automatic reverse and forwarding zones

[Fred Morris]

"Garbage" records...

On Mon, 7 Nov 2022, Matus UHLAR - fantomas wrote:
> On 07.11.22 15:42, Petr Špaček wrote:
>> That's part of normal resolver operation: Garbage in - garbage out - 
>> garbage eventually cleaned out from cache. There is nothing special about 
>> PTR records in that regard.
>
> sooner or later, but filling up cache with garbage could result in other 
> non-garbage records being flushed out. 
> Are there any mechanisms that would wipe this garbage before other records, 
> used more often even if not very recently?

The only reason you get records in cache is because you requested them. 
>From my vantage most PTR records are demonstrably garbage.

Caching exists because if you requested it once you might request it 
again. Who knows, maybe you didn't believe it the first time. In any case, 
that's why the aphorism "garbage in garbage out" is a thing.

--

Fred Morris