Werk #19935: Dual-stack clusters: no false warning about different address families

Component

Core & setup

Title

Dual-stack clusters: no false warning about different address families

Date

Sep 29, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

3.0.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT
2.5.0p16 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

Since Checkmk 2.5, activating changes warned about every cluster that is configured as IPv4/IPv6 dual-stack together with its nodes, for example:

Cluster 'cluster' has different primary address families: cluster: IPv4, node1: DUAL_STACK, node2: DUAL_STACK

The cluster and its nodes use the same primary address family, so the warning was wrong. It now only appears when the primary address families actually differ, or when a node has no IP address.

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