The value of vRtrIfDHCPUseArpForReply specifies, how the
system determines the Hw address for outgoing IP packets.
If set to 'false', the DHCP CHADDR (Client Hardware Address)
is used. If set to 'true' the CHADDR is ignored, and ARP is used to
determine the Hw address.
Is set to TRUE, the system will accept all DHCP messages with
CHADDR set to 00:00:00:00:00:00.
This option only has effect on ethernet interfaces.