#ntp — Public Fediverse posts

Weekend Reads

* Rolling the DNS root key
https://www.potaroo.net/ispcol/2026-05/kskroll.html
* Measuring Internet censorship
https://ooni.org/post/2026-measuring-internet-censorship-trends-challenges-impact/
* How an HTTP header caused time.gov skew
https://alexsci.com/blog/how-time-gov-works/
* Password manager infrastructure in-the-wild
https://censys.com/blog/password-manager-infrastructure/
* Investigating NRS outreach to AFRINIC members
https://circleid.com/posts/registry-under-siege-investigating-nrs-outreach-to-afrinic-members

#DNS #DNSSEC #Censorship #NTP #PasswordManagers #AFRINIC

This fellow's blog is fascinating! I've wondered about the leapsecond expiry message for a while now, and now I know more about it!

https://blog.frankleonhardt.com/2026/freebsd-error-leapsecond-file-expired/

He offers his blog via RSS, too.

#freebsd #ntp

https://www.fogolf.com/1247678/we-know-whats-best-for-tiger-woods/ We Know What’s Best for Tiger Woods #2Bears1Cave #2B1C #AriShaffir #AustinPodcast #BehindTheJeans #BertKreischer #Charo #ChrisDistefano #ChristinaP #ChristinaPazsitzky #DannyBrown #DannyBrownShow #FirstDate #HighAndTight #JamieLynnSigler #Jeans #JoshPotter #LaurenCompton #mommies #NotTodayPal #ntp #Podcast #RobIler #TheDannyBrownShow #TheSopranos #TigerWoods #TomSegura #up #What'sWithTheJeans #YannisPappas #ybt #ymh #YMHStudios #YouBeTrippin' #YourMomsHouse

https://www.fogolf.com/1247678/we-know-whats-best-for-tiger-woods/ We Know What’s Best for Tiger Woods #2Bears1Cave #2B1C #AriShaffir #AustinPodcast #BehindTheJeans #BertKreischer #Charo #ChrisDistefano #ChristinaP #ChristinaPazsitzky #DannyBrown #DannyBrownShow #FirstDate #HighAndTight #JamieLynnSigler #Jeans #JoshPotter #LaurenCompton #mommies #NotTodayPal #ntp #Podcast #RobIler #TheDannyBrownShow #TheSopranos #TigerWoods #TomSegura #up #What'sWithTheJeans #YannisPappas #ybt #ymh #YMHStudios #YouBeTrippin' #YourMomsHouse

[Перевод] Синхронизация часов — это кошмар

Кажется, что время — это просто. Но мы, инженеры, теряем сон из-за такой простой задачи, как синхронизация часов. Причина этого в том, что не существует каких-то глобальных часов. У нас есть тысячи машин, распределённых по дата-центрам, континентам и часовым поясам; каждая из них работает независимо от других, поэтому ответ на простой вопрос «сколько сейчас времени?» оказывается на удивление сложным. Синхронизация часов становится основой самых сложных задач в распределённых системах, она влияет на всё, от согласованности баз данных и отладки до финансовых транзакций.

https://habr.com/ru/companies/ruvds/articles/1030464/

#синхронизация_времени #ntp #ptp #атомные_часы #ruvds_перевод

From Milliseconds to 26 Nanoseconds: How a $20 eBay SFP Module Beat My Entire NTP Setup

https://austinsnerdythings.com/2026/04/26/ptp-osa5401-26-nanoseconds-raspberry-pi/

I think we can get Subspace 3.0 up and running cheaper now @joew

#NTP #GPS #Chrony

RFC 5905 uses a Bellman-Ford variant to find the shortest-path tree rooted on primary servers. This lets NTP automatically reroute to accurate sources when parts of the network fail.

#NTP #Fintech

NTP runs over UDP port 123. Its on-wire protocol uses four timestamps per exchange to compute clock offset and round-trip delay, and requires no reliable delivery.

#NTP #RFC5905 #Fintech

NTP syncs clocks across networks to UTC. Defined in RFC 5905 (IETF), it exists so distributed nodes share a common time reference to order events correctly.

