#ntp — Public Fediverse posts

RS485 over RJ45, and a local regulator, and all seems to work (once I get the RS485 polarity right, FFS). #GPS #NTP. So next batch will use an RJ45 patch lead.

Is the "timey wimey" too much?

#PCB #NTP #GPS #ESP32 #DrWho

Przygotowuję sobie materiały na jutro - na szkoleniu pokażę, jak skonfigurować stację #Linux by był serwerem #NTP

We have been working on adding a piezo beeper to the #GPS #NTP clock...

Existing boards can solder one to GPIO 0 pad - next board will have one on the PCB.

Two settings...

1. Click (DC toggle) per request - allowing obvious indication of storm/attack.
2. Greenwich pips on the hour (option to do on minute with debug set). It turns off clicks a second before and back on a second after.

I have NOT done the 7 pip leap second yet. I expect not needed to be honest.

[UPDATE: I added leap seconds]

Thanks to Dave for a comprehensive report on my #GPS #NTP time servers in the NTP pool.

https://codeberg.org/RevK/ESP32-GPSNTP/src/branch/main/RevK%20NTP%20Server%20Notes%2012th%20August%202026.pdf

P.S. Wow, and this is on and ADSL line! But it is an @aaisp ADSL line, so that helps.

https://shop.revk.uk

Hey Canadians, do you know what time it is?

https://nrc.canada.ca/en/web-clock/

#Canada #Time #Clock #NTP #NRCC

So, apparently two issues impact #NTP servers.

One is idiot vendors that all request at the same time, so a massive burst of requests. This needs sorting by poking vendor with a large stick. Shame NTP has no "vendor ID" in request.

Two is reflection attacks. They are minimal, why not direct attacks if you can? But they happen. So an NTP server can help by limiting replies.

I am working on that now - a hash of source IP, cleared each second, but limiting a second request from same source hash.

Finally back in stock #GPS #NTP

https://lectronz.com/products/gps-ntp-server

[Thank you for the orders that just came in]

This is somewhat experimental...

I currently have my #GPS #NTP in two parts, GPS is an L86 connected by 5 core wire to main PCB using WAGO connections.

My next step, still an L86, is connected using cat5 cable and RJ45 sockets, much easier.

Also, power is now 12V, and regulator on the L86 board. This is the bit I am concerned over in case switch mode regulator upsets GPS. We'll see.

Signals are RS485 on the remaining cat5 pairs.

(more GPS/NTP on https://shop.revk.uk probably next week)

Alguien ha usado el mirror de Debian? Las estadísticas del mirror son muy buenas, tenemos el máximo puntaje. Lo mismo con el servidor NTP Stratum 1, también tenemos el máximo puntaje y estamos respondiendo el 20% de las consultas NTP de Uruguay para ntppool.org #ntp #debian #mirror #time #undernet #uruguay

Having sold all 20 #ESP32 #GPS #NTP modules, I expect 20 more next week, but see 13 people already on #Lectronz waitlist.

I've been doing some updates to the code today for the unlikely event of another leap second, just in case.

I think that is it for the code now, I can't think what else to add.

I was thinking of adding NMI assembler for PPS interrupt, but normal interrupt and clever code to pick best recent reference gives as low as σ=2ns for reference timestamps for NTP. Mad!

И еще немного извращений из мира прокси и VPN

Жизнь диссидента-экспериментатора не сидит на месте, а копилка безумных находок пополняется быстрее, чем успеваешь про них написать. Продолжаем то, на чем остановились в прошлый раз - туннели через ICMP, DNS и serverless-функции это, конечно, хорошо, но вот вам еще три свежие находки: туннель через что угодно, что умеет хранить файлы, туннель через почтовый ящик, и реанимация древней технологии обхода через CDN и не только, которую почему-то все забыли.

https://habr.com/ru/articles/1065064/

#meek #imap #ntp #s3 #webdav #ftp #прокси #vpn #туннели #cdn

The Eye of Sauron is upon one of my US #NTP Pool servers.

Some IP—of course, it's UDP, so it could be spoofed—has been sending me 5 megabits (~8075 pps) for over a day.

It's a VPS, 7000 interrupts per second use quite a lot of CPU!

(I blocked it, it's fine, probably.)

There's a "normal" level of NTP abuse (e.g., 1 packet every 4 seconds, could be a large network using NAT) and then occasionally you get the firehose.

This sounds like an anti-advertisement, but I encourage people to run NTP servers! :blobtongue: It's a critical public service and it's almost never a headache. Your network does need to be able to handle some packets/flows per second, though.

OK, most issues solved, just sorting MD5 on NTPv4 packets.

First image is on a lightly loaded FB2900, second on a busy FB9000, from same two new time servers on LAN.

