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665093343c
When setup-ovn.sh migrates the WAN IP from a physical NIC to br-external, systemd-resolved loses its DNS association (DNS servers are per-interface). This breaks hostname resolution for everything on the host — git, apt, curl, SSH all fail. Now captures DNS config from the original interface before migration and re-associates it with br-external via resolvectl. Falls back to 8.8.8.8 if no DNS was configured on the original interface.