config 'defaults' 'defaults'
    # no is the numer of the interface, starting from 0
	# check /etc/init.d/on_config for usage
	# on_id_1 is the upper part, on_id_2 the lower part of the opennet id
    option 'free_ipschema'        '"10.3."$((no*10+on_id_1))"."$on_id_2'
    option 'free_netmask'         '255.255.0.0'