More on my blog https://www.revk.uk/2026/07/time-for-something-new.html

#GPS #NTP #ESP32

I now have my hand coded Ethernet doing ARP and ND and basic NTP IPv4/6 with around 0.1ms response times.

Next step is higher priority PPS interrupt and cutting down jitter.

My aim is challenging LeoNTP performance, but not sure I've quite managed that. Getting very close.

More to do, if you have one of these from me there will be several s/w updates.

#GPS #NTP #ESP32

Wow, this is fun.

The #GPS #NTP system is doing well - I have hand coded interrupt based Ethernet driver with way simpler coding.

Little things like proper drivers "set bits" or "clear bits" that are read/write, as SPI transactions. I know what I wrote and so can do as one.

But even more than that with setting read packet and send packet as a single thing without several intervening SPI transactions.

Response time 0.105ms now. Irony is via two extra switches is 0.115ms and not selected.

And, as expected, already running low on GPS NTP server stock.

I think I'll have to order more.

Still working on improving performance. But currently working very well.

https://lectronz.com/products/gps-ntp-server

#GPS #NTP #ESP32

Local stratum 1 GPS NTP time server, yay!

Now to see how it copes with sun and rain. The bag is an extra precaution. Tracking 36 satellites and using 19, over three networks.

Current PPS tracking with σ=16ns

Current jitter measured at FireBrick (NTP client) of 0.08ms, and latency of 0.7ms. Selected over any pool (via Internet) servers, understandably.

PoE

#PCB #ESP32 #GPS #NTP

Oh DHL, I have no clue what country my parcel is in now.

Also, why is 19:19 (UTC +02:00) shown before the later time 19:12 (UTC +01:00)

The board has been cursed.

But at least the software is ready, and now working well...

#GPS #NTP #PCB will be listed on the shop soon.

it's not NTP.

There's no way it was NTP.

It was NTP.

https://www.theregister.com/networks/2026/07/17/ntp-server-that-traveled-back-in-time-caused-massive-aussie-mobile-outage/5274059

#Telstra #NTP

Earth Rotation Records Spur October Vote to Avert Negative Leap Second

"Negative leap second risk is driving an October 2026 CGPM vote to replace the 54-year-old leap second with a leap hour. Earth set rotation speed records in 2024 and 2025."

Link: https://www.techtimes.com/articles/320185/20260711/earth-rotation-records-spur-october-vote-avert-negative-leap-second.htm

#linkdump #engineering #gps #ntp #time

“The issue was therefore not simply the loss of one NTP #server or #redundancy in the #design of the #configuration of the three #NTP servers, but the propagation and acceptance of erroneous #date information by #interconnected #systems that rely on timing as a #trust and ordering #reference.”

Q Who said this first?

#LeslieLamport or some #Telstra exec? <https://www.theguardian.com/business/2026/jul/17/telstra-missing-software-update-undocumented-design-change-outage>

topical for Australian folks ...

#ntp #telstra #telstraOutage

https://www.youtube.com/watch?v=1T9xQy-dsQo

Telstra CEO ‘deeply sorry’ for outage and admits risk of time-keeping failure was known

https://www.theguardian.com/business/2026/jul/10/telstra-ceo-deeply-sorry-for-outage-and-admits-risk-of-time-keeping-failure-was-known-ntwnfb

> Vicki Brady grilled at first public appearance since returning from overseas while minister Anika Wells says it is ‘time for Telstra to face the music’

#tech #business #ntp

Learn how Network Time Protocol (NTP) works, why accurate time matters, how NTP calculates clock offset and network delay using four timestamps.

Full guide here: https://ostechnix.com/how-network-time-protocol-ntp-works/

#NetworkTimeProtocol #NTP #TimeSynchronization #ClockSynchronization #DistributedSystems #Networking #Linux #Windows

“Swinburne University #Professor #AllisonKealy, an expert in #positioning, #navigation and #timing, told the ABC she had raised this exact scenario when she approached Telstra earlier this year while seeking support for a proposed critical #infrastructure #resilience #research centre.

Professor Kealy said the pitch to #telcos and other critical infrastructure operators was that they needed to identify shared points of failure before an outage exposed them.”

"We have been approaching all the critical infrastructure sectors to tell them, we have to act now,"

Priorities set by Business leaders and Politicians

VS

Academics and Engineers.

#NTP / #GPS / #telecommunications / #Swinny / #SwinburneUniversity <https://abc.net.au/news/2026-07-10/telstra-warned-about-vulnerability-before-national-outage/106896906>

Es ist ja immer was: Wenn ich unter FRITZ!OS v8.25 die NTP-Funktion deaktiviere und auf „Übernehmen“ klicke, crasht der Router. 🤔

#NTP #FritzOS #Router