slow non-cached quries

[TMK]

On Tue, Sep 6, 2011 at 6:13 PM, TMK <engtmk at gmail.com> wrote:
> On Sat, Sep 3, 2011 at 2:06 PM, TMK <engtmk at gmail.com> wrote:
>>
>>> Message: 1
>>> Date: Fri, 2 Sep 2011 10:05:42 +0200
>>
>>> From: TMK <engtmk at gmail.com>
>>> Subject: Re: Fwd: Re: slow non-cached quries
>>> To: bind-users at lists.isc.org
>>> Message-ID:
>>>
>>>  <CAAKgOtgCoQdSZ2FJC8Y3kL+bj1gUabSB0ohoxnu+DgT8fyF0Hg at mail.gmail.com>
>>> Content-Type: text/plain; charset="iso-8859-1"
>>>
>>> On Sep 2, 2011 9:48 AM, "TMK" <engtmk at gmail.com> wrote:
>>> >
>>> > ---------- Forwarded message ----------
>>> > From: "Leonard Mills" <lenm at yahoo.com>
>>> > Date: Aug 31, 2011 8:15 PM
>>> > Subject: Re: slow non-cached quries
>>> > To: "TMK" <engtmk at gmail.com>
>>> >
>>> > ;; Received 738 bytes from 192.112.36.4#53(G.ROOT-SERVERS.NET) in 3133
>>> > ms
>>> >
>>> > That pretty much is your delay.  Look to your intermediate network
>>> segments, especially any smart devices.
>>> >
>>> >> ________________________________
>>> >> From: TMK <engtmk at gmail.com>
>>> >> To: Mark Andrews <marka at isc.org>
>>> >> Cc: bind-users at isc.org
>>> >> Sent: Wednesday, August 31, 2011 4:44 AM
>>> >> Subject: Re: slow non-cached quries
>>> >>
>>> >> On Tue, Aug 30, 2011 at 9:26 AM, TMK <engtmk at gmail.com> wrote:
>>> >>
>>> >>
>> Actually we have around 6 servers. All I need to do is to reduce the
>> response time for the uncached responses as much as possible. So will the
>> master cache server save maybe 200 sec of the response time which is good
>> number is there any other way to force my server to contact gtld servers
>> closer to its geoloc in Africa to reduce the round trip times is that
>> possible
>
> one of the worst responses time we captured on our network was for
> domain : a.root-servers.net (this is represent 5% of our dns traffic).
> we got response time up to 30 sec.
>
> I know this queries can be generated by viruses. but I need to know:
>
> why the bind responding so slowly to such domain > 30 sec and if there
> is way to reduce such time.(even if it is query from a virus)
>
> Regards,
>

Dears,

any recommendation would be much appreciated.

Regards,