#NTP #DistributedSystems #Fintech

I ended up building my own web clock (https://clock.alexsci.com/) as I debugged what was happening on https://time.gov. It's a fun web application performance problem as it's extremely sensitive to networking effects. PerformanceResourceTiming cuts out enough noise that the results are much closer to #NTP.

Blogged: My public NTP Server, one year later: Hardware upgrades, better RF, and OSNMA

https://www.tabsoverspaces.com/id/233969

#time #ntp #cm4 #raspberrypi #ptp

BSDCan https://www.bsdcan.org/2026/ Talk Friday 2026-06-19: 13:15 - 14:05 DMS 1130
OpenNTPD - 20 years and a few milliseconds later
Henning Brauer
https://www.bsdcan.org/2026/timetable/timetable-OpenNTPD---20.html
To register https://www.bsdcan.org/2026/registration.html @bsdcan #openbsd #openntpd #ntp #freebsd

Ловим время в формате DCF77

В комментариях к "серверу точного времени" ( https://habr.com/ru/articles/1023414 ) предлагали вдобавок к NTP и GPS подключить еще и DCF77, как еще один источник времени. И я таки сделал это, хоть и в виде отдельной железки, а поскольку техника тут аналоговая - были свои нюансы. В качестве справки: DCF77 - это радиостанция, передающая точное время от атомных часов, собственно, это ее основное назначение. Расположена в Европе, в Германии, неподалеку от Франкфурта. Вещает на длинных волнах на всю Европу, захватывая в том числе часть exUSSR. Передает сигнал, содержащий информацию о времени и дате, UTC+1/UTC+2 в зависимости от "летнего времени". Также передает местную погоду и может быть использована как средство оповещения, но нас это мало касается. Рабочая частота 77.5 кГц - поэтому и "DCF77". Её сигнал может быть использован для автонастройки электронных часов, для чего выпускаются недорогие модули, которые можно встраивать в различные устройства, там, в Европе. А вот у нас это всё работает довольно плохо. Проблема простая: расстояние. Несмотря на большую мощность передатчика и хорошее распространение длинных волн на большие расстояния - 2000 км это 2000 км.

https://habr.com/ru/articles/1026588/

#умный_дом #часы #радиосвязь #ардуино #ntp #dcf77 #электроника

DIY: Ардуино и сервер точного времени

Мы уже привыкли жить в глобальном информационном мире, где, с одной стороны, довольно важно знать точное время, а с другой стороны - легко его получить, достаточно настроить на компьютере NTP, да вот хотя бы просто выполнить команду типа ntpdate pool.ntp.org . Но есть нюанс: со всеми этими замедлениями, блокировками и "белыми списками" больше нет никакой гарантии, что как раз в нужный момент они не заблокируют нам и NTP протокол, ведь известные мировые NTP-сервера вряд ли будут в белых списках, а использовать какие-нибудь другие - ну, вспоминается история пропадания некоторых доменных имен из НСДИ, недоступность Гугла через мобильный интернет, и заявленный ввод платы "за доступ к часам точного времени", что бы под этим не подразумевалось. В общем, спасение утопающих... К тому же, как говорят, "любой, кто увидел Ардуино - рано или поздно делает часы или метеостанцию". Простые часы мы делать не будем, а сделаем вполне IT-шный NTP-сервер.

https://habr.com/ru/articles/1023414/

#diy #arduino #ntp #gps

Weekend Reads

* FreeBSD and TCP reordering
https://freebsdfoundation.org/wp-content/uploads/2026/04/stewart-adventures.pdf
* NTP Pool DNS geoloc tampering
https://community.ntppool.org/t/dns-configuration-tampering-on-one-of-our-geodns-servers/4300
* MacOS TCP timestamp clock bug
https://photon.codes/blog/we-found-a-ticking-time-bomb-in-macos-tcp-networking
* TLD and file extension collisions
https://arxiv.org/abs/2604.04805
* VPN provider infrastructure deconstructed
https://codamail.com/articles/vpn_exposed.html

#FreeBSD #TCP #NTP #DNS #MacOS #VPN

ntpd-rs-1.7.2 is released and on its way to @gentoo 🙌 🚀 :gentoo:

#gentoo #ntp #rust

Stratum 1 NTP-сервер на Raspberry Pi в 2026 году: DCF77 + GPS/PPS, chrony, libgpiod v2

