Bad DNS Query for Date & Time

[Anne Wilson]

On Wednesday 31 Aug 2011 19:10:51 Michael D. Berger wrote:
> 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.
> 
I've investigated this further, since it intrigued me.  On my CentOS 6 box I 
installed wireshark, then set the time server to one of my local boxes.  
Wireshark shows attempts to connect, failing with "Destination unreachable 
(Host administratively prohibited) which I take to mean a firewall problem.  I 
shan't bother to correct that, as I wouldn't want that box to be the 
timeserver anyway :-)

At that point I reset the configuration to a pool timeserver and continued 
watching.  I see a number of SSDP packets between 192.168.0.1 and 
239.255.255.250 followed by negotiations between my ISP's preferred nameserver 
and an address that must be the timeserver, and a successful interchange.  At 
no point do I see anything like what you  have described, so that suggests to 
me that you have a configuration problem.

Incidentally, I don't have 'whois' at my disposal, and it's not contained in 
net-tools.  If you know where it is, please tell me.

Anne
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