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

John Mattsson <john.mattsson@ericsson.com> Sat, 21 January 2023 10:13 UTC

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From: John Mattsson <john.mattsson@ericsson.com>
To: "core@ietf.org" <core@ietf.org>
Thread-Topic: Typical TCP segment header size for CoAP over TCP
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Date: Sat, 21 Jan 2023 10:13:11 +0000
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Subject: [core] Typical TCP segment header size for CoAP over TCP
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Hi,

At the TLS WG list, Achim Kraus commented that

https://datatracker.ietf.org/doc/draft-ietf-lwig-security-protocol-comparison/

should mention the size differences between the UDP datagram header and 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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