• The iPXE boot loader doesn’t seems to support booting from a 4k-sectorsize iSCSI target (keep it to 512-byte to be on the safe side)

dhcp-match=set:ipxe,175 # iPXE sends a 175 option.

dhcp-option=encap:175, 188, "\\efi\\debian\\grubx64.efi"
dhcp-option=option:root-path, iscsi:192.168.100.1:::0:iqn.1999-09.com.example:diskless-debian