[ECOS] Limitations with the SNTP client?

Andre-John Mas ajmas@sympatico.ca
Thu Nov 2 21:39:00 GMT 2006


Written by: Andrew Lunn <andrew@lunn.ch>
> 
> On Thu, Nov 02, 2006 at 11:48:43AM -0500, Andre-John Mas wrote:
> > Hi,
> > 
> > We have found the SNTP client can get the time from some servers but
> > not others. For example we have a Linux based SNTP server from which
> > we can get the time, but not from the SNTP server running on our
> > Solaris machines. Are there any known limitations with the client
> > implementation. 
> > 
> > I am currently checking to see if it is a server configuration issue,
> > but I would like a confirmation as to the client to see whether I am
> > spending my time in the right place.
> 
> I only ever tested it with a i386 Linux box
> 
> I suppose it could be an endian issue. I'm assuming you have a Sparc
> Solaris machine and not an i386? 
> 
> The other possibility is that your Solaris machine does not support
> version 3 or 4 of SNTP?
> 
>         Andrew
> 

Using the Java client from:

   http://ntp.isc.org/bin/view/Support/JavaSntpClient

I got the following responses:

NTP server: testsys2
Leap indicator: 0
Version: 3
Mode: 4
Stratum: 4
Poll: 4
Precision: -17 (7.6E-6 seconds)
Root delay: 0.00 ms
Root dispersion: 10.50 ms
Reference identifier: 127.127.1.0
Reference timestamp: 02-Nov-2006 12:14:21.970141
Originate timestamp: 02-Nov-2006 12:06:12.887000
Receive timestamp:   02-Nov-2006 12:15:04.371634
Transmit timestamp:  02-Nov-2006 12:15:04.371800
Dest. timestamp:     02-Nov-2006 12:06:12.887000
Round-trip delay: -0.17 ms
Local clock offset: 531484.72 ms

NTP server: 10.1.4.15
Leap indicator: 0
Version: 3
Mode: 4
Stratum: 3
Poll: 4
Precision: -16 (1.5E-5 seconds)
Root delay: 63.22 ms
Root dispersion: 80.69 ms
Reference identifier: 63.111.165.21
Reference timestamp: 02-Nov-2006 12:01:40.517556
Originate timestamp: 02-Nov-2006 12:12:21.394000
Receive timestamp:   02-Nov-2006 12:12:21.325495
Transmit timestamp:  02-Nov-2006 12:12:21.325661
Dest. timestamp:     02-Nov-2006 12:12:21.394000
Round-trip delay: -0.17 ms
Local clock offset: -68.42 ms


NTP server: wiki
Leap indicator: 0
Version: 3
Mode: 4
Stratum: 3
Poll: 0
Precision: -20 (9.5E-7 seconds)
Root delay: 119.17 ms
Root dispersion: 71.33 ms
Reference identifier: 146.48.83.182
Reference timestamp: 02-Nov-2006 12:04:26.587828
Originate timestamp: 02-Nov-2006 12:05:23.780000
Receive timestamp:   02-Nov-2006 12:05:23.705543
Transmit timestamp:  02-Nov-2006 12:05:23.705565
Dest. timestamp:     02-Nov-2006 12:05:23.780000
Round-trip delay: -0.02 ms
Local clock offset: -74.45 ms

Only the last one seems to work with the SNTP implementation in
eCos. Is there anything in there that raises any flags?

Andre 


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