On 7/1/20 9:02 PM, Bill Cole wrote:
On 1 Jul 2020, at 12:29, Istvan Prosinger wrote:
Fix the DNS? All reverse DNS should have an A record pointed back in the DNS
zone. This would be a real mess
It is quite common for one name to have multiple A (and/or AAAA) records and for more than one PTR record to point to
the same name. There is no reason to restrict DNS to a simplistic one-to-one relationship between IPs and hostnames.
Having one name resolve to multiple IPs is the most common mechanism used to load-balance email across multiple inbound
machines.
It is also formally valid to have multiple PTR records for one IP address, although some tools that try to use PTR
records will not know how to handle that and a larger fraction of the humans who see it will be confused.
It would be a mess. But I won't debate this with you here.
best,
Istvan
