Why two lookups for a CNAME?

[Phil Mayers]

On 22/10/15 16:37, Reindl Harald wrote:

> since in a normal environment that don't matter consider in case of a
> caching-only nameserver in such an environment using unbound instead of
> named because it supports "cache-min-ttl" which is also strongly
> recommended on a inbound mailserver using RBL's
>
> cache-min-ttl: 600
> cache-max-ttl: 10800

Right, but he'll still see a slow, expired-cache case every min-ttl 
won't he? Unless unbound does prefetch?