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v1.18 Backports 2026-01-19#43865

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giorio94 merged 2 commits intov1.18from
pr/v1.18-backport-2026-01-19-09-41
Jan 20, 2026
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v1.18 Backports 2026-01-19#43865
giorio94 merged 2 commits intov1.18from
pr/v1.18-backport-2026-01-19-09-41

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@giorio94 giorio94 commented Jan 19, 2026

PRs skipped due to conflicts:

Once this PR is merged, a GitHub action will update the labels of these PRs:

 40859 43691

ldelossa and others added 2 commits January 19, 2026 09:41
[ upstream commit 90725f7 ]

The following commit removed the unused node config definition
`MCAST_GROUP_OUTER_V4_MAP`.

commit cce6a96
Author: Timo Beckers <timo@isovalent.com>
Date:   Thu Feb 6 15:42:49 2025 +0100

    multicast: remove unused MCAST_GROUP_OUTER_V4_MAP node define

However, the actual NodeDefines map was not initialized.

Ensure the defines.Map is initialized when enabling multicast.

Signed-off-by: Louis DeLosSantos <louis.delos@isovalent.com>
Signed-off-by: Marco Iorio <marco.iorio@isovalent.com>
[ upstream commit bf0dca5 ]

[ backporter's notes: it looks like that the gke-create-esp-rule action
  did not exist in v1.18. Hence, I've applied the same changes directly
  to the corresponding step of the Conformance GKE workflow. ]

Previously, ESP rule was too broad and automation was deleting firewall
rule. Let's switch to only allowing ESP traffic between nodes.

Signed-off-by: Marcel Zieba <marcel.zieba@isovalent.com>
Signed-off-by: Marco Iorio <marco.iorio@isovalent.com>
@giorio94 giorio94 added kind/backports This PR provides functionality previously merged into master. backport/1.18 This PR represents a backport for Cilium 1.18.x of a PR that was merged to main. labels Jan 19, 2026
@giorio94 giorio94 requested review from ldelossa and marseel January 19, 2026 08:54
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/ci-gke

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/test

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The Conformance GKE workflow looks in a bad shape, but the same also applies on main (e.g., latest scheduled run), so I assume it being unrelated to this specific changes. Marking ready for review.

@julianwiedmann julianwiedmann linked an issue Jan 20, 2026 that may be closed by this pull request
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@giorio94 giorio94 added this pull request to the merge queue Jan 20, 2026
Merged via the queue into v1.18 with commit cb7fd39 Jan 20, 2026
332 of 340 checks passed
@giorio94 giorio94 deleted the pr/v1.18-backport-2026-01-19-09-41 branch January 20, 2026 13:23
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LGTM for @cilium/github-sec

@maintainer-s-little-helper maintainer-s-little-helper bot added the ready-to-merge This PR has passed all tests and received consensus from code owners to merge. label Jan 20, 2026
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backport/1.18 This PR represents a backport for Cilium 1.18.x of a PR that was merged to main. kind/backports This PR provides functionality previously merged into master. ready-to-merge This PR has passed all tests and received consensus from code owners to merge.

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Multicast broken in v1.18.x versions

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