[ntp:questions] Re: uk pool problem

Danny Mayer mayer at ntp.isc.org
Thu Aug 31 02:38:30 UTC 2006


David J Taylor wrote:
> Danny Mayer wrote:
>> David J Taylor wrote:
>>> Danny Mayer wrote:
>>> Danny,
>>>
>>> The problem I am referring to is a DNS issue, not related to NTP,
>>> and it doesn't look to have been fixed yet:
>>>
>>> ------------------------------------------------------
>>> C:\>nslookup 0.uk.pool.ntp.org
>>> Server:  ns1-edi.blueyonder.net
>>> Address:  62.31.64.39
>>>
>>> *** ns1-edi.blueyonder.net can't find 0.uk.pool.ntp.org: Non-existent
>>> domain
>>>
>>> C:\>nslookup 1.uk.pool.ntp.org
>>> Server:  ns1-edi.blueyonder.net
>>> Address:  62.31.64.39
>>>
>>> *** ns1-edi.blueyonder.net can't find 1.uk.pool.ntp.org: Non-existent
>>> domain
>>>
>>> C:\>
>>> ------------------------------------------------------
>>>
>>> Something about the DNS records causes "normal" DNS servers to
>>> reject the updates - sorry but I don't know the exact details.
>>>
>>> Cheers,
>>> David
>> I don't think you understand how DNS operates. If you are getting
>> NXDOMAIN for this address, your DNS was unsuccessful in getting the
>> record and caches that fact for a certain length of time defined in
>> the TTL field of the SOA record of the domain. Once the time has
>> expired it will retry the query when asked for that address. You
>> might also want to turn off the "DNS Client" on your system as this
>> has similar bad effects.
>>
>> Danny
> 
> Thanks, Danny.
> 
> You are indeed correct that I have less understanding of precisely how DNS 
> operates than how NTP operates.  However, as I don't see this problem with 
> other NTP servers, just those from the pool, so I am forced to conclude 
> that it might be the way the pool operates compared to a more conventional 
> static DNS.
> 
> The pool operators are aware of this problem, I believe, and are 
> addressing it.
> 
> Cheers,
> David 

I would be able to supply expert advice to the pool operators if they
need it though I don't understand what issue it is that they are trying
to address.

Danny



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