ntopng: no alert threshold definition for hosts with private ip

hi,

i would like to define a threshold for flows which triggers an alert for
a host with a private ip. when i go to 'host details' and then to
'alerts' i see the list of 'flow alerts' and the buttons 'every minute',
'every 5 minutes', ....
clicking on one of the buttons for a host with a private ip i receive
the message from ntopng: No recorded alerts for interface *
if the host is flagged as 'local host' and has not a private ip i can
define thresholds for the host (example is attached).

is there a reason why i cannot define thresholds for hosts with a
private ip or is it a feature of my setup ?

i'm using ntopng Enterprise Edition v.3.1.170907

many thanks in advance!

best,
	rocco

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