Re: TTL From Parent or Child Zone?

I can't confirm it today because I am using Sprint and they intercept
and redirect all dns queries to their own strange servers but
nytimes.com had a configuration that increased the load on dns.  The
first time you queried for www.nytimes.com you find the addresses for
their name servers with a reasonable timeout but they are discarded
and replaced with info with very short ttl's by additional records
included with the answer for www.nytimes.com.
The result is each query has to go back to the root to find the NS. If
dnscache did not replace the authoritative answer with the additional
non-authoritative data, less load !

On Tue, Jun 2, 2009 at 10:58 AM, Darren Gamble<[email protected]> wrote:
> Hi Sabahattin,
>
>> authoritative and almost certainly has a very long TTL.  How can
>> example.net guarantee that the address record for bigbox.example.net,
>> as specified in the example.net zone files and as served by the
>> bigbox.example.net nameserver, will be seen by caches?
>>
>> Cheers,
>> Sabahattin
>
> In addition to the other helpful replies you've received, it should also
> be noted that dnscache will always update its cache with information
> received in the authoritative section of a DNS reply.
>
> So in practice, this may not be a concern for you since your cache will
> have the "child's" RRs as soon as the child serves a record...  assuming
> dnscache is the only cache looking at your data, of course.  Other cache
> servers' behavior may differ.
>
> ============================
> Darren Gamble
> Systems Architect, Regional Services
> Shaw Cablesystems GP
> 630 - 3rd Avenue SW
> Calgary, Alberta, Canada
> T2P 4L4
> (403) 781-4948
>
>