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Mon, 20 Jul 2026 17:40:07 -0700 (PDT) Received: from [IPV6:2600:4040:579b:1800:84e5:28bf:ab03:38a4] (unknown [IPv6:2600:4040:579b:1800:84e5:28bf:ab03:38a4]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by tom.everett.org (Postfix) with ESMTPSA id 67A112C6AE; Mon, 20 Jul 2026 17:39:57 -0700 (PDT) Message-ID: <93dd7fbc-294b-4ab1-bea6-e6fa9ba20f1f@pdmconsulting.net> Date: Mon, 20 Jul 2026 20:39:53 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird To: Sarah Grant , Miroslav Lichvar References: <20260720113007.9E45662003D@107-137-68-211.lightspeed.sntcca.sbcglobal.net> <81B0134C-1619-4765-BA21-B81DAD0D918D@gmail.com> Content-Language: en-US From: Danny Mayer Autocrypt: addr=mayer@pdmconsulting.net; keydata= xsFNBGRtgYUBEADKHtgchclbvG8qGinRkjaQMzqxua/+aLsvDQpLGA/mEglc+LGPOWEyDiBV tm8KtiSBSUfsdt76DNZAyVgAT6WUr3JuFhy7yOHa5KxHVtbv44L/iVZni+Ox56NFjuD4Qbsx pdi0R0Efyeb7FJMXkqwOQneMVtjyYdD5mwdvocouNAjBerpezV7xK/P6x52oz6pQsA7J8eYB dIOrVayWbSU2rBQqjOdt/Pw7pg69dRVaa0Redwdj58fDku4EDg5f+4VXJILJIIEfdwvMcJEi wik3xFmKCFHJDSGjpy629QXBlvGibk8QdYjn38eN4ig7gLDbdm7mbuAq+LHn9OUjQfjsX/lk 8xB4HS05u1yJqCP55gh8jjB9/2YIzu13jI6eGWmDiL3mMsm7EMjeRcGzLeRGc7Z46/jiGEqp I4i9tFAKvTbePOntAc1qtfZaNCbBJ1lMg5nH3FI8y5T14kxqxMFtwyXJgDJ4nUTMPx/yvqVm PDe6fcPlWpaxnYRuIiQEGOFhorJh95kL73VC3s017FHxgd39ChltemBTpcqMmrNMYUx3mNhM FFylX8i4/DoyXavjRhazWCH6Dl5g/7hU711ogMnK0KtqnDPv1tC0bUoFqI5sIMBF4yWbVic+ GJbOei/AodRlMNlLmWANAunNEpeYFWQcSu4blYapUzYF+DkQfwARAQABzSVEYW5ueSBNYXll ciA8bWF5ZXJAcGRtY29uc3VsdGluZy5uZXQ+wsGUBBMBCAA+FiEE+T1SGuvUaVA42aYxfvsc Rm+sdQ8FAmRtgYUCGwMFCQeGHyEFCwkIBwIGFQoJCAsCBBYCAwECHgECF4AACgkQfvscRm+s dQ8m5hAAlW8TjNbhxK47GXemn87euncgH4U4lZRdfCGFvWUHu/N9pY6IGoTkZNuGAeOLtPJP d4NMYRjkW07w1AcgzX7Lduuob/Y1Jnve1siLlWSDT0ZzrRdtPRSlKq8Q22UX2KGZc+O9hEPH 7y36w6dlaoSOvRowRq+H0ky+YbMpCyIwuV1maeo4H7KTJ/6Tr+WrZyjAWDSEsuXJveNfzXiZ Z8WjrYJQEuXcOnS2/14cxql9ij9aACfWcqanwroMzEglZnVJ4GnExwCOSs6hiFmfhOaPg7bM VSwnzxc4A6oz/rguAeo+DMj7apsNliQNwG5/jN+eBqvvFmEpunGE69l4O3gaLcUtapUEU53M MjQdGqAPGpl2L/zcnI7cT0sIaQSvFuYu50RuGmi9Dq4MbYTHD2wRhcpapMZ9c221uAXWIJri NJCU2qfoBbrHw5YRwtoYogMfLnBqKAxwr1H3pxbjkxzMGDe2uhMuY8i0o6oGZqbf0qok399x t169YP48F6ie6x/U7lwIN09UmMwVXxm0qxRNfFf16xz/+ybKF63FZjl03c0qwtDBQ/6aPH+b Z2CS51Z4IZkDonDscYKODb+XhS1lhufnkNVprd5MNXZWXJUlE3f7WQzLDrvr0lUmR4BiunCo mRlpWKOasO1JzqIbhLBJllPgxSVUlvuOtsX6ufnEyGHOwU0EZG2BhQEQAMA5wA+aEsxcNCYg 40S8dwAcpMalIYh1jVRmTZwDjfSlz7cfbVJGRs4Fpql0Dbzc6XYcVDJE905CJCo5ARXI+E28 KmmdsgtlM5kaU0bcufLdWFOBlY8fRvTvz3wS6LcD66wEtg1G2Uc+RcG3Y3GPxuLwHSxVgJWF