[Ntop] NetFlow / local interface monitoring

[os10rules at gmail.com]

I Googled and read the Wikis and I can't find the answer to this. Pardon my question. I installed ntop and used it for monitoring traffic on my wireless card. Now I want to use it for Netflow/Traffic Flow coming from a Mikrotik router. How do I prevent ntop from sniffing the traffic on the local internface and only pay attention to the NetFlow/Traffic Flow data coming from the router? Thanks!

Greg