If this feature is enabled then DHCP packets both
ucast and bcast with UDP destination port 68 will be
intercepted. DHCP packets with the router option in
the options field in the DHCP message will be
modified so that the first daddress in the router
option is the same as the clients address. Thus the
client will be its own default gateway. If this
feature is disabled DHCP packtes will be forwarded as
usual.