query throtlling in bind9

Ladislav Vobr lvobr at ies.etisalat.ae
Tue Apr 13 10:09:23 UTC 2004


Can somebody shed some light on the way bind9 is retrying the 
nameservers, in case of all the nameservers are unreachable for 
particular domain.

Does it send for every single recursive request to this domain, several 
retries to each of servers all the time? (this I believe was bind8 
behavior, it sent for every recursive requests at least 3 retry packets 
to each of the servers again and again)

or

Does it send only single request to each of the nameservers, and after 
it times out it sends another one and again and again? (this would mean 
that the will be just one packet in 90 seconds to each of unreachable 
servers, regardless the traffic coming from the recursive clients be it 
hundreds such a requests per second for example)

or

does it slow down with the time? (understanding that there is no reason 
to retry with the same frequency, if the domain is down for let's say 
one year:-)...

thanks for any response

Ladislav




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