Re: [Ntp] [EXTERNAL] Re: Antw: Re: Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt
Doug Arnold <doug.arnold@meinberg-usa.com> Mon, 25 October 2021 22:11 UTC
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From: Doug Arnold <doug.arnold@meinberg-usa.com>
To: Denis Reilly <dreilly@equinix.com>, Martin Burnicki <martin.burnicki@meinberg.de>, Danny Mayer <mayer@pdmconsulting.net>, Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, "mlichvar@redhat.com" <mlichvar@redhat.com>, "halmurray+ietf@sonic.net" <halmurray+ietf@sonic.net>
CC: "ntp@ietf.org" <ntp@ietf.org>
Thread-Topic: [EXTERNAL] Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt
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Date: Mon, 25 Oct 2021 22:08:18 +0000
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Subject: Re: [Ntp] [EXTERNAL] Re: Antw: Re: Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt
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Thanks Denis. I completely agree. When it come to smearing, transparency is safer than trying to ban it. That is why a proposal like the one which Miroslav has in draft is needed. Doug From: Denis Reilly <dreilly@equinix.com> Date: Monday, October 25, 2021 at 5:14 PM To: Doug Arnold <doug.arnold@meinberg-usa.com>, Martin Burnicki <martin.burnicki@meinberg.de>, Danny Mayer <mayer@pdmconsulting.net>, Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, mlichvar@redhat.com <mlichvar@redhat.com>, halmurray+ietf@sonic.net <halmurray+ietf@sonic.net> Cc: ntp@ietf.org <ntp@ietf.org> Subject: Re: [EXTERNAL] Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt Leap smearing was one of the main topics of the BCP. Because we understand why it’s a good idea in many cases, but also why it can be perilous if handled incorrectly. In the BCP, we arrived at a few key guidelines, aiming to preserve the most flexibility to operators while still maintaining standard public behavior: - Don’t mix smearing and non-smearing servers - Don’t smear if your timestamps are required to be in sync with UTC - Only smear on totally private installations, do not smear on public servers In my view, these restrictions exist because there is no standardized way to detect that a server is smearing in ntpv4. So we settled on the notion that public interactions should use the standard timescale, while operators could do whatever they wanted in the privacy of their own networks. At minimum, NTPV5 should include a standardized way for the server to tell everyone else that it is smearing the timestamps on the wire, so that clients can elect to not use the server. In my opinion, there is no use in saying that smearing on the wire is not allowed in V5 – people will do it anyway. I think that we should also have a way for the server to broadcast the smearing algorithm in use on the network. This is, of course, valuable when servers are smearing, because then a client which knows about this can back-out the smearing behavior and obtain UTC time if it wants to. But it’s also valuable if the server is not smearing, because it can help coordinate client-side smearing in clients who are intelligent enough. (In other words, if all nodes updated to NTPv5 with support for this, the server could keep the timestamps as RFC-compliant non-smeared UTC on the wire while telling all clients how to apply the leap smear uniformly if they need to, getting the best parts of client-side and server-side smearing together, while keeping the wire timestamps in UTC.) In my opinion, we should aim preserve the most flexibility. We should make it easier for operators to do client-side or server-side smearing, and we should allow operators using servers outside their administrative domain to reject servers who apply rules they don’t like. We’re not going to get everyone to agree on one behavior, the best we can do is make sure that behaviors are standardized and easy to implement. To me it seems like we would get a lot of benefit out of adding a few extensions. There have been attempts to standardize this in the past, maybe we can get it done in V5 (just in time for leap seconds to be abolished). -- Denis Reilly Principal Timing Architect, Equinix Precision Time dreilly@equinix.com<mailto:dreilly@equinix.com> | +1-585-282-7899 