[Ntop] NetFlow Question

[Andre Dieball]

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Hi there
 
sorry for the newbie question, but what exactly and where should I get Netflow 
information If I've configured netflow correctly?
 
I configured the plugin, my machine is listening on port 2055 and I configured the 
router to export netflow V5 statistics to the configured IP address.
 
I don't quite understand the "vertual interface" settings in the netflow configuration 
page.
 
Thanks a lot in advance.
 
Rgds
   Andre