Next Hop or user IP collecting?

Hi,

I use only 2 days of your NFA 4, it's a great program, but i don't see the most importand data : our users net usage.
My cisco router is 1841, with 1 internal interface and 2 dialer interface (ADSL).
If i see the verbose data flow in router, it's contain the internal address as next hop data. So NFA collect data only my router outside datacount, not next hop or internal addresses. How can i configure NFA to collect NextHop data?

THX : Libus

SrcIf SrcIPaddress DstIf DstIPaddress Pr TOS Flgs Pkts
Port Msk AS Port Msk AS NextHop B/Pk Active
Vi1 216.155.200.70 Fa0/0 xx.xx.xx.25 06 00 12 10
0050 /0 0 04D6 /24 0 192.168.1.61 1176 0.6