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fix: doc: Expand blackhole description

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Clarify the behavior of negated addresses within the `blackhole`
statement to prevent common configuration misunderstandings.

Closes #5733

Merge branch '5733-expand-blackhole-description' into 'main'

See merge request isc-projects/bind9!11541
This commit is contained in:
Mark Andrews 2026-03-12 12:08:34 +11:00
commit 98267f4a7a
1 changed files with 12 additions and 0 deletions
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doc/arm/reference.rst
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@ -3069,6 +3069,18 @@ for details on how to specify IP address lists.
from or or cannot use to resolve a query. Queries from these addresses are not
responded to. The default is ``none``.
When configuring this list, note that BIND evaluates Access Control Lists
sequentially (first match wins). A common misconception is that the directive
``!address;`` blocks everything except that address. In reality, it only
explicitly exempts ``address`` from the blackhole; all other IP addresses
reach the end of the list without matching, meaning they are also not
blackholed.
To successfully blackhole all traffic *except* specific addresses, you must
explicitly catch the remaining traffic with ``any;`` at the end of the list.
For example: ``!address; any;``
.. namedconf:statement:: no-case-compress
:tags: server
:short: Specifies a list of addresses that require case-insensitive compression in responses.