On Mon, Jun 25, 2018 at 7:02 AM, Tony Finch <d...@dotat.at> wrote: > > Even that though requires that the authoritative server be capable of > > waiting for an asynchronously retrieved value before it can respond. > > > > For some authoritative servers that might require a substantial redesign. > > That isn't required if the ANAME target records are fetched/updated by an > out-of-band provisioning process. A server will want to do it this way if > its query rate is bigger than the number of ANAME targetss divided by > their TTLs. >
A challenge with that is that many people now use geographic or latency based DNS routing based on the resolver IP address or EDNS-client-subnet. That's one of the reasons why Route53's ALIAS works only for targets that Route53 is authoritative for. -- Colm
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