Strange recursor response time pattern

Matus UHLAR - fantomas uhlar at
Tue Sep 5 15:10:51 UTC 2017

On 05.09.17 16:44, Havard Eidnes wrote:
>It seems that every 10s, "on the clock", BIND will temporarily
>increase the query response time rather drastically for a short while,
>only to settle down to normal behaviour until the next 10s event.

>Any idea what might be causing this?  Anything I can do to remedy
>the behaviour?

BIND keeps track of servers it's sending queries to and their RTTs to prefer
sending queries to servers that respond more quickly.

ocasionally, it re-sends queries even to slower or unreachable servers to
see if the situation changed.

what you see may be result of this algorithm.
Matus UHLAR - fantomas, uhlar at ;
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Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
I just got lost in thought. It was unfamiliar territory. 

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