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Re: [core] Typical TCP segment header size for CoAP over TCP

Achim Kraus <achimkraus@gmx.net> Sat, 21 January 2023 14:44 UTC

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Date: Sat, 21 Jan 2023 15:44:06 +0100
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To: John Mattsson <john.mattsson=40ericsson.com@dmarc.ietf.org>, "core@ietf.org" <core@ietf.org>
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From: Achim Kraus <achimkraus@gmx.net>
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Subject: Re: [core] Typical TCP segment header size for CoAP over TCP
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Hi John,

 > Achim suggested 24 bytes.

My failure, I counted the line with "Options | padding" which is optional.

So 20 bytes.

best regards
Achim

Am 21.01.23 um 11:13 schrieb John Mattsson:
> Hi,
>
> At the TLS WG list, Achim Kraus commented that
>
> https://datatracker.ietf.org/doc/draft-ietf-lwig-security-protocol-comparison/ <https://datatracker.ietf.org/doc/draft-ietf-lwig-security-protocol-comparison/>
>
> should mention the size differences between the UDP datagram headerand
> the TCP segment header. This is a very good idea that we will do in the
> next version. While the UDP header is 8 bytes, the TCP header is
> variable length (20-60 bytes). Achim suggested 24 bytes. Is that the
> typical value that other people are using as well or are there other
> sizes in use for CoAP over TCP? I assume that RFC 9001 might be a good
> reference.
>
> Cheers,
> John
>
>
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