John, "log-only yes;"
is the reason you are not seeing any rate limiting. You are telling your
server not to actually do any rate limiting, just to log what it would have
done. You didn’t post any more of your named.conf, but I would assume you
don’t have any logging set up for rate limiting, so you don’t see any of that
either.
You need a rate-limit log stanza to see rate limiting information (rate
limiting from IP address, no longer limiting from IP address, etc), and the
individual queries that are not responded to are logged either in your querylog
or query-errors (can’t remember which off the top of my head).
-Rich
On Jan 17, 2014, at 7:34 AM, John Horne <john.ho...@plymouth.ac.uk> wrote:
> Hello,
>
> I have BIND 9.9.4 installed on a server, and have included in the global
> options:
>
> rate-limit { responses-per-second 5;
> log-only yes;
> };
>
> However, if I run from a client:
>
> for n in `seq 1 10`; do dig +short jhorne.csd.plymouth.ac.uk a
> @141.163.66.138; done
>
> I get 10 correct responses. The query log file on the server shows that 10
> queries were received:
>
> 17-Jan-2014 13:20:43.662 client 141.163.66.139#55184
> (jhorne.csd.plymouth.ac.uk): view plymouth-only: query:
> jhorne.csd.plymouth.ac.uk IN A + (141.163.66.138)
>
> (The other 9 log entries are the same, except for the milliseconds increasing
> slightly.)
>
> It's Friday afternoon, so I'm probably missing something obvious :-) I cannot
> see why all the queries were responded to, I expected some queries to timeout
> and something to be logged (none of the other bind logs contain anything
> about rate limiting).
>
>
>
> Thanks,
>
> John.
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