[time-nuts] Re: NIST NTP servers way off for anyone else?

[alec at unifiedmathematics.com]

I've seen SO_TIMESTAMP and friends in ethtool but I have no idea what it 
is or how it works, can you point me in the right direction please?

Alec

---


On 2021-12-14 18:12, Steven Sommars wrote:
> On Tue, Dec 14, 2021 at 11:40 AM Michael Rothwell <michael at rothwell.us>
> wrote:
> 
>> I see some high offsets on my local monitoring (synced to 
>> time.google.com
>> ).
>> Especially time-e-b on ipv6.
>> 
> 
> This observation is correct and is caused by queuing delay on the NIST
> server.  NIST NTP mode 3 requests
> are apparently time-stamped at application level, rather than using
> SO_TIMESTAMP or related techniques.
> As an exercise, compare the NTP (UDP port 123) and TIME (UDP port 37)
> delays.
> 
> Steve Sommars
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