Re: BIND 9.21+/9.22: parent-centric delegations and no TTL-based cleaning

Michael Richardson <[email protected]> Wed, 15 Apr 2026 12:38:42 -0400

Newsgroups	gmane.network.dns.bind9.user
Message-ID	<7100.1776271122__19789.6332758077$1776271164$gmane$org@obiwan.sandelman.ca>

Ondřej Surý <[email protected]> wrote:
    >> Are there any warnings that can be enabled?
    >> I think, one wouldn't want this on by default.

    > What warnings do you have in mind?

For the parent+child both loaded, then it might be nice to be able to know
when they do not match.  This perhaps matters more to secondaries.

    > Like https://zonemaster.net/en/ (it also has a command line utility)

    >> How does bind9 set it's default cache size?  Is it related to available
    >> physical (not virtual) memory?

    > Yes, it is actually documented:
    > https://bind9.readthedocs.io/en/v9.21.21/reference.html#namedconf-statement-max-cache-size

"in bytes or percentage of total physical memory"
which answers my question, and that page nicely tells us the default.

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