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List:       dns-operations
Subject:    [dns-operations] Bailiwick stats? Idea for mitigation...
From:       vixie () isc ! org (Paul Vixie)
Date:       2008-08-11 3:07:07
Message-ID: 18433.1218424027 () nsa ! vix ! com
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> > Here's an observation... very likely load balancers will hash on  
> > some subset tuple of (src IP, dst IP, src port, dst port).
> 
> "Very likely" isn't really good enough.
> 
> The pool.ntp.org nameservers (for example) intentionally randomize  
> just about every request from a pool of more than 1500 IPs.

choosing an answer at random or even choosing the last answer, after
repeating the transaction several times, is not a painful workaround.
certainly it does not invalidate the 'repeat if QID comes in wrong'
approach.  so, the fact that answers won't be identical, we can live
with.

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