If you are using the all-in-one server, you don't have to create a new unit,
because the first unit is already predefined. If you want to use more
servers with the collectors, you first need to create new units, one unit
for one server. The unit identification number (unit ID) is very important.
This number must correspond with "unit_id" value in the configuration file
of the NetFlow collector (/etc/netflow/nfcd.conf
).