On 9 June 2015 at 14:53, Edward Lewis <edward.le...@icann.org> wrote:
> On 6/9/15, 7:42, "Mark Andrews" <ma...@isc.org> wrote: > ents that can be referenced > separately (like in RFP's and contracts). I found that trying to make > code prefer newer technologies over old by fiat seems to backfire (like > the way DNS used to prefer v6 over v4 and now seems to have reversed, > looking at some observed behavoral studies). > interesting this crops up, and in a thread with Mark. I am told he recently confirmed that there is no systematic deliberate biassing towards V4 in the code: its just shorter RTT selection. I wonder if there is a non-intentional bias against V6 eg the order the calls are made, or a lazy evaluated IF statement logic, because we see overwhelmingly more V4 than V6 on dual-stack NS with no cached state. -G
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