Werk #16469: MTR agent bakery rule: allow IPv6 addresses as destination

Component	Agent bakery
Title	MTR agent bakery rule: allow IPv6 addresses as destination
Date	Aug 19, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	3.0.0b1 Not yet released Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.5.0p13 Not yet released Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.4.0p36 Checkmk Pro, Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT 2.3.0p50 Not yet released Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p39 Checkmk Pro, Checkmk Ultimate MT

The agent bakery ruleset "MTR (Matt's traceroute) (Linux)" rejected any Destination address containing a colon, so an IPv6 address could not be configured - even though the same rule offers an "Enforce IPv4 / IPv6" option and the agent plugin handles IPv6 destinations without problems.

Colons are now accepted. The character is not part of the characters Checkmk forbids in service names, so it can safely be used.

IPv6 zone identifiers (for example fe80::1%eth0) remain unsupported: the Nagios core strips % from service names, which would make the service name differ from the discovered item.

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