On Tue, Mar 22, 2016 at 7:41 AM, Tony Finch <d...@dotat.at> wrote: > Marek Vavruša <mvavr...@cloudflare.com> wrote: > > > > there was an interest in reducing latency for address record lookups. > > Me and Olafur wrote a draft on adding AAAA records to A answers and > > treating them as authoritative. This fixes latency issues with NS > > A/AAAA discovery in resolvers and improves caching for clients (AAAA > > already cached by the time client comes asking for it). > > Regarding NS discovery, you should be aware that BIND queries for name > server A and AAAA concurrently. So this draft would just make packets > bigger without helping latency. >
It's worth noting that several "happy eyeballs" style APIs issue concurrent AAAA/A queries also, like the Apple connect-by-name APIs. Also getdns does this. AAAA and A go out back to back, put typically AAAA is put out on the wire first. -- Shumon Huque
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