Re: [tsvwg] transport-encrypt-14 review, pt 1

Joseph Touch <touch@strayalpha.com> Thu, 09 April 2020 20:20 UTC

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From: Joseph Touch <touch@strayalpha.com>
In-Reply-To: <CAM4esxTbVSX1voJjzyt3YdapPuv7+K4EpU35SWYC3Y0rmo7Tww@mail.gmail.com>
Date: Thu, 9 Apr 2020 13:20:26 -0700
Cc: draft-ietf-tsvwg-transport-encrypt.all@ietf.org, tsvwg <tsvwg@ietf.org>
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To: Martin Duke <martin.h.duke@gmail.com>
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Subject: Re: [tsvwg] transport-encrypt-14 review, pt 1
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> On Apr 9, 2020, at 12:44 PM, Martin Duke <martin.h.duke@gmail.com> wrote:
> 
> - Conversely, middlebox interference with headers does enable performance enhancing proxies for extraordinary link types like satellite.

Those are only “extraordinary” only in the “been around for 50 years in the Arpanet/Internet”. That understanding goes back as far as RFC 346 and IEN 8.

Additionally, ground nets often experience similar BW delay products, which can be the dominant driver. 

There are known ways to help TCP over such links that don’t involve these sort of steps, documented as far back as RFC 2488, some of which are now being incorporated (faster window growth and recovery, ala Hybla).

I.e., just because a mechanism CAN rely on these headers doesn’t mean that’s the only - or even safe - way to do so.

Joe