Re: NTP Sync Issue Across Tata (Europe)

The recommendation tends to be the following: 1) Run your GPS-derived NTP appliances, but DO NOT point end-user clients at it. 2) Run a set of internal NTPd servers, and configure them to pull time from all of your GPS-derived NTP servers, AND trusted public NTP servers 3) Point your clients at

Re: NTP Sync Issue Across Tata (Europe)

Let me address your points: First, the spoofing does mess with the timing stream. To not mess with the timing stream, the entity doing the spoofing would have to have high-quality NTP-synchronized clocks and somehow generate the GPS I-Q data such that it was perfectly synchronized with

Re: NTP Sync Issue Across Tata (Europe)

Seth, My point exactly. Use GPS as primary, and have anti-PS back up, and if you want automatic fail over, do that in an intermediate server on your site that makes a conscious test and decision to fail over to regular NTP -mel via cell > On Aug 9, 2023, at 5:01 PM, Seth Mattinen via NANOG

Re: NTP Sync Issue Across Tata (Europe)

On 8/9/23 3:25 PM, Forrest Christian (List Account) wrote: Note that NIST operates a pool of 24 time servers for public use.  These are spread across four different locations in two different states.  My understanding is that they all get their time directly from the official NIST clocks

Re: NTP Sync Issue Across Tata (Europe)

Note that NIST operates a pool of 24 time servers for public use. These are spread across four different locations in two different states. My understanding is that they all get their time directly from the official NIST clocks without GPS or NTP being involved. You can also request a

Re: Changes to ARIN Online - Routing Security Dashboard - RPKI & IRR integration (was: Fwd: [arin-announce] New Features Added to ARIN Online)

NANOGers - As alluded to by Mark Kosters in his message below, we are placing on hold the functionality for the automatic creation of corresponding new route objects for RPKI validated ROAs that lack such. This is being done out of an abundance of caution in order to allow us to conduct a

Re: Changes to ARIN Online - Routing Security Dashboard - RPKI & IRR integration (was: Fwd: [arin-announce] New Features Added to ARIN Online)

Responses inline starting with "MK:" On 8/9/23, 10:21 AM, "NANOG on behalf of Jay Borkenhagen" mailto:arin@nanog.org> on behalf of j...@braeburn.org > wrote: I agree that in ARIN's RPKI-->IRR synthesis, the set of route[6] objects created should not depend on the

Re: NTP Sync Issue Across Tata (Europe)

While GPS spoofing is technically possible, all the extant spoofing only tampers with the ephemeris (satellite position) data, not the timing stream. That's because hackers have been aiming at navigation, and may not have expressed interest in GPS tampering when NTP tampering is so easy  To

Re: NTP Sync Issue Across Tata (Europe)

Once upon a time, Jay Hennigan said: > Both GPS and WWVB are over-the-air. There has been concern expressed > of a bad actor spoofing or jamming GPS. Comparatively speaking, > jamming or spoofing WWVB is a trivial joke. WWVB is not generally useful for precision timing applications, due to the

Re: NTP Sync Issue Across Tata (Europe)

On 8/9/23 09:29, Seth Mattinen via NANOG wrote: I liked having a WWVB receiver in my mix, but all the hardware appliances (at least those offering OCXO or Rubidium oscillator options) seem to have rejected it in favor of GPS only. I can only conclude that either vendors think options like

Re: Last Mile ISP Quality Measurements

Would a QoE product be able to show me that my connectivity to Slack sucks right now? I've followed precinct for a long time, with Libre qos a bit less than that. I took it as ISP subscriber focused, not greater internet focused. - Mike Hammett Intelligent Computing Solutions

Re: Last Mile ISP Quality Measurements

I have a probe, but not an anchor. That would just help with simple reachability issues to probes that test against it, wouldn't it? It wouldn't necessarily be able to monitor popular Internet destinations or across different peers? - Mike Hammett Intelligent Computing Solutions

[NANOG-announce] VIDEO - NANOG Talks to Seattle Community Network + Guest Column: Geoff Huston

*VIDEO - NANOG Talks to Seattle Community Network* *NANOG Talks to SCN About Connecting the Underserved Across Puget Sound* *The Seattle Community Network (SCN) is an Internet built by the community for the community.* NANOG Executive Director Edward McNair sat down with a volunteer of SCN +

VIDEO - NANOG Talks to Seattle Community Network + Guest Column: Geoff Huston

*VIDEO - NANOG Talks to Seattle Community Network* *NANOG Talks to SCN About Connecting the Underserved Across Puget Sound* *The Seattle Community Network (SCN) is an Internet built by the community for the community.* NANOG Executive Director Edward McNair sat down with a volunteer of SCN +

Re: NTP Sync Issue Across Tata (Europe)

On 8/9/23 2:39 AM, Forrest Christian (List Account) wrote: When GPS is working, time transmission with accuracies of under 1 microsecond is common.   This is especially true if the GPS integrates some sort of disciplined oscillator.  Note that this is in excess of what NTPd running on a

Re: Changes to ARIN Online - Routing Security Dashboard - RPKI & IRR integration (was: Fwd: [arin-announce] New Features Added to ARIN Online)

Job Snijders via NANOG writes: > > > > > Would it not be advantageous to create at a minimum the 256 of the > > > 'least-specific' objects? > > > > MK: That may be a reasonable approach. Do you see any adverse effects > > in simplifying the IRR Route creation logic to just have > >

Re: Last Mile ISP Quality Measurements

> > measure the quality of their connections Really depends on what you are trying to measure. Some metrics are going to be great at telling you the quality and performance of the network at L3, but thanks to the Stupid Content Provider Tricks that we use, won't tell you anything about the L4/L7

Re: Last Mile ISP Quality Measurements

I am reluctant to respond because it might end up sounding like an ad for libreqos.io. Leaving aside the tcp rtt tracking, the cake shaping, the mark and drop statistics in that product, the (mostly wireless) ISPs we work with typically have a dashboard of long term SNMP statistics of key

Re: Last Mile ISP Quality Measurements

Have you considered hosting a Ripe Anchor? https://atlas.ripe.net/anchors/about/ Minimal cost, good of the Internet project, good insights, answers the use case you describe. Steve P

Re: NTP Sync Issue Across Tata (Europe)

John Gilmore wrote: I was also speaking specifically about installing GPS antennas in viable places, not using a facility-provided GPS or NTP service. Am I confused? Getting the time over a multi-gigabit Internet from a national time standard agency such as NIST (or your local

Re: NTP Sync Issue Across Tata (Europe)

When GPS is working, time transmission with accuracies of under 1 microsecond is common. This is especially true if the GPS integrates some sort of disciplined oscillator. Note that this is in excess of what NTPd running on a typical OS can reliably retransmit. BUT.. if I was to choose only

Re: Last Mile ISP Quality Measurements

I would personally have end IT friendly mimick and test their existing systems on the nee ISP. Especially cloud tech having read a book on cloud by some PHD administrators they redefined  cloud as being cloudy in a sense to do with not knowing what route your clients packets will take to

Looking for a Telus cellular last mile facilities operations contact

I have observed a Telus cellular site shelter that's making a terrible, not normal ventilation noise. It's a 12+ foot length prefab assemble on site shelter located in the basement parking garage of a 23 floor tower in downtown Vancouver. I know what this POP's normal ventilation sounds like,