Stratum 1 NTP-сервер на Raspberry Pi в 2025 году: DCF77 + GPS/PPS, chrony, libgpiod v2, когда все туториалы по «точному времени на Raspberry Pi» сломаны на современных системах. Разбираю почему — и показываю как сделать правильно.

https://habr.com/ru/articles/1018554/

#raspberrypi #C++ #linux #ntp #chrony #gps #dcf77

RE: https://old.mermaid.town/@futzle/115822614470070972

If you are using my NTP pool server ntp.polyfoam.com.au, and you've hardcoded the IP address, please hardcode the new IP address (v4 and v6) or use the DNS name. The DMZ address formerly used is now being firewalled.

#NTP #NTPPool

Secure time synchronization with NTS

https://blog.frehi.be/2026/03/29/secure-time-synchronization-with-nts/

Ubuntu will be adopting ntpd-rs as the default time sync client/server if all goes according to plan for release 27.04 (~2027). For most this means replacing chrony.

https://discourse.ubuntu.com/t/ntpd-rs-its-about-time/79154/1

#NTP

#Ubuntu Will Switch To ntpd-rs As Its Next Rust System Component - Phoronix
https://www.phoronix.com/news/Ubuntu-Switching-To-ntpd-rs
#ntp

I set up a GPS-reference Stratum-1 NTP server at home.

This was a neat project, but rather painful. Not sure I'd recommend it, honestly, but I learned a lot. See thread for some learnings and rantings.

1/x

#ntp #time #homelab #selfhost

Comment installer un serveur NTP local Chrony pour synchroniser les bases de temps sur vos différents équipements - Article détaillé par Hexamus chez DomoPi #NTP #SelfHosting https://domopi.eu/installer-un-serveur-ntp-local/

Blogged: Introducing NtpTick: A lightweight NTP client for .NET

https://www.tabsoverspaces.com/id/233966

#dotnet #csharp #ntp #time #clock #synchronization

FT8: The Digital Revolution of Modern Amateur Radio

2,237 words, 12 minutes read time.

FT8 is a digital communication protocol released in 2017 by Joe Taylor, K1JT, and Steve Franke, K9AN, designed to allow radio amateurs to exchange contact information under extreme weak-signal conditions. Operating primarily on High Frequency (HF) bands, FT8 uses a precise 15-second sequence of structured data bursts to transmit call signs, signal reports, and grid squares even when the human ear can hear nothing but static. This mode has fundamentally shifted the landscape of ham radio by enabling reliable global communication during the low points of the solar cycle, ensuring that operators can maintain “workable” signals despite poor ionospheric propagation. Its rapid adoption stems from its efficiency and the fact that it allows modest stations with simple wire antennas and low power to compete with massive “big gun” contest stations.

The technical backbone of FT8 is a specialized form of digital modulation known as 8-slot Frequency Shift Keying (8-FSK). This means the signal shifts between eight distinct tones, each representing a specific piece of data. Because the bandwidth is incredibly narrow—only 50 Hz—multiple conversations can happen simultaneously within a standard 3 kHz single-sideband radio channel without interfering with one another. To make this work, the protocol requires absolute synchronization. Every participating computer must have its internal clock set to within one second of Coordinated Universal Time (UTC). This allows the software to know exactly when to start listening for a message and when to begin transmitting its own response. Without this temporal precision, the sequence breaks down and the data becomes unreadable noise.

The “how” of FT8 is a masterclass in forward error correction and data compression. A standard FT8 message is only 75 bits long, yet it contains everything necessary to confirm a legal and valid contact. Joe Taylor, a Nobel Prize-winning astrophysicist, applied the same principles used to detect faint signals from deep space to the world of amateur radio. By using sophisticated algorithms, the software can reconstruct a message even if a significant portion of the signal is lost to fading or atmospheric interference. This capability allows FT8 to function at signal-to-noise ratios as low as -21 dB. To put that in perspective, an FT8 signal can be decoded when it is significantly weaker than the background noise of the universe itself.

