about installing ntop



hi,
i have installed ntop .

apt-get instal ntop .

and I do not edit any file manually .

my network

192.168.10.x
||||||||
(switch) --- Ntop server 192.168.10.8:3000
|
(Router-192.168.10.1)

It seems that ntop is not shows data properly .
Some one gives download but it does not shows that it consumes
bandwidth !!!!
Do I need to adit any file to fit it my network ???

.