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mail-out.ntp.dev; none Received: from mail.develooper.com (10-41-3-5.mailserver-rspamd.mailserver.svc.cluster.local [10.41.3.5]) by mail-out.ntp.dev (Postfix) with ESMTP id 722A19F; Wed, 22 Jul 2026 12:24:03 +0000 (UTC) Content-Type: text/plain; charset=us-ascii MIME-Version: 1.0 From: =?utf-8?Q?Ask_Bj=C3=B8rn_Hansen?= In-Reply-To: <93dd7fbc-294b-4ab1-bea6-e6fa9ba20f1f@pdmconsulting.net> Date: Wed, 22 Jul 2026 14:23:48 +0200 Content-Transfer-Encoding: quoted-printable X-MS-Reactions: disallow Message-Id: <5674BDFE-772A-402D-93D3-7C27DC14230B@develooper.com> References: <20260720113007.9E45662003D@107-137-68-211.lightspeed.sntcca.sbcglobal.net> <81B0134C-1619-4765-BA21-B81DAD0D918D@gmail.com> <93dd7fbc-294b-4ab1-bea6-e6fa9ba20f1f@pdmconsulting.net> To: Danny Mayer Message-ID-Hash: DGJMNBMEYTEKDLXOCDVSQFD7LJ5JMOE7 X-Message-ID-Hash: DGJMNBMEYTEKDLXOCDVSQFD7LJ5JMOE7 X-MailFrom: ask@develooper.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-ntp.ietf.org-0; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Sarah Grant , Miroslav Lichvar , Hal Murray , ntp@ietf.org X-Mailman-Version: 3.3.9rc6 Precedence: list Subject: =?utf-8?q?=5BNtp=5D_Re=3A_NTPv5=3A_Operational_use_case_for_server/node_iden?= =?utf-8?q?tification?= List-Id: Network Time Protocol Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: > On Jul 21, 2026, at 02:39, Danny Mayer = wrote: >=20 > The Extension Field contains the EF Id and the length of the extension = field in bytes. The body of the extension field can be of any length but = it is reasonable to limit the length of this one to something like 8 = bytes or similar. 8 bytes is tight, that's only twice the refid. 255 bytes seems unnecessarily wasteful and would either invite = amplification or need some complicated semantics for communicating = truncation. I'd go with something between 32 and 64 bytes. Either one holds what an = operator will realistically use: an opaque identifier[1] or a name for = the site and node. With 48 or 64 you can have both. I'd also make it a fixed size field, zero padded, carried at the same = size in the request. Request and response are then always the same size, = so there's no amplification to argue about, nothing to truncate, and no = length byte. Both sizes are a multiple of 4 with the header, so the = NTPv4 restrictions are fine too. On whether "a Unicode string" is well defined: say UTF-8. NSID is opaque = octets, which is why RFC 5001 makes user interfaces print it as hex even = though operators put readable ASCII in there. Ask [1] a 128 bit identifier can fit as hex, base32, base58, depending on = how much space you want for something else.=