Setting it from post-oobe.cmd could never have worked, and the reason is worth
writing down. Without delayOobeRun, OOBE runs inside the build VM -- whose NIC
is qemu user networking, on a different subnet, with a different MAC. The
address was being applied to an adapter that does not exist on the real host.
Windows then meets the target's NIC as new hardware and defaults to DHCP.
RDP came through the same script unharmed because its settings are
registry-wide rather than per-adapter, which is why one worked and the other
did not despite sitting a few lines apart.
So the script is now registered as an onstart scheduled task running as SYSTEM.
It was already idempotent, and per-boot also survives the adapter being
replaced again later.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0117qMyjpuXsjpVAcpJbFD8g
6a62a649bd