From: ntp <ntp-bounces@ietf.org> on behalf of Doug Arnold <doug.arnold=40meinberg-usa.com@dmarc.ietf.org> Date: Friday, October 22, 2021 at 11:06 AM To: Martin Burnicki <martin.burnicki@meinberg.de>, Danny Mayer <mayer@pdmconsulting.net>, Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>, "mlichvar@redhat.com" <mlichvar@redhat.com>, "halmurray+ietf@sonic.net" <halmurray+ietf@sonic.net> Cc: "ntp@ietf.org" <ntp@ietf.org> Subject: [EXTERNAL] Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New Version Notification for draft‑gruessing‑ntp‑ntpv5‑requirements‑03.txt My understanding is that Google builds all of its own timing infrastructure, so they can start with smearing as a part of their architecture. Now everyone wants to copy the Google Spanner approach to distributed data bases, but with timing from vendors and open source projects. I wish them luck. On 10/22/21, 8:19 AM, "Martin Burnicki" <martin.burnicki@meinberg.de> wrote: Danny Mayer wrote: > On 10/22/21 6:00 AM, Martin Burnicki wrote: >> As I've tried to point out earlier, in any case it's the task of an >> administrator to ensure a proper configuration: >> >> - If there are smearing and not-smearing servers, he has to configure >> which clients should query the time from which servers. >> >> - If the clients should do the smearing, he had to configure each >> individual client whether to smear, or not. >> >> - If a smearing server would only reply to authenticated requests, he >> had to configure on each client which server(s) to use, and which >> keys, and it wouldn't even be possible to hide the leap second from >> dumb clients. >> > You also need to worry about the cascading effects of a server accepting > smeared time turning around a sending out smeared timestamps in response > to requests from downstream clients. Smearing cannot be considered in > isolation. Correct. Cascading servers, mixing smearing and non-smearing time sources, providing smearing clients with a leap second file, etc. are another stage of potential problems an admin has to keep in mind in all of the cases I mentioned. As I said, smearing is a hack, and I just wanted to point out that it's not easier to let the clients do the smearing, as some folks here seem to assume. In fact, one of the original reasons why Google introduces server-side smearing was that the only had to configure this on a few servers, and the configuration of a huge number of clients that were anyway sync'ing to those servers didn't need to be touched. Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: martin.burnicki@meinberg.de<mailto:martin.burnicki@meinberg.de> Phone: +49 5281 9309-414 Linkedin: https://www.linkedin.com/in/martinburnicki/<https://urldefense.com/v3/__https:/www.linkedin.com/in/martinburnicki/__;!!PcPv50trKLWG!gybm7Ic-FCTLPuRyEr00WxnwopPwJPP057utZzRBe6qBJBGqem1MRt08mOfAMNRG$> Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322 Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung Websites: https://www.meinberg.de<https://urldefense.com/v3/__https:/www.meinberg.de__;!!PcPv50trKLWG!gybm7Ic-FCTLPuRyEr00WxnwopPwJPP057utZzRBe6qBJBGqem1MRt08mMAr9L8v$> https://www.meinbergglobal.com<https://urldefense.com/v3/__https:/www.meinbergglobal.com__;!!PcPv50trKLWG!gybm7Ic-FCTLPuRyEr00WxnwopPwJPP057utZzRBe6qBJBGqem1MRt08mPZeVtZc$> Training: https://www.meinberg.academy<https://urldefense.com/v3/__https:/www.meinberg.academy__;!!PcPv50trKLWG!gybm7Ic-FCTLPuRyEr00WxnwopPwJPP057utZzRBe6qBJBGqem1MRt08mNntA4yb$>
- [Ntp] Fwd: New Version Notification for draft-gru… James
- [Ntp] Antw: [EXT] Fwd: New Version Notification f… Ulrich Windl
- Re: [Ntp] Fwd: New Version Notification for draft… Doug Arnold
- [Ntp] Antw: [EXT] Re: Fwd: New Version Notificati… Ulrich Windl
- Re: [Ntp] New Version Notification for draft-grue… James
- Re: [Ntp] New Version Notification for draft-grue… Doug Arnold
- Re: [Ntp] New Version Notification for draft-grue… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… Salz, Rich
- Re: [Ntp] New Version Notification for draft-grue… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… Salz, Rich
- Re: [Ntp] New Version Notification for draft-grue… Salz, Rich
- Re: [Ntp] New Version Notification for draft-grue… James
