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Add iptables rules via a systemd transient unit to drop traffic addressed to the bridge gateway IP from non-bridge interfaces. The firewall manager waits for the transient unit to complete and verifies success via D-Bus property change signals. On failure, the system is marked unhealthy and host-network add-ons are prevented from booting. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>