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#NTP

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Marianne Spiller<p><a href="https://konfigurationsmanufaktur.de/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a>. <a href="https://konfigurationsmanufaktur.de/tags/NTPSEC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTPSEC</span></a>. <a href="https://konfigurationsmanufaktur.de/tags/systemd" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>systemd</span></a>-timesyncd. <a href="https://konfigurationsmanufaktur.de/tags/chrony" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>chrony</span></a>. Gibt's irgendwo eine hübsche Gegenüberstellung, wer was (besser) kann? 🤔</p>
Simon Zerafa<p>A list of known Time formatting and storage bugs as documented by Wikipedia:</p><p>Note the 2036 NTP issue which occurs before the more well known 2038 Unix Date "Epocolypse" 🤔</p><p>Apparently the XBox 360 has a known issue where the system time on the Xbox 360 console can only be advanced until 23:59 on 31 December 2025. </p><p>The system will continue to advance into 2026 and beyond; however, users cannot set the system date past this point</p><p><a href="https://en.wikipedia.org/wiki/Time_formatting_and_storage_bugs" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">en.wikipedia.org/wiki/Time_for</span><span class="invisible">matting_and_storage_bugs</span></a></p><p><a href="https://infosec.exchange/tags/UnixTime" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>UnixTime</span></a> <a href="https://infosec.exchange/tags/Epocolypse" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Epocolypse</span></a> <a href="https://infosec.exchange/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> <a href="https://infosec.exchange/tags/XBox360" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>XBox360</span></a></p>
Scott Laird<p>Okay, hopefully that's it for <a href="https://hachyderm.io/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> for now:</p><p><a href="https://scottstuff.net/posts/2025/05/19/ntp-limits/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">scottstuff.net/posts/2025/05/1</span><span class="invisible">9/ntp-limits/</span></a></p><p>I'm seeing up to 200 ns of difference between various GPS devices on my desk (one outlier, should really all be closer to that) plus 200-300 ns of network-induced variability on NTP clients, giving me somewhere between 200 and 500 ns of total error, depending on how I measure it.</p><p>So, it's higher than I'd really expected to see when I started, but *well* under my goal of 10 μS.</p>
Scott Laird<p>Ah ha! Here we go, a reasonably fundamental limit to <a href="https://hachyderm.io/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> accuracy on my network.</p><p>I'm starting think that ~300ns is about the limit of time accuracy on my network, and even that's probably a bit optimistic.</p><p>Here's one solid example. I have 2 identical NTP servers (plus several non-identical ones that I'm ignoring here) with their own antennas connected at different points on my network. Then I have 8 identical servers syncing their time from NTP once per second using Chrony.</p><p>This is a graph of the delta between NTP1's 1-hour median offset and NTP2's 1-hour median offset, showing one line for each server.</p><p>Notice that half of them think that NTP1 is faster and half think that NTP2 is faster.</p><p>This is almost certainly due to ECMP; each server is attached to 2 L3 switches. Each NTP server is connected to a different L2 switch, and each of those L2 switches are connected to both L3 switches via MLAG.</p><p>For some reason, one ECMP path seems to be faster than the other, so server-NTP pairs that hash onto the fast path go 200-400ns faster than server-NTP pairs that take the other path.</p>
JJ Celery<p>Let's take a moment to remember the guy who made sure we don't have to change Every Goddamn Clock today, David L. Mills, creator of Network Time Protocol (NTP) who passed last year.</p><p>My wristwatch is synced to my phone, which is synced to the internet, which knows that time it is right now thanks to David Mills. Cheers to his memory 🥃</p><p><a href="https://cse.engin.umich.edu/stories/remembering-alum-david-mills-who-brought-the-internet-into-perfect-time//" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">cse.engin.umich.edu/stories/re</span><span class="invisible">membering-alum-david-mills-who-brought-the-internet-into-perfect-time//</span></a></p><p><a href="https://mastodon.ie/tags/DST" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DST</span></a> <a href="https://mastodon.ie/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> <a href="https://mastodon.ie/tags/FOSS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FOSS</span></a></p>
argv minus one<p><span class="h-card"><a href="https://oldbytes.space/@feoh" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>feoh</span></a></span> <span class="h-card"><a href="https://mas.to/@controlfreak" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>controlfreak</span></a></span> <span class="h-card"><a href="https://infosec.exchange/@catsalad" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>catsalad</span></a></span> </p><p>Recently, I moved a server/router/desktop to another motherboard. Upon booting, ping worked, but web browsing didn't. All <a href="https://mastodon.sdf.org/tags/DNS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DNS</span></a> lookups were failing.</p><p>Turns out the clock was off by half a day. The DNS server couldn't resolve with an incorrect clock, and <a href="https://mastodon.sdf.org/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> couldn't discover the correct time because it couldn't use DNS to look up NTP servers' IP addresses.</p><p>So yeah, it's DNS. It's always DNS.</p><p><a href="https://mastodon.sdf.org/tags/IT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IT</span></a></p>
