Bad DNS Query for Date & Time

[Anne Wilson]

On Wednesday 31 Aug 2011 Michael D. Berger wrote:
> On Wed, 31 Aug 2011 18:47:07 +0100, Anne Wilson wrote:
> > On Wednesday 31 Aug 2011 Michael D. Berger wrote:
> >> On Wed, 31 Aug 2011 13:53:59 +0100, Anne Wilson wrote:
> [...]
> 
> >> My original observation is in error as you will see.
> >> 
> >> Actually, I first edited /etc/ntp.conf to have use my local time server
> >> first, and then tock.usno.navy.mil. This time I had WireShark running
> >> when I first brought up System Settings > Computer Administration
> >> section > Date and Time.  Merely bringing it up results is a barrage of
> >> weird dns queries.  Two I saw this time is "settings-personal.desktop"
> >> and "settings-system.desktop". Is you might expect, dns responded "No
> >> such name". These things stop and then repeat every now and then. On
> >> the Date and Time gui, if I uncheck and recheck "Set date and time
> >> automatically" with my local url entered and selected, I do get a
> >> correct ntp transaction.
> >> 
> >> I now see that the odd dns activity is not specifically related to Date
> >> and Time, but occurs when I click and of various options.  Why is this?
> > 
> > Sheer blind guesswork - you are running a LAN, so packets will be
> > constantly being moved around the network, though switch or router.  My
> > guess, which might be totally wrong, is that you are seeing harmless
> > normal traffic.  As you say, it doesn't look as though it is connected
> > with the ntp query.
> > 
> > As for the 'uncheck and recheck' giving you a result - that's probably
> > because it checks on a schedule, and you re-started the schedule.
> > 
> > Anne
> 
> [...]
> 
> I looked on another box on the LAN, a CentOS 5, and I saw nothing
> like it.  I am guessing that it is a new feature of kde or something
> else in CentOS that is malfunctioning.  In a sense it is harmless, but
> creates useless noise on the net (it goes to outside dns servers)
> and replaces something that should be doing something.  I'll post
> on the CentOS list.
> 
Yes, there you will get advice from people more used to packet sniffing :-)  
I've done it, but not often enough to be really aware.

Anne
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