Werk #19061: DNS cache: Prevent superfluous queries

Component

Core & setup

Title

DNS cache: Prevent superfluous queries

Date

Jan 2, 2026

Level

Prominent Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.4.0p19 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)
2.3.0p42 Not yet released	Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

While updating the DNS cache, Checkmk performed DNS queries also for hosts with statically configured IP addresses. This was caused by an erroneous swap of dictionaries containing the configured IPv4 and IPv6 addresses in the call stack.

This werk removes the swap such that no DNS query is executed for hosts with a configured IP address.

To benefit from this fix, no manual interaction is required.

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