Hannes,

Sorry I forgot to answer this, but John pretty much answered it for me. The 
prevailing notion that the WG has been under is that extensions defined are for 
TLS 1.3. We put the following in the charter to make that clear:

   Changes or additions to older versions of (D)TLS whether
   via extensions or ciphersuites are discouraged and require
   significant justification to be taken on as work items.

So ... do you have a significant justification?

Cheers,
spt

> On Nov 4, 2021, at 09:11, John Mattsson 
> <john.mattsson=40ericsson....@dmarc.ietf.org> wrote:
> 
> TLS 1.2 has been obsolete for over three years. Oxford dictionary defines 
> obsolete as "no longer produced or used; out of date." NIST requires support 
> of TLS 1.3 everywhere no later than Jan 2024, which at least in theory means 
> no negotiation of TLS 1.2.
>  
> I think IETF, TLS WG, and TLS libraries should spend their time on TLS 1.3 
> rather than giving the false idea it is ok to stay on TLS 1.2.
>  
> John
>  
> From: TLS <tls-boun...@ietf.org> on behalf of Hannes Tschofenig 
> <hannes.tschofe...@arm.com>
> Date: Monday, 25 October 2021 at 19:12
> To: IETF TLS <tls@ietf.org>
> Subject: [TLS] Flags Extension: why only for TLS 1.3?
> 
> Hi all, 
>  
> why is the flags extension only defined for TLS 1.3?
>  
> There is nothing in this extension that prevents us from using it also in TLS 
> 1.2.
>  
> Could we make it also available to TLS 1.2?
>  
> Ciao
> Hannes
>  
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