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Ntpdate output: Retro time syncronization




Here is the output of an ntpdate command, issued to pool.ntp.org. The purpose of doiing this is to understand the ntp protocol better, and see it as it functions today.

The intent of this post is just to publish the raw data; analysis is mostly deferred to comments or other threads. Nevertheless, a few points are immediately obvious.
* ntpdate polls very quickly. Unlike iburst, it is definitely, not just potentially, abusive by today's standards.
* The servers reached apparently diid block it, so I got only one or two samples from them.
* Ntpdate, unlike standard ntpd, uses all the server addresses returned by the dns lookup.


Quote:
$ ntpdate -dqv -p 8 pool.ntp.org
10 Jun 12:46:07 ntpdate[18111]: ntpdate 4.2.6p5@1.2349-o Thu Feb 11 18:28:58 UTC 2016 (1)
Looking for host pool.ntp.org and service ntp
host found : ns2.uplogon.com
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
receive(45.79.10.228)
transmit(67.18.187.111)
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
receive(67.18.187.111)
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
transmit(66.96.99.10)
receive(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
transmit(66.96.99.10)
receive(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
transmit(67.18.187.111)
receive(67.18.187.111)
transmit(66.96.99.10)
transmit(209.114.111.1)
transmit(45.79.10.228)
209.114.111.1: Server dropped: no data
server 66.96.99.10, port 123
stratum 2, precision -20, leap 00, trust 000
refid [66.96.99.10], delay 0.10579, dispersion 31.50156
transmitted 8, in filter 8
reference time: db056a33.8e22b6bb Fri, Jun 10 2016 12:32:51.555
originate timestamp: db056d5b.edc5def4 Fri, Jun 10 2016 12:46:19.928
transmit timestamp: db056d5d.e040231f Fri, Jun 10 2016 12:46:21.875
filter delay: 0.00000 0.00000 0.00000 0.00000
0.00000 0.10579 0.11491 0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
0.000000 0.011236 0.008133 0.000000
delay 0.10579, dispersion 31.50156
offset 0.011236

server 209.114.111.1, port 123
stratum 0, precision 0, leap 00, trust 000
refid [209.114.111.1], delay 0.00000, dispersion 64.00000
transmitted 8, in filter 8
reference time: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000
originate timestamp: 00000000.00000000 Thu, Feb 7 2036 1:28:16.000
transmit timestamp: db056d5e.1374eb12 Fri, Jun 10 2016 12:46:22.076
filter delay: 0.00000 0.00000 0.00000 0.00000
0.00000 0.00000 0.00000 0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
offset 0.000000

server 45.79.10.228, port 123
stratum 2, precision -22, leap 00, trust 000
refid [45.79.10.228], delay 0.06747, dispersion 63.50000
transmitted 8, in filter 8
reference time: db0568b6.34bf9012 Fri, Jun 10 2016 12:26:30.206
originate timestamp: db056d52.4db78314 Fri, Jun 10 2016 12:46:10.303
transmit timestamp: db056d5e.469d28da Fri, Jun 10 2016 12:46:22.275
filter delay: 0.00000 0.06747 0.00000 0.00000
0.00000 0.00000 0.00000 0.00000
filter offset: 0.000000 0.006582 0.000000 0.000000
0.000000 0.000000 0.000000 0.000000
delay 0.06747, dispersion 63.50000
offset 0.006582

server 67.18.187.111, port 123
stratum 2, precision -19, leap 00, trust 000
refid [67.18.187.111], delay 0.06528, dispersion 31.50041
transmitted 8, in filter 8
reference time: db0569f1.9d5c203d Fri, Jun 10 2016 12:31:45.614
originate timestamp: db056d5e.8053ecef Fri, Jun 10 2016 12:46:22.501
transmit timestamp: db056d5e.79dbb73e Fri, Jun 10 2016 12:46:22.476
filter delay: 0.00000 0.00000 0.06610 0.00000
0.00000 0.00000 0.00000 0.06528
filter offset: 0.000000 0.000000 0.006093 0.000000
0.000000 0.000000 0.000000 0.005261
delay 0.06528, dispersion 31.50041
offset 0.005261

10 Jun 12:46:24 ntpdate[18111]: adjust time server 67.18.187.111 offset 0.005261 sec




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