[ntp:questions] Re: Is my server performing correctly?

Richard B. Gilbert rgilbert88 at comcast.net
Tue Nov 23 01:06:11 UTC 2004


Evert Meulie wrote:

> Hi everyone!
>
> Is there someone out there who can verify that ntp.poboxes.info is up 
> and running and serving a somewhat correct time?   ;-)
>
>
> Regards,
>     Evert Meulie
>
>
> PS. Feel free to add this one to your servers list. It's 
> geographically located in Norway.

I tried it.  Here's what I did and what happened.

sunblok_$ ntpdate -d ntp.poboxes.info
22 Nov 19:46:23 ntpdate[17898]: ntpdate 4.2.0 at 1.1161-r Sat Jan 31 
23:23:54 EST 2004 (9)
Looking for host ntp.poboxes.info and service ntp
host found : ti231210a080-2145.bb.online.no
transmit(80.213.120.99)
receive(80.213.120.99)
transmit(80.213.120.99)
receive(80.213.120.99)
transmit(80.213.120.99)
receive(80.213.120.99)
transmit(80.213.120.99)
receive(80.213.120.99)
transmit(80.213.120.99)
server 80.213.120.99, port 123
stratum 3, precision -20, leap 00, trust 000
refid [80.213.120.99], delay 0.13968, dispersion 0.00047
transmitted 4, in filter 4
reference time:    c54d0467.4a13d31b  Mon, Nov 22 2004 19:35:51.289
originate timestamp: c54d06e2.79355475  Mon, Nov 22 2004 19:46:26.473
transmit timestamp:  c54d06e2.7089aeae  Mon, Nov 22 2004 19:46:26.439
filter delay:  0.14293  0.14024  0.13968  0.14023
         0.00000  0.00000  0.00000  0.00000
filter offset: -0.02290 -0.02408 -0.02412 -0.02347
         0.000000 0.000000 0.000000 0.000000
delay 0.13968, dispersion 0.00047
offset -0.024128

22 Nov 19:46:26 ntpdate[17898]: adjust time server 80.213.120.99 offset 
-0.024128 sec

Sunblok is actually about 2 microseconds offset from my GPS reference 
clock.  I'd say that the large correction ntpdate would have applied is 
due to what appears to be a 140 millisecond round trip delay.  Virtually 
all the servers that I use are 125 milliseconds closer than that.

Please note that I'm not suggesting that your server is off by 24 
milliseconds; I think its impossible to determine the time accurately 
over such a distance (traceroute counted 31 hops between my server and 
yours)!!



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