BIND 9.4.x and max-clients-per-query
Jan Arild Lindstrøm
jal at telenor.net
Thu Sep 25 05:43:32 UTC 2008
At 01:16 25/09/2008, JINMEI Tatuya / =?ISO-2022-JP?B?GyRCP0BMQEMjOkgbKEI=?= wrote:
>At Mon, 22 Sep 2008 07:24:02 +0100,
>Jan Arild Lindstrøm <jal at telenor.net> wrote:
>
>> >Second, limiting max-clients-per-query doesn't help reduce the number
>> >of recursive clients if the same query is sent from different IP
>> >addresses.
>>
>> Auch! Is that really correct? Should it not then be called "max-queries-per-client" and
>> not "max-clients-per-query"?
>
>Oops, I was wrong. I was confused about the case where a single (or
>multiple) client keeps sending a high volume of different bogus
>queries (for which max-clients-per-query doesn't help).
>
>I now see the problem. It's really strange to have more than 10,000
>recursive clients for the same query while max-clients-per-query is
>100. I have no specific idea about how this could happen, but I'd
>suspect this may be a thread-related bug. Is it possible to rebuild
>named without threads and see if the same problem happens?
I do not know if our T2000 will manage to reply fast enough, or if it fast will get saturated
if it uses only one thread for alle the traffic. I will rebuild and test a little in parrallell on one
of them.
Regards
Jan Arild Lindstrom
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