with fragmentation. Just that there are some pitfalls. As explained in rfc7597. 

A flawed solution is not reason to break the rest of the Internet by deprecating fragmentation.

> ...If you can solve this problem in a better way please go ahead. 

I don’t have to, nor do I care to. But it isn’t productive to break another part of the Internet in the search for a solution to this problem.

Joe