From nobody Mon Dec 27 08:47:15 2021 Return-Path: X-Original-To: tcpm@ietfa.amsl.com Delivered-To: tcpm@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 7603D3A08A0 for ; Sun, 26 Dec 2021 23:34:22 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.097 X-Spam-Level: X-Spam-Status: No, score=-2.097 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=gmail.com 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 Smho6-nsx2Ka for ; Sun, 26 Dec 2021 23:34:17 -0800 (PST) Received: from mail-pf1-x435.google.com (mail-pf1-x435.google.com [IPv6:2607:f8b0:4864:20::435]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id D80B23A089F for ; Sun, 26 Dec 2021 23:34:17 -0800 (PST) Received: by mail-pf1-x435.google.com with SMTP id m1so13030331pfk.8 for ; Sun, 26 Dec 2021 23:34:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=7Ds6HkZW5uEymIo6ftmLqcZ3NQOzydxbarm/4W1h6s0=; b=EafdONUFad+tH0YRDzh4T+NptH9bger84vbt7RE+VmoZrE74mIBN1T1C4oL0SGIpHK TDMFXGmVoKY6Q2v1G7oDNOy65gRKqX0ealQfKQXuVh9qth9AUipzD5hkMSXAHDd+yFzv y/Z+UJg+DofwiauuXKouvvhgMzOMypV8lgttzWtUF+y9DWUjTUEd3dN8Q7i7iL1c+P3P cCsZhymBTF+FAg2l3QjN5niIdxUcAcm3hmtUrYcTsqtz9N5alTIy+hel/x9+JsQTQa7f HuwG2k9V+D0JeMcyaeKhJ+xVmEMs1SlKfoTwIcc8h2XAkNCGQpG+M4qAv3IPIzhsYZ54 3+bg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=7Ds6HkZW5uEymIo6ftmLqcZ3NQOzydxbarm/4W1h6s0=; b=jSV3P9tXoitxW7zxhGTm6egHTFOVO+N3AK+pg+6U6WVCWO98LFy2vgC79RhJVTSLA+ ZGZSiz6u2vyWm4fhKBtYwnE5dENKmoPBuCN9PNUeDkNtcYv7cHXs2R550a1I0NCRM9RU nOMBT39zhMK0xhkgu8k0VTUG5lPX5u8+eDl2BaAGQAi4KXEqH1bNUuFNLGOZ66XIYckL LhGJXDrFQWIgTcE9jI4a7/lJMm1l837Ih2CHyiWNqObtyj1X2s6frH4NGwYmJ+yS+VW9 Czqz2oVn8BJpOR52gfWB15ztCVP33lb9aMBRIT5xHmGjy/CWasiESY7PnoXLquoezdh0 2e9A== X-Gm-Message-State: AOAM531zpa+bnOUQSDg9/WuFMR9M3n82oGyQY7jm10OBK5Dn0aD4FDU+ MHCoJbYtcg8KaQtUEXqqgTldU7eboMQeEiBtAoU= X-Google-Smtp-Source: ABdhPJzPiELOVM7jcQDjDhMj2eeZzCyn/znas0RYJ7DAa2XcHGUNCk9ok9egrhB0xEadcYlSQ/hFPqiGCK6thVfnZ+U= X-Received: by 2002:a63:920b:: with SMTP id o11mr14990042pgd.314.1640590456179; Sun, 26 Dec 2021 23:34:16 -0800 (PST) MIME-Version: 1.0 References: <20211226085938.97471F0F1F@rfc-editor.org> <61C84CAD.8040300@btconnect.com> <5152DC2D-1E40-4011-94D7-EE7CBB851C6E@tzi.org> <6DDBA952-F80F-4A40-B387-7CB975FA0AC2@tzi.org> In-Reply-To: <6DDBA952-F80F-4A40-B387-7CB975FA0AC2@tzi.org> From: Yaakov Stein Date: Mon, 27 Dec 2021 09:34:06 +0200 Message-ID: To: Carsten Bormann Cc: t petch , RFC Errata System , rs@netapp.com, tcpm@ietf.org, braden@isi.edu, Van Jacobson , david.borman@quantum.com Content-Type: multipart/alternative; boundary="0000000000005cd5ba05d41bbb43" Archived-At: X-Mailman-Approved-At: Mon, 27 Dec 2021 08:47:07 -0800 Subject: Re: [tcpm] [Editorial Errata Reported] RFC7323 (6798) X-BeenThere: tcpm@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: TCP Maintenance and Minor Extensions Working Group List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 27 Dec 2021 07:34:23 -0000 --0000000000005cd5ba05d41bbb43 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable None of the three cases I called out will cause interop problems, but they open potential security or privacy issues. But the lack of interop concerns did not dictate capitalization in other cases, such as A TSecr value received in a segment MAY be used to update the averaged RTT measurement which is a purely local matter. Y(J)S On Mon, Dec 27, 2021 at 8:08 AM Carsten Bormann wrote: > > On 2021-12-27, at 06:16, Yaakov Stein wrote: > > > > In any case, the same RFC uses the normative "MAY" in several other > places, > > so these are probably mistakes. > > > > For example, > > The three-byte Window Scale option MAY be sent in a segment by = a > TCP. > > and > > This option MAY be sent in an initial segment. > > > > So why > > A random offset may be added to the timestamp clock on a > per-connection basis. > > ? > > Is this may to be considered weaker than the other two? > > Is this an interoperability =E2=80=9CMAY=E2=80=9D, i.e., does the peer ne= ed to be prepared > for this behavior? The other two clearly are, while this seems like loca= l > matter. > > Gr=C3=BC=C3=9Fe, Carsten > > > --0000000000005cd5ba05d41bbb43 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
None of the three cases I called out will= cause interop problems, but they open potential security or privacy issues= .

But the lack of interop concerns did not dictate capit= alization=C2=A0in other cases, such as=C2=A0
  A TSec=
r value received in a segment MAY be used to update
  the averaged RTT measurement 
whi=
ch is a purely local matter.

Y(J)S

On Mon, Dec 27, 2021 at 8:08 AM Carsten Borm= ann <cabo@tzi.org> wrote:
> On 2021-12-27, at = 06:16, Yaakov Stein <yaakovjstein@gmail.com> wrote:
>
> In any case, the same RFC uses the normative "MAY" in severa= l other places,
> so these are probably mistakes.
>
> For example,
>=C2=A0 =C2=A0The three-byte Window Scale option MAY be sent in a <SY= N> segment by a TCP.
> and
>=C2=A0 =C2=A0This option MAY be sent in an initial <SYN> segment.=
>=C2=A0
> So why
>=C2=A0 =C2=A0A random offset may be added to the timestamp clock on a p= er-connection basis.
> ?
> Is this may to be considered weaker than the other two?

Is this an interoperability =E2=80=9CMAY=E2=80=9D, i.e., does the peer need= to be prepared for this behavior?=C2=A0 The other two clearly are, while t= his seems like local matter.

Gr=C3=BC=C3=9Fe, Carsten


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