Bug#1127599: Acknowledgement (linux-image-6.12.69+deb13-amd64: gre6 tunnels no longer work after upgrading to linux-image-6.12.69+deb13-amd64)

[Tobias Fiebig]

I just downgraded the affected hosts to 6.12.63+deb13-amd64; This
restores gre6 functionality.