The impact of this mode on the hobby cannot be overstated. Before FT8, many men found themselves frustrated by “dead bands” where hours of calling “CQ” yielded no results. FT8 turned the hobby into a 24/7 pursuit. According to the ARRL (American Radio Relay League), FT8 and its successor modes now account for a massive percentage of all amateur radio activity globally. It has bridged the gap between traditional radio technology and modern computing, appealing to men who enjoy the technical challenge of optimizing a digital interface while still respecting the core physics of radio wave propagation. It is the tool of the modern digital woodsman, carving out a path through the noise of a crowded spectrum.

The Mechanics of the 15-Second Cycle

Understanding the rhythm of FT8 is essential for any man looking to master the digital airwaves. The protocol operates on a rigid 15-second “time slot” system. In the first 12.64 seconds of a slot, the message is transmitted; the remaining time is used for the software to process the data and for the operator to prepare the next response. This “even/odd” sequence ensures that two stations aren’t talking over each other. One station transmits on the even-numbered minutes and 15-second intervals, while the other listens, then they swap. This disciplined structure removes the guesswork and chaos often found in voice or Morse code pile-ups, creating an orderly flow of information that maximizes the use of available airtime.

To get on the air with FT8, an operator needs more than just a radio and an antenna; he needs a bridge between the analog and digital worlds. This is usually achieved through a dedicated USB interface or a built-in sound card in modern transceivers. The software—most commonly WSJT-X—takes the digital data from the computer, converts it into audio tones, and feeds those tones into the radio’s transmitter. On the receiving end, the process is reversed. The radio “hears” a series of chirps and warbles, which the sound card captures and the software decodes back into text on the screen. This synergy of hardware and software is what makes FT8 a true “hybrid” mode of communication.

The software interface provides a “waterfall” display, a visual representation of the radio spectrum where signals appear as vertical blue or yellow streaks. This allows an operator to see exactly where the activity is and find an open “slot” to transmit. It is a highly visual and tactical way to operate. Instead of spinning a dial and listening for a faint voice, you are scanning a digital landscape, looking for the telltale signatures of other stations. For many men, this adds a layer of strategy to the hobby that is deeply engaging, akin to a high-stakes game of electronic chess where the board is the entire planet.

Why Signal-to-Noise Ratio Matters

In the world of radio, the Signal-to-Noise Ratio (SNR) is the ultimate metric of success. It is the difference between the strength of the desired signal and the level of background atmospheric noise. FT8 excels because it is “wideband” in its ability to hear, but “narrowband” in its transmission. Because the tones are so precise and the error correction so robust, FT8 can pull a signal out of a “noise floor” that would render a voice transmission completely unintelligible. This is the primary reason why FT8 is the go-to mode for “DXing”—the art of contacting long-distance stations. It levels the playing field, allowing a man with a 100-watt radio and a wire in his backyard to talk to someone in Antarctica or Japan.

The mathematical genius behind FT8 involves a process called “Costas arrays” and “Low-Density Parity-Check” (LDPC) codes. These are not just buzzwords; they are the tools that allow the software to identify the start of a transmission and fix any bits that were flipped or lost during the journey through the ionosphere. As Joe Taylor noted in his technical documentation for the WSJT-X suite, the goal was to create a mode that was “optimized for the specific characteristics of HF propagation.” By focusing on short, structured bursts rather than long-form conversation, FT8 prioritizes the successful completion of a contact over everything else.

This efficiency does come with a trade-off. FT8 is not a “rag-chewing” mode. You won’t be discussing the weather or your favorite sports team. The messages are strictly limited to the essentials: call sign, signal report (in dB), and location (maidenhead grid square). However, for many men, the thrill is in the “catch.” The satisfaction comes from seeing a distant, rare station pop up on the screen and successfully completing that 60-second digital handshake. It is a hobby centered on the achievement of technical milestones and the collection of digital “QSL” cards that prove you reached the far corners of the earth.

Integration with Modern Computing

The rise of FT8 has coincided with the ubiquity of high-speed internet and powerful home computers. This integration has led to the creation of the “PSK Reporter” network, a massive, real-time map of global radio propagation. When your computer decodes an FT8 signal, it can automatically upload that data to a central server. This allows any operator in the world to see exactly where their signal is being heard in real-time. It is a revolutionary tool for understanding the ionosphere. A man can send out a few “CQ” calls and then check a website to see that he is being heard in Spain, Australia, and Brazil, all within seconds.

