Re: [Ntp] Danny's Review (was Re: draft-ietf-ntp-roughtime-05: tag change makes implementation more complex)

"Salz, Rich" <rsalz@akamai.com> Tue, 28 September 2021 23:13 UTC

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From: "Salz, Rich" <rsalz@akamai.com>
To: Danny Mayer <mayer@pdmconsulting.net>, JP Sugarbroad <taralx@gmail.com>
CC: Watson Ladd <watsonbladd@gmail.com>, NTP WG <ntp@ietf.org>, "Marcus Dansarie" <marcus@dansarie.se>
Thread-Topic: [Ntp] Danny's Review (was Re: draft-ietf-ntp-roughtime-05: tag change makes implementation more complex)
Thread-Index: AQHXtAsFAzIxA/3amUyAh8LAi9D9yKu52ieAgAAPwQCAADhTAP//8n8A
Date: Tue, 28 Sep 2021 23:13:13 +0000
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References: <CAGZkp1-ZCuSvMyQyWCnE511O8-WL=OXfsTdraKsByMmWC3spVA@mail.gmail.com> <CACsn0ckZmR=k2NAmdyhVOA=V_XQ18AnBUBSTOu+bDXS1YsPpUg@mail.gmail.com> <CAGZkp18eASaF7qvubYpDgzvg643ZXuPwDs9qsiC1P_AVLcywLA@mail.gmail.com> <CACsn0cnjHFwxHT13nMavRFzRteWJ=SORY8v4RCZjdjYP0H3oaw@mail.gmail.com> <7dde7eb3-4dc7-94d3-e63a-6d5d0736b1c2@pdmconsulting.net> <54baf1fa-b138-4eb8-6f4e-99168cf2db7b@dansarie.se> <0a95d35f-f708-4a3c-4ecf-77597c42a7a4@pdmconsulting.net> <CACsn0c=gdQWDumfzeHYYWzXPV4sz4J9mTUtYW+4=KueaHHbGdQ@mail.gmail.com> <79dfd56c-54e8-8b85-ed9d-da9fac71d1f1@pdmconsulting.net> <c95eaafb-f294-a54e-d495-0cf74e574686@pdmconsulting.net> <CACsn0cmks2fdwem1rS+QNzCL1WhNR4890Fi1zpjQrL=E3Y=3fQ@mail.gmail.com> <684af837-0713-9293-168b-8b140bf15d22@pdmconsulting.net> <CAGZkp183CgJJOd5O5dDdeKtAzgCobwBzpZe3ixBWJ-ZLQXB6bg@mail.gmail.com> <edee8b51-47b4-3a33-436e-b235fdcf6b99@pdmconsulting.net>
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Subject: Re: [Ntp] Danny's Review (was Re: draft-ietf-ntp-roughtime-05: tag change makes implementation more complex)
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> There is nothing to prevent me creating a protocol called SMOOTHTIME and throwing the ROUGHTIM value in the header to fool you. How has that made the protocol unambiguous?

And what will happen?  Your protocol will be treated by conformant applications as ROUGHTIM.  Is that what SMOOTHTIM is?

The IETF tries not to have conflicting identifiers, and sometimes IANA is involved.

A protocol header might help here, and seems to cause no harm.