Re: [chrony-users] Interop with NTP version 1 and 4 clients

[Bill Unruh <unruh@xxxxxxxxxxxxxx>]

On Tue, 19 Feb 2013, Benny Lyne Amorsen wrote:

> Chrony is working very well as an NTP server (not a stratum 1 of

Chrony works perfectly well as a stratum 1-- just use refclock of say a gps
pps source. 
What version of chrony are you using?


> course). However, certain client requests get no answer and others get a
> surprising one.
>
> Some clients use the SNTP protocol, which I believe is also known as NTP
> version 1? Those clients do not receive an answer at all. This is
> unfortunate since they are SIP phones and have no other way of acquiring
> time.

No idea about this. As far as I know sntp uses exactly the same packets as
does full ntpd. get a better app.


> Here is the tcpdump of a client indicating NTPv4 but receiving an NTPv3
> answer. The client then proceeds to ignore that answer and repeats the
> question.

What software is being used by the client?
ntp4 system should accept and ntp3 response, so something is wrong at the
client end.


> 15:03:55.712716 IP (tos 0x0, ttl 59, id 0, offset 0, flags [DF], proto UDP (17), length 76)
>    x.x.x.x.1011 > y.y.y.y.ntp: NTPv4, length 48
> 	Client, Leap indicator:  (0), Stratum 0 (unspecified), poll 0s, precision 0
> 	Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID: (unspec)
> 	  Reference Timestamp:  0.000000000
> 	  Originator Timestamp: 0.000000000
> 	  Receive Timestamp:    0.000000000
> 	  Transmit Timestamp:   3570271435.694462001 (2013/02/19 15:03:55)
> 	    Originator - Receive Timestamp:  0.000000000
> 	    Originator - Transmit Timestamp: 3570271435.694462001 (2013/02/19 15:03:55)
> 15:03:55.712877 IP (tos 0x0, ttl 64, id 0, offset 0, flags [DF], proto UDP (17), length 76)
>    y.y.y.y.ntp > x.x.x.x.1011: NTPv3, length 48
> 	Server, Leap indicator:  (0), Stratum 4 (secondary reference), poll 0s, precision -19
> 	Root Delay: 0.009262, Root dispersion: 0.019210, Reference-ID: 217.195.186.210
> 	  Reference Timestamp:  3570271416.234727978 (2013/02/19 15:03:36)
> 	  Originator Timestamp: 3570271435.694462001 (2013/02/19 15:03:55)
> 	  Receive Timestamp:    3570271435.712715923 (2013/02/19 15:03:55)
> 	  Transmit Timestamp:   3570271435.712865889 (2013/02/19 15:03:55)
> 	    Originator - Receive Timestamp:  +0.018253916
> 	    Originator - Transmit Timestamp: +0.018403917
>
>
> By the way, what happened to the gmane mailing list subscription? The last mail on gmane is from 2009...
>
>
> Thanks for a great piece of software!

Thank Richard Curnoe who invented and wrote chrony, and Miroslav Lichvar who
took over when life got too busy for Curnoe and has added a bunch of features
(including handling refclocks)
I agree it is a great piece of software.

> /Benny

--
William G. Unruh   |  Canadian Institute for|     Tel: +1(604)822-3273
Physics&Astronomy  |     Advanced Research  |     Fax: +1(604)822-5324
UBC, Vancouver,BC  |   Program in Cosmology |     unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1     |      and Gravity       |  www.theory.physics.ubc.ca/

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