Instead of /etc/ethers and /etc/inet/hosts use (3)

DHCP:
1) client identification (pntadm -M 192.168.2.7 -i 010002B33E68AC 192.168.2.0)
* note 01 before client MAC address
2) flags to Reserved(03)= Permanent(01)+Manual(02) (pntadm -M 192.168.2.7 -f 03 192.168.2.0)
3) assign SUNW.i86pc macro (pntadm -M 192.168.2.7 -m SUNW.i86pc 192.168.2.0)