Re: recursive clients ? / quota

> Hi,
>
> As you know when the limit of 1000 (by default, or whatever you
> specify in named.conf) concurrent recursive clients is reached, you
> get the following messages in the log:
>
> Jun 30 08:53:11 xxxx named[5961]: client: warning: client
> 10.1.2.3#4015: no more recursive clients: quota reached
>
> I was wondering what is really seen as a "recursive client" by BIND:
>
> a) any queries as long as the "recursive" flag is set ? (even if it's
> a query for a hostname the server is authoritative for...? or in the
> cache?)

No.

> b) only recursive queries for which the server *has to* do the
> recursive job ?

Yes.

> c) anything else ?
>
> I am somehow confused that I have to set the value to 6000 to
> completly get rid of the "no more rec client quota reached"
> messages... even though the query rate is about 200-300 queries/sec
> and most of them are legitimate and internal ones (internal hostname)

It can take up to 90 seconds for a recursive query to fail

300*90 = 27000

~11 stalling queries a second will reach a quota of 1000.

> thanks
> YMJ
>
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews@isc.org