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Stefan Agner
927f85a8cf
Restores IPv6 forwarding that was dropped in d918dace. With ipv6=true,
dockerd enables net.ipv6.conf.all.forwarding at startup (and sets the
IPv6 FORWARD chain policy to DROP), matching IPv4 behavior. Fixes the
regression worked around in supervisor#6720 (issue #4630).
Note: Supervisor since
https://github.com/home-assistant/supervisor/pull/6720 (shipped with
Supervisor 2026.04.0) already enables IPv6 explicitly on the hassio
bridge by default, so this OS-level change is not strictly required to
restore IPv6 forwarding. It is still the right thing to do - letting
Docker take control of IPv6 forwarding (just like IPv4) is what the
original commit intended, and it ensures correct behavior independent
of Supervisor's defaults.