This real-time feedback loop has changed the way men approach radio. It removes the mystery and replaces it with data. If you aren’t being heard, you can immediately troubleshoot your antenna or wait for the bands to open up. This data-driven approach appeals to the problem-solving nature of the masculine mind. It turns amateur radio into a laboratory where the results are visible and measurable. You aren’t just shouting into the void; you are probing the atmosphere and receiving instant confirmation of your reach.

Furthermore, FT8 has fostered a global community of “citizen scientists.” By contributing data to these networks, ham operators are helping researchers understand solar cycles and their impact on global communications. As noted in various IEEE publications, the sheer volume of data generated by FT8 operators provides a unique look at the Earth’s upper atmosphere that was previously impossible to obtain on such a scale. When you engage in FT8, you aren’t just playing with a radio; you are part of a global sensor network that monitors the very fringes of our planet’s environment.

The Role of Precision Timing

As mentioned, timing is the lifeblood of FT8. Because the protocol relies on such tight windows of transmission, even a two-second drift in your computer’s clock can make you invisible to the rest of the world. This has led to the widespread use of time-synchronization software like Dimension 4 or Meinberg NTP. For the radio enthusiast, this adds another layer of technical “shack” maintenance. Ensuring that your station is perfectly synced to the atomic clocks in Colorado or via GPS is a point of pride. It represents the discipline required to participate in high-level digital communications.

This requirement for precision also highlights the evolution of the amateur radio station. The modern “shack” is often a clean, streamlined desk featuring a high-resolution monitor and a sleek transceiver. Gone are the days of massive, heat-spewing vacuum tube amplifiers—though those still have their place. The FT8 operator is a digital navigator, managing signal levels, gain settings, and software configurations to ensure the cleanest possible signal. Over-driving the audio, for instance, creates “splatter” that ruins the frequency for others. Mastery of FT8 requires a gentleman’s agreement to maintain a clean signal and respect the shared bandwidth of the community.

The discipline of the 15-second cycle also introduces a meditative quality to the hobby. There is a cadence to it—transmit, wait, decode, respond. It requires focus and patience. You are watching the waterfall, waiting for that specific signal to emerge from the static. When the software finally highlights a successful decode in bright red or green, there is a genuine sense of accomplishment. It is a modern manifestation of the same thrill early radio pioneers felt when they first heard a Morse code signal crackle through their headsets a century ago.

FT8 and the Future of Amateur Radio

While some traditionalists argue that FT8 has taken the “human element” out of radio, the reality is that it has saved the hobby for thousands of men. In an era of high urban noise and restricted antenna space, FT8 allows a man to remain active and competitive. You don’t need a 100-foot tower to be a successful FT8 operator; a simple wire hidden in the attic can often be enough to work the world. It has democratized the airwaves, making the thrill of long-distance communication accessible to anyone with a basic radio and a laptop.

Looking forward, FT8 is just the beginning. The principles of weak-signal digital communication are being applied to even more robust modes like FT4 (a faster version for contesting) and JS8Call (which allows for actual keyboard-to-keyboard messaging). The technology is constantly evolving, driven by the same spirit of innovation that has defined amateur radio since its inception. As we move deeper into the 21st century, the marriage of radio physics and digital signal processing will only grow stronger, ensuring that the airwaves remain a vibrant frontier for exploration and discovery.

In conclusion, FT8 represents the pinnacle of modern amateur radio engineering. It is a mode built on the foundations of advanced mathematics, precise timing, and a deep understanding of the natural world. For the man who is looking to earn his license, FT8 offers a clear path toward global connectivity and technical mastery. It is a testament to the fact that even when the sun is quiet and the bands seem dead, there is always a way to reach out and touch the other side of the planet. The digital revolution is here, and it is chirping across the HF bands in 15-second increments, waiting for the next generation of operators to join the conversation.

Call to Action

If this story caught your attention, don’t just scroll past. Join the community—men sharing skills, stories, and experiences. Subscribe for more posts like this, drop a comment about your projects or lessons learned, or reach out and tell me what you’re building or experimenting with. Let’s grow together.