D3sMpIWEHGDI+E7gnJnNjHnGISdrVKWX96X/vf7jABJL3J/TC/gcYSlIXfL5qnlWK6wNQIn6 IoMen6A6woW78E9wBIIQ7d5s/+5DKQz4vpWzRXYojIpLsacOZYimxfEdFyIArKGTunG7avDr mde97B5TODXV/oOa3BNwzp7rk5WokQkQVUev+4bjtrJ3vsUfaGiZlOLGtf+JMykhNTALoAQa RG6GNHBLK8eN760JAhkV5BaO9/QNK2MgJkChnosOhXNziP26O7cZhzGbhChqCNmpfGg2pCAK a2H5cKuac13BzfD5bI/ZG24VyCYy5PCjMvS/0LWArvoYZStSp3N+7KOqUG0bFlfoiK1xkTUX ragcoVv1o6FATs31s3KqBF3oTcxlsRWLLlqhEavDJz3XWsTqbexVZ+h0zY6rFBhOwLH+XNsB Jz14W8mLZMR9vcqDowYQiS41Vuyhfyi20MfEOJjgdM2Vaa08hMXZzrZ8CNOF/nF2JhhTDbFY +BKoNe+6BXgrvStIkbT7ABEBAAHCwXwEGAEIACYWIQT5PVIa69RpUDjZpjF++xxGb6x1DwUC ZG2BhQIbDAUJB4YfIQAKCRB++xxGb6x1D+lYEADDhQSJA0h7aNh4A8MXIqNJ+09+wxCf8jJE c975L2MTG1Z9bmuwISXlr/fBxIHJ9Qt3N3noL2jLUpNwSva9dzbGBIPx5icF1RuIs5Y3wLTV u/ug4pFO/h2NPgbUdhQRY8Zn0bjIlGVBjPJAqrqmigKKIqx7122ObES/jW8RTgm9lnkhz4ea SueamFFtiC65DRHjch7rQub6XPKvfYecIbzZHvuFyumvCrBp+zdDb6VGrq02GfxA1xe72eDA gAESV/1jjTak2HC/02ps204k5RnLkjqwKoRwFPbRcbn8dVpJV5aQ9sXeNSPtT+X871wfcEcR Tt6b9/3eCqTlak0WebzcBJ3k4p6xMROuKKpmHXQBRvseBAOWJ2dBHANICyYPM722+xwMW1f7 NM0iw/pJw/FU242vogiLvo3IxZibhU38SFmuxsbnCe+HXFYuoXKvcRcWzh2QPM7X7izLgHV2 JUotbB6ReYuMcyZYqLxBcw1PFsS0/skl/zGy5He6HBL4gXbQCb/0h/x6j7yN4l9p3Y/lQbGC A4cdfea9HUphzAHslGgVv2tTVonxmr8do+y2+7QH2UDxUlBD2oGLd/z9QXvx3KiChC3Hkgdi NkEA1c+lA7vlcwUF6WLyBytCHkXSKaDcldIogZW8FNE/yHtICxApnN6CmXpsDZOZ+bOfAkyj mA== In-Reply-To: <81B0134C-1619-4765-BA21-B81DAD0D918D@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Message-ID-Hash: TLIRV7JN6NUWVYHLYCVB2ZSWYYCZ6H2V X-Message-ID-Hash: TLIRV7JN6NUWVYHLYCVB2ZSWYYCZ6H2V X-MailFrom: mayer@pdmconsulting.net 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: 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 7/20/26 6:13 PM, Sarah Grant wrote: > Thank you both for your feedback. I think the EF length has been addressed, and limiting the size to 8 bits should cap the length. > > However I don't understand this: > >> On 20 Jul 2026, at 12:01, Miroslav Lichvar wrote: >> >> If it needs to work in both NTPv4 and NTPv5, yes, that would make >> sense to me, assuming 255 bytes as the maximum length is sufficient. >> >> If it was only for NTPv5 (which allows EF lengths not divisible by 4) >> the additional length field wouldn't be necessary. The client would >> know it got everything when the EF in the response is shorter than in >> the request. > There isn't an additional length field I don't think. What we've written is not much different than how NTPv5 describes the structure of EFs. Can you please clarify? > 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. Danny