From nobody Sat Oct 23 02:16:09 2021 Return-Path: X-Original-To: tls@ietfa.amsl.com Delivered-To: tls@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 805723A08EB for ; Sat, 23 Oct 2021 02:16:06 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.498 X-Spam-Level: X-Spam-Status: No, score=-1.498 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, KHOP_HELO_FCRDNS=0.399, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=no autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id q-gSvneRk_Ve for ; Sat, 23 Oct 2021 02:16:04 -0700 (PDT) Received: from welho-filter2.welho.com (welho-filter2b.welho.com [83.102.41.28]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 050513A08E7 for ; Sat, 23 Oct 2021 02:16:03 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by welho-filter2.welho.com (Postfix) with ESMTP id 1E409D01F9 for ; Sat, 23 Oct 2021 12:16:01 +0300 (EEST) X-Virus-Scanned: Debian amavisd-new at pp.htv.fi Received: from welho-smtp1.welho.com ([IPv6:::ffff:83.102.41.84]) by localhost (welho-filter2.welho.com [::ffff:83.102.41.24]) (amavisd-new, port 10024) with ESMTP id yrnaztI0T-zQ for ; Sat, 23 Oct 2021 12:16:00 +0300 (EEST) Received: from LK-Perkele-VII2 (87-92-216-160.rev.dnainternet.fi [87.92.216.160]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by welho-smtp1.welho.com (Postfix) with ESMTPSA id E99017A for ; Sat, 23 Oct 2021 12:15:59 +0300 (EEST) Date: Sat, 23 Oct 2021 12:15:59 +0300 From: Ilari Liusvaara To: IETF TLS Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: Sender: ilariliusvaara@welho.com Archived-At: Subject: Re: [TLS] TLS Flags and IANA registration policy X-BeenThere: tls@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "This is the mailing list for the Transport Layer Security working group of the IETF." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Oct 2021 09:16:07 -0000 On Sat, Oct 23, 2021 at 08:46:56AM +0000, Hannes Tschofenig wrote: > Hi all, > > https://datatracker.ietf.org/doc/html/draft-ietf-tls-tlsflags gives > guidance on registering values in the TLS Flags namespace. > > One of the field is the "Recommended" field and it is described as > follows: > > " > o Recommended, which is a Y/N value determined in the document > defining the optional feature. > " > > What does this mean? When do I use a "Y" and when a "N"? What is the > implication of declaring it as a "N"? I would presume it is the same as for extensions, which is described in registry note as: "If an item is not marked as 'Recommended', it does not necessarily mean that it is flawed; rather, it indicates that the item either has not been through the IETF consensus process, has limited applicability, or is intended only for specific use cases." -Ilari