ClientHardwareAddress is an attribute in the incoming address which contains the hex encoded MAC address of the client. If present, it will be used as CHADDR in the DHCP request. If not present, and fake CHADDR based on the request XID will be used. The DHCP server may use this when allocating an address for the client. The MAC address can contain extraneous characters such as ‘.’ or ‘:’ as long as it contains the 12 hex characters (case insensitive) of the MAC address. Special characters are permitted.

# Use contents of an attribute to tell the DHCP server the
# hardware address of the client
ClientHardwareAddress %{Unisphere-Dhcp-Mac-Addr}