On 2020-06-18 4:37 a.m., Benoît Panizzon via mailop wrote:
Allow your customers to set an additional PTR.
AFAIK only one PTR per RR is allowed, even if most DNS allow to set
multiple ones.
And when you say 'only one PTR per RR' is "allowed", could you explain
that further? "allowed" by whom, or what policy.
Multiple PTR's do have a legitimate reason sometimes, albeit nothing
worse than the operator who has 40-50 PTR records, this is not
efficient, for DNS queries..
DNS Round Robin is still a common thing, where systems may share a name
in the PTR's but also have a unique name..
Other reasons for multiple PTR's still do exist, eg transitioning from
one naming convention to another, so systems should be designed to
'walk' the PTR records, and 'A' records, when doing 'match' validation.
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