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Re: [tcpm] RFC793bis draft 14 Reserved Bits

Bob Briscoe <in@bobbriscoe.net> Wed, 11 December 2019 18:12 UTC

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To: Wesley Eddy <wes@mti-systems.com>
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References: <201911280244.xAS2iX3T010083@gndrsh.dnsmgr.net> <991312DB-9503-4253-8C87-3CBCA6AB99F1@strayalpha.com> <77bade9d-f090-9ec7-cc7a-29e4118321ad@mti-systems.com>
From: Bob Briscoe <in@bobbriscoe.net>
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Date: Wed, 11 Dec 2019 18:12:30 +0000
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Subject: Re: [tcpm] RFC793bis draft 14 Reserved Bits
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Wes,

On 04/12/2019 14:59, Wesley Eddy wrote:
>> Perhaps further explicitly:
>>
>> they MUST be ignored by the network and MUST traverse the network 
>> unchanged
>
>
> This clarification seems good to me, and it looks like everyone who's 
> chimed in so far agrees, so I can put it into the upcoming revision.

I think it's important to make this a requirement for middleboxes as 
well as just 'the network'. Where I would define middlebox as a function 
acting on L4 (TCP) fields without being a full implementation of TCP.

I know some middlebox developers will ignore it. But their customers 
(operators) cannot require middleboxes to comply with IETF spec's if we 
don't write what middleboxes should do in our specs.

You might find some of the text in the AccECN spec on middlebox 
requirements useful (and pls send comments if it could be improved):
https://tools.ietf.org/html/draft-ietf-tcpm-accurate-ecn-09#section-3.3



Bob

-- 
________________________________________________________________
Bob Briscoe                               http://bobbriscoe.net/

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