D. Bryan King

Sources

• WSJT-X Official Home Page – Princeton University
• ARRL: FT8 Most Popular Digital Mode
• PSK Reporter Real-Time Propagation Map
• Getting Started with FT8 – Essex Ham
• A Guide to FT8 Operating – QSL.net
• WSJT-X Users Group – Groups.io
• Digital Mode Interfaces – DX Engineering
• The FT8 Protocol White Paper
• RSGB FT8 Operating Guide
• Time.is – Synchronize Your Computer Clock
• FT8 Technical Overview – HF Underground Wiki
• Fldigi and Digital Mode Resources
• Icom Amateur Radio Digital Modes Overview

Disclaimer:

The views and opinions expressed in this post are solely those of the author. The information provided is based on personal research, experience, and understanding of the subject matter at the time of writing. Readers should consult relevant experts or authorities for specific guidance related to their unique situations.

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Weekend Reads

* Post-quantum RPKI framework
https://arxiv.org/abs/2603.06968
* DNSSEC negative trust anchors
https://quad9.net/news/blog/dnssec-ntas-no-good-compromises/
* AS112 deployment characteristics
https://0x03c0.com/files/pam26-as112-camera-ready-with-notice.pdf
* Geoff Huston on Internet timekeeping
https://www.potaroo.net/ispcol/2026-03/nts.html
* Measuring IX route servers prefix coverage
https://blog.benjojo.co.uk/post/how-far-can-you-get-with-ix-route-servers

#RPKI #DNSSEC #DNS #NTP #BGP

Fast auf den Tag 7 Jahre lang hängt (und funktioniert) meine #Arduino #NTP #Uhr schon im Wohnzimmer [https://www.commander1024.de/wordpress/2019/02/bau-der-analogen-uhr/]. Heute hat meine Tochter endlich die lasergravierten Zahlen angemalt, nachdem ich es die ganze Zeit lang nicht geschafft habe. Kinderarbeit ist doch was Tolles!

Fast auf den Tag 7 Jahre lang hängt (und funktioniert) meine #Arduino #NTP #Uhr schon im Wohnzimmer [https://www.commander1024.de/wordpress/2019/02/bau-der-analogen-uhr/]. Heute hat meine Tochter endlich die lasergravierten Zahlen angemalt, nachdem ich es die ganze Zeit lang nicht geschafft habe. Kinderarbeit ist doch was Tolles!

Recién vengo de saludar a los IT del CURE en Rocha por fin de año. Y en la coversa me desayuné que Pablo del CURE es el que gestiona los otros 3 servidores de tiempo NTP del NTPPool.org. Hay 4 servidores IPv4 en Uruguay, uno es Undernet y los otros 3 son de Pablo. No son Stratum 1 como Undernet, pero 2 corren en el CURE y el restante, en su otro trabajo. Así que era una reunión de administradores de servidores NTP de Uruguay de NTPPool.org. El pool es todito nuestro! ⏲️ ⏰ 🕜 ⌛ . En la terminal pueden hacer: host uy.pool.ntp.org y salen las 4 IPs y también nos fijamos y tenemos todos el mismo share, un 18% y algo... por lo que el balanceador reparte bastante parejo. Que chico que es Uruguay. #uruguay #ntppool #ntp #stratum1 #time #universaltime #utc

Since the US government is setting clocks back to the early 1940's, what are some recommended time servers that aren't dependent on the US?

#NoKings #NazisRaus #KickTheNazisOut #NTP #WhatTimeIsIt

GPS-gestützter Zeitserver mit Raspberry Pi: So baust Du Deine eigene Grandmaster Clock

Mit einem Raspberry Pi und einem GPS-Empfänger lässt sich ein präziser Stratum-1 Zeitserver aufbauen – inklusive PPS-Signal und PTP-Unterstützung. So entsteht eine kostengünstige Alternative zu teuren Grandmaster Clocks, die exakte Zeit im ganzen Netzwerk be

#chrony #Clock #gps #grandmaster #nmea #ntp #ntpd #pi #pps #rasbian #raspberry #zeitserver

https://dirkwouters.de/gps-gestuetzter-zeitserver-mit-raspberry-pi-so-baust-du-deine-eigene-grandmaster-clock/