"Tried" to setup a PXE iSCSI boot enviroment.
But somehow the iPXE failed to connect to the synology iSCSI target when using Thick provisioning. With thin provisioning, iPXE can connect, but then before the system start loading, it quickly disconnected.
And the nic support is not that good. It can drive the built-in 2.5G nic, but only with 10Mbps. So loading a windows installing iso (~6GB) would take infinite long.
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On a second thought, installing a windows copy to the local storage is not that bad. Why I want to use diskless boot up in the first place?