Re: [core] RFC7252 - PROBING_RATE

Achim Kraus <achimkraus@gmx.net> Mon, 05 July 2021 07:46 UTC

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To: Carsten Bormann <cabo@tzi.org>
Cc: "core@ietf.org" <core@ietf.org>
References: <6e7a8ec1-121c-03ae-8e4a-f615e5b4d83a@gmx.net> <DABF494F-E9EE-40CC-8995-E4248B420E30@tzi.org>
From: Achim Kraus <achimkraus@gmx.net>
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Date: Mon, 5 Jul 2021 09:46:18 +0200
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Subject: Re: [core] RFC7252 - PROBING_RATE
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Hi Carsten,

Thanks for your answer!

best regards
Achim

Am 04.07.21 um 13:31 schrieb Carsten Bormann:
> On 4. Jul 2021, at 12:08, Achim Kraus <achimkraus@gmx.net> wrote:
>>
>> With both, sending a CON request, e.g. about 20 bytes, and receiving no
>> message back for the ACK_TIMEOUT, sending again 20 byte short after
>> these 2s seems to violate the PROBING_RATE.
>
> Outside millibit networks, any packet instantaneously exceeds the default value of PROBING_RATE.
> So this is indeed meant as an average value over time — an application should not send a sustained rate of more than about 1 B/s to a peer endpoint that might not be reachable (“into thin air”).
>
>> Or may consider, a special
>> definition of "average data rate". Assuming, that a "normal CON
>> transfer" will then take 62 and sends the 20 bytes 5 times results in
>> 1,6 bytes/second.
>
> Indeed, the value chosen for the default PROBING_RATE was oriented after the average rate in which CON retries are sent.
>
> Grüße, Carsten
>