- Re: [Ntp] New Version Notification for draft-grue… James
- Re: [Ntp] New Version Notification for draft-grue… Salz, Rich
- Re: [Ntp] New Version Notification for draft-grue… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… Hal Murray
- [Ntp] Antw: [EXT] Re: New Version Notification fo… Ulrich Windl
- [Ntp] Antw: [EXT] Re: New Version Notification fo… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Danny Mayer
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… Miroslav Lichvar
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Warner Losh
- Re: [Ntp] New Version Notification for draft-grue… James
- Re: [Ntp] New Version Notification for draft-grue… Salz, Rich
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Hal Murray
- Re: [Ntp] New Version Notification for draft-grue… Miroslav Lichvar
- Re: [Ntp] New Version Notification for draft-grue… Miroslav Lichvar
- [Ntp] Antw: [EXT] Re: New Version Notification fo… Ulrich Windl
- [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notif… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Hal Murray
- [Ntp] Antw: [EXT] Re: New Version Notification fo… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Miroslav Lichvar
- [Ntp] Antw: [EXT] Re: New Version Notification fo… Ulrich Windl
- [Ntp] Antw: [EXT] Re: New Version Notification fo… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Miroslav Lichvar
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Miroslav Lichvar
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Warner Losh
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Tony Finch
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Danny Mayer
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Danny Mayer
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Warner Losh
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Tony Finch
- [Ntp] Antw: Re: Re: Antw: [EXT] Re: New Version N… Ulrich Windl
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Miroslav Lichvar
- [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notif… Ulrich Windl
- Re: [Ntp] New Version Notification for draft-grue… Dieter Sibold
- Re: [Ntp] New Version Notification for draft-grue… kristof.teichel
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Hal Murray
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Martin Burnicki
- [Ntp] Antw: Re: Antw: [EXT] Re: New Version Notif… Ulrich Windl
- Re: [Ntp] New Version Notification for draft-grue… Hal Murray
- Re: [Ntp] New Version Notification for draft-grue… kristof.teichel
- Re: [Ntp] Antw: Re: Antw: [EXT] Re: New Version N… Martin Burnicki
- Re: [Ntp] New Version Notification for draft-grue… Doug Arnold
- Re: [Ntp] Antw: Re: Antw: [EXT] Re: New Version N… Doug Arnold
- Re: [Ntp] New Version Notification for draft-grue… kristof.teichel
- Re: [Ntp] Antw: [EXT] Re: New Version Notificatio… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… James
- [Ntp] Antwort: Re: New Version Notification for d… kristof.teichel
- [Ntp] Antwort: Re: Antw: [EXT] Re: New Version No… kristof.teichel
- Re: [Ntp] Antwort: Re: New Version Notification f… Doug Arnold
- Re: [Ntp] Antwort: Re: New Version Notification f… Danny Mayer
- Re: [Ntp] New Version Notification for draft-grue… Steve Allen
- Re: [Ntp] Antw: Re: Antw: [EXT] Re: New Version N… Hal Murray
- [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New Ver… Ulrich Windl
- [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New Ver… Ulrich Windl
- Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New… Martin Burnicki
- Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New… Martin Burnicki
- Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New… Martin Burnicki
- Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New… Danny Mayer
- Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New… Martin Burnicki
- [Ntp] Antw: Re: Antw: Re: Antw: Re: Antw: [EXT] R… Ulrich Windl
- Re: [Ntp] Antw: Re: Antw: Re: Antw: [EXT] Re: New… Doug Arnold
- Re: [Ntp] [EXTERNAL] Re: Antw: Re: Antw: Re: Antw… Denis Reilly
- Re: [Ntp] [EXTERNAL] Re: Antw: Re: Antw: Re: Antw… Doug Arnold
- Re: [Ntp] [EXTERNAL] Re: Antw: Re: Antw: Re: Antw… Martin Burnicki
- Re: [Ntp] changes in length of day, was Re: New V… Tony Finch
- [Ntp] Antw: Re: [EXTERNAL] Re: Antw: Re: Antw: Re… Ulrich Windl