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Re: [dns-privacy] DNS + 0-RTT

Robert Edmonds <edmonds@mycre.ws> Mon, 11 April 2016 17:54 UTC

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Date: Mon, 11 Apr 2016 13:54:01 -0400
From: Robert Edmonds <edmonds@mycre.ws>
To: Shane Kerr <shane@time-travellers.org>
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Cc: "dns-privacy@ietf.org" <dns-privacy@ietf.org>, Colm MacCárthaigh <colm@allcosts.net>
Subject: Re: [dns-privacy] DNS + 0-RTT
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Shane Kerr wrote:
> Obviously a DNS server would prefer not to have to do the work of
> ordering queries. If you use cyclic order, then you have to maintain
> state about the last answer. If you randomize it, then you need some
> source of entropy.
> 
> I haven't done a full search, but here's a quick look at support.
> 
> On the authoritative side, BIND 9 of course offers any option (fixed
> order, round-robin, or ranomized), whereas NSD and I believe Knot are
> fixed.
> 
> On the recursive side, BIND 9 again offers any response, whereas
> Unbound is fixed (PowerDNS has a feature request for round-robin, but
> is currently also fixed (*)).

Unbound actually does support both fixed and randomized, and the entropy
is taken from an interesting place: the ID field from the query.

-- 
Robert Edmonds

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