IT News<p>LED Wall Clock Gets Raspberry Pi Pico Upgrade - When [Rodrigo Feliciano] realized that the reason his seven-segment LED wall clock... - <a href="https://hackaday.com/2025/01/01/led-wall-clock-gets-raspberry-pi-pico-upgrade/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2025/01/01/led-wa</span><span class="invisible">ll-clock-gets-raspberry-pi-pico-upgrade/</span></a> <a href="https://schleuss.online/tags/microcontrollers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>microcontrollers</span></a> <a href="https://schleuss.online/tags/sevensegmentled" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sevensegmentled</span></a> <a href="https://schleuss.online/tags/clockhacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clockhacks</span></a> <a href="https://schleuss.online/tags/pipicow" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pipicow</span></a> <a href="https://schleuss.online/tags/kicad" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>kicad</span></a> <a href="https://schleuss.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
Kevin Karhan :verified:<p><span class="h-card" translate="no"><a href="https://waldvogel.family/@marcel" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>marcel</span></a></span> <span class="h-card" translate="no"><a href="https://mastodon.social/@weezmgk" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>weezmgk</span></a></span> yeah, so the frequency stability is garbage.</p><ul><li>Personally, I ban every <a href="https://infosec.space/tags/clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clock</span></a> that doesn't support sync via <a href="https://infosec.space/tags/DCF77" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DCF77</span></a> or <a href="https://infosec.space/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> and isn't a wristwatch!</li></ul>
IT News<p>Recreating a Popular Faux-Nixie Clock - There’s a good chance you’ve seen “Nixie clocks” on the Internet that replace the ... - <a href="https://hackaday.com/2024/09/13/recreating-a-popular-faux-nixie-clock/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2024/09/13/recrea</span><span class="invisible">ting-a-popular-faux-nixie-clock/</span></a> <a href="https://schleuss.online/tags/microcontrollers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>microcontrollers</span></a> <a href="https://schleuss.online/tags/clockhacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clockhacks</span></a> <a href="https://schleuss.online/tags/nixieclock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nixieclock</span></a> <a href="https://schleuss.online/tags/fakenixie" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fakenixie</span></a> <a href="https://schleuss.online/tags/nixietube" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nixietube</span></a> <a href="https://schleuss.online/tags/clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clock</span></a> <a href="https://schleuss.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a> <a href="https://schleuss.online/tags/rtc" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rtc</span></a></p>
✨🇪🇺 Mia’s Simulacrum 🏳️‍⚧️✨<p>Could it be that the atomic clock of the PTB in Germany is somehow 2ms off to the GPS time?</p><p>I have some odd results by comparing this thing to a bunch of stratum 1 NTP Server, and it is such an outlier that it is significant.</p><p>Although I want not to believe that we have different time keepers that just do a little bit of their own thing it is still possible… but pls don’t.</p><p><a href="https://lgbtqia.space/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> <a href="https://lgbtqia.space/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
Wolfgang Stief<p>I especially like the "on Earth and in Space" part of the subtitle. <a href="https://mastodon.social/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
IT News<p>Saving a Clock Radio with an LM8562 - Smart phones have taken the place of a lot of different devices especially as they... - <a href="https://hackaday.com/2024/03/28/saving-a-clock-radio-with-an-lm8562/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2024/03/28/saving</span><span class="invisible">-a-clock-radio-with-an-lm8562/</span></a> #7-segmentdisplay <a href="https://schleuss.online/tags/multiplexing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>multiplexing</span></a> <a href="https://schleuss.online/tags/clockhacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clockhacks</span></a> <a href="https://schleuss.online/tags/alarmclock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>alarmclock</span></a> <a href="https://schleuss.online/tags/clockradio" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clockradio</span></a> <a href="https://schleuss.online/tags/esp8266" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>esp8266</span></a> <a href="https://schleuss.online/tags/clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clock</span></a> <a href="https://schleuss.online/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a> <a href="https://schleuss.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
Willard Goosey<p>Retrocomputing has its annoyances, but I swear, <a href="https://mastodon.sdf.org/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> clients with outdated <a href="https://mastodon.sdf.org/tags/DST" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DST</span></a> rules are the worst!</p><p>(Willard goes off to experiment with <a href="https://mastodon.sdf.org/tags/MTCP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>MTCP</span></a> )</p>
IT News<p>Simple NTP Clock Uses Custom RGB 7-Segment Displays - A great majority of hackers build a clock at some point. It’s a great way to get f... - <a href="https://hackaday.com/2024/03/17/simple-ntp-clock-uses-custom-rgb-7-segment-displays/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2024/03/17/simple</span><span class="invisible">-ntp-clock-uses-custom-rgb-7-segment-displays/</span></a> <a href="https://schleuss.online/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>time</span></a>-keeping <a href="https://schleuss.online/tags/clockhacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clockhacks</span></a> <a href="https://schleuss.online/tags/clock" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>clock</span></a> <a href="https://schleuss.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
peter honeyman<p>This is quite an interesting article about Dave Mills, who passed away last month, with a lot of details about his time at Michigan (BSE Engineering Science 1961, BSE Mathematics 1961, MSE Electrical Engineering 1962, MS Communication Sciences 1964, PhD Computer and Communications Science 1971).</p><p><a href="https://cse.engin.umich.edu/stories/remembering-alum-david-mills-who-brought-the-internet-into-perfect-time" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">cse.engin.umich.edu/stories/re</span><span class="invisible">membering-alum-david-mills-who-brought-the-internet-into-perfect-time</span></a></p><p><a href="https://a2mi.social/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a></p>
Stephen Repetski<p>Inventor of <a href="https://dmv.community/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> protocol that keeps time on billions of devices dies at age 85</p><p><a href="https://arstechnica.com/gadgets/2024/01/inventor-of-ntp-protocol-that-keeps-time-on-billions-of-devices-dies-at-age-85/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">arstechnica.com/gadgets/2024/0</span><span class="invisible">1/inventor-of-ntp-protocol-that-keeps-time-on-billions-of-devices-dies-at-age-85/</span></a></p>
IT News<p>Inventor of NTP protocol that keeps time on billions of devices dies at age 85 - Enlarge / A photo of David L. Mills taken by David Woolley on April 27,... - <a href="https://arstechnica.com/?p=1997331" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="">arstechnica.com/?p=1997331</span><span class="invisible"></span></a> <a href="https://schleuss.online/tags/networktimeprotocol" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>networktimeprotocol</span></a> <a href="https://schleuss.online/tags/internetpioneers" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>internetpioneers</span></a> <a href="https://schleuss.online/tags/internethistory" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>internethistory</span></a> <a href="https://schleuss.online/tags/theinternet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>theinternet</span></a> <a href="https://schleuss.online/tags/davemills" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>davemills</span></a> <a href="https://schleuss.online/tags/retrotech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>retrotech</span></a> <a href="https://schleuss.online/tags/vintcerf" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>vintcerf</span></a> <a href="https://schleuss.online/tags/arpanet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>arpanet</span></a> <a href="https://schleuss.online/tags/biz" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>biz</span></a>⁢ <a href="https://schleuss.online/tags/nsfnet" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>nsfnet</span></a> <a href="https://schleuss.online/tags/tech" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>tech</span></a> <a href="https://schleuss.online/tags/ping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ping</span></a> <a href="https://schleuss.online/tags/ftp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ftp</span></a> <a href="https://schleuss.online/tags/ntp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ntp</span></a></p>
Chuck Darwin<p><span class="h-card" translate="no"><a href="https://m.blank.org/@memory" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>memory</span></a></span> <br>RIP: David Mills</p><p>In 1977, Mills began working at <a href="https://c.im/tags/COMSAT" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>COMSAT</span></a>. </p><p>There he worked on synchronizing the clocks of computers connected to <a href="https://c.im/tags/ARPANET" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ARPANET</span></a>, inventing the Network Time Protocol. <a href="https://c.im/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a></p><p>He told The New Yorker in 2022 that he enjoyed working on synchronized time because no one else was working on it, giving him his own "little fief".</p><p>In the mid-2000s, Mills turned over full control of the NTP reference implementation to Harlan Stenn.</p><p>Mills was the chairman of the Gateway Algorithms and Data Structures Task Force ( <a href="https://c.im/tags/GADS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>GADS</span></a> ) and the first chairman of the Internet Architecture Task Force.</p><p>He invented the DEC LSI-11 based <a href="https://c.im/tags/Fuzzball" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Fuzzball</span></a> router that was used for the 56 kbit/s NSFNET (1985), inspired the author of <a href="https://c.im/tags/ping" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ping</span></a> for BSD (1983), and had the first <a href="https://c.im/tags/FTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FTP</span></a> implementation. He authored numerous <a href="https://c.im/tags/RFCs" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RFCs</span></a>.</p>
Jan Schaumann<p>A detailed article from 2022 on David Mills (who just died), <a href="https://mstdn.social/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a>, and a bit of history of internet time keeping (which is such a fascinating topic and problem):</p><p><a href="https://www.newyorker.com/tech/annals-of-technology/the-thorny-problem-of-keeping-the-internets-time" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">newyorker.com/tech/annals-of-t</span><span class="invisible">echnology/the-thorny-problem-of-keeping-the-internets-time</span></a></p>
John Kristoff<p>David Mills, a true Internet pioneer, passed away on January 17, 2024. Probably best known for having led the development and maintenance of <a href="https://infosec.exchange/tags/NTP" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NTP</span></a> for decades, he was also involved in a great deal of early Internet protocol development.</p><p><a href="https://elists.isoc.org/pipermail/internet-history/2024-January/009265.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">elists.isoc.org/pipermail/inte</span><span class="invisible">rnet-history/2024-January/009265.html</span></a></p>
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