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Re: [tsvwg] DTLS 1.3 over SCTP

Claudio Porfiri <claudio.porfiri@ericsson.com> Fri, 14 July 2023 09:24 UTC

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From: Claudio Porfiri <claudio.porfiri@ericsson.com>
To: Michael Tuexen <michael.tuexen@lurchi.franken.de>
CC: tsvwg IETF list <tsvwg@ietf.org>
Thread-Topic: [tsvwg] DTLS 1.3 over SCTP
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Date: Fri, 14 Jul 2023 09:24:45 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/tsvwg/oqtc9IYqRJj1327KCYxkZuB-od8>
Subject: Re: [tsvwg] DTLS 1.3 over SCTP
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Hi Michael,
As an example, S1-AP protocol that exploits SCTP and is described in TS 36.413 (the protocol) and TS 36.412 (the transport) can send a single message that contains all the features from a User Equipment and the total maximum size of this signal may grow up to 142k.
S1-AP is not the most demanding though, there are signals in Xn protocol specified in TS 48.423 that can grow up to more than 500k

BR,
Claudio.

-----Original Message-----
From: Michael Tuexen <michael.tuexen@lurchi.franken.de> 
Sent: Friday, 14 July 2023 11:14
To: Claudio Porfiri <claudio.porfiri@ericsson.com>
Cc: tsvwg IETF list <tsvwg@ietf.org>
Subject: Re: [tsvwg] DTLS 1.3 over SCTP

> On 14. Jul 2023, at 08:04, Claudio Porfiri <claudio.porfiri=40ericsson.com@dmarc.ietf.org> wrote:
> 
> Hi Michael,
> I am reading this new draft but I have a quick comment at once.
> The requirements from 3GPP towards SCTP are far beyond the limit of 64k, for instance S1-AP needs up to 142k.
Hi Claudio,

could you provide some insight what kind of signalling message needs up to 142KB?
Just wondering what kind of information needs 142 KB.
> This new draft improves the situation but doesn't solve it.
The focus is not limited to 3GPP. We are trying to improve the situation
for RFC 6083 with minimizing the changes.

Best regards
Michael
> 
> Best regards,
> Claudio
> 
> -----Original Message-----
> From: tsvwg <tsvwg-bounces@ietf.org> On Behalf Of Michael Tuexen
> Sent: Thursday, 13 July 2023 16:35
> To: tsvwg IETF list <tsvwg@ietf.org>
> Subject: [tsvwg] DTLS 1.3 over SCTP
> 
> Dear all,
> 
> Hannes Tschofenig and myself have submitted an ID for using DTLS 1.3 over SCTP:
> https://www.ietf.org/archive/id/draft-tuexen-tsvwg-rfc6083-bis-02.html
> 
> This is an alternative to
> https://www.ietf.org/archive/id/draft-ietf-tsvwg-dtls-over-sctp-bis-06.html
> 
> Our document is based on RFC 6083. The major differences are:
> * Use DTLS 1.3 instead of DTLS 1.0
> * Use key updates instead of renegotiation. This limits the number of
>  rekeyings to 2^64, but that should not limit in real world scenarios.
> * Bump the maximum user message size to 64KB by using RFC 8449.
> 
> Any comments welcome.
> 
> Best regards
> Michael

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