Werk #19360: Fix LLDP cache crash on IPv4 address reported as IPv6

Component

Checks & agents

Title

Fix LLDP cache crash on IPv4 address reported as IPv6

Date

Mar 23, 2026

Level

Trivial Change

Class

Bug Fix

Compatibility

Compatible - no manual interaction needed

Checkmk versions & editions

2.6.0b1 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT
2.5.0b2 Not yet released	Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Previously, the LLDP cache section parser crashed with a ValueError when a network device reported an IPv4 management address using LLDP address family 2 (IPv6). This could happen with certain devices (e.g. ZyXEL GS1900 switches) that incorrectly encode the address family. The parser now detects the byte count mismatch and renders the address as IPv4 instead.

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