Am 14. November 2021 01:29:06 MEZ schrieb Sadiq Saif <li...@sadiqsaif.com>:
>Hi all,
>
>While doing some checks on records in my zones I noticed that two public
>resolvers limit maximum TTL values. Google Public DNS limits to six hours and
>Quad9 limits to twelve hours. I tested this with a freshly created A record to
>forgo the possibility of caching. The actual TTL of the record at the
>authoritative servers is twenty four hours.
>
>What is the technical or other reason(s) for such TTL limiting?
>
I suspect the resolvers operators want to reduce the impact of wrong RRs. Not
every zone operator thinks about reducing the TTLs before changes. It is a
compromise.
Winfried
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