forwarders order

[DEMBLANS Mathieu]

Hello,
Anyone know how forwarder is choosen when there is several configured ?
Threads about this subject I found talk about RTT but we doesn't observe these.
It looks more like a round robin.
I have tested the response time of the forwarders, our 2 locals servers respond in 2ms, the 2 others, that are remote, respond in 14ms but if I check the DNS traffic between the NS requested and the forwarders contacted I have a 26/26/23/23% repartition, 26% for remotes forwarders.
We use bind 9.18.24
Any idea